Carrier Air Conditioner Users Manual

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30GTN,GTR040-420
30GUN,GUR040-420
Air-Cooled Reciprocating Liquid Chillers

with ComfortLink™ Controls
50/60 Hz

Controls Start-Up, Operation,
Service, and Troubleshooting
SAFETY CONSIDERATIONS
Installing, starting up, and servicing this equipment can be
hazardous due to system pressures, electrical components, and
equipment location (roof, elevated structures, etc.). Only
trained, qualified installers and service mechanics should install, start up, and service this equipment.
When working on this equipment, observe precautions in
the literature, and on tags, stickers, and labels attached to the
equipment, and any other safety precautions that apply. Follow
all safety codes. Wear safety glasses and work gloves. Use care
in handling, rigging, and setting this equipment, and in handling all electrical components.

Electrical shock can cause personal injury and death. Shut
off all power to this equipment during installation and service. There may be more than one disconnect switch. Tag
all disconnect locations to alert others not to restore power
until work is completed.

This unit uses a microprocessor-based electronic control
system. Do not use jumpers or other tools to short out components, or to bypass or otherwise depart from recommended procedures. Any short-to-ground of the control
board or accompanying wiring may destroy the electronic
modules or electrical components.

To prevent potential damage to heat exchanger tubes
always run fluid through heat exchangers when adding or
removing refrigerant charge. Use appropriate brine solutions in cooler fluid loops to prevent the freezing of heat
exchangers when the equipment is exposed to temperatures
below 32 F (0° C).
DO NOT VENT refrigerant relief valves within a building.
Outlet from relief valves must be vented outdoors in accordance with the latest edition of ANSI/ASHRAE (American
National Standards Institute/American Society of Heating,
Refrigeration and Air Conditioning Engineers) 15 (Safety
Code for Mechanical Refrigeration). The accumulation of
refrigerant in an enclosed space can displace oxygen and
cause asphyxiation. Provide adequate ventilation in
enclosed or low overhead areas. Inhalation of high concentrations of vapor is harmful and may cause heart irregularities, unconsciousness or death. Misuse can be fatal. Vapor
is heavier than air and reduces the amount of oxygen available for breathing. Product causes eye and skin irritation.
Decomposition products are hazardous.

DO NOT attempt to unbraze factory joints when servicing
this equipment. Compressor oil is flammable and there is
no way to detect how much oil may be in any of the refrigerant lines. Cut lines with a tubing cutter as required when
performing service. Use a pan to catch any oil that may
come out of the lines and as a gage for how much oil to add
to system. DO NOT re-use compressor oil.

CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2,3
MAJOR SYSTEM COMPONENTS . . . . . . . . . . . . . . 3-10
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Main Base Board (MBB) . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Expansion Valve (EXV) Board . . . . . . . . . . . . . . . . . . . . 3
Compressor Expansion Board (CXB). . . . . . . . . . . . . 3
Scrolling Marquee Display . . . . . . . . . . . . . . . . . . . . . . . 3
Energy Management Module (EMM) . . . . . . . . . . . . . . 3
Enable/Off/Remote Contact Switch. . . . . . . . . . . . . . . 3
Emergency On/Off Switch . . . . . . . . . . . . . . . . . . . . . . . . 3
Reset Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Board Addresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Control Module Communication. . . . . . . . . . . . . . . . . . 4
Carrier Comfort Network Interface . . . . . . . . . . . . . . . 4
OPERATING DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-47
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
• T1 — COOLER LEAVING FLUID SENSOR
• T2 — COOLER ENTERING FLUID SENSOR
• T3,T4 — SATURATED CONDENSING
TEMPERATURE SENSORS
• T5,T6 — COOLER SUCTION TEMPERATURE
SENSORS
• T7,T8 — COMPRESSOR SUCTION GAS
TEMPERATURE SENSORS
• T9 — OUTDOOR-AIR TEMPERATURE SENSOR
• T10 — REMOTE SPACE TEMPERATURE SENSOR
Thermostatic Expansion Valves (TXV). . . . . . . . . . . 15
Compressor Protection Control System
(CPCS) or Control Relay (CR) . . . . . . . . . . . . . . . . . 15
Compressor Ground Current Protection Board
(CGF) and Control Relay (CR) . . . . . . . . . . . . . . . . . 15
Electronic Expansion Valve (EXV) . . . . . . . . . . . . . . . 16
Energy Management Module . . . . . . . . . . . . . . . . . . . . 16
Capacity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
• ADDING ADDITIONAL UNLOADERS
• MINUTES LEFT FOR START
• MINUTES OFF TIME
• LOADING SEQUENCE

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 903
Catalog No. 563-025
Printed in U.S.A.
Form 30GTN-3T
Pg 1
3-00
Replaces: 30GTN-2T
Book 2
Tab 5c

CONTENTS (cont)

Page
Safety Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
• COMPRESSOR PROTECTION
• LOW OIL PRESSURE PROTECTION
• CRANKCASE HEATERS
• COOLER PROTECTION
Relief Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
• HIGH-SIDE PROTECTION
• LOW-SIDE PROTECTION
• PRESSURE RELIEF VALVES
Other Safeties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
START-UP AND OPERATION. . . . . . . . . . . . . . . . . . 66,67
Actual Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Operating Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
• TEMPERATURES
• VOLTAGE
• MINIMUM FLUID LOOP VOLUME
• FLOW RATE REQUIREMENTS
Operation Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Refrigerant Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
FIELD WIRING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67-70
APPENDIX A — CCN TABLES . . . . . . . . . . . . . . . . 71-79
APPENDIX B — FLUID PRESSURE DROP
CURVES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80-87
START-UP CHECKLIST . . . . . . . . . . . . . . . . .CL-1 to CL-8

Page
• LEAD/LAG DETERMINATION
• CAPACITY SEQUENCE DETERMINATION
• CAPACITY CONTROL OVERRIDES
Head Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . . 27
• COMFORTLINK™ UNITS (With EXV)
• UNITS WITH TXV
Pumpout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
• EXV UNITS
• TXV UNITS
Marquee Display Usage . . . . . . . . . . . . . . . . . . . . . . . . . 29
Service Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Configuring and Operating Dual Chiller
Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Temperature Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Cooling Set Point (4 to 20 mA). . . . . . . . . . . . . . . . . . . 45
Demand Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
• DEMAND LIMIT (2-Stage Switch Controlled)
• EXTERNALLY POWERED DEMAND LIMIT
(4 to 20 mA Controlled)
• DEMAND LIMIT (CCN Loadshed Controlled)
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 47-52
Compressor Protection Control System
(CPCS) Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Compressor Ground Current (CGF) Board
(30GTN,R and 30GUN,R130-210, 230A-315A,
and 330A/B-420A/B) . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
EXV Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
• STEP 1 — CHECK PROCESSOR EXV OUTPUTS
• STEP 2 — CHECK EXV WIRING
• STEP 3 — CHECK RESISTANCE OF EXV MOTOR
WINDINGS
• STEP 4 — CHECK THERMISTORS THAT
CONTROL EXV
• STEP 5 — CHECK OPERATION OF THE EXV
Alarms and Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53-65
Electronic Components . . . . . . . . . . . . . . . . . . . . . . . . . 53
Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
• COMPRESSOR REMOVAL
• OIL CHARGE
Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
• COOLER REMOVAL
• REPLACING COOLER
• SERVICING THE COOLER
Condenser Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Condenser Fans. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Refrigerant Feed Components. . . . . . . . . . . . . . . . . . . 58
• ELECTRONIC EXPANSION VALVE (EXV)
• MOISTURE-LIQUID INDICATOR
• FILTER DRIER
• LIQUID LINE SOLENOID VALVE
• LIQUID LINE SERVICE VALVE
Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
• LOCATION
• REPLACING THERMISTOR T2
• REPLACING THERMISTORS T1,T5,T6,T7, AND T8
• THERMISTORS T3 AND T4
• THERMISTOR/TEMPERATURE SENSOR CHECK

GENERAL
The model 30GTN,R chillers are air-cooled chillers utilizing refrigerant R-22. The model 30GUN,R chillers are aircooled chillers utilizing refrigerant R-134a.
Unit sizes 230-420 are modular units which are shipped as
separate sections (modules A and B). Installation instructions
specific to these units are shipped inside the individual modules. See Tables 1A and 1B for a listing of unit sizes and modular combinations. For modules 230B-315B, follow all general
instructions as noted for unit sizes 080-110. For all remaining
modules, follow instructions for unit sizes 130-210.

INTRODUCTION
This publication contains Start-Up, Service, Controls, Operation, and Troubleshooting information for the 30GTN,R040420 and 30GUN,R040-420 liquid chillers with ComfortLink
controls.
The 30GTN,R and 30GUN,R040-420 chillers are equipped
with electronic expansion valves (EXVs) or, on size 040-110
FIOP (factory-installed option) units, conventional thermostatic expansion valves (TXVs). The size 040-110 FIOP chillers
are also equipped with liquid line solenoid valves (LLSV).
NOTE: TXVs are not available on modular units.
Differences in operations and controls between standard
and 040-110 FIOP units are noted in appropriate sections in
this publication. Refer to the Installation Instructions and the
Wiring Diagrams for the appropriate unit for further details.

2

Table 1A — Unit Sizes and Modular Combinations
(30GTN,R)
UNIT
30GTN,R
040

045
050
060
070
080
090
100
110
130
150
170
190
210
230
245
255
270
290
315
330
360
390
420

NOMINAL
TONS
40
45
50
60
70
80
90
100
110
125
145
160
180
200
220
230
240
260
280
300
325
350
380
400

SECTION A
UNIT 30GTN,R
—
—
—
—
—
—
—
—
—
—
—
—
—
—
150
150
150
170
190
210
170
190
210
210

inputs from compressors A1, A2, B1 and B2, and other status
switches. See Table 3. The MBB also controls several outputs.
Relay outputs controlled by the MBB are shown in Table 4.
Information is transmitted between modules via a 3-wire communication bus or LEN (Local Equipment Network). The
CCN (Carrier Comfort Network) bus is also supported. Connections to both LEN and CCN buses are made at TB3. See
Fig. 5.

SECTION B
UNIT 30GTN,R
—
—
—
—
—
—
—
—
—
—
—
—
—
—
080
090
100
100
110
110
170
190/170*
190
210

Expansion Valve (EXV) Board — The electronic expansion valve (EXV) board receives inputs from thermistors
T7 and T8. See Table 2. The EXV board communicates with
the MBB and directly controls the expansion valves to maintain the correct compressor superheat.

Compressor Expansion Board (CXB) — The
CXB is included as standard on sizes 150-210 (60 Hz) and 130
(50 Hz) and associated modular units. The compressor expansion board (CXB) receives the feedback inputs from compressors A3, B3 and A4. See Table 3. The CXB board communicates the status to the MBB and controls the outputs for these
compressors. An additional CXB is required for unit sizes 040110, 130 (60 Hz), 230B-315B with additional unloaders.
Scrolling Marquee Display — This device is the keypad interface used for accessing chiller information, reading
sensor values, and testing the chiller. The marquee display is a
4-key, 4-character, 16-segment LED (light-emitting diode) display. Eleven mode LEDs are located on the display as well as
an Alarm Status LED. See Marquee Display Usage section on
page 29 for further details.

*60 Hz units/50 Hz units.

Table 1B — Unit Sizes and Modular Combinations
(30GUN,R)
UNIT
30GUN,R
040
045
050
060
070
080
090
100
110
130
150
170
190
210
230
245
255
270
290
315
330
360
390
420

NOMINAL
TONS
26
28
34
42
48
55
59
66
72
84
99
110
122
134
154
158
165
176
193
206
219
243
256
268

SECTION A
UNIT 30GUN,R
—
—
—
—
—
—
—
—
—
—
—
—
—
—
150
150
150
170
190
210
170
190
210
210

SECTION B
UNIT 30GUN,R
—
—
—
—
—
—
—
—
—
—
—
—
—
—
080
090
100
100
110
110
170
190/170*
190
210

Energy Management Module (EMM) — The
EMM module is available as a factory-installed option or as a
field-installed accessory. The EMM module receives 4 to
20 mA inputs for the temperature reset, cooling set point reset
and demand limit functions. The EMM module also receives
the switch inputs for the field-installed 2-stage demand limit
and ice done functions. The EMM module communicates the
status of all inputs with the MBB, and the MBB adjusts the
control point, capacity limit, and other functions according to
the inputs received.

Enable/Off/Remote Contact Switch

— The
Enable/Off/Remote Contact switch is a 3-position switch used
to control the chiller. When switched to the Enable position the
chiller is under its own control. Move the switch to the Off position to shut the chiller down. Move the switch to the Remote
Contact position and a field installed dry contact can be used to
start the chiller. The contacts must be rated for dry circuit application capable of handling a 24 vac load. In the Enable and Remote Contact (dry contacts closed) positions, the chiller is allowed to operate and respond to the scheduling configuration,
CCN configuration and set point data. See Fig. 6.

Emergency On/Off Switch — The Emergency On/
Off switch should only be used when it is required to shut the
chiller off immediately. Power to the MBB, EMM, CXB, and
marquee display is interrupted when this switch is off and all
outputs from these modules will be turned off. The EXV board
is powered separately, but expansion valves will be closed as a
result of the loss of communication with the MBB. There is no
pumpout cycle when this switch is used. See Fig. 6.

*60 Hz units/50 Hz units.

MAJOR SYSTEM COMPONENTS
General — The 30GTN,R and 30GUN,R air-cooled reciprocating chillers contain the ComfortLink™ electronic control
system that controls and monitors all operations of the chiller.
The control system is composed of several components as
listed in the sections below. See Fig. 1 for typical control box
drawing. See Fig. 2-4 for control schematics.

Reset Button — A reset button is located on the fuse/
circuit breaker panel for unit sizes 130-210 and associated
modules. The reset button must be pressed to reset either
Circuit Ground Fault board in the event of a trip.

Main Base Board (MBB) — See Fig. 5. The MBB is
the heart of the ComfortLink control system. It contains the
major portion of operating software and controls the operation
of the machine. The MBB continuously monitors input/output
channel information received from its inputs and from all other
modules. The MBB receives inputs from thermistors T1-T6,
T9, and T10. See Table 2. The MBB also receives the feedback

Board Addresses — The Main Base Board (MBB) has
a 3-position Instance jumper that must be set to ‘1.’ All other
boards have 4-position DIP switches. All switches are set to
‘On’ for all boards.

3

Control Module Communication

At each system element, the shields of its communication
bus cables must be tied together. If the communication bus is
entirely within one building, the resulting continuous shield
must be connected to a ground at one point only. If the communication bus cable exits from one building and enters another,
the shields must be connected to grounds at the lightning suppressor in each building where the cable enters or exits the
building (one point per building only). To connect the unit to
the network:
1. Turn off power to the control box.
2. Cut the CCN wire and strip the ends of the red (+), white
(ground), and black (–) conductors. (Substitute appropriate colors for different colored cables.)
3. Connect the red wire to (+) terminal on TB3 of the plug,
the white wire to COM terminal, and the black wire to the
(–) terminal.
4. The RJ14 CCN connector on TB3 can also be used, but is
only intended for temporary connection (for example, a
laptop computer running Service Tool).

RED LED — Proper operation of the control boards can be
visually checked by looking at the red status LEDs (lightemitting diodes). When operating correctly, the red status
LEDs should be blinking in unison at a rate of once every
2 seconds. If the red LEDs are not blinking in unison, verify
that correct power is being supplied to all modules. Be sure that
the Main Base Board (MBB) is supplied with the current software. If necessary, reload current software. If the problem still
persists, replace the MBB. A red LED that is lit continuously or
blinking at a rate of once per second or faster indicates that the
board should be replaced.
GREEN LED — The MBB has one green LED. The Local
Equipment Network (LEN) LED should always be blinking
whenever power is on. All other boards have a LEN LED
which should be blinking whenever power is on. Check LEN
connections for potential communication errors at the board J3
and/or J4 connectors. Communication between modules is accomplished by a 3-wire sensor bus. These 3 wires run in parallel from module to module. The J4 connector on the MBB provides both power and communication directly to the marquee
display only.
YELLOW LED — The MBB has one yellow LED. The
Carrier Comfort Network (CCN) LED will blink during times
of network communication.

IMPORTANT: A shorted CCN bus cable will prevent
some routines from running and may prevent the unit
from starting. If abnormal conditions occur, unplug the
connector. If conditions return to normal, check the
CCN connector and cable. Run new cable if necessary.
A short in one section of the bus can cause problems
with all system elements on the bus.

Carrier Comfort Network (CCN) Interface —
The 30GTN,R chiller units can be connected to the CCN if
desired. The communication bus wiring is a shielded,
3-conductor cable with drain wire and is supplied and installed
in the field. The system elements are connected to the communication bus in a daisy chain arrangement. The positive pin of
each system element communication connector must be wired
to the positive pins of the system elements on either side of it.
This is also required for the negative and signal ground pins of
each system element. Wiring connections for CCN should be
made at TB3. Consult the CCN Contractor’s Manual for further information.
NOTE: Conductors and drain wire must be 20 AWG (American Wire Gage) minimum stranded, tinned copper. Individual
conductors must be insulated with PVC, PVC/nylon, vinyl,
Teflon, or polyethylene. An aluminum/polyester 100% foil
shield and an outer jacket of PVC, PVC/nylon, chrome vinyl,
or Teflon with a minimum operating temperature range of
–20 C to 60 C is required. Wire manufactured by Alpha (2413
or 5463), American (A22503), Belden (8772), or Columbia
(02525) meets the above mentioned requirements.
It is important when connecting to a CCN communication
bus that a color coding scheme be used for the entire network
to simplify the installation. It is recommended that red be used
for the signal positive, black for the signal negative, and white
for the signal ground. Use a similar scheme for cables containing different colored wires.

Table 2 — Thermistor Designations
THERMISTOR
NO.
T1
T2
T3
T4
T5
T6
T7
T8

PIN
CONNECTION
POINT
J8-13,14 (MBB)
J8-11,12 (MBB)
J8-21,22 (MBB)
J8-15,16 (MBB)
J8-24,25 (MBB)
J8-18,19 (MBB)
J5-11,12 (EXV)
J5-9,10 (EXV)
J8-7,8 (MBB)

T9
T10

J8-5,6 (MBB)

LEGEND
EXV — Electronic Expansion Valve
MBB — Main Base Board

4

THERMISTOR INPUT
Cooler Leaving Fluid
Cooler Entering Fluid
Saturated Condensing
Temperature, Ckt A
Saturated Condensing
Temperature, Ckt B
Cooler Suction Temperature,
Ckt A (EXV Only)
Cooler Suction Temperature,
Ckt B (EXV Only)
Compressor Suction Gas
Temperature, Ckt A (EXV Only)
Compressor Suction Gas
Temperature, Ckt B (EXV Only)
Outdoor-Air Temperature
Sensor or Dual Chiller LWT
Sensors (Accessory)
Remote Space Temperature
Sensor (Accessory)

Table 3 — Status Switches
STATUS SWITCH
Oil Pressure, Ckt B
Oil Pressure, Ckt A
Remote On/Off
Compressor Fault
Signal, B3
Compressor Fault
Signal, B2
Compressor Fault
Signal, B1
Compressor Fault
Signal, A4
Compressor Fault
Signal, A3
Compressor Fault
Signal, A2
Compressor Fault
Signal, A1
CPCS
CR
CXB
MBB
OPS

—
—
—
—
—

PIN
CONNECTION
POINT

070
(50 Hz)
080, 230B

J7-1, 2 (MBB)
J7-3, 4 (MBB)
TB5-13, 14

Not Used*
Not Used*

OPSB
OPSA

J5-8, 12 (CXB)

Not Used

Not Used

Not Used

Not Used

Not Used

CR-B3

CR-B3

J9-2, 12 (MBB)

Not Used

Not Used

CPCS-B2

CR-B2

CR-B2

CR-B2

CR-B2

J9-8, 12 (MBB)

CR/CPCS-B1†

CPCS-B1

CPCS-B1

CR-B1

CR-B1

CR-B1

CR-B1

J5-5, 12 (CXB)

Not Used

Not Used

Not Used

Not Used

Not Used

Not Used

CR-A4

J5-11, 12 (CXB)

Not Used

Not Used

Not Used

Not Used

CR-A3

CR-A3

CR-A3

J9-5, 12 (MBB)

Not Used

CPCS-A2

CPCS-A2

CR-A2

CR-A2

CR-A2

CR-A2

J9-11, 12 (MBB)

CR/CPCS-A1†

CPCS-A1

CPCS-A1

CR-A1

CR-A1

CR-A1

CR-A1

090-110,
245B-315B

130
(60 Hz)

OPSB
OPSB
OPSB
OPSA
OPSA
OPSA
Field-Installed Relay Closure

LEGEND
Compressor Protection Control System
Control Relay
Compressor Expansion Board
Main Base Board
Oil Pressure Switch, Circuit A or B

K1(MBB)

K2 (MBB)
K3 (MBB)
K4 (MBB)
K5 (MBB)
K6 (MBB)
K7 (MBB)
K8 (MBB)

K9 (MBB)

K10 (MBB)

K11 (MBB)
K1 (CXB)
K2 (CXB)
K3 (CXB)
K4 (CXB)
K5 (CXB)
K6 (CXB)

210, 315A,
390A,
420A/B
OPSB
OPSA

*The OPS can also be added as an accessory.
†The CPCS can be added as an accessory.

LEGEND FOR FIG. 1-4

Table 4 — Output Relay
RELAY
NO.

130 (50 Hz)
150, 230A255A

170,190,
270A,290A,
330A/B,
360A/B, 390B
OPSB
OPSA

040-060 (50 Hz)
040-070 (60 Hz)

C
CB
CCN
CGF
CHT
CKT
CLHR
CPCS
CWFS
CWPI
CR
CXB
EQUIP GND
FB
FC
FCB
FIOP
EMM
EXV
FCB
HPS
LCS
LEN
MBB
NEC
OAT
OPS
PL
PW
SN
SPT
TRAN
SW
TB
TDR
TXV
UL
XL

DESCRIPTION
Energize Compressor A1 and OFM1 (040-110*)
Energize Liquid Line Solenoid Valve for Ckt A (if used)
(040-110*)
Energize Compressor A1, OFM5, and OFM7 (130-210*)
Energize Compressor B1 and OFM2 (040-110*)
Energize Liquid Line Solenoid Valve for Ckt B (if used)
(040-110*)
Energize Compressor B1, OFM6, and OFM8 (130-210*)
Energize Unloader A1 (040-170*)
No Action (190-210*)
Energize Unloader B1 (040-070†, 080-170*)
No Action (190,210*)
No Action (040-060, 50 Hz; 040-070, 60 Hz)
Energize Compressor A2 (070, 50 Hz; 080-210*)
No Action (040-080*)
Energize Compressor B2 (090-210*)
Alarm
Cooler Pump
Energize First Stage of Condenser Fans:
040-050 —OFM3
060-110* — OFM3, OFM4
130 (60 Hz) — OFM1,OFM2
Energize First Stage of Ckt A Condenser Fans:
130 (50 Hz), 150,170* — OFM1
190,210* —OFM1,OFM11
Energize Second Stage of Condenser Fans:
040-050 — OFM4
060-090* — OFM5, OFM6
100,110* — OFM5,OFM6,OFM7,OFM8
130 (60 Hz) — OFM3,OFM4,OFM9,OFM10
Energize First Stage of Ckt B Condenser Fans:
130 (50 Hz), 150,170* — OFM2
190,210* — OFM2,OFM12
Hot Gas Bypass
No Action (040-110*; 130, 60 Hz)
Energize Compressor A3 (130, 50 Hz; 150-210*)
No Action (040-150*)
Energize Compressor B3 (170-210*)
Energize Compressor A4 (210*)
Energize Accessory Unloader A2 (080-110*)
Energize Accessory Unloader B2 (080-110*)
Energize Second Stage of Ckt A Condenser Fans:
130 (50 Hz), 150-210* — OFM3,OFM9
Energize Second Stage of Ckt B Condenser Fans:
130 (50 Hz), 150-210* — OFM4,OFM10

LEGEND
OFM — Outdoor-Fan Motor
*And associated modular units.
†Field-installed accessory unloader.

5

—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

Compressor Contactor
Circuit Breaker
Carrier Comfort Network
Compressor Ground Fault
Cooler Heater Thermostat
Circuit
Cooler Heater Relay
Compressor Protection and Control System
Chilled Water Flow Switch
Chilled Water Pump Interlock
Control Relay
Compressor Expansion Board
Equipment Ground
Fuse Block
Fan Contactor
Fan Circuit Breaker
Factory-Installed Option Package
Energy Management Module
Electronic Expansion Valve
Fan Circuit Breaker
High-Pressure Switch
Loss-of-Charge Switch
Local Equipment Network
Main Base Board
National Electrical Code
Outdoor-Air Temperature
Oil Pressure Switch
Plug
Part Wind
Sensor (Toroid)
Space Temperature
Transformer
Switch
Terminal Block
Time Delay Relay
Thermostatic Expansion Valve
Unloader
Across-the-Line

6
Fig. 1 — Typical Control Box (080-110 and Associated Modular Units Shown)

CCN

LEN
DATA
COMMUNICATION
PORT

Fig. 2 — 24 V Control Schematic, Unit Sizes 040-070
7

CCN

LEN
DATA
COMMUNICATION
PORT

/

Fig. 33 —
— 24
24 V
V Control
Control Schematic,
Schematic, Unit
Unit Sizes
Sizes 080-110,
080-110, 230B-315B
230B-315B
Fig.
8

CCN

LEN
DATA
COMMUNICATION
PORT

Fig. 4 — 24 V Control Schematic, Unit Sizes 130-210, 230A-315A, 330A/B-420A/B

9

RED LED - STATUS

GREEN LED LEN (LOCAL EQUIPMENT NETWORK)

YELLOW LED CCN (CARRIER COMFORT NETWORK)
INSTANCE JUMPER

CEPL130346-01

J1

J4

STATUS

J2

J10

LEN

J3

CCN

J5
J6

J7

J8

J9

Fig. 5 — Main Base Board

EMERGENCY ON/OFF
SWITCH

ENABLE/OFF/REMOTE
CONTACT SWITCH

GFI-CONVENIENCE
OUTLET ACCESSORY
ON 208/230V 460 AND
575V ONLY

RESET BUTTON
(SIZES 130-210 AND
ASSOCIATED MODULES ONLY)

Fig. 6 — Enable/Off/Remote Contact Switch, Emergency On/Off Switch,
and Reset Button Locations

10

OPERATING DATA

T3, T4 — SATURATED CONDENSING TEMPERATURE
SENSORS — These 2 thermistors are clamped to the outside
of a return bend of the condenser coils.
T5, T6 — COOLER SUCTION TEMPERATURE SENSORS — These thermistors are located next to the refrigerant
inlet in the cooler head, and are inserted into a friction-fit well.
The sensor well is located directly in the refrigerant path. These
thermistors are not used on units with TXVs.
T7, T8 — COMPRESSOR SUCTION GAS TEMPERATURE SENSORS — These thermistors are located in the lead
compressor in each circuit in a suction passage after the refrigerant has passed over the motor and is about to enter the cylinders. These thermistors are inserted into friction-fit wells. The
sensor wells are located directly in the refrigerant path. These
thermistors are not used on units with TXVs.
T9 — OUTDOOR-AIR TEMPERATURE SENSOR —
Sensor T9 is an accessory sensor that is remotely mounted and
used for outdoor-air temperature reset.

Sensors — The electronic control uses 4 to 10 thermistors
to sense temperatures for controlling chiller operation. See
Table 2. These sensors are outlined below. See Fig. 7-10 for
thermistor locations. Thermistors T1-T9 are 5 kΩ at 77 F
(25 C). Thermistors T1, T2, T3-T6 and T7-T9 have different
temperature versus resistance and voltage drop performance.
Thermistor T10 is 10 kΩ at 77 F (25 C) and has a different temperature vs resistance and voltage drop performance. See Thermistors section on page 59 for temperature-resistance-voltage
drop characteristics.
T1 — COOLER LEAVING FLUID SENSOR — This thermistor is located in the leaving fluid nozzle. The thermistor
probe is inserted into a friction-fit well.
T2 — COOLER ENTERING FLUID SENSOR — This
thermistor is located in the cooler shell in the first baffle space
in close proximity to the cooler tube bundle.

040-110*

130-210*

1/2 NPT MALE
THREADED ADAPTER

1/2” PVC SHIELD

MIN. 6” OF 22 AWG WIRES
WITH ENDS STRIPPED BACK
.25” ±1/8”

REF.
.83 D
(21.1)
REF.
1.81
(46.0)

3/16” DIA.
THERMOWELL (S.S.)
REF.
5.75
(146.1

AWG
EXV

LEGEND
— American Wire Gage
— Electronic Wire Gage

*And associated modular units.

Fig. 7 — Cooler Thermistor Locations and Accessory Outdoor-Air Temperature Sensor Detail
11

040-070

080-110 AND ASSOCIATED MODULAR UNITS*

130-210 AND ASSOCIATED MODULAR UNITS*

*When thermistor is viewed from perspective where the compressor is on the left and the cooler is on the right.

Fig. 8 — Thermistor T3 and T4 Locations

12

LEGEND
EXV — Electronic Expansion Valve

Fig. 9 — Compressor Thermistor Locations (T7 and T8)

Fig. 10 — Typical Thermistor Location (30GTN,R and 30GUN,R 210, 315A, 390A, 420A/B Shown)

13

2. Insert and secure the red (+) wire to terminal 5 of the
space temperature sensor terminal block.
3. Insert and secure the white (ground) wire to terminal 4 of
the space temperature sensor.
4. Insert and secure the black (–) wire to terminal 2 of the
space temperature sensor.
5. Connect the other end of the communication bus cable to
the remainder of the CCN communication bus.

T10 — REMOTE SPACE TEMPERATURE SENSOR —
Sensor T10 (part no. HH51BX006) is an accessory sensor that
is remotely mounted in the controlled space and used for space
temperature reset. The sensor should be installed as a
wall-mounted thermostat would be (in the conditioned space
where it will not be subjected to either a cooling or heating
source or direct exposure to sunlight, and 4 to 5 ft above the
floor). The push button override button is not supported by the
ComfortLink™ Controls.
Space temperature sensor wires are to be connected to terminals in the unit main control box. The space temperature
sensor includes a terminal block (SEN) and a RJ11 female connector. The RJ11 connector is used to tap into the Carrier Comfort Network (CCN) at the sensor.
To connect the space temperature sensor (Fig. 11):
1. Using a 20 AWG (American Wire Gage) twisted pair
conductor cable rated for the application, connect 1
wire of the twisted pair to one SEN terminal and connect the other wire to the other SEN terminal located
under the cover of the space temperature sensor.
2. Connect the other ends of the wires to terminals 5 and 6
on TB5 located in the unit control box.
Units on the CCN can be monitored from the space at the
sensor through the RJ11 connector, if desired. To wire the RJ11
connector into the CCN (Fig. 12):

SPT (T10) PART NO. HH51BX006

SENSOR
SEN

TB5

SEN

5
6

Fig. 11 — Typical Space Temperature
Sensor Wiring

IMPORTANT: The cable selected for the RJ11 connector wiring MUST be identical to the CCN communication bus wire used for the entire network. Refer to table
below for acceptable wiring.
MANUFACTURER
Alpha
American
Belden
Columbia
Manhattan
Quabik

T-55 SPACE
SENSOR

6

PART NO.
Regular Wiring
Plenum Wiring
1895
—
A21451
A48301
8205
884421
D6451
—
M13402
M64430
6130
—

TO CCN
TERMINALS
ON TB3
AT UNIT

CCN+

5

CCN GND

4
3

CCN-

2
1

1. Cut the CCN wire and strip ends of the red (+), white
(ground), and black (–) conductors. (If another wire
color scheme is used, strip ends of appropriate wires.)

Fig. 12 — CCN Communications Bus Wiring
to Optional Space Sensor RJ11 Connector

14

Thermostatic Expansion Valves (TXV) — Model
30GTN,R and 30GUN,R 040-110 units are available from the
factory with conventional TXVs with liquid line solenoids. The
liquid line solenoid valves are not intended to be a mechanical
shut-off. When service is required, use the liquid line service
valve to pump down the system.
NOTE: This option is not available for modular units.
The TXV is set at the factory to maintain approximately 8 to
12° F (4.4 to 6.7° C) suction superheat leaving the cooler by
metering the proper amount of refrigerant into the cooler. All
TXVs are adjustable, but should not be adjusted unless absolutely necessary. When TXV is used, thermistors T5, T6, T7,
and T8 are not required.
The TXV is designed to limit the cooler saturated suction
temperature to 55 F (12.8 C). This makes it possible for unit to
start at high cooler fluid temperatures without overloading the
compressor.

of any compressor winding exceeds 2.5 amps. If this occurs,
the lead compressor in that circuit is shut down along with other compressors in that circuit.
A high-pressure switch is wired in series between the MBB
and the CR. On compressor A1 and B1 a loss-of-charge switch
is also wired in series with the high-pressure switch. The lead
compressor in each circuit also has the CGF contacts described
above. If any of these switches open during operation of a compressor, the CR relay is deenergized, stopping the compressor
and signaling the processor at the MBB-J9 inputs to lock out
the compressor. If the lead compressor in either circuit is shut
down by high-pressure switch, compressor ground fault, oil
pressure switch, or the loss-of-charge switch, all compressors
in that circuit are also shut down.

Compressor Protection Control System (CPCS
[CPCS — Standard on Sizes 080-110 and
Optional on Sizes 040-070]) or Control Relay
(CR) — 30GTN,R and 30GUN,R 040-110 — Each
compressor has its own CPCS module or CR. See Fig. 13 for
CPCS module. The CPCS or CR is used to control and protect
the compressors and crankcase heaters. The CPCS and CR provide the following functions:
• compressor contactor control/crankcase heater
• crankcase heater control
• compressor ground current protection (CPCS only)
• status communication to processor board
• high-pressure protection
One large relay is located on the CPCS board. This relay
controls the crankcase heater and compressor contactor, and
also provides a set of signal contacts that the microprocessor
monitors to determine the operating status of the compressor. If
the processor board determines that the compressor is not operating properly through the signal contacts, it will lock the compressor off by deenergizing the proper 24-v control relay on the
relay board. The CPCS board contains logic that can detect if
the current-to-ground of any compressor winding exceeds
2.5 amps. If this condition occurs, the CPCS shuts down the
compressor.
A high-pressure switch is wired in series between the MBB
and the CR or CPCS. On compressor A1 and B1 a loss-ofcharge switch is also wired in series with the high-pressure
switch. If the high-pressure switch opens during operation of a
compressor, the compressor will be stopped, the failure will be
detected through the signal contacts, and the compressor will
be locked off. If the lead compressor in either circuit is shut
down by the high-pressure switch, loss-of-charge switch,
ground current protector, or oil safety switch, all compressors
in that circuit are shut down.
NOTE: The CR operates the same as the CPCS, except the
ground current circuit protection is not provided.

Fig. 13 — Compressor Protection Control
System Module — Sizes 040-110

Fig. 14 — Compressor Ground Fault Module
— Sizes 130-210

Compressor Ground Current Protection
Board (CGF) and Control Relay (CR) — The
30GTN,R and 30GUN,R 130-210, and associated modular
units (see Table 1) contain one compressor ground current protection board (CGF) (see Fig. 14) for each refrigeration circuit.
The CGF contains logic that can detect if the current-to-ground

15

Electronic Expansion Valve (EXV) (See
Fig. 15) — Standard units are equipped with a bottom seal
EXV. This device eliminates the use of the liquid line solenoid
pumpdown at unit shutdown. An O-ring has been added to bottom of orifice assembly to complete a seal in the valve on shutdown. This is not a mechanical shut-off. When service is
required, use the liquid line service valve to pump down the
system.
High pressure refrigerant enters bottom of valve where it
passes through a group of machined slots in side of orifice assembly. As refrigerant passes through the orifice, it drops in
pressure. To control flow of refrigerant, the sleeve slides up and
down along orifice assembly, modulating the size of orifice.
The sleeve is moved by a linear stepper motor that moves in increments controlled directly by the processor. As stepper motor
rotates, the motion is translated into linear movement of lead
screw. There are 1500 discrete steps with this combination. The
valve orifice begins to be exposed at 320 steps. Since there is
not a tight seal with the orifice and the sleeve, the minimum position for operation is 120 steps.
Two thermistors are used to determine suction superheat.
One thermistor is located in the cooler and the other is located
in the cylinder end of the compressor after refrigerant has
passed over the motor. The difference between the 2 thermistors is the suction superheat. These machines are set up to
provide approximately 5 to 7 F (2.8 to 3.9 C) superheat leaving
the cooler. Motor cooling accounts for approximately 22 F
(12.2 C) on 30GTN,R units and 16 F (8.9 C) on 30GUN,R
units, resulting in a superheat entering compressor cylinders of
approximately 29 F (16.1 C) for 30GTN,R units and 23 F
(12.8 C) for 30GUN,R units.
Because the valves are controlled by the EXV module, it is
possible to track the position of the valve. Valve position can be
used to control head pressure and system refrigerant charge.
During initial start-up, the EXV module will drive each
valve fully closed. After initialization period, valve position is
controlled by the EXV module and the MBB.
The EXV is used to limit the maximum cooler saturated
suction temperature to 55 F (12.8 C). This makes it possible for
the chiller to start at high cooler fluid temperatures without
overloading the compressor.

STEPPER
MOTOR (12 VDC)
LEAD SCREW

PISTON SLEEVE

ORIFICE ASSEMBLY
(INSIDE PISTON SLEEVE)

Fig. 15 — Electronic Expansion Valve (EXV)
an external 4 to 20 mA signal (requires Energy Management
Module FIOP/accessory).
With the automatic lead-lag feature in the unit, the control
determines which circuit will start first, A or B. At the first call
for cooling, the lead compressor crankcase heater will be deenergized, a condenser fan will start, and the compressor will start
unloaded.
NOTE: The automatic lead-lag feature is only operative when
an even number of unloaders is present. The 040-070 units
require an accessory unloader to be installed on the B1 compressor for the lead-lag feature to be in effect.
If the circuit has been off for 15 minutes, and the unit is a
TXV unit, liquid line solenoid will remain closed during startup of each circuit for 15 seconds while the cooler and suction
lines are purged of any liquid refrigerant. For units with EXVs,
the lead compressor will be signaled to start. The EXV will remain at minimum position for 10 seconds before it is allowed
to modulate.
After the purge period, the EXV will begin to meter the refrigerant, or the liquid line solenoid will open allowing the
TXV to meter the refrigerant to the cooler. If the off-time is less
than 15 minutes, the EXV will be opened as soon as the compressor starts.
The EXVs will open gradually to provide a controlled startup to prevent liquid flood-back to the compressor. During startup, the oil pressure switch is bypassed for 2 minutes to allow
for the transient changes during start-up. As additional stages
of compression are required, the processor control will add
them. See Tables 5A and 5B.
If a circuit is to be stopped, the control will first start to close
the EXV or close the liquid line solenoid valve.
For units with TXVs, the lag compressor(s) will be shut
down and the lead compressor will continue to operate for
10 seconds to purge the cooler of any refrigerant.
For units with EXVs, the lag compressor(s) will be shut
down and the lead compressor will continue to run. After the
lag compressor(s) has shut down, the EXV is signaled to close.
The lead compressor will remain on for 10 seconds after the
EXV is closed.
During both algorithms (TXV and EXV), all diagnostic
conditions will be honored. If a safety trip or alarm condition is
detected before pumpdown is complete, the circuit will be shut
down.

Energy Management Module (Fig. 16) — This
factory-installed option or field-installed accessory is used for
the following types of temperature reset, demand limit, and/or
ice features:
• 4 to 20 mA leaving fluid temperature reset (requires
field-supplied 4 to 20 mA generator)
• 4 to 20 mA cooling set point reset (requires fieldsupplied 4 to 20 mA generator)
• Discrete inputs for 2-step demand limit (requires fieldsupplied dry contacts capable of handling a 5 vdc, 1 to
20 mA load)
• 4 to 20 mA demand limit (requires field-supplied 4 to
20 mA generator)
• Discrete input for Ice Done switch (requires fieldsupplied dry contacts capable of handling a 5 vdc, 1 to
20 mA load)
See Demand Limit and Temperature Reset sections on
pages 46 and 43 for further details.

Capacity Control — The control system cycles compressors, unloaders, and hot gas bypass solenoids to maintain
the user-configured leaving chilled fluid temperature set point.
Entering fluid temperature is used by the Main Base Board
(MBB) to determine the temperature drop across the cooler and
is used in determining the optimum time to add or subtract capacity stages. The chilled fluid temperature set point can be automatically reset by the return temperature reset or space and
outdoor-air temperature reset features. It can also be reset from
16

J2

LEN

J3

TEST 1

PWR

J4

J1

STATUS

CEPL130351-01

CEBD430351-0396-01C

J5

J7
J6

RED LED - STATUS

TEST 2

GREEN LED LEN (LOCAL EQUIPMENT NETWORK)

ADDRESS
DIP SWITCH

Fig. 16 — Energy Management Module

value ranges from –100 to + 100%. If the next stage of capacity
is a compressor, the control starts (stops) a compressor when
the ratio reaches +100% (–100%). If the next stage of capacity
is an unloader, the control deenergizes (energizes) an unloader
when the ratio reaches +60% (–60%). Unloaders are allowed to
cycle faster than compressors, to minimize the number of starts
and stops on each compressor. A delay of 90 seconds occurs after each capacity step change.

The capacity control algorithm runs every 30 seconds. The
algorithm attempts to maintain the leaving chilled water temperature at the control point. Each time it runs, the control reads
the entering and leaving fluid temperatures. The control determines the rate at which conditions are changing and calculates
2 variables based on these conditions. Next, a capacity ratio is
calculated using the 2 variables to determine whether or not to
make any changes to the current stages of capacity. This ratio

17

Table 5A — Part Load Data Percent Displacement, Standard Units
UNIT
30GTN,R
30GUN,R
040 (60 Hz)

040 (50 Hz)
045 (60 Hz)
045 (50 Hz)
050 (60 Hz)
050 (50 Hz)
060 (60 Hz)
060 (50 Hz)
070 (60 Hz)

070 (50 Hz)

080, 230B (60 Hz)

080, 230B (50 Hz)

090, 245B (60 Hz)

090, 245B (50 Hz)

100, 255B,
270B (60 Hz)

CONTROL
STEPS
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
5
6
1
2
3
4
5
6
7
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11

LOADING SEQUENCE A
% Displacement
Compressors
(Approx)
25
A1*
50
A1
75
A1*, B1
100
A1,B1
24
A1*
47
A1
76
A1*,B1
100
A1,B1
31
A1*
44
A1
87
A1*,B1
100
A1,B1
28
A1*
42
A1
87
A1*,B1
100
A1,B1
33
A1*
50
A1
83
A1*,B1
100
A1,B1
19
A1*
27
A1
65
A1*,B1
73
A1,B1
92
A1*,A2,B1
100
A1,A2,B1
22
A1*
34
A1
52
A1*,B1*
67
A1*,B1
78
A1,B1
89
A1*,A2,B1
100
A1,A2,B1
17
A1*
25
A1
42
A1*,B1*
54
A1*,B1
62
A1,B1
79
A1*,A2,B1*
92
A1*,A2,B1
100
A1,A2,B1
18
A1*
27
A1
35
A1*,B1*
44
A1*,B1
53
A1,B1
56
A1*,A2,B1*
65
A1*,A2,B1
74
A1,A2,B1
82
A1*,A2,B1*,B2
91
A1*,A2,B1,B2
100
A1,A2,B1,B2
14
A1
21
A1
29
A1*,B1*
36
A1*,B1
43
A1,B1
61
A1*,A2,B1*
68
A1*,A2,B1
75
A1,A2,B1
86
A1*,A2,B1*,B2
93
A1*,A2,B1,B2
100
A1,A2,B1,B2
16
A1*
23
A1
31
A1*,B1*
39
A1*,B1
46
A1,B1
58
A1*,A2,B1*
66
A1*,A2,B1
73
A1,A2,B1
85
A1*,A2,B1*,B2
92
A1*,A2,B1,B2
100
A1,A2,B1,B2

*Unloaded compressor.
NOTE: These capacity control steps may vary due to lag compressor sequencing.

18

LOADING SEQUENCE B
% Displacement
Compressors
(Approx)
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
30
B1*
44
B1
52
A1*,B1*
63
A1,B1*
78
A1,B1
85
A1,A2,B1*
100
A1,A2,B1
25
B1*
38
B1
42
A1*,B1*
50
A1, B1*
62
A1,B1
79
A1*,A2,B1*
88
A1,A2,B1*
100
A1,A2,B1
18
B1*
27
B1
35
A1*,B1*
44
A1,B1
53
A1,B1
62
A1*,B1*,B2
71
A1,B1*,B2
80
A1,B1,B2
82
A1*,A2,B1*,B2
91
A1,A2,B1*,B2
100
A1,A2,B1,B2
14
B1*
21
B1
29
A1*,B1*
36
A1,B1*
43
A1,B1
53
A1*,B1*,B2
60
A1,B1*,B2
67
A1,B1,B2
86
A1*,A2,B1*,B2
93
A1,A2,B1*,B2
100
A1,A2,B1,B2
16
A1*
23
A1
31
A1*,B1*
39
A1*,B1
46
A1,B1
58
A1*,A2,B1*
66
A1*,A2,B1
73
A1,A2,B1
85
A1*,A2,B1*,B2
92
A1*,A2,B1,B2
100
A1,A2,B1,B2

Table 5A — Part Load Data Percent Displacement, Standard Units (cont)
UNIT
30GTN,R
30GUN,R

100, 255B
270B (50 Hz)

110, 290B,
315B (60 Hz)

110, 290B,
315B (50 Hz)

130 (60 Hz)

130 (50 Hz)

150, 230A, 245A,
255A (60 Hz)

CONTROL
STEPS
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14

LOADING SEQUENCE A
% Displacement
Compressors
(Approx)
13
A1*
20
A1
26
A1*,B1*
33
A1,B1
40
A1,B1
57
A1*,A2,B1*
63
A1*,A2,B1
70
A1,A2,B1
87
A1*,A2,B1*,B2
93
A1*,A2,B1,B2
100
A1,A2,B1,B2
14
A1*
21
A1
29
A1*,B1*
36
A1*,B1
43
A1,B
61
A1*,A2,B1*
68
A1*,A2,B1
75
A1,A2,B1
86
A1*,A2,B1*,B2
93
A1*,A2,B1,B2
100
A1,A2,B1,B2
17
A1*
25
A1
33
A1*,B1*
42
A1*,B1
50
A1,B1
58
A1*,A2,B1*
67
A1*,A2,B1
75
A1,A2,B1
83
A1*,A2,B1*,B2
92
A1*,A2,B1,B2
100
A1,A2,B1,B2
14
A1*
21
A1
28
A1*,B1*
35
A1*,B1
42
A1,B1
58
A1*,A2,B1*
64
A1*,A2,B1
71
A1,A2,B1
87
A1*,A2,B1*,B2
93
A1*,A2,B1,B2
100
A1,A2,B1,B2
10
A1*
14
A1
26
A1*,B1*
35
A1*,B1
39
A1,B1
44
A1*,A2,B1*
53
A1*,A2,B1
57
A1,A2,B1
69
A1*,A2,B1*,B2
78
A1*,A2,B1,B2
82
A1,A2,B1,B2
87
A1*,A2,A3,B1*,B2
96
A1*,A2,A3,B1,B2
100
A1,A2,A3,B1,B2
11
A1*
15
A1
29
A1*,B1*
38
A1*,B1
42
A1,B1
44
A1*,A2,B1*
53
A1*,A2,B1
58
A1,A2,B1
71
A1*,A2,B1*,B2
80
A1*,A2,B1,B2
85
A1,A2,B1,B2
86
A1*,A2,A3,B1*,B2
95
A1*,A2,A3,B1,B2
100
A1,A2,A3,B1,B2

*Unloaded compressor.
NOTE: These capacity control steps may vary due to lag compressor sequencing.

19

LOADING SEQUENCE B
% Displacement
Compressors
(Approx)
13
B1*
20
B1
26
A1*,B1*
33
A1,B1
40
A1,B1
57
A1*,B1*,B2
63
A1,B1*,B2
70
A1,B1,B2
87
A1*,A2,B1*,B2
93
A1,A2,B1*,B2
100
A1,A2,B1,B2
14
B1*
21
B1
29
A1*,B1*
36
A1,B1*
43
A1,B1
53
A1*,B1*,B2
60
A1,B1*,B2
67
A1,B1,B2
86
A1*,A2,B1*,B2
93
A1,A2,B1*,B2
100
A1,A2,B1,B2
17
B1*
25
B1
33
A1*,B1*
42
A1,B1*
50
A1,B1
58
A1*,B1*,B2
67
A1,B1*,B2
75
A1,B1,B2
83
A1*,A2,B1*,B2
92
A1,A2,B1*,B2
100
A1,A2,B1,B2
14
B1*
21
B1
28
A1*,B1*
35
A1,B1*
42
B1,B1
58
A1*,B1*,B2
64
A1,B1*,B2
71
A1,G1,B2
87
A1*,A2,B1*,B2
93
A1,A2,B1*,B2
100
A1,A2,B1,B2
16
B1*
25
B1
26
A1*,B1*
31
A1,B1*
39
A1,B1
51
A1*,B1*,B2
56
A1,B1*,B2
64
A1,B1,B2
69
A1*,A2,B1*,B2
75
A1,A2,B1*,B2
82
A1,A2,B1,B2
87
A1*,A2,A3,B1*,B2
91
A1,A2,A3,B1*,B2
100
A1,A2,A3,B1,B2
18
B1*
27
B1
29
A1*,B1*
33
A1,B1*
42
A1,B1
55
A1*,B1*,B2
60
A1,B1*,B2
69
A1,B1,B2
71
A1*,A2,B1*,B2
75
A1,A2,B1*,B2
85
A1,A2,B1,B2
86
A1*,A2,A3,1*,B2
91
A1,A2,A3,B1*,B2
100
A1,A2,A3,B1,B2

Table 5A — Part Load Data Percent Displacement, Standard Units (cont)
UNITT
30GTN,R
30GUN,R

150, 230A, 245A,
255A (50 Hz)

170, 270A,
330A/B (60 Hz)

170, 270A,
330A/B,
360B (50 Hz)

190, 290A, 360A/B,
390B (60 Hz)

190, 290A, 360A,
390B (50 Hz)

210, 315A, 390A,
420A/B (60 Hz)

210, 315A, 390A,
420A/B (50 Hz)

CONTROL
STEPS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
7
1
2
3
4
5
6
7

LOADING SEQUENCE A
% Displacement
Compressors
(Approx)
13
A1*
20
A1
26
A1*,B1*
33
A1*,B1
40
A1,B1
46
A1*,A2,B1*
53
A1*,A2,B1
60
A1,A2,B1
66
A1*,A2,B1*,B2
73
A1*,A2,B1,B2
80
A1,A2,B1,B2
86
A1*,A2,A3,B1*,B2
93
A1*,A2,A3,B1,B2
100
A1,A2,A3,B1,B2
A1*
11
A1
17
A1*,B1*
23
A1*,B1
28
A1,B1
33
A1*,A2,B1*
39
A1*,A2,B1
45
A1,A2,B1
50
A1*,A2,B1*,B2
56
A1*,A2,B1,B2
61
A1,A2,B1,B2
67
A1*,A2,A3,B1*,B2
73
A1*,A2,A3,B1,B2
78
A1,A2,A3,B1,B2
83
A1*,A2,A3,B1*,B2,B3
89
95
A1*,A2,A3,B1,B2,B3
100
A1,A2,A3,B1,B2,B3
A1*
9
A1
14
A1*,B1*
19
A1*,B1
23
A1,B1
28
A1*,A2,B1*
33
A1*,A2,B1
37
A1,A2,B1
42
A1*,A2,B1*,B2
52
A1*,A2,B1,B2
57
A1,A2,B1,B2
61
A1*,A2,A3,B1*,B2
72
A1*,A2,A3,B1,B2
76
A1,A2,A3,B1,B2
81
A1*,A2,A3,B1*,B2,B3
91
A1*,A2,A3,B1,B2,B3
96
A1,A2,A3,B1,B2,B3
100
A1
13
A1,B1
25
A1,A2,B1
41
A1,A2,B1,B2
56
A1,A2,A3,B1,B2
78
A1,A2,A3,B1,B2,B3
100
17
A1
33
A1,B1
50
A1,A2,B1
67
A1,A2,B1,B2
83
A1,A2,A3,B1,B2
100
A1,A2,A3,B1,B2,B3
11
A1
25
A1,B1
36
A1,A2,B1
56
A1,A2,B1,B2
67
A1,A2,A3,B1,B2
86
A1,A2,A3,B1,B2,B3
100
A1,A2,A3,A4,B1,B2,B3
9
A1
26
A1,B1
35
A1,A2,B1
51
A1,A2,B1,B2
67
A1,A2,A3,B1,B2
84
A1,A2,A3,B1,B2,B3
100
A1,A2,A3,A4,B1,B2,B3

*Unloaded compressor.
NOTE: These capacity control steps may vary due to lag compressor sequencing.

20

LOADING SEQUENCE B
% Displacement
Compressors
(Approx)
13
B1*
20
B1
26
A1*,B1*
33
A1,B1*
40
A1,B1
46
A1*,B1*,B2
53
A1,B1*,B2
60
A1,B1,B2
66
A1*,A2,B1*,B2
73
A1,A2,B1*,B2
80
A1,A2,B1,B2
86
A1*,A2,A3,B1*,B2
93
A1,A2,A3,B1*,B2
100
A1,A2,A3,B1,B2
B1*
11
B1
17
A1*,B1*
23
A1,B1*
28
A1,B1
33
A1*,B1*,B2
39
A1,B1*,B2
45
A1,B1,B2
50
A1*,A2,B1*,B2
56
A1,A2,B1*,B2
61
A1,A2,B1,B2
67
A1*,A2,B1*,B2,B3
73
78
A1,A2,B1*,B2,B3
A1,A2,B1,B2,B3
83
A1*,A2,A3,B1*,B2,B3
89
95
A1,A2,A3,B1*,B2,B3
100
A1,A2,A3,B1,B2,B3
B1*
9
B1
14
A1*,B1*
19
A1,B1*
23
A1,B1
28
A1*,B1*,B2
38
A1,B1*,B2
43
A1,B1,B2
47
A1*,A2,B1*,B2
52
A1,A2,B1*,B2
57
A1,A2,B1,B2
61
A1*,A2,B1*,B2,B3
72
A1,A2,B1*,B2,B3
76
A1,A2,B1,B2,B3
81
A1*,A2,A3,B1*,B2,B3
91
A1,A2,A3,B1*,B2,B3
96
A1,A2,A3,B1,B2,B3
100
B1
13
A1,B1
25
A1,B1,B2
41
A1,A2,B1,B2
56
A1,A2,B1,B2,B3
78
A1,A2,A3,B1,B2,B3
100
17
B1
33
A1,B1
50
A1,B1,B2
67
A1,A2,B1,B2
83
A1,A2,B1,B2,B3
100
A1,A2,A3,B1,B2,B3
14
B1
25
A1,B1
44
A1,B1,B2
56
A1,A2,B1,B2
75
A1,A2,B1,B2,B3
86
A1,A2,A3,B1,B2,B3
100
A1,A2,A3,A4,B1,B2,B3
16
B1
26
A1,B1
42
A1,B1,B2
51
A1,A2,B1,B2
67
A1,A2,B1,B2,B3
84
A1,A2,A3,B1,B2,B3
100
A1,A2,A3,A4,B1,B2,B3

Table 5B — Part Load Data Percent Displacement, With Accessory Unloaders
UNIT
30GTN,R
30GUN,R
040 (60 Hz)

040 (50 Hz)
045 (60 Hz)

045 (50 Hz)
050 (60 Hz)

050 (50 Hz)
060 (60 Hz)

060 (50 Hz)
070 (60 Hz)

070 (50 Hz)

080, 230B (60 Hz)

080, 230B (50 Hz)

090, 245B (60 Hz)

CONTROL
STEPS
1
2
3
4
1
2
3
4
5
6
7
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
12

LOADING SEQUENCE A
% Displacement
Compressors
(Approx)
25
A1*
50
A1
75
A1*,B1
100
A1,B1
24
A1*
47
A1
45
A1*,B1†
61
A1*,B1*
84
A1,B1*
100
A1,B1
—
—
18
A1†
31
A1*
44
A1
38
A1†,B1†
51
A1*,B1†
69
A1*,B1*
82
A1,B1*
100
A1,B1
15
A1†
28
A1*
42
A1
33
A1†,B1†
47
A1*,B1†
67
A1*,B1*
80
A1,B1*
100
A1,B1
16
A1†
33
A1*
50
A1
31
A1†,B1†
49
A1*,B1†
66
A1*,B1*
83
A1,B1*
100
A1,B1
11
A1†
19
A1*
27
A1
25
A1†,B1†
33
A1*,B1†
49
A1*,B1*
57
A1,B1*
73
A1,B1
84
A1†,A2,B1
92
A1*,A2,B1
100
A1,A2,B1
11
A1†
22
A1*
34
A1
41
A1†,B1*
55
A1†,B1
67
A1*,B1
78
A1,B1
89
A1*,A2,B1
100
A1,A2,B1
8
A1†
17
A1*
25
A1
33
A1†,B1*
46
A1†,B1
54
A1*,B1
62
A1,B1
71
A1†,A2,B1*
84
A1†,A2,B1
92
A1*,A2,B1
100
A1,A2,B1
9
A1†
18
A1*
27
A1
35
A1†,B1
44
A1*,B1
53
A1,B1
56
A1†,A2,B1
65
A1*,A2,B1
74
A1,A2,B1
82
A1†,A2,B1,B2
91
A1*,A2,B1,B2
100
A1,A2,B1,B2

LOADING SEQUENCE B
% Displacement
Compressors
(Approx)
25
B1*
50
B1
75
A1,B1*
100
A1,B1
21
B1†
37
B1*
53
B1
45
A1*,B1†
61
A1*,B1*
84
A1,B1*
100
A1,B1
20
B1†
38
B1*
56
B1
38
A1†,B1†
51
A1*,B1†
69
A1*,B1*
82
A1,B1*
100
A1,B1
18
B1†
38
B1*
58
B1
33
A1†,B1†
47
A1*,B1†
67
A1*,B1*
80
A1,B1*
100
A1,B1
16
B1†
33
B1*
50
B1
31
A1†,B1†
49
A1*,B1†
66
A1*,B1*
83
A1,B1*
100
A1,B1
15
B1†
31
B1*
47
B1
25
A1†,B1†
33
A1*,B1†
49
A1*,B1*
57
A1,B1*
73
A1,B1
68
A1,A2,B1†
84
A1,A2,B1*
100
A1,A2,B1
15
B1†
30
B1*
44
B1
48
A1,B1†
63
A1,B1*
78
A1,B1
85
A1,A2,B1*
100
A1,A2,B1
—
—
13
B1†
25
B1*
38
B1
50
A1,B1*
62
A1,B1
67
A1*,A2,B1†
75
A1,A2,B1†
88
A1,A2,B1*
100
A1,A2,B1
—
—
—
—
9
B1†
18
B1*
27
B1
35
A1,B1†
44
A1,B1*
53
A1,B1
62
A1,B1†,B2
71
A1,B1*,B2
80
A1,B1,B2
82
A1,A2,B1†,B2
91
A1,A2,B1*,B2
100
A1,A2,B1,B2

*Unloaded compressor.
†Two unloaders, both unloaded.
NOTE: Some control steps will be skipped if they do not increase chiller capacity when staging up or decrease chiller capacity when staging down.

21

Table 5B — Part Load Data Percent Displacement, With Accessory Unloaders (cont)
UNIT
30GTN,R
30GUN,R

090, 245B (50 Hz)

100, 255B,
270B (60 Hz)

100, 255B,
270B (50 Hz)

110, 290B,
315B (60 Hz)

110, 290B,
315B (50 Hz)

CONTROL
STEPS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
10
11
12

LOADING SEQUENCE A
% Displacement
Compressors
(Approx)
7
A1†
14
A1*
21
A1
29
A1†,B1
36
A1*,B1
43
A1,B1
49
A1†,A2,B1†
54
A1†,A2,B1*
61
A1†,A2,B1
68
A1*,A2,B1
75
A1,A2,B1
79
A1†,A2,B1*,B2
86
A1†,A2,B1,B2
93
A1*,A2,B1,B2
100
A1,A2,B1,B2
8
A1†
16
A1*
23
A1
31
A1†,B1
39
A1*,B1
46
A1,B1
50
A1†,A2,B1*
58
A1†,A2,B1
66
A1*,A2,B1
73
A1,A2,B1
77
A1†,A2,B1*,B2
85
A1†,A2,B1,B2
92
A1*,A2,B1,B2
100
A1,A2,B1,B2
7
A1†
13
A1*
20
A1
26
A1†,B1
33
A1*,B1
40
A1,B1
43
A1†,A2,B1†
50
A1†,A2,B1*
57
A1†,A2,B1
63
A1*,A2,B1
70
A1,A2,B1
74
A1†,A2,B1†,B2
80
A1†,A2,B1*,B2
89
A1†,A2,B1,B2
93
A1*,A2,B1,B2
100
A1,A2,B1,B2
7
A1†
14
A1*
21
A1
29
A1†,B1
36
A1*,B1
43
A1,B1
47
A1†,A2,B1†
54
A1†A2,B1*
61
A1†,A2,B1
68
A1*,A2,B1
75
A1,A2,B1
79
A1†,A2,B1*,B2
86
A1†,A2,B1,B2
93
A1*,A2,B1,B2
100
A1,A2,B1,B2
8
A1†
17
A1*
25
A1
33
A1†,B1
42
A1*,B1
50
A1,B1
58
A1†,A2,B1
67
A1*,A2,B1
75
A1,A2,B1
83
A1†,A2,B1,B2
92
A1*,A2,B1,B2
100
A1,A2,B1,B2

*Unloaded compressor.
†Two unloaders, both unloaded.
NOTE: These capacity control steps may vary due to lag compressor sequencing.

22

LOADING SEQUENCE B
% Displacement
Compressors
(Approx)
7
B1†
14
B1*
21
B1
29
A1,B1†
36
A1,B1*
43
A1,B1
46
A1*,B1†,B2
53
A1,B1†,B2
60
A1,B1*,B2
67
A1,B1,B2
72
A1†,A2,B1†,B2
79
A1*,A2,B1†,B2
86
A1,A2,B1†,B2
93
A1,A2,B1*,B2
100
A1,A2,B1,B2
8
B1†
16
B1*
23
B1
31
A1,B1†
39
A1,B1*
46
A1,B1
50
A1*,B1†,B2
58
A1,B1†,B2
66
A1,B1*,B2
73
A1,B1,B2
77
A1*,A2,B1†,B2
85
A1,A2,B1†,B2
92
A1,A2,B1*,B2
100
A1,A2,B1,B2
7
B1†
13
B1*
20
B1
26
A1,B1†
33
A1,B1*
40
A1,B1
43
A1†,B1†,B2
50
A1*,B1†,B2
57
A1,B1†,B2
63
A1,B1*,B2
70
A1,B1,B2
74
A1†,A2,B1†,B2
80
A1*,A2,B1†,B2
87
A1,A2,B1†,B2
93
A1,A2,B1*,B2
100
A1,A2,B1,B2
7
B1†
14
B1*
21
B1
29
A1,B1†
36
A1,B1*
43
A1,B1
46
A1*,B1†,B2
53
A1,B1†,B2
60
A1,B1*,B2
67
A1,B1,B2
72
A1†,A2,B1†,B2
79
A1*,A2,B1†,B2
86
A1,A2,B1†,B2
93
A1,A2,B1*,B2
100
A1,A2,B1,B2
8
B1†
17
B1*
25
B1
33
A1,B1†
42
A1,B1*
50
A1,B1
58
A1,B1†,B2
67
A1,B1*,B2
75
A1,B1,B2
83
A1,A2,B1†,B2
92
A1,A2,B1*,B2
100
A1,A2,B1,B2

Table 5B — Part Load Data Percent Displacement, with Accessory Unloaders (cont)
UNIT
30GTN,R
30GUN,R

130 (60 Hz)

130 (50 Hz)

150, 230A, 245A,
255A (60 Hz)

150, 230A, 245A,
255A (50 Hz)

CONTROL
STEPS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

LOADING SEQUENCE A
% Displacement
Compressors
(Approx)
8
A1†
14
A1*
21
A1
22
A1†,B1*
28
A1†,B1
35
A1*,B1
42
A1,B1
44
A1†,A2,B1†
51
A1†,A2,B1*
58
A1†,A2,B1
64
A1,A2,B1
71
A1,A2,B1†
73
A1†,A2,B1†,B2
80
A1†,A2,B1*,B2
87
A1†,A2,B1,B2
93
A1*,A2,B1,B2
100
A1,A2,B1,B2
A1†
6
A1*
10
A1
14
A1†,B1*
22
A1†,B1
31
A1*,B1
35
A1,B1
39
A1†,A2,B1*
40
A1†,A2,B1
49
A1*,A2,B1
53
A1,A2,B1
57
A1†,A2,B1*,B2
65
A1†,A2,B1,B2
74
A1*,A2,B1,B2
78
A1,A2,B1,B2
82
83
A1†,A2,A3,B1*,B2
91
A1†,A2,A3,B1,B2
96
A1*,A2,A3,B1,B2
100
A1,A2,A3,B1,B2
A1†
6
A1*
11
A1
15
A1†,B1*
24
A1†,B1
33
A1*,B1
38
A1,B1
42
A1†,A2,B1
49
A1*,A2,B1
53
A1,A2,B1
58
A1†,A2,B1*,B2
66
A1†,A2,B1,B2
75
A1*,A2,B1,B2
80
A1,A2,B1,B2
85
A1†,A2,A3,B1,B2
91
A1*,A2,A3,B1,B2
95
A1,A2,A3,B1,B2
100
6
A1†
13
A1*
20
A1
26
A1†,B1
33
A1*,B1
40
A1,B1
46
A1†,A2,B1
53
A1*,A2,B1
60
A1,A2,B1
66
A1†,A2,B1,B2
73
A1*,A2,B1,B2
80
A1,A2,B1,B2
86
A1†,A2,A3,B1,B2
93
A1*,A2,A3,B1,B2
100
A1,A2,A3,B1,B2

*Unloaded compressor.
Two unloaders, both unloaded.
NOTE: These capacity control steps may vary due to lag compressor sequencing.

23

LOADING SEQUENCE B
% Displacement
Compressors
(Approx)
8
B1†
14
B1*
21
B1
22
A1*,B1†
28
A1,B1†
35
A1,B1*
42
A1,B1
44
A1†,B1†,B2
51
A1*,B1†,B2
58
A1,B1†,B2
64
A1,B1*,B2
71
A1,B1,B2
73
A1†,A2,B1†,B2
80
A1*,A2,B1†,B2
87
A1,A2,B1†,B2
93
A1,A2,B1*,B2
100
A1,A2,B1,B2
B1†
8
B1*
16
B1
25
A1,B1*
31
A1,B1
39
A1*,B1†,B2
43
A1,B1†,B2
47
A1,B1*,B2
56
A1,B1,B2
64
A1,A2,B1†,B2
65
A1,A2,B1*,B2
74
A1,A2,B1,B2
82
A1,A2,A3,B1†,B2
83
A1,A2,A3,B1*,B2
91
A1,A2,A3,B1,B2
100
—
—
—
—
—
—
—
—
B1†
9
B1*
18
B1
27
A1,B1*
33
A1,B1
42
A1*,B1†,B2
46
A1,B1†,B2
51
A1,B1*,B2
60
A1,B1,B2
69
A1,A2,B1*,B2
75
A1,A2,B1,B2
86
A1,A2,A3,B1*,B2
91
A1,A2,A3,B1,B2
100
—
—
—
—
—
—
—
—
6
B1†
13
B1*
20
B1
26
A1,B1†
33
A1,B1*
40
A1,B1
46
A1,B1†,B2
53
A1,B1*,B2
60
A1,B1,B2
66
A1,A2,B1†,B2
73
A1,A2,B1*,B2
80
A1,A2,B1,B2
86
A1,A2,A3,B1†,B2
93
A1,A2,A3,B1*,B2
100
A1,A2,A3,B1,B2

Table 5B — Part Load Data Percent Displacement, With Accessory Unloaders (cont)
UNIT
30GTN,R
30GUN,R

170, 270A,
330A/B (60 Hz)

170, 270A,
330A/B, 360B (50 Hz)

190, 290A, 360A/B,
390B (60 Hz)

CONTROL
STEPS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

LOADING SEQUENCE A
% Displacement
Compressors
(Approx)
6
A1†
11
A1*
17
A1
17
A1†,B1*
23
A1†,B1
28
A1*,B1
33
A1,B1
34
A1†,A2,B1*
39
A1†,A2,B1
45
A1*,A2,B1
50
A1,A2,B1
51
A1†,A2,B1*,B2
56
A1†,A2,B1,B2
61
A1*,A2,B1,B2
67
A1,A2,B1,B2
67
A1†,A2,A3,B1*,B2
73
A1†,A2,A3,B1,B2
78
A1*,A2,A3,B1,B2
83
A1,A2,A3,B1,B2
84
A1†,A2,A3,B1*,B2,B3
89
A1†,A2,A3,B1,B2,B3
95
A1*,A2,A3,B1,B2,B3
100
A1,A2,A3,B1,B2,B3
A1†
5
A1*
9
A1
14
A1†,B1*
14
A1†B1
19
A1*,B1
23
A1,B1
28
A1†,A2,B1*
28
A1†,A2,B1
33
A1*,A2,B1
37
A1,A2,B1
42
A1†,A2,B1†,B2
43
A1†,A2,B1*,B2
48
A1†,A2,B1,B2
52
A1*,A2,B1,B2
57
A1,A2,B1,B2
61
A1†A2,A3,B1†,B2
63
A1†,A2,A3,B1*,B2
67
A1†,A2,A3,B1,B2
72
A1*,A2,A3,B1,B2
76
A1,A2,A3,B1,B2
81
A1†,A2,A3,B1†,B2,B3
82
A1†,A2,A3,B1*,B2,B3
87
A1†,A2,A3,B1,B2,B3
91
A1*,A2,A3,B1,B2,B3
96
A1,A2,A3,B1,B2,B3
100
9
A1*
13
A1
18
A1*,B1*
21
A1*,B1
25
A1,B1
33
A1*,A2,B1*
37
A1*,A2,B1
41
A1,A2,B1
49
A1*,A2,B1*,B2
53
A1*,A2,B1,B2
56
A1,A2,B1,B2
71
A1*,A2,A3,B1*,B2
74
A1*,A2,A3,B1,B2
78
A1,A2,A3,B1,B2
93
A1*,A2,A3,B1*,B2,B3
96
A1*,A2,A3,B1,B2,B3
100
A1,A2,A3,B1,B2,B3

*Unloaded compressor.
†Two unloaders, both unloaded.
NOTE: These capacity control steps may vary due to lag compressor sequencing.

24

LOADING SEQUENCE B
% Displacement
Compressors
(Approx)
6
B1†
11
B1*
17
B1
17
A1*,B1†
23
A1,B1†
28
A1,B1*
33
A1,B1
34
A1*,B1†,B2
39
A1,B1†,B2
45
A1,B1*,B2
50
A1,B1,B2
51
A1*,A2,B1†,B2
56
A1,A2,B1†,B2
61
A1,A2,B1*,B2
67
A1,A2,B1,B2
67
A1*,A2,B1†,B2,B3
73
A1,A2,B1†,B2,B3
78
A1,A2,B1*,B2,B3
83
A1,A2,B1,B2,B3
84
A1*,A2,A3,B1†,B2,B3
89
A1,A2,A3,B1†,B2,B3
95
A1,A2,A3,B1*,B2,B3
100
A1,A2,A3,B1,B2,B3
B1†
5
B1*
9
B1
14
A1*,B1†
14
A1,B1†
19
A1,B1*
23
A1,B1
28
A1†,B1†,B2
29
A1*,B1†,B2
34
A1,B1†,B2
38
A1,B1*,B2
43
A1,B1,B2
47
48
A1*,A2,B1†,B2
A1,A2,B1†,B2
52
A1,A2,B1*,B2
57
A1,A2,B1,B2
61
A1†,A2,B1†,B2,B3
63
A1*,A2,B1†,B2,B3
67
A1,A2,B1†,B2,B3
72
A1,A2,B1*,B2,B3
76
A1,A2,B1,B2,B3
81
A1†,A2,A3,B1†,B2,B3
82
A1*,A2,A3,B1†,B2,B3
87
A1,A2,A3,B1†,B2,B3
91
96
A1,A2,A3,B1*,B2,B3
A1,A2,A3,B1,B3,B3
100
9
B1*
13
B1
18
A1*,B1*
21
A1,B1*
25
A1,B1
33
A1*,B1*,B2
37
A1,B1*,B2
41
A1,B1,B2
49
A1*,A2,B1*,B2
53
A1,A2,B1*,B2
56
A1,A2,B1,B2
71
A1*,A2,B1*,B2,B3
74
A1,A2,B1*,B2,B3
78
A1,A2,B1,B2,B3
93
A1*,A2,A3,B1*,B2,B3
96
A1,A2,A3,B1*,B2,B3
100
A1,A2,A3,B1,B2,B3

Table 5B — Part Load Data Percent Displacement, With Accessory Unloaders (cont)
UNIT
30GTN,R
30GUN,R

190, 290A, 360A,
390B (50 Hz)

210, 315A, 390A,
420A/B (60 Hz)

210, 315A, 390A,
420A/B (50 Hz)

CONTROL
STEPS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

LOADING SEQUENCE A
% Displacement
Compressors
(Approx)
11
A1*
11
A1
22
A1*,B1*
28
A1*,B1
33
A1,B1
39
A1*,A2,B1*
44
A1*,A2,B1
50
A1,A2,B1
55
A1*,A2,B1*,B2
61
A1*,A2,B1,B2
67
A1,A2,B1,B2
72
A1*,A2,A3,B1*,B2
78
A1*,A2,A3,B1,B2
83
A1,A2,A3,B1,B2
89
A1*,A2,A3,B1*,B2,B3
94
A1*,A2,A3,B1,B2,B3
100
A1,A2,A3,B1,B2,B3
A1*
8
A1
11
A1*,B1*
17
A1*,B1
22
A1,B1
25
A1*,A2,B1*
28
A1*,A2,B1
33
A1,A2,B1
36
A1*,A2,B1*,B2
48
A1*,A2,B1,B2
52
A1,A2,B1,B2
56
A1*,A2,A3,B1*,B2
59
A1*,A2,A3,B1,B2
63
A1,A2,A3,B1,B2
67
A1*,A2,A3,B1*,B2,B3
78
A1*,A2,A3,B1,B2,B3
83
A1,A2,A3,B1,B2,B3
86
92
A1*,A2,A3,A4,B1*,B2,B3
97
A1*,A2,A3,A4,B1,B2,B3
100
A1,A2,A3,A4,B1,B2,B3
A1*
7
A1
9
A1*,B1*
17
A1*,B1
23
A1,B1
26
A1*,A2,B1*
27
A1*,A2,B1
32
A1,A2,B1
35
A1*,A2,B1*,B2
43
A1*,A2,B1,B2
48
A1,A2,B1,B2
51
A1*,A2,A3,B1*,B2
59
65
A1*,A2,A3,B1,B2
67
A1,A2,A3,B1,B2
75
A1*,A2,A3,B1*,B2,B3
81
A1*,A2,A3,B1,B2,B3
84
A1,A2,A3,B1,B2,B3
92
A1*,A2,A3,A4,B1*,B2,B3
A1*,A2,A3,A4,B1,B2,B3
97
A1,A2,A3,A4,B1,B2,B3
100

*Unloaded compressor.
†Two unloaders, both unloaded.
NOTE: These capacity control steps may vary due to lag compressor sequencing.

25

LOADING SEQUENCE B
% Displacement
Compressors
(Approx)
11
B1*
17
B1
22
A1*,B1*
28
A1,B1*
33
A1,B1
39
A1*,B1*,B2
44
A1,B1*,B2
50
A1,B1,B2
55
A1*,A2,B1*,B2
61
A1,A2,B1*,B2
67
A1,A2,B1,B2
72
A1*,A2,B1*,B2,B3
78
A1,A2,B1*,B2,B3
83
A1,A2,B1,B2,B3
89
A1*,A2,A3,B1*,B2,B3
94
A1,A2,A3,B1*,B2,B3
100
A1,A2,A3,B1,B2,B3
B1*
9
B1
14
A1*,B1*
17
A1,B1*
21
A1,B1
25
A1*,B1*,B2
37
A1,B1*,B2
40
A1,B1,B2
44
A1*,A2,B1*,B2
48
A1,A2,B1*,B2
51
A1,A2,B1,B2
56
A1*,A2,B1*,B2,B3
67
A1,A2,B1*,B2,B3
71
A1,A2,B1,B2,B3
75
A1*,A2,A3,B1*,B2,B3
78
82
A1,A2,A3,B1*,B2,B3
A1,A2,A3,B1,B2,B3
86
A1*,A2,A3,A4,B1*,B2,B3
92
96
A1,A2,A3,A4,B1*,B2,B3
100
A1,A2,A3,A4,B1,B2,B3
B1*
11
B1
16
A1*,B1*
17
A1,B1*
20
A1,B1
26
A1*,B1*,B2
34
A1,B1*,B2
36
A1,B1,B2
42
A1*,A2,B1*,B2
43
A1,A2,B1*,B2
46
A1,A2,B1,B2
51
A1*,A2,B1*,B2,B3
59
62
A1,A2,B1*,B2,B3
67
A1,A2,B1,B2,B3
75
A1*,A2,A3,B1*,B2,B3
78
A1,A2,A3,B1*,B2,B3
84
A1,A2,A3,B1,B2,B3
92
A1*,A2,A3,A4,B1*,B2,B3
A1,A2,A3,A4,B1*,B2,B3
94
A1,A2,A3,A4,B1,B2,B3
100

there is a change in the direction of capacity (increase or decrease) and each circuit’s capacity is equal.
CAPACITY SEQUENCE DETERMINATION (LOAD,
Configuration Mode under OPT2) — This is configurable as
equal circuit loading or staged circuit loading with the default
set at equal. The control determines the order in which the steps
of capacity for each circuit are changed. This control
choice does NOT have any impact on machines with only
2 compressors.
CAPACITY CONTROL OVERRIDES — The
following
overrides will modify the normal operation of the routine.
Deadband Multiplier — The user configurable Deadband
Multiplier (Z.GN, Configuration Mode under SLCT) has a
default value of 1.0. The range is from 1.0 to 4.0. When set to
other than 1.0, this factor is applied to the capacity Load/Unload Factor. The larger this value is set, the longer the control
will delay between adding or removing stages of capacity.
Figure 17 shows how compressor starts can be reduced over
time if the leaving water temperature is allowed to drift a larger
amount above and below the set point. This value should be set
in the range of 3.0 to 4.0 for systems with small loop volumes.
First Stage Override — If the current capacity stage is zero,
the control will modify the routine with a 1.2 factor on adding
the first stage to reduce cycling. This factor is also applied
when the control is attempting to remove the last stage of
capacity.
Slow Change Override — The control prevents the capacity
stages from being changed when the leaving fluid temperature
is close to the set point (within an adjustable deadband) and
moving towards the set point.
Ramp Loading (CRMP, Configuration Mode under SLCT) —
Limits the rate of change of leaving fluid temperature. If the
unit is in a Cooling mode and configured for Ramp Loading,
the control makes 2 comparisons before deciding to change
stages of capacity. The control calculates a temperature difference between the control point and leaving fluid temperature. If
the difference is greater than 4° F (2.2° C) and the rate of
change (°F or °C per minute) is more than the configured Cooling Ramp Loading value (CRMP), the control does not allow
any changes to the current stage of capacity.
Low Entering Fluid Temperature Unloading — When the
entering fluid temperature is below the control point, the control will attempt to remove 25% of the current stages being
used. If exactly 25% cannot be removed, the control removes
an amount greater than 25% but no more than necessary. The
lowest stage will not be removed.

ADDING ADDITIONAL UNLOADERS — See Table 6
below for required hardware.
Follow accessory instructions for installation. Connect unloader coil leads to PINK wires in compressor A1/B1 junction
box. Configuration items CA.UN and CB.UN in the OPT1
sub-mode of the configuration mode must be changed to match
the new number of unloaders. Two unloaders cannot be used
with hot gas bypass on a single circuit.
MINUTES LEFT FOR START — This value is displayed
only in the network display tables (using Service Tool or
ComfortWORKS® software) and represents the amount of
time to elapse before the unit will start its initialization routine.
This value can be zero without the machine running in many
situations. This can include being unoccupied, ENABLE/OFF/
REMOTE CONTACT switch in the OFF position, CCN not
allowing unit to start, Demand Limit in effect, no call for cooling due to no load, and alarm or alert conditions present. If the
machine should be running and none of the above are true, a
minimum off time (DELY, see below) may be in effect. The
machine should start normally once the time limit has expired.
MINUTES OFF TIME (DELY, Configuration Mode under
OPT2) — This user configurable time period is used by the
control to determine how long unit operation is delayed after
power is applied/restored to the unit. Typically, this time period
is configured when multiple machines are located on a single
site. For example, this gives the user the ability to prevent all
the units from restarting at once after a power failure. A value
of zero for this variable does not mean that the unit should be
running.
LOADING SEQUENCE — The 30GTN,R and 30GUN,R
compressor efficiency is greatest at partial load. Therefore, the
following sequence list applies to capacity control.
The next compressor will be started with unloaders energized on both lead compressors.
All valid capacity combinations using unloaders will be
used as long as the total capacity is increasing.
LEAD/LAG DETERMINATION (LLCS, Configuration
Mode under OPT2) — This is a configurable choice and is
factory set to be automatic (for sizes 080-420) or Circuit A
leading (for 040-070 sizes). For 040-070 sizes, the value can be
changed to Automatic or Circuit B only if an accessory unloader is added to compressor B1. For 080-420 sizes, the value can
be changed to Circuit A or Circuit B leading, as desired. Set at
automatic, the control will sum the current number of logged
circuit starts and one-quarter of the current operating hours for
each circuit. The circuit with the lowest sum is started first.
Changes to which circuit is the lead circuit and which is the lag
are also made when total machine capacity is at 100% or when

Table 6 — Required Hardware for Additional Unloaders
UNIT
30GTN,GTR,GUN,GUR

COMP.

FACTORY
STANDARD

ADDITIONAL
UNLOADERS

UNLOADER
PACKAGE*

SOLENOID
COIL

A1
B1
A1

1
0
1

N/A
06EA-660---138
N/A

B1

0

N/A
EF19ZE024
N/A
EF19ZE024
Not Required

A1

1

B1

0

A1
B1
A1
B1

1
1
1
1

0
1
0
1
2
1
1
2
1
1
1
1

040 (60 Hz)
040 (50 Hz)
045 (60 Hz)
045 (50 Hz)
050-070
080-110**
130 (60 Hz)
130 (50 Hz)
150-210**

06EA-660---138

Not Required
30GT-911---031

EF19ZE024

Not Required
30GT-911---031

06EA-660---138

Not Required

30GT-911---031

06EA-660---138

EF19ZE024

Not Required

*Requires one per additional unloader.
†2 solenoid coils are included in the CXB Accessory.
**And associated modular units.

26

Not Required

Not Required

06EA-660---138

LEGEND
CBX — Compressor Expansion Board

CXB ACCESSORY†

2 STARTS

DEADBAND EXAMPLE
47

7

6

46
45

LWT (F)

LWT (C)

8

44
43
42

5

41
0

200

400

600

TIME (SECONDS)

LEGEND
LWT — Leaving Water Temperature

800

1000
3 STARTS

STANDARD
DEADBAND
MODIFIED
DEADBAND

Fig. 17 — Deadband Multiplier
During the first 10 minutes after circuit start-up, MBBcontrolled fans are not turned on until T3 and T4 are greater
than the head pressure set point plus 10 F (5.6 C). If T3 and T4
are greater than 95 F (35 C) just prior to circuit start-up, all
MBB-controlled fan stages are turned on to prevent excessive
discharge pressure during pull-down. Fan sequences are shown
in Fig. 17.
UNITS WITH TXV — The logic to cycle MBB-controlled
fans is based on saturated condensing temperature only, as
sensed by thermistors T3 and T4 (see Fig. 8 and 10). When
either T3 or T4 exceeds the head pressure set point, the MBB
will turn on an additional stage of fans. For the first 10 minutes
of each circuit operation, the head pressure set point is raised
by 10° F (5.6° C). It will turn off a fan stage when T3 and T4
are both below the head pressure set point by 35° F (19.4° C).
At each change of a fan stage the control will wait for one
minute for head pressure to stabilize unless T3 and T4 is greater than 125 F (51.6 C), in which case all MBB-controlled fans
start immediately. If T3 and T4 are greater than 95 F (35.0 C)
just prior to circuit start-up, all MBB-controlled fan stages are
turned on to prevent excessive discharge pressure during pulldown. Fan sequences are shown in Fig. 18.
Motormaster® Option — For low-ambient operation, the lead
fan(s) in each circuit can be equipped with the Motormaster III
head pressure controller option or accessory. Wind baffles and
brackets must be field-fabricated for all units using accessory
Motormaster III controls to ensure proper cooling cycle operation at low-ambient temperatures. The fans controlled are those
that are energized with the lead compressor in each circuit. All
sizes use one controller per circuit. Refer to Fig. 18 for condenser fan staging information.

Low Cooler Suction Temperature — To avoid freezing the
cooler, the control will compare the circuit Cooler Suction temperature (T5/T6) with a predetermined freeze point. If the cooler fluid selected is Water, the freeze point is 34 F (1.1 C). If the
cooler fluid selected is Brine, the freeze point is 8° F (4.4 ° C)
below the cooling set point (or lower of two cooling set points
in dual set point configurations). If the cooler suction temperature is 24° to 29° F (13.3° to 16.1° C) below the cooler leaving
water temperature and is also 2° F (1.1° C) less than the freeze
point for 5 minutes, Mode 7 (Circuit A) or Mode 8 (Circuit B)
is initiated and no additional capacity increase is allowed. The
circuit will be allowed to run in this condition. If the cooler suction temperature is more than 30° F (16.7° C) below the cooler
leaving water temperature and is also 2° F (1.1° C) below the
freeze point for 10 minutes, the circuit will be stopped without
going through pumpdown.
Cooler Freeze Protection — The control will try to prevent
shutting the chiller down on a Cooler Freeze Protection alarm
by removing stages of capacity. The control uses the same
freeze point logic as described in the Low Cooler Suction Temperature section above. If the cooler leaving fluid temperature
is less than the freeze point plus 2.0° F (1.1° C), the control will
immediately remove one stage of capacity. This can be repeated once every 30 seconds.
MOP (Maximum Operating Pressure) Override — The control monitors saturated condensing and suction temperature for
each circuit. Based on a maximum operating set point (saturated suction temperature), the control may lower the EXV position when system pressures approach the set parameters.

Head Pressure Control
COMFORTLINK™ UNITS (With EXV) — The Main Base
Board (MBB) controls the condenser fans to maintain the lowest condensing temperature possible, and thus the highest unit
efficiency. The fans are controlled by the saturated condensing
temperature set from the factory. The fans can also be controlled by a combination of the saturated condensing temperature, EXV position and compressor superheat. Fan control is a
configurable decision and is determined by the Head Pressure
Control Method (HPCM) setting in the Configuration Mode
under the OPT1 sub-mode. For EXV control (HPCM = 1),
when the position of the EXV is fully open, T3 and T4 are less
than 78 F (25.6 C), and superheat is greater than 40 F (22.2 C),
fan stages will be removed. When the valve is less than 40%
open, or T3 and T4 are greater than 113 F (45 C), fan stages
will be added. At each change of the fan stage, the system will
wait one minute to allow the head pressure to stabilize unless
either T3 or T4 is greater than 125 F (51.6 C), in which case all
MBB-controlled fans will start immediately. This method
allows the unit to run at very low condensing temperatures at
part load.

Pumpout
EXV UNITS — When the lead compressor in each circuit is
started or stopped, that circuit goes through a pumpout cycle to
purge the cooler and refrigerant suction lines of refrigerant. If a
circuit is starting within 15 minutes of the last shutdown, the
pumpout cycle will be skipped.
The pumpout cycle starts immediately upon starting the
lead compressor and keeps the EXV at minimum position for
10 seconds. The EXV is then opened an additional percentage
and compressor superheat control begins. At this point, the
EXV opens gradually to provide a controlled start-up to prevent liquid flood-back to the compressor.
At shutdown, the pumpout cycle continuously closes the
EXV until all lag compressors are off and the EXV is at 0%.
The lead compressor continues to run for an additional 10 seconds and is then shut off.
TXV UNITS — Pumpout is based on timed pumpout. On a
command for start-up, the lead compressor starts. After 15 seconds, the liquid line solenoid opens. At shutdown, the liquid
line solenoid closes when the lead compressor has stopped.
27

FAN ARRANGEMENT
30GTN,R040-050
30GUN,R040-050

30GTN,R060-090, 230B, 245B
30GUN,R060-090, 230B, 245B

30GTN,R100,110, 255B-315B
30GUN,R100,110, 255B-315B

30GTN,R130 (60 Hz),
30GUN,R130 (60 Hz)
POWER

30GTN,R130 (50 Hz), 150-210,
230A-315A, 330A/B-420A/B†
30GUN,R130 (50 Hz), 150-210,
230A-315A, 330A/B-420A/B†
POWER

FAN
NO.

FAN RELAY

1

—

Compressor No. A1

2

—

Compressor No. B1

3

1

First Stage of Condenser Fans

4

2

Second Stage of Condenser Fans

1

—

Compressor No. A1

2

—

Compressor No. B1

3, 4

1

First Stage of Condenser Fans

5, 6

2

Second Stage of Condenser Fans

1

—

Compressor No. A1

2

—

Compressor No. B1

3, 4

1

First Stage of Condenser Fans

5, 6, 7, 8

2

Second Stage of Condenser Fans

5, 7

—

Compressor No. A1

6, 8

—

Compressor No. B1

1, 2

1

First Stage of Condenser Fans

3, 4, 9, 10

2

Second Stage of Condenser Fans

5, 7

—

Compressor No. A1

6, 8

—

Compressor No. B1

1, 11

1

First Stage of Condenser Fans, Circuit A

3, 9

2

Second Stage of Condenser Fans, Circuit A

2, 12

3

First Stage of Condenser Fans, Circuit B

4, 10

4

Second Stage of Condenser Fans, Circuit B

NORMAL CONTROL

*Control box.
†Fan numbers 11 and 12 do not apply to 30GTN,R and 30GUN,R 130-170 and associated modular units (see Table 1).

Fig. 18 — Condenser Fan Sequence

28

Marquee Display Usage (See Fig. 19 and
Tables 7-25) — The Marquee display module provides the

The Service Test function should be used to verify proper
operation of compressors, unloaders, hot gas bypass (if installed), cooler pump and remote alarm relays, EXVs and condenser fans. To use the Service Test mode, the Enable/Off/
Remote Contact switch must be in the OFF position. Use the
display keys and Table 9 to enter the mode and display TEST.
Press ENTER twice so that OFF flashes. Enter the password if
required. Use either arrow key to change the TEST value to the
On position and press ENTER . Switch the Enable/Off/Remote Contact switch to the Enable position (Version 2.3 and
later). Press ESCAPE and the
button to enter the OUTS
or COMP sub-mode.

user interface to the ComfortLink™ control system. The display has up and down arrow keys, an ESCAPE key, and an
ENTER key. These keys are used to navigate through the different levels of the display structure. See Table 7. Press the
ESCAPE key until the display is blank to move through the
top 11 mode levels indicated by LEDs on the left side of the
display.
Pressing the ESCAPE and ENTER keys simultaneously
will scroll a clear language text description across the display
indicating the full meaning of each display acronym. Pressing
the ESCAPE and ENTER keys when the display is blank
(Mode LED level) will return the Marquee display to its default
menu of rotating display items. In addition, the password will
be disabled requiring that it be entered again before changes
can be made to password protected items.

Test the condenser fan, cooler pump, and alarm relays by
changing the item values from OFF to ON. These discrete outputs are turned off if there is no keypad activity for 10 minutes.
Use arrow keys to select desired percentage when testing expansion valves. When testing compressors, the lead compressor must be started first. All compressor outputs can be turned
on, but the control will limit the rate by staging one compressor
per minute. Compressor unloaders and hot gas bypass relays/
solenoids (if installed) can be tested with compressors on or
off. The relays under the COMP sub-mode will stay on for
10 minutes if there is no keypad activity. Compressors will stay
on until they are turned off by the operator. The Service Test
mode will remain enabled for as long as there is one or more
compressors running. All safeties are monitored during this test
and will turn a compressor, circuit or the machine off if required. Any other mode or sub-mode can be accessed, viewed,
or changed during the TEST mode. The MODE item (Run Status mode under sub-mode VIEW) will display “0” as long as
the Service mode is enabled. The TEST sub-mode value must
be changed back to OFF before the chiller can be switched to
Enable or Remote contact for normal operation.

Clear language descriptions in English, Spanish, French, or
Portuguese can be displayed when properly configuring the
LANG variable in the Configuration mode, under DISP submode. See Table 16.
NOTE: When the LANG variable is changed to 1, 2, or 3, all
appropriate display expansions will immediately change to the
new language. No power-off or control reset is required when
reconfiguring languages.
When a specific item is located, the display will flash showing the operator, the item, followed by the item value and then
followed by the item units (if any). Press the ENTER key to
stop the display at the item value. Items in the Configuration
and Service Test modes are password protected. The display
will flash PASS and WORD when required. Use the ENTER
and arrow keys to enter the 4 digits of the password. The default password is 1111. The password can only be changed
through CCN devices such as ComfortWORKS® and Service
Tool.

Configuring and Operating Dual Chiller Control (See Table 18) — The dual chiller routine is available for the control of two units supplying chilled fluid on a
common loop. This control is designed for a parallel fluid flow
arrangement only. One chiller must be configured as the master
chiller, the other as the slave chiller. An additional leaving fluid
temperature thermistor (Dual Chiller LWT) must be installed
as shown in Fig. 20 and connected to the master chiller. See
Field Wiring section for Dual Chiller LWT sensor wiring.
To configure the two chillers for operation, follow the example shown in Table 18. The master chiller will be configured
with a slave chiller at address 6. Also in this example, the master chiller will be configured to use Lead/Lag Balance to even
out the chiller runtimes weekly. The Lag Start Delay feature
will be set to 10 minutes. The master and slave chillers cannot
have the same CCN address (CCNA, Configuration mode under OPT2). Both chillers must have the control method variable
(CTRL, Configuration mode under OPT2) set to ‘3.’ In addition, the chillers must both be connected together on the same
CCN bus. Connections can be made to the CCN screw terminals on TB3 in both chillers. The master chiller will determine
which chiller will be Lead and which will be Lag. The master
chiller controls the slave chiller by forcing the slave chiller’s
CCN START/STOP variable (CHIL_S_S), control point
(CTPT) and demand limit (DEM_LIM).
The master chiller is now configured for dual chiller operation. To configure the slave chiller, only the LLEN and MSSL
variables need to be set. Enable the Lead/Lag chiller enable
variable (LLEN) as shown Table 18. Similarly, set the Master/
Slave Select variable (MSSL) to SLVE. The variables LLBL,
LLBD, an LLDY are not used by the slave chiller.
Refer to Field Wiring section on page 67 for wiring
information.

Changing item values or testing outputs is accomplished in
the same manner. Locate and display the desired item. Press
ENTER to stop the display at the item value. Press the
ENTER key again so that the item value flashes. Use the arrow keys to change the value or state of an item and press the
ENTER key to accept it. Press the ESCAPE key and the
item, value, or units display will resume. Repeat the process as
required for other items.
See Tables 7-25 for further details.

Service Test (See Table 9) — Both main power and
control circuit power must be on.

MODE
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs

Alarm Status

Outputs
Configuration
Time Clock

ESCAPE

ENTER

Operating Modes
Alarms

Fig. 19 — Scrolling Marquee Display

29

RETURN
FLUID

THERMISTOR
WIRING*
LEAVING
FLUID

MASTER
CHILLER
SLAVE
CHILLER

INSTALL DUAL CHILLER
LEAVING FLUID
THERMISTOR (T9) HERE

*Depending on piping sizes, use either:
— HH79NZ014 sensor and 10HB50106801 well (3-in. sensor/well)
— HH79NZ029 sensor and 10HB50106802 well (4-in. sensor/well)

Fig. 20 — Dual Chiller Thermistor Location

Table 7 — Marquee Display Menu Structure
RUN
STATUS
Auto
Display
(VIEW)

SERVICE TEMPERATURES
TEST
Manual
Unit
Mode
Temperatures
On/Off
(UNIT)
(TEST)
Machine
Ckt A/B
Ckt A
Hours/Starts
Outputs
Temperatures
(RUN)
(OUTS)
(CIR.A)
Compressor Compressor
Ckt B
Run Hours
Tests
Temperatures
(HOUR)
(COMP)
(CIR.B)
Compressor
Starts
(STRT)
Software
Version
(VERS)

PRESSURES
Ckt A
Pressures
(PRC.A)
Ckt B
Pressures
(PRC.B)

SET
POINTS
Cooling
(COOL)

INPUTS

OUTPUTS

CONFIGURATION

Unit
Discrete
(GEN.I)

Unit
Discrete
(GEN.O)

Display
(DISP)

TIME
CLOCK
Unit Time
(TIME)

Heating
(HEAT)

Ckt A/B
(CRCT)

Ckt A
(CIR.A)

Machine
(UNIT)

Unit Date
(DATE)

Head
Pressure
(HEAD)

Unit
Analog
(4-20)

Ckt B
(CIR.B)

Options 1
(OPT1)

Schedule
(SCHD)

Options 2
(OPT2)
Temperature
Reset
(RSET)
Set Point
Select
(SLCT)

LEGEND
Ckt — Circuit

30

OPERATING
MODES
Modes
(MODE)

ALARMS
Current
(CRNT)
Reset
Alarms
(RCRN)
Alarm
History
(HIST)
Reset
History
(RHIS)

Table 8 — Run Status Mode and Sub-Mode Directory
SUB-MODE
VIEW

RUN

HOUR

STRT

VERS

KEYPAD
ENTRY

ITEM

RANGE

ITEM EXPANSION

ENTER

EWT

0 - 100 F
(–18 - 38 C)

ENTERING FLUID TEMP

LWT

0 - 100 F
(–18 - 38 C)

LEAVING FLUID TEMP

SETP

0 - 100 F
(–18 - 38 C)

ACTIVE SETPOINT

CTPT

0 - 100 F
(–18 - 38 C)

CONTROL POINT

STAT

0-7

CONTROL MODE

OCC

NO-YES

OCCUPIED

MODE

NO-YES

OVERRIDE MODE IN EFFECT

CAP

0 - 100%

PERCENT TOTAL CAPACITY

ENTER

ENTER

ENTER

ENTER

STGE

0 - 30

REQUESTED STAGE

ALRM

0 - 25

CURRENT ALARMS & ALERTS

TIME

00.00 - 23.59

TIME OF DAY

MNTH

1 - 12

MONTH OF YEAR

DATE

1 - 31

DAY OF MONTH

YEAR

0 - 9999

YEAR OF CENTURY

HRS.U

0 - 999999

MACHINE OPERATING HOURS

STR.U

0 - 999999

MACHINE STARTS

HRS.A

0 - 999999

CIRCUIT A RUN HOURS

HRS.B

0 - 999999

CIRCUIT B RUN HOURS

HR.A1

0 - 999999

COMPRESSOR A1 RUN HOURS

HR.A2

0 - 999999

COMPRESSOR A2 RUN HOURS

HR.A3

0 - 999999

COMPRESSOR A3 RUN HOURS

HR.A4

0 - 999999

COMPRESSOR A4 RUN HOURS

HR.B1

0 - 999999

COMPRESSOR B1 RUN HOURS

HR.B2

0 - 999999

COMPRESSOR B2 RUN HOURS

HR.B3

0 - 999999

COMPRESSOR B3 RUN HOURS

HR.B4

0 - 999999

COMPRESSOR B4 RUN HOURS

ST.A1

0 - 999999

COMPRESSOR A1 STARTS

ST.A2

0 - 999999

COMPRESSOR A2 STARTS

ST.A3

0 - 999999

COMPRESSOR A3 STARTS

ST.A4

0 - 999999

COMPRESSOR A4 STARTS

ST.B1

0 - 999999

COMPRESSOR B1 STARTS

ST.B2

0 - 999999

COMPRESSOR B2 STARTS

ST.B3

0 - 999999

COMPRESSOR B3 STARTS

ST.B4

0 - 999999

COMPRESSOR B4 STARTS

MBB

CESR-131170-XX-XX

EXV

CESR-131172-XX-XX

CXB

CESR-131173-XX-XX

EMM

CESR-131174-XX-XX

MARQ

CESR-131171-XX-XX

NAV

CESR-131227-XX-XX

31

COMMENT

0 = Service Test
1 = Off Local
2 = Off CCN
3 = Off Time Clock
4 = Off Emergency
5 = On Local
6 = On CCN
7 = On Time Clock

1 = Jan., 2 = Feb

Table 9 — Service Test Mode and Sub-Mode Directory
SUB-MODE

KEYPAD
ENTRY

TEST

ENTER

TEST

OFF-ON

SERVICE TEST MODE

ENTER

LLS.A

OPEN-CLSE

LIQ. LINE SOLENOID VALVE

EXV.A

0 - 100%

EXV % OPEN

OUTS

COMP

ENTER

ITEM

RANGE

ITEM EXPANSION

COMMENT
Use to Enable/Disable Manual Mode
TXV units only

LLS.B

OPEN-CLSE

LIQ. LINE SOLENOID VALVE

EXV.B

0 - 100%

EXV % OPEN

FAN1

OFF-ON

FAN 1 RELAY

Fan 3: (040-050)
Fans 3, 4: (060-110, 230B-315B)
Fans 1, 2: (130 [60 Hz])
Fans 1: (130 [50 Hz], 150, 170,
230A-270A, 330A/B, 360B [50 Hz])
Fans 1, 11: (190-210, 290A, 315A,
360A, 360B [60 Hz], 390A/B-420A/B)

FAN2

OFF-ON

FAN 2 RELAY

Fan 4: (040-050)
Fans 5, 6: (060-090, 230B-245B)
Fans 5, 6, 7, 8: (100, 110, 255B-315B)
Fans 3, 4, 9, 10: (130 [60 Hz])
Fan 2: (130 [50 Hz], 150, 170,
230A-270A, 330A/B, 360B [50 Hz])
Fans 2, 12: (190-210, 290A, 315A,
360A, 360B [60 Hz], 390A/B-420A/B)

FAN3

OFF-ON

FAN 3 RELAY

Fans 3, 9: (130 [50 Hz], 150-210,
230A-315A, 330A/B-420A/B)

FAN4

OFF-ON

FAN 4 RELAY

Fans 4, 10: (130 [50 Hz], 150-210,
230A-315A, 330A/B-420A/B)

CLR.P

OFF-ON

COOLER PUMP RELAY

CND.P

OFF-ON

CONDENSER PUMP RELAY

RMT.A

OFF-ON

REMOTE ALARM RELAY

CC.A1

OFF-ON

COMPRESSOR A1 RELAY

CC.A2

OFF-ON

COMPRESSOR A2 RELAY

CC.A3

OFF-ON

COMPRESSOR A3 RELAY

CC.A4

OFF-ON

COMPRESSOR A4 RELAY

UL.A1

OFF-ON

UNLOADER A1 RELAY

UL.A2

OFF-ON

UNLOADER A2 RELAY

HGBP

OFF-ON

HOT GAS BYPASS RELAY

CC.B1

OFF-ON

COMPRESSOR B1 RELAY

CC.B2

OFF-ON

COMPRESSOR B2 RELAY

CC.B3

OFF-ON

COMPRESSOR B3 RELAY

CC.B4

OFF-ON

COMPRESSOR B4 RELAY

UL.B1

OFF-ON

UNLOADER B1 RELAY

UL.B2

OFF-ON

UNLOADER B2 RELAY

LEGEND
EXV — Electronic Expansion Valve

32

TXV units only

Table 10 — Temperature Mode and Sub-Mode Directory
SUB-MODE
UNIT

KEYPAD
ENTRY

ITEM

RANGE

ITEM EXPANSION

ENTER

CEWT

–40 - 245 F
(–40 - 118 C)

COOLER ENTERING FLUID

CLWT

–40 - 245 F
(–40 - 118 C)

COOLER LEAVING FLUID

OAT

–40 - 245 F
(–40 - 118 C)

OUTSIDE AIR TEMPERATURE

SPT

–40 - 245 F
(–40 - 118 C)

SPACE TEMPERATURE

CNDE

–40 - 245 F
(–40 - 118 C)

CONDENSER ENTERING FLUID

CNDL

–40 - 245 F
(–40 - 118 C)

CONDENSER LEAVING FLUID

DLWT

–40 - 245 F
(–40 - 118 C)

LEAD/LAG LEAVING FLUID

CIR.A
ENTER

SCT.A

–40 - 245 F
(–40 - 118 C)

SATURATED CONDENSING TMP

SST.A

–40 - 245 F
(–40 - 118 C)

SATURATED SUCTION TEMP

SGT.A

–40 - 245 F
(–40 - 118 C)

COMPRESSOR SUCTION GAS TEMP

SUP.A

–40 - 245 ∆ F
(–40 - 118 ∆ C)

SUCTION SUPERHEAT TEMP

SCT.B

–40 - 245 F
(–40 - 118 C)

SATURATED CONDENSING TMP

SST.B

–40 - 245 F
(–40 - 118 C)

SATURATED SUCTION TEMP

SGT.B

–40 - 245 F
(–40 - 118 C)

COMPRESSOR SUCTION GAS TEMP

SUP.B

–40 - 245 ∆ F
(–40 - 118 ∆ C)

SUCTION SUPERHEAT TEMP

CIR.B
ENTER

COMMENT

Table 11 — Pressure Mode and Sub-Mode Directory
SUB-MODE

KEYPAD ENTRY

ITEM

RANGE

ITEM EXPANSION

PRC.A

ENTER

DP.A

0-900
Psig

DISCHARGE PRESSURE

Pressure is converted from SCT.A.

SP.A

0-900
Psig

SUCTION PRESSURE

Pressure is converted from SST.A.

DP.B

0-900
Psig

DISCHARGE PRESSURE

Pressure is converted from SCT.B.

SP.B

0-900
Psig

SUCTION PRESSURE

Pressure is converted from SST.B.

PRC.B

ENTER

COMMENT

Table 12 — Set Point Mode and Sub-Mode Directory
SUB-MODE
COOL

KEYPAD
ENTRY

ITEM

RANGE

ITEM EXPANSION

ENTER

CSP.1

–20 - 70 F
(–29 - 21 C)

COOLING SETPOINT 1

Default 44 F

CSP.2

–20 - 70 F
(–29 - 21 C)

COOLING SETPOINT 2

Default 44 F

CSP.3

–20 - 32 F
(–29 - 0° C)

ICE SETPOINT

Default 32 F

HSP.1

80 - 140 F
(27 - 60 C)

HEATING SETPOINT 1

Not Supported

HSP.2

80 - 140 F
(27 - 60 C)

HEATING SETPOINT 2

Not Supported

HD.P.A

80 - 140 F
(27 - 60 C)

HEAD PRESSURE SETPOINT A

Default 113 F

HD.P.B

80 - 140 F
(27 - 60 C)

HEAD PRESSURE SETPOINT B

Default 113 F

HEAT

HEAD

ENTER

33

COMMENT

Table 13 — Reading and Changing Chilled Fluid Set Point
SUB-MODE

KEYPAD ENTRY

ITEM

DISPLAY

RANGE

ITEM EXPANSION

ENTER

CSP.1

44.0 °F

–20-70 F

COOLING SETPOINT 1

ENTER

44.0 °F

–20-70 F

Scrolling stops

ENTER

44.0 °F

–20-70 F

Value flashes

–20-70 F

Select 46.0

ENTER

46.0 °F

–20-70 F

Change accepted

46.0 °F

–20-70 F

COOL

ENTER

CSP.1

COOLING SETPOINT 1

COMMENT
Default: 44 F
38-70 F Flud = 1
14-70 F Flud = 2
–20-70 F Flud = 3

Item/Value/Units scrolls again

Table 14 — Inputs Mode and Sub-Mode Directory
SUB-MODE
GEN.I

CRCT

4-20

KEYPAD
ENTRY

ITEM

RANGE

ITEM EXPANSION

ENTER

STST

STRT-STOP

START/STOP SWITCH

ENTER

ENTER

FLOW

OFF-ON

COOLER FLOW SWITCH

CND.F

OFF-ON

CONDENSER FLOW SWITCH

DLS1

OFF-ON

DEMAND LIMIT SWITCH 1

DLS2

OFF-ON

DEMAND LIMIT SWITCH 2

ICED

OFF-ON

ICE DONE

DUAL

OFF-ON

DUAL SETPOINT SWITCH

FKA1

OFF-ON

COMPRESSOR A1 FEEDBACK

FKA2

OFF-ON

COMPRESSOR A2 FEEDBACK

FKA3

OFF-ON

COMPRESSOR A3 FEEDBACK

FKA4

OFF-ON

COMPRESSOR A4 FEEDBACK

OIL.A

OPEN-CLSE

OIL PRESSURE SWITCH A

LPS.A

OPEN-CLSE

LOW PRESSURE SWITCH

FKB1

OFF-ON

COMPRESSOR B1 FEEDBACK

FKB2

OFF-ON

COMPRESSOR B2 FEEDBACK

FKB3

OFF-ON

COMPRESSOR B3 FEEDBACK

FKB4

OFF-ON

COMPRESSOR B4 FEEDBACK

OIL.B

OPEN-CLSE

OIL PRESSURE SWITCH B

LPS.B

OPEN-CLSE

LOW PRESSURE SWITCH

DMND

0 - 24 mA

4-20 mA DEMAND SIGNAL

RSET

0 - 24 mA

4-20 mA RESET SIGNAL

CSP

0 - 24 mA

4-20 mA COOLING SETPOINT

HSP

0 - 24 mA

4-20 mA HEATING SETPOINT

34

COMMENT
Enable/Off/Remote
Contact Switch Input

Not applicable (040-420)

Not applicable (040-420)

Table 15 — Outputs Mode and Sub-Mode Directory
SUB-MODE

KEYPAD
ENTRY

ITEM

RANGE

ITEM EXPANSION

GEN.O

ENTER

FAN1

OFF-ON

FAN 1 RELAY

FAN2

OFF-ON

FAN 2 RELAY

FAN3

OFF-ON

FAN 3 RELAY

FAN4

OFF-ON

FAN 4 RELAY

C.PMP

OFF-ON

COOLER PUMP RELAY

H.GAS

OFF-ON

HOT GAS BYPASS RELAY

CIR.A

ENTER

CIR.B

EXV
TXV

—
—

ENTER

CNDP

OFF-ON

CONDENSER PUMP RELAY

CC.A1

OFF-ON

COMPRESSOR A1 RELAY

CC.A2

OFF-ON

COMPRESSOR A2 RELAY

CC.A3

OFF-ON

COMPRESSOR A3 RELAY

CC.A4

OFF-ON

COMPRESSOR A4 RELAY

ULA1

OFF-ON

UNLOADER A1 RELAY

COMMENT

ULA2

OFF-ON

UNLOADER A2 RELAY

TXV units only

LLS.A

OPEN-CLSE

LIQUID LINE SOLENOID VLV

EXV units only

EXV.A

0 - 100%

EXV % OPEN

CC.B1

OFF-ON

COMPRESSOR B1 RELAY

CC.B2

OFF-ON

COMPRESSOR B2 RELAY

CC.B3

OFF-ON

COMPRESSOR B3 RELAY

CC.B4

OFF-ON

COMPRESSOR B4 RELAY

ULB1

OFF-ON

UNLOADER B1 RELAY

ULB2

OFF-ON

UNLOADER B2 RELAY

LLS.B

OPEN-CLSE

LIQUID LINE SOLENOID VLV

TXV units only

EXV.B

0 - 100%

EXV % OPEN

EXV units only

LEGEND
Electronic Expansion Valve
Thermostatic Expansion Valve

Table 16 — Configuration Mode and Sub-Mode Directory
SUB-MODE
DISP

CCN
EMM
EXV
LCW

—
—
—
—

KEYPAD
ENTRY

ITEM

MARQUEE
DISPLAY RANGE

NAVIGATOR
DISPLAY RANGE

ITEM EXPANSION

ENTER

TEST

OFF-ON

OFF-ON

TEST DISPLAY
LEDS

METR

OFF-ON

OFF-ON

METRIC DISPLAY

LANG

0-3

ENGLISH
ESPANOL
FRANCAIS
PORTUGUES

LANGUAGE
SELECTION

LEGEND
Carrier Comfort Network
Energy Management Module
Electronic Expansion Valve
Leaving Chilled Water

35

COMMENT

Off = English
On = Metric
Default: 0
0 = English
1 = Espanol
2 = Francais
3 = Portugues

Table 16 — Configuration Mode and Sub-Mode Directory (cont)
SUB-MODE
UNIT

OPT1

OPT2

CCN
EMM
EXV
LCW

—
—
—
—

KEYPAD
ENTRY
ENTER

ENTER

ENTER

MARQUEE
DISPLAY RANGE

NAVIGATOR
DISPLAY RANGE

TYPE

1-5

AIR COOLED
WATER COOLED
SPLIT
HEAT MACHINE
HEAT RECLAIM

UNIT TYPE

TONS

15 - 300

15 - 300

UNIT SIZE

CAP.A

0 - 100%

0 - 100%

CIRCUIT A % CAPACITY

CMP.A

1-4

1-4

NUMBER CIRC A COMPRESSOR

CYL.A

4, 6

4, 6

COMPRESSOR A1 CYLINDERS

CMP.B

1-4

1-4

NUMBER CIRC B COMPRESSOR

ITEM

ITEM EXPANSION

COMMENT
Default: 1
1 = Air Cooled
2 = Water Cooled
3 = Split System
4 = Heat Machine
5 = Heat Reclaim

CYL.B

4, 6

4, 6

COMPRESSOR B1 CYLINDERS

EXV

NO-YES

NO-YES

EXV MODULE INSTALLED

SH.SP

10 - 40 ∆ F
(6 - 22 ∆ C)

10 - 40 ∆ F
(6 - 22 ∆ C)

EXV SUPERHEAT SETPOINT

SH.OF

–20 - 20 ∆ F
(–11 - 11 ∆ C)

–20 - 20 ∆ F
(–11 - 11 ∆ C)

EXV SUPERHEAT OFFSET

REFG

1, 2

1, 2

REFRIGERANT

FAN.S

1-4

2 STAGE IND
3 STAGE IND
2 STAGE COM
3 STAGE COM

FAN STAGING SELECT

FLUD

1-3

1-3

COOLER FLUID

HGB.S

NO-YES

NO-YES

HOT GAS BYPASS SELECT

HPCM

1-4

EXV CONTROL
SETPOINT CONTROL
SET A EXV B
EXV A SET B

HEAD PRESS. CONT. METHOD

Default:2
1 = EXV Control
2 = Set Point Control
3 = Set Point Circuit A, EXV Circuit B
4 = Set Point Circuit B, EXV Circuit A

HPCT

0-2

NO CONTROL
AIR COOLED
WATER COOLED

HEAD PRESS. CONTROL TYPE

Default: 1
0 = No Control
1 = Air Cooled
2 = Water Cooled

MMR.S

NO-YES

NO-YES

MOTORMASTER SELECT

PRTS

NO-YES

NO-YES

PRESSURE
TRANSDUCERS

Default
29 = 30GTN,R
23 = 30GUN,R
Default: 0
1 = R-22 (30GTN,R)
2 = R-134a (30GUN,R)
1 = 2 Stage Independent
2 = 3 Stage Independent
3 = 2 Stage Common
4 = 3 Stage Common (Not supported
for air cooled)
1 = Water
2 = Med. Brine
3 = Low Brine

Default: NO
Not Supported

PMP.I

OFF-ON

OFF-ON

COOLER PUMP INTERLOCK

Default: ON

CPC

OFF-ON

OFF-ON

COOLER PUMP CONTROL

Default: OFF

CNP.I

OFF-ON

OFF-ON

CONDENSER PUMP INTERLOCK

CNPC

0-2

NO CONTROL
ON WITH MODE
ON WITH COMP

CONDENSER PUMP CONTROL

CWT.S

NO-YES

NO-YES

CONDENSER FLUID SENSORS

CA.UN

0-2

0-2

NO. CIRCUIT A UNLOADERS

CB.UN

0-2

0-2

NO. CIRCUIT B UNLOADERS

Default: OFF
Not Applicable
Default: 0
0 = Not Controlled
1 = On with Occupied Mode
2 = On with Compressors
Default: NO
Not Applicable

EMM

NO-YES

NO-YES

EMM MODULE INSTALLED

CTRL

0-3

SWITCH
7 DAY OCC
OCCUPANCY
CCN

CONTROL METHOD

CCNA

1 - 239

1 - 239

CCN ADDRESS

Default: 1

CCNB

0 - 239

0 - 239

CCN BUS NUMBER

Default: 0

LEGEND
Carrier Comfort Network
Energy Management Module
Electronic Expansion Valve
Leaving Chilled Water

36

0 = Switch
1 = 7-Day Schedule
2 = Occupancy Schedule
3 = CCN

Table 16 — Configuration Mode and Sub-Mode Directory (cont)
SUB-MODE

KEYPAD
ENTRY

OPT2
(cont)

ITEM

MARQUEE
DISPLAY RANGE

NAVIGATOR
DISPLAY RANGE

ITEM EXPANSION

BAUD

1-5

2400

CCN BAUD RATE

Default: 3
1 = 2400
2 = 4800
3 = 9600
4 = 19,200
5 = 38,400

LOAD

1-2

EQUAL
STAGED

LOADING SEQUENCE
SELECT

Default: 1
1 = Equal
2 = Staged

LLCS

1-3

AUTOMATIC
CIR A LEADS
CIR B LEADS

LEAD/LAG CIRCUIT
SELECT

LCWT

2 - 60 ∆ F
(–16 - 16 ∆ C)

2 - 60 ∆ F
(–16 - 16 ∆ C)

HIGH LCW ALERT
LIMIT

Default: 60

DELY

0 - 15

0 - 15

MINUTES OFF TIME

Default: 0

ICE.M

ENBL-DSBL

ENBL-DSBL

ICE MODE ENABLE

Default: DSBL

CRST

0-4

NO RESET
4-20 INPUT
OUT AIR TEMP
RETURN FLUID
SPACE TEMP

COOLING RESET
TYPE

0 = No report
2 = 4 to 20 mA input
3 = Return fluid
4 = Space temperature

CRT1

0° - 125 F
(–18 - 52 C)

0° - 125 F
(–18 - 52 C)

NO COOL RESET
TEMP

Default: 125 F

CRT2

0° - 125 F
(–18 - 52 C)

0° - 125 F
(–18 - 52 C)

FULL COOL RESET
TEMP

Default: 0° F

DGRC

–30 - 30 ∆ F
(–17 - 17 ∆ C)

–30 - 30 ∆ F
(–17 - 17 ∆ C)

DEGREES COOL
RESET

Default: 0° F

HRST

0-4

0-4

HEATING RESET
TYPE

Not Supported

HRT1

0° - 125 F
(–18 - 52 C)

0° - 125 F
(–18 - 52 C)

NO HEAT RESET
TEMP

Not Supported

HRT2

0° - 125 F
(–18 - 52 C)

0° - 125 F
(–18 - 52 C)

FULL HEAT RESET
TEMP

Not Supported

DGRH

–30 - 30 ∆ F
(–17 - 17 ∆ C)

–30 - 30 ∆ F
(–17 - 17 ∆ C)

DEGREES HEAT
RESET

Not Supported

DMDC

0-3

0-3

DEMAND LIMIT
SELECT

Default: 0

DM20

0 - 100%

0 - 100%

DEMAND LIMIT
AT 20 mA

Default: 100%

SHNM

0 - 99

0 - 99

LOADSHED GROUP
NUMBER

Default: 0

SHDL

0 - 60%

0 - 60%

LOADSHED DEMAND
DELTA

Default: 0

SHTM

0 - 120

0 - 120

MAXIMUM LOADSHED
TIME

Default: 60 minutes

DLS1

0 - 100%

0 - 100%

DEMAND LIMIT
SWITCH 1

Default: 80%

DLS2

0 - 100%

0 - 100%

DEMAND LIMIT
SWITCH 2

Default: 50%

LLEN

ENBL-DSBL

ENBL-DSBL

LEAD/LAG CHILLER
ENABLE

Default: DSBL

MSSL

SLVE-MAST

SLVE-MAST

MASTER/SLAVE
SELECT

Default: Master

SLVA

0 - 239

0 - 239

SLAVE ADDRESS

LLBL

ENBL-DSBL

ENBL-DSBL

LEAD/LAG BALANCE
SELECT

Default: DSBL

LLBD

40 - 400HRS

40 - 400HRS

LEAD/LAG BALANCE
DELTA

Default: 168 hours

LLDY

0 - 30 MIN

0 - 30 MIN

LAG START DELAY

Default: 5 minutes

RSET
ENTER

4800
9600
19,200
38,400

37

COMMENT

Default: 1 (Size 080-420);
2 (Size 040-070)
1 = Automatic
2 = Circuit A Leads
3 = Circuit B Leads

Default: 0

Table 16 — Configuration Mode and Sub-Mode Directory (cont)
SUB-MODE
SLCT

KEYPAD
ENTRY

ITEM

MARQUEE
DISPLAY RANGE

NAVIGATOR
DISPLAY RANGE

ENTER

CLSP

0-5

DUAL SWITCH
DUAL 7 DAY
DUAL CCN OCC
4-20 INPUT
EXTERNAL POT

COOLING SETPOINT
SELECT

HTSP

0-4

0-4

HEATING SETPOINT SELECT

Not Supported

RL.S

ENBL-DSBL

ENBL-DSBL

RAMP LOAD SELECT

Default: DSBL

CRMP

0.2 - 2.0° F
(0.1 - 1.1° C)

0.2 - 2.0° F
(0.1 - 1.1° C)

COOLING RAMP LOADING

Default: 1.0

HRMP

0.2 - 2.0° F
(0.1 - 1.1° C)

0.2 - 2.0° F
(0.1 - 1.1° C)

HEATING RAMP LOADING

Not Supported

HCSW

COOL-HEAT

COOL-HEAT

HEAT COOL SELECT

Not Supported

Z.GN

1.0 - 4.0

1.0 - 4.0

DEADBAND MULTIPLIER

ITEM EXPANSION

COMMENT
Default: 0
0 = Single
1 = Dual Switch
2 = Dual 7 Day
3 = Dual CCN Occupancy
4 = 4-20 Input
5 = Set Point Potentiometer

Default: 1.0

Table 17 — Example of Temperature Reset (Return Fluid) Configuration
SUB-MODE
RSET

KEYPAD
ENTRY
ENTER

ITEM

DISPLAY

ITEM EXPANSION

CRST

0

COOLING RESET TYPE

COMMENT
0 = No reset
1 = 4 to 20 mA input
2 = Outdoor Air Temp
3 = Return Fluid
4 = Space Temperature

ENTER

0

Scrolling stops

ENTER

0

Value flashes

3

Select 3

3

Change accepted

CRST

3

Item/Value/Units scrolls again

CRT1

125

ENTER

ENTER

NO COOL RESET TEMP

Range: 0° to 125 F

ENTER

125

Scrolling stops

ENTER

125

Value flashes

10

Select 10

10

Change accepted

CRT1

10

Item/Value/Units scrolls again

CRT2

0

ENTER

ESCAPE

FULL COOL RESET TEMP

Range: 0° to 125 F

ENTER

0

Scrolling stops

ENTER

0

Value flashes

2

Select 2

2

Change accepted

CRT2

2

Item/Value/Units scrolls again

DGRC

0

ENTER

ESCAPE

DEGREES COOL RESET

Range: –30 to 30 F

ENTER

0

Scrolling stops

ENTER

0

Value flashes

8

Select 8

8

Change accepted

8

Item/Value/Units scrolls again

ENTER

ESCAPE

DGRC

NOTE: The example above shows how to configure the chiller for temperature reset based on chiller return fluid. The
chiller will be configured for no reset at a cooler ∆T (EWT-LWT) of 10 F (5.6 C) and a full reset of 8 F (4.4 C) at a cooler ∆T
of 2 F (1.1 C).

38

Table 18A — Example of Configuring Dual Chiller Control
(Master Chiller)
SUB-MODE
RSET

KEYPAD ENTRY

ITEM

DISPLAY

ITEM EXPANSION

ENTER

CRST

0

COOLING RESET TYPE

LLDY

5

LAG START DELAY

COMMENT

ENTER

5

Scrolling stops

ENTER

5

Value flashes

10

Select 10

10

Change accepted

ENTER

ESCAPE

LLDY

10

LLBD

168

LEAD/LAG BALANCE DELTA

LLBL

DSBL

LEAD/LAG BALANCE SELECT

No change needed. Default set for weekly changeover

ENTER

DSBL

Scrolling stops

ENTER

DSBL

Value flashes

ENBL

Select Enable

ENBL

Change accepted

ENTER

ESCAPE

LLBL

ENBL

SLVA

0

SLAVE ADDRESS

ENTER

0

Scrolling stops

ENTER

0

Value flashes

6

Select 6

6

Change accepted

ENTER

ESCAPE

SLVA

6

MSSL

MAST

MASTER/SLAVE SELECT

No change needed. Default set for Master

Table 18B — Example of Configuring Dual Chiller Control
(Slave Chiller)
SUB-MODE
RSET

KEYPAD ENTRY

ITEM

DISPLAY

ITEM EXPANSION

ENTER

CRST

0

COOLING RESET TYPE

LLDY

5

LAG START DELAY

LLBD

168

LEAD/LAG BALANCE DELTA

LLBL

DSBL

LEAD/LAG BALANCE SELECT

SLVA

0

SLAVE ADDRESS

MSSL

MAST

MASTER/SLAVE SELECT

COMMENT

No change needed. Default set for weekly changeover

Default set for Master

ENTER

MAST

Scrolling stops

ENTER

MAST

Value flashes

SLVE

Select SLVE

SLVE

Change accepted

MSSL

Item/Value/Units scrolls again

ENTER

LLEN

DSBL

LEAD/LAG CHILLER ENABLE

ENTER

DSBL

Scrolling stops

ENTER

DSBL

Value flashes

ENBL

Select enable
Change accepted

ENTER

LLEN

ENBL

ESCAPE

LLEN

ENBL

LEAD/LAG CHILLER ENABLE

39

Item/Value/Units scrolls again

Table 19 — Example of Compressor Lead/Lag Configuration
SUB-MODE

KEYPAD
ENTRY

ITEM

DISPLAY

ITEM EXPANSION

OPT2

ENTER

CTRL

0

CONTROL METHOD

CCNA

1

CCNB

0

BAUD

3

LOAD

1

LLCS

1

COMMENT

LEAD/LAG CIRCUIT SELECT

DEFAULT: 1 (Size 080-420)
2 (Size 040-070)

ENTER

1

Scrolling stops

ENTER

1

Value flashes

3

Select 3 (See note below)

3

ENTER

LLCS

ESCAPE

3

1 = Automatic
2 = Circuit A Leads
3 = Circuit B Leads

Change accepted
LEAD/LAG CIRCUIT SELECT

Item/Value/Units scrolls again

NOTE: Options 1 and/or 3 not valid for sizes 040-070 without Circuit B accessory unloader installed.

Table 20 — Time Clock Mode and Sub-Mode Directory
SUB-MODE

KEYPAD ENTRY

ITEM

ITEM
RANGE

ITEM EXPANSION

TIME

ENTER

HH.MM

00.00 - 23.59

HOUR AND MINUTE

DATE

ENTER

MNTH

1 - 12

MONTH

DOM

1 - 31

DATE OF MONTH

DAY

1-7

DAY OF WEEK

YEAR

0000 - 9999

YEAR OF CENTURY

MON.O

00.00 - 23.59

MONDAY OCCUPIED TIME

Default: 00.00

MON.U

00.00 - 23.59

MONDAY UNOCCUPIED TIME

Default: 00.00

TUE.O

00.00 - 23.59

TUESDAY OCCUPIED TIME

Default: 00.00

TUE.U

00.00 - 23.59

TUESDAY UNOCCUPIED TIME

Default: 00.00

WED.O

00.00 - 23.59

WEDNESDAY OCCUPIED TIME

Default: 00.00

WED.U

00.00 - 23.59

WEDNESDAY UNOCC TIME

Default: 00.00

THU.O

00.00 - 23.59

THURSDAY OCCUPIED TIME

Default: 00.00

THU.U

00.00 - 23.59

THURSDAY UNOCCUPIED TIME

Default: 00.00

FRI.O

00.00 - 23.59

FRIDAY OCCUPIED TIME

Default: 00.00

FRI.U

00.00 - 23.59

FRIDAY UNOCCUPIED TIME

Default: 00.00

SAT.O

00.00 - 23.59

SATURDAY OCCUPIED TIME

Default: 00.00

SAT.U

00.00 - 23.59

SATURDAY UNOCCUPIED TIME

Default: 00.00

SUN.O

00.00 - 23.59

SUNDAY OCCUPIED TIME

Default: 00.00

SUN.U

00.00 - 23.59

SUNDAY UNOCCUPIED TIME

Default: 00.00

SCHD

ENTER

40

COMMENT
Military (00.00-23.59)
1=Jan, 2=Feb, etc.

1=Mon, 2=Tue, etc.

Table 21 — Setting an Occupied Time Schedule
SUB-MODE
SCHD

KEYPAD ENTRY

ITEM

DISPLAY

ITEM EXPANSION

ENTER

MON.O

00.00

MONDAY OCCUPIED TIME

COMMENT
TIME IN MILITARY FORMAT (HH.MM)

ENTER

00.00

Scrolling stops

ENTER

00.00

Hours flash

07.00

Select 7 AM

07.00

Change accepted, minutes flash

07.30

Select 30

07.30

Change accepted

ENTER

ENTER

MON.O

ESCAPE

07.30

MONDAY OCCUPIED TIME

Item/Value/Units scrolls again

Table 22 — Operating Mode and Sub-Mode Directory
SUB-MODE
MODE

KEYPAD ENTRY

ITEM

RANGE

ITEM EXPANSION

ENTER

MD01

OFF-ON

FSM CONTROLLING CHILLER

MD02

OFF-ON

WSM CONTROLLING CHILLER

MD03

OFF-ON

MASTER/SLAVE CONTROL

MD04

OFF-ON

LOW SOURCE PROTECTION

MD05

OFF-ON

RAMP LOAD LIMITED

MD06

OFF-ON

TIMED OVERRIDE IN EFFECT

MD07

OFF-ON

LOW COOLER SUCTION TEMPA

MD08

OFF-ON

LOW COOLER SUCTION TEMPB

MD09

OFF-ON

SLOW CHANGE OVERRIDE

MD10

OFF-ON

MINIMUM OFF TIME ACTIVE

MD11

OFF-ON

LOW SUCTION SUPERHEAT A

MD12

OFF-ON

LOW SUCTION SUPERHEAT B

MD13

OFF-ON

DUAL SETPOINT

MD14

OFF-ON

TEMPERATURE RESET

MD15

OFF-ON

DEMAND LIMIT IN EFFECT

MD16

OFF-ON

COOLER FREEZE PROTECTION

MD17

OFF-ON

LO TMP COOL/HI TMP HEAT

MD18

OFF-ON

HI TMP COOL/LO TMP HEAT

MD19

OFF-ON

MAKING ICE

MD20

OFF-ON

STORING ICE

MD21

OFF-ON

HIGH SCT CIRCUIT A

MD22

OFF-ON

HIGH SCT CIRCUIT B

LEGEND
FSM — Flotronic™ System Manager
SCT — Saturated Condensing Temperature
WSM — Water System Manager

41

COMMENT

Not Supported

Table 23 — Operating Modes
MODE NO.
01
02
03
04
05

ITEM EXPANSION
FSM CONTROLLING CHILLER
WSM CONTROLLING CHILLER
MASTER/SLAVE CONTROL
LOW SOURCE PROTECTION
RAMP LOAD LIMITED

06

TIMED OVERRIDE IN EFFECT

07

LOW COOLER SUCTION TEMP A

08

LOW COOLER SUCTION TEMP B

09

SLOW CHANGE OVERRIDE

10

MINIMUM OFF TIME ACTIVE

11

LOW SUCTION SUPERHEAT A

12

LOW SUCTION SUPERHEAT B

13

DUAL SET POINT

14

TEMPERATURE RESET

15

DEMAND LIMIT IN EFFECT

16

COOLER FREEZE PROTECTION

17

LO TMP COOL/HI TMP HEAT

18

HI TMP COOL/LO TMP HEAT

19

MAKING ICE

20

STORING ICE

21

HIGH SCT CIRCUIT A

22

HIGH SCT CIRCUIT B

DESCRIPTION
Flotronic™ System Manager (FSM) is controlling the chiller.
Water System Manager (WSM) is controlling the chiller.
Lead/Lag Chiller control is enabled.
Not currently supported.
Ramp load (pulldown) limiting in effect. In this mode, the rate at which leaving
fluid temperature is dropped is limited to a predetermined value to prevent
compressor overloading. See CRMP set point in the Set Point Select (SLCT)
section of the Configuration mode. The pulldown limit can be modified, if
desired, to any rate from 0.2° F to 2° F (0.1° to 1° C)/minute.
Timed override is in effect. This is a 1 to 4 hour temporary override of the
programmed schedule, forcing unit to Occupied mode. Override can be
implemented with unit under Local (Enable) or CCN control. Override
expires after each use.
Circuit A capacity may be limited due to operation of this mode. Control will
attempt to correct this situation for up to 10 minutes before shutting the circuit down. The control may decrease capacity when attempting to correct
this problem. See Alarms and Alerts section for more information.
Circuit B capacity may be limited due to operation of this mode. Control will
attempt to correct this situation for up to10 minutes before shutting the circuit down. The control may decrease capacity when attempting to correct
this problem. See Alarms and Alerts section for more information.
Slow change override is in effect. The leaving fluid temperature is close to
and moving towards the control point.
Chiller is being held off by Minutes Off Time (DELY) found under Options 2
(OPT2) section of Configuration mode.
Circuit A capacity may be limited due to operation of this mode. Control will
attempt to correct this situation for up to 5 minutes before shutting the circuit down. See Alarms and Alerts section for more information.
Circuit B capacity may be limited due to operation of this mode. Control will
attempt to correct this situation for up to 5 minutes before shutting the circuit down. See Alarms and Alerts section for more information.
Dual set point mode is in effect. Chiller controls to CSP.1 during occupied
periods and CSP.2 during unoccupied periods. Both CSP.1 and CSP.2 are
located under COOL in the Set Point mode.
Temperature reset is in effect. In this mode, chiller is using temperature
reset to adjust leaving fluid set point upward and is currently controlling to
the modified set point. The set point can be modified based on return fluid,
outdoor-air-temperature, space temperature, or 4 to 20 mA signal.
Demand limit is in effect. This indicates that the capacity of the chiller
is being limited by demand limit control option. Because of this limitation,
the chiller may not be able to produce the desired leaving fluid temperature.
Demand limit can be controlled by switch inputs or a 4 to 20 mA signal.
Cooler fluid temperatures are approaching the Freeze point (see Alarms
and Alerts section for definition). The chiller will be shut down when either
fluid temperature falls below the Freeze point.
Chiller is in Cooling mode and the rate of change of the leaving fluid is negative and decreasing faster than -0.5° F per minute. Error between leaving
fluid and control point exceeds fixed amount. Control will automatically
unload the chiller if necessary.
Chiller is in Cooling mode and the rate of change of the leaving fluid is positive
and increasing. Error between leaving fluid and control point exceeds fixed
amount. Control will automatically load the chiller if necessary to better match
the increasing load.
Chiller is in an unoccupied mode and is using Ice Set Point 3 (CSP.3) to make
ice. The ice done input to the Energy Management Module (EMM) is open.
Chiller is in an unoccupied mode and is controlling to Cooling Set Point 2
(CSP.2). The ice done input to the Energy Management Module (EMM) is
closed.
Chiller is in a cooling mode and the Saturated Condensing temperature read
by sensor T3 is greater than 140 F (60 C). No additional stages of capacity
will be added. Chiller may be unloaded if SCT continues to rise to avoid highpressure switch trips by reducing condensing temperature.
Chiller is in a cooling mode and the Saturated Condensing temperature read
by sensor T4 is greater than 140 F (60 C). No additional stages of capacity
will be added. Chiller may be unloaded if SCT continues to rise to avoid highpressure switch trips by reducing condensing temperature.

42

Table 24 — Alarms Mode and Sub-Mode Directory
SUB-MODE

KEYPAD ENTRY

ITEM

ITEM EXPANSION

COMMENT

CRNT

ENTER

AXXX or TXXX

CURRENTLY ACTIVE ALARMS

RCRN

ENTER

YES/NO

RESET ALL CURRENT ALARMS

HIST

ENTER

AXXX or TXXX

ALARM HISTORY

RHIS

ENTER

YES/NO

RESET ALARM HISTORY

Alarms are shown as AXXX.
Alerts are shown as TXXX.

Alarms are shown as AXXX.
Alerts are shown as TXXX.

Table 25 — Example of Reading and Clearing Alarms
SUB-MODE

KEYPAD
ENTRY

CRNT

ENTER

CRNT

ESCAPE

RCRN
ENTER

ENTER

ITEM

ITEM EXPANSION

COMMENT

AXXX or TXXX

CURRENTLY ACTIVE ALARMS

ACTIVE ALARMS (AXXX) OR
ALERTS (TXXX) DISPLAYED.

NO

Use to clear active alarms/alerts

NO

NO Flashes

YES

Select YES

NO

Alarms/alerts clear, YES changes to NO

Return temperature reset allows for the leaving temperature
set point to be reset upward as a function of the return fluid
temperature or, in effect, the building load.

Temperature Reset — The control system is capable of
handling leaving-fluid temperature reset based on return cooler
fluid temperature. Because the change in temperature through
the cooler is a measure of the building load, the return temperature reset is in effect an average building load reset method.
The control system is also capable of temperature reset based
on outdoor-air temperature (OAT), space temperature (SPT), or
from an externally powered 4 to 20 mA signal. Accessory sensors must be used for OAT and SPT reset (HH79NZ073 for
OAT and HH51BX006 for SPT). The Energy Management
Module (EMM) must be used for temperature reset using a 4 to
20 mA signal.
To use the return reset, four variables must be configured. In
the Configuration mode under the sub-mode RSET, items
CRST, CRT1, CRT2, and DGRC must be set properly. See Table 26 on page 44 for correct configuration. See Fig. 2-4 for
wiring details.
Under normal operation, the chiller will maintain a constant
leaving fluid temperature approximately equal to the chilled
fluid set point. As the cooler load varies, the entering cooler
fluid will change in proportion to the load as shown in Fig. 21.
Usually the chiller size and leaving-fluid temperature set point
are selected based on a full-load condition. At part load, the fluid temperature set point may be colder than required. If the
leaving fluid temperature was allowed to increase at part load,
the efficiency of the machine would increase.

LEGEND
EWT — Entering Water (Fluid) Temperature
LWT — Leaving Water (Fluid) Temperature

Fig. 21 — Standard Chilled Fluid
Temperature Control — No Reset

43

Table 26 — Configuring Temperature Reset
MODE

KEYPAD
KEYPAD
SUB-MODE
ITEM DISPLAY
ENTRY
ENTRY
ENTER

DISP

ENTER

TEST

UNIT

ENTER

TYPE

UNIT TYPE

OPT1

ENTER

FLUD

COOLER FLUID

OPT2

ENTER

RSET

CONFIGURATION

ENTER

ON/OFF

ITEM
EXPANSION

COMMENT

TEST DISPLAY LEDS

CTRL

CONTROL METHOD

CRST

COOLING RESET TYPE

0 = No Reset
1 = 4 to 20 mA Input (EMM required)
(Connect to EMM J6-2,5)
2 = Outdoor-Air Temperature
(Connect to TB5-7,8)
3 = Return Fluid
4 = Space Temperature (Connect to
TB5-5,6)
Default: 125 F (51.7 C)
CRT1 XXX.X F NO COOL RESET TEMP Range: 0° to125 F
Set to 4.0 for CRST= 1
Default: 0° F (–17.8 C)
CRT2 XXX.X F FULL COOL RESET TEMP Range: 0° to 125 F
Set to 20.0 for CRST=1
Default: 0° F (0° C)
DGRC XX.X °F DEGREES COOL RESET
Range: –30 to 30° F (–16.7 to 16.7° C)

The following are examples of outdoor air and space temperature resets:

LEGEND
LWT — Leaving Water (Fluid) Temperature

LEGEND
LWT — Leaving Water (Fluid) Temperature

44

Cooling Set Point (4 to 20 mA) — A field supplied

enable the function. Figure 22 shows how the 4 to 20 mA signal is linearly calculated on an overall 10 F to 80 F range for
fluid types (Configuration mode, sub-mode OPT1, item
FLUD) 1 or 2.

and generated, externally powered 4 to 20 mA signal can be
used to provide the leaving fluid temperature set point. Connect
the signal to TB6-3,5 (+,–). See Table 27 for instructions to
100
(38)

SET POINT, F (C)

80
(27)

60
(15)

40
(4.4)

20
(-7)

0
(-17)

4

6.3

8.6

10.9

13.1

15.4

17.7

20

4 TO 20 mA SIGNAL TO EMM

EMM — Energy Management Module

Fig. 22 — Cooling Set Point (4 to 20 mA)

Table 27 — Menu Configuration of 4 to 20 mA Cooling Set Point Control
MODE
(RED LED)

KEYPAD
ENTRY

SUB-MODE

CONFIGURATION

ENTER

DISP

KEYPAD
ENTRY

ITEM

DISPLAY

ITEM
EXPANSION

ENTER

CLSP

0

COOLING SETPOINT SELECT

COMMENT

UNIT
OPT1
OPT2
RSET
SLCT

ENTER

0

Scrolling Stops

ENTER

0

Flashing ‘0’

4

Select ‘4’

4

Change Accepted

ENTER

45

Demand Limit — Demand Limit is a feature that allows

2 set point. The demand limit stage that is set to the lowest demand takes priority if both demand limit inputs are closed. If
the demand limit percentage does not match unit staging, the
unit will limit capacity to the closest capacity stage.
To disable demand limit configure the DMDC to 0. See
Table 28.
EXTERNALLY POWERED DEMAND LIMIT (4 to
20 mA Controlled) — To configure Demand Limit for 4 to
20 mA control set the Demand Limit Select (DMDC) to 2.
Then configure the Demand Limit at 20 mA (DM20) to the
maximum loadshed value desired. The control will reduce allowable capacity to this level for the 20 mA signal. See
Table 28 and Fig. 23.
DEMAND LIMIT (CCN Loadshed Controlled) — To configure Demand Limit for CCN Loadshed control set the Demand Limit Select (DMDC) to 3. Then configure the Loadshed
Group Number (SHNM), Loadshed Demand Delta (SHDL),
and Maximum Loadshed Time (SHTM). See Table 28.
The Loadshed Group number is established by the CCN
system designer. The MBB will respond to a Redline command from the Loadshed control. When the Redline command
is received, the current stage of capacity is set to the maximum
stages available. Should the loadshed control send a Loadshed
command, the MBB will reduce the current stages by the value
entered for Loadshed Demand delta. The Maximum Loadshed
Time defines the maximum length of time that a loadshed condition is allowed to exist. The control will disable the Redline/
Loadshed command if no Cancel command has been received
within the configured maximum loadshed time limit.

the unit capacity to be limited during periods of peak energy
usage. There are 3 types of demand limiting that can be configured. The first type is through 2-stage switch control, which
will reduce the maximum capacity to 2 user-configurable percentages. The second type is by 4 to 20 mA signal input which
will reduce the maximum capacity linearly between 100% at a
4 mA input signal (no reduction) down to the user-configurable
level at a 20 mA input signal. The third type uses the CNN
Loadshed module and has the ability to limit the current operating capacity to maximum and further reduce the capacity if
required.
NOTE: The 2-stage switch control and 4 to 20 mA input signal
types of demand limiting require the Energy Management
Module (EMM).
To use Demand Limit, select the type of demand limiting to
use. Then configure the Demand Limit set points based on the
type selected.
DEMAND LIMIT (2-Stage Switch Controlled) — To configure Demand Limit for 2-stage switch control set the
Demand Limit Select (DMDC) to 1. Then configure the 2 Demand Limit Switch points (DLS1 and DLS2) to the desired capacity limit. See Table 28. Capacity steps are controlled by
2 relay switch inputs field wired to TB6 as shown in Fig. 2-4.
For Demand Limit by 2-stage switch control, closing the
first stage demand limit contact will put the unit on the first demand limit level. The unit will not exceed the percentage of capacity entered as Demand Limit Switch 1 set point. Closing
contacts on the second demand limit switch prevents the unit
from exceeding the capacity entered as Demand Limit Switch

Table 28 — Configuring Demand Limit
MODE
CONFIGURATION

KEYPAD
ENTRY

SUB-MODE

KEYPAD
ENTRY

ITEM

DISPLAY

ITEM EXPANSION

ENTER

DISP

ENTER

TEST

ON/OFF

Test Display LEDs

UNIT

ENTER

TYPE

X

Unit Type

OPT1

ENTER

FLUD

X

Cooler Fluid

OPT2

ENTER

CTRL

X

Control Method

RSET

ENTER

CRST

X

Cooling Reset Type

CRT1

XXX.X °F

No Cool Reset Temperature

CRT2

XXX.X °F

Full Cool Reset Temperature

DGRC

XX.X ∆F

Degrees Cool Reset

DMDC

X

Demand Limit Select

DM20

XXX %

Demand Limit at 20 mA

SHNM

XXX

Loadshed Group
Number

SHDL

XXX%

Loadshed Demand
Delta

SHTM

XXX MIN

Maximum Loadshed
Time

DLS1

XXX %

Demand Limit
Switch 1

DLS2

XXX%

Demand Limit
Switch 2

NOTE: Heating reset values skipped in this example.

46

COMMENT

Default: 0
0 = None
1 = Switch
2 = 4 to 20 mA Input
3 = CCN Loadshed
Default: 100%
Range: 0 to 100
Default: 0
Range: 0 to 99
Default: 0%
Range: 0 to 60%
Default: 60 min.
Range: 0 to 120 min.
Default: 80%
Range: 0 to 100%
Default: 50%
Range: 0 to 100%

MAX. ALLOWABLE LOAD (%)

100

50% CAPACITY AT 20 mA

80
60
40 100% CAPACITY AT 4 mA
75% CAPACITY AT 12 mA
20

0

0

2

6
12
8
10
14
DEMAND LIMIT SIGNAL – 4 - 20 mA INPUT (VOLTS DC)

4

16

18

20

Fig. 23 — 4 to 20 mA Demand Limiting

TROUBLESHOOTING

the quick test and initialization features built into the
ComfortLink™ control.
Follow the procedure below to diagnose and correct EXV
problems.
STEP 1 — CHECK PROCESSOR EXV OUTPUTS —
Check EXV output signals at the J6 and J7 terminals of the
EXV board.
Turn unit power off. Connect the positive lead of the meter
to terminal 3 on connector J6 on the EXV board. Set meter for
approximately 20 vdc. Turn unit power on. Enter and enable
the Service Test mode. Locate the appropriate EXV under
‘OUTS.’ Select the desired percentage and press Enter to move
the valve. The valve will overdrive in both directions when
either 0% or 100% are entered. During this time, connect the
negative test lead to terminals 1, 2, 4, and 5 in succession. The
voltage should fluctuate at each pin. If it remains constant at a
voltage or at 0 v, replace the EXV board. If the outputs are correct, then check the EXV.
To test Circuit B outputs, follow the same procedure above,
except connect the positive lead of the meter to terminal 3 on
connector J7 on the EXV board and the negative lead to terminals 1, 2, 4, and 5 in succession.
STEP 2 — CHECK EXV WIRING — Check wiring to
EXVs from J6 and J7 connectors on EXV board.
1. Check color coding and wire connections. Make sure
that wires are connected to correct terminals at J6 and
J7 connectors and EXV plug connections. Check for
correct wiring at driver board input and output terminals. See Fig. 2-4.
2. Check for continuity and tight connection at all pin
terminals.
3. Check plug connections at J6 and J7 connectors and at
EXVs. Be sure EXV connections are not crossed.
STEP 3 — CHECK RESISTANCE OF EXV MOTOR
WINDINGS — Remove connector at J6 and/or J7 of EXV
board and check resistance between common lead (red wire,
terminal D) and remaining leads A, B, C, and E. Resistance
should be 25 ohms ± 2 ohms. Check all leads to ground for
shorts.
STEP 4 — CHECK THERMISTORS THAT CONTROL
EXV — Check thermistors that control processor output voltage pulses to the EXVs. Circuit A thermistor is T7, and circuit
B thermistor is T8. Refer to Fig. 9 and 10 for location.
1. Refer to Thermistors section on page 59 for details on
checking thermistor calibration.

Compressor Protection Control System
(CPCS) Board — The compressor protection board controls the compressor and compressor crankcase heater.
The ground current protection is provided by the compressor board.
The large relay located on the board is used to provide a
feedback signal to the Main Base Board.
The operation of the compressor board can be checked using the Service Test procedure. When the Service Test step is
turned on, the compressor board is energized. All safeties are
continuously monitored. The crankcase heater will be turned
off and the compressor contactor will be turned on. The feedback contacts will close and the Main Base Board (MBB) will
read the feedback status.
If the board does not perform properly, use standard wiring
troubleshooting procedures to check the wiring for open circuits. Refer to Alarms and Alerts section on page 48 for alarm
or alert codes for possible causes for failure.
If a compressor short-to-ground exists, the compressor
board may detect the short before the circuit breaker trips. If
this is suspected, check the compressor for short-to-ground
failures with an ohmmeter. The ground current is sensed with a
current toroid (coil) around all 3 or 6 wires between the main
terminal block and the compressor circuit breaker(s).

Compressor Ground Current (CGF) Board
(30GTN,R and 30GUN,R 130-210, 230A-315A,
and 330A/B-420A/B) — One board is used for each circuit of these units. Each board receives input from up to 4 toroids wired in series, one toroid per compressor. With 24 v supplied at terminals A and B, a current imbalance (compressor
ground current) sensed by any toroid causes the NC (normally
closed) contacts to open, shutting down the lead compressor in
the affected circuit. All other compressors in that circuit shut
down as a result. The NC contacts remain open until the circuit
is reset by momentarily deenergizing the board using the pushbutton switch.
If the NC contacts open, it is necessary to remove toroids
from the T1-T2 circuit to determine which toroid is causing the
trip. The chiller circuit can then be put back on line after the
circuit breaker of the faulty compressor is opened. The compressor problem can then be diagnosed by normal troubleshooting procedures.

EXV Troubleshooting — If it appears that the EXV is
not properly controlling operating suction pressure or superheat, there are a number of checks that can be made using
47

Open liquid line service valve. Check for any refrigerant
leaks. Turn the ENABLE/OFF/REMOTE switch back to
ENABLE or REMOTE and allow the unit to operate.
Verify proper unit operation.
NOTE: The EXV orifice is a screw-in type and may be
removed for inspection and cleaning. Once the motor canister
is removed the orifice can be removed by using the orifice
removal tool (part no. TS429). A slot has been cut in the top of
the orifice to facilitate removal. Turn orifice counterclockwise
to remove. A large screwdriver may also be used.
When cleaning or reinstalling orifice assembly be careful
not to damage orifice assembly seals. The bottom seal acts as a
liquid shut-off, replacing a liquid line solenoid valve. If the bottom seal should become damaged it can be replaced. Remove
the orifice. Remove the old seal. Using the orifice as a guide,
add a small amount of O-ring grease, to the underside of the orifice. Be careful not to plug the vent holes. Carefully set the
seal with the O-ring into the orifice. The O-ring grease will
hold the seal in place. If the O-ring grease is not used, the seal
O-ring will twist and bind when the orifice is screwed into the
EXV base. Install the orifice and seal assembly. Remove the
orifice to verify that the seal is properly positioned. Clean any
O-ring grease from the bottom of the orifice. Reinstall the orifice and tighten to 100 in.-lb (11 N-m). Apply a small amount
of O-ring grease to the housing seal O-ring before installing the
motor canister. Reinstall the motor canister assembly. Tighten
the motor nut to 15 to 25 ft-lb (20 to 34 N-m).

2. Make sure that thermistor leads are connected to the
proper pin terminals at the J5 connector on EXV board
and that thermistor probes are located in proper position
in the refrigerant circuit.
When these checks have been completed, the actual operation of the EXV can be checked by using the procedures outlined in Step 5 — Check Operation of the EXV section below.
STEP 5 — CHECK OPERATION OF THE EXV — Use
the following procedure to check the actual operation of the
EXVs. The ENABLE/OFF/REMOTE contact switch must be
in the OFF position.
1. Close the liquid line service valve for the circuit to be
checked and run through the appropriate service test to
pump down the low side of the system. Run lead compressor for at least 30 seconds to ensure all refrigerant
has been pumped from the low side and that the EXV
has been driven fully open (1500 steps).
NOTE: Do not use the Emergency ON-OFF switch to
recycle the control during this step.
2. Turn off the compressor circuit breaker(s) and the control
circuit power and then turn the Emergency ON/OFF
switch to the OFF position. Close compressor service
valves and remove any remaining refrigerant from the
low side of the system.
3. Carefully loosen the 2-1/8 in. nut. Do not twist the valve.
Remove the motor canister from the valve body using
caution to avoid damage to the o-ring seal. If the EXV
plug was disconnected during this process reconnect it
after the motor canister is removed.
4. Note position of lead screw (see Fig. 15). If valve has responded properly to processor signals in Step 5.1 above,
the lead screw should be fully retracted.
5. Recycle the control by turning the Emergency ON-OFF
switch to the ON position. This puts the control in initialization mode. During the first 60 seconds of the initialization mode, each valve is driven to the fully closed position (1500 steps) by the processor. Observe the movement of the lead screw. It should be smooth and uniform
from the fully retracted (open) to the fully extended
(closed) position.
6. When the test has been completed, carefully reassemble
expansion valve. Apply a small amount of O-ring grease
to the housing seal O-ring before installing the motor canister. Be careful not to damage the O-ring. Tighten the
motor nut to 15 to 25 lb-ft (20 to 34 N-m). Evacuate the
low side of the open refrigerant circuit. Open compressor
service valves and close compressor circuit breakers.

Alarms and Alerts — These are warnings of abnormal
or fault conditions, and may cause either one circuit or the
whole unit to shut down. They are assigned code numbers as
described in Table 29.
Automatic alarms will reset without operator intervention if
the condition corrects itself. The following method must be
used to reset manual alarms:
Before resetting any alarm, first determine the cause of the
alarm and correct it. Enter the Alarms mode indicated by the
LED on the side of the Scrolling Marquee Display. Press
until the sub-menu item RCRN “RESET
ENTER and
ALL CURRENT ALARMS” is displayed. Press ENTER .
The control will prompt the user for a password, by displaying
PASS and WORD. Press ENTER to display the default password, 1111. Press ENTER for each character. If the password
has been changed, use the arrow keys to change each individual character. Toggle the display to “YES” and press ENTER .
The alarms will be reset.

48

Table 29 — Alarm and Alert Codes
ALARM/
ALERT
CODE
T051

ALARM
OR
ALERT
Alert

Circuit A, Compressor 1
Failure

WHY WAS THIS
ALARM
GENERATED?
Compressor feedback signal
does not match relay state

T052

Alert

Circuit A, Compressor 2
Failure

Compressor feedback signal
does not match relay state

Circuit A shut down. Circuit
restarted in 1 minute. Compressor A2 not used until
alarm is reset.

Manual

T053

Alert

Circuit A, Compressor 3
Failure

Compressor feedback signal
does not match relay state

Circuit A shut down. Circuit
restarted in 1 minute. Compressor A3 not used until
alarm is reset.

Manual

T054

Alert

Circuit A, Compressor 4
Failure

Compressor feedback signal
does not match relay state

Circuit A shut down. Circuit
restarted in 1 minute. Compressor A4 not used until
alarm is reset.

Manual

T055

Alert

Circuit B, Compressor 1
Failure

Compressor feedback signal
does not match relay state

Circuit B shut down.

Manual

T056

Alert

Circuit B, Compressor 2
Failure

Compressor feedback signal
does not match relay state

Circuit B shut down. Circuit
restarted in 1 minute. Compressor B2 not used until
alarm is reset.

Manual

T057

Alert

Circuit B, Compressor 3
Failure

Compressor feedback signal
does not match relay state

Circuit B shut down. Circuit
restarted in 1 minute. Compressor B3 not used until
alarm is reset.

Manual

A060

Alarm

A061

Alarm

T064

Alert

Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Thermistor outside range of
–40 to 245 F (–40 to 118 C)
Thermistor outside range of
–40 to 245 F (–40 to 118 C)

Chiller shutdown after
pumpdown complete.
Chiller shutdown after
pumpdown complete.
Circuit A shutdown after
pumpdown complete.

T065

Alert

Thermistor outside range of
–40 to 245 F (–40 to 118 C)

Circuit B shutdown after
pumpdown complete.

Automatic

Thermistor failure, damaged
cable/wire or wiring error.

T066

Alert

Cooler Leaving Fluid
Thermistor Failure (T1)
Cooler Entering Fluid
Thermistor Failure (T2)
Circuit A Saturated Condensing Thermistor Failure
(T3)
Circuit B Saturated Condensing Thermistor Failure
(T4)
Circuit A Saturated Suction
Thermistor Failure (T5)

Thermistor outside range of
–40 to 245 F (–40 to 118 C)

Automatic

Thermistor failure, damaged
cable/wire or wiring error.

T067

Alert

Circuit B Saturated Suction
Thermistor Failure (T6)

Thermistor outside range of
–40 to 245 F (–40 to 118 C)

Automatic

Thermistor failure, damaged
cable/wire or wiring error.

T068

Alert

Compressor A1 Suction
Gas Thermistor Failure (T7)

Thermistor outside range of
–40 to 245 F (–40 to 118 C)

Automatic

Thermistor failure, damaged
cable/wire or wiring error.

T069

Alert

Compressor B1 Suction
Gas Thermistor Failure (T8)

Thermistor outside range of
–40 to 245 F (–40 to 118 C)

Automatic

Thermistor failure, damaged
cable/wire or wiring error.

T073

Alert

Outside Air Thermistor
Failure (T9)

Thermistor outside range of
–40 to 245 F (–40 to 118 C)

Automatic

Thermistor failure, damaged
cable/wire or wiring error.

T074

Alert

Space Temperature
Thermistor Failure (T10)

Thermistor outside range of
–40 to 245 F (–40 to 118 C)

Automatic

Thermistor failure, damaged
cable/wire or wiring error.

T077

Alert

Alert

T079

Alert

Saturated suction is
greater than leaving fluid
temperature for more than
5 minutes
Saturated suction is
greater than leaving fluid
temperature for more than
5 minutes
Thermistor outside range of
–40 to 245 F (–40 to 118 C)

Automatic

T078

Circuit A Saturated
Suction Temperature
exceeds Cooler Leaving
Fluid Temperature
Circuit B Saturated
Suction Temperature
exceeds Cooler Leaving
Fluid Temperature
Lead/Lag Thermistor Failure

Circuit A shutdown after
pumpdown complete.
(EXV only)
Circuit B shutdown after
pumpdown complete.
(EXV only).
Circuit A shutdown after
pumpdown complete.
(EXV only).
Circuit B shutdown after
pumpdown complete.
(EXV only).
Temperature reset disabled.
Chiller runs under normal
control/set points.
Temperature reset disabled.
Chiller runs under normal
control/set points.
Circuit A shutdown after
pumpdown complete.

Faulty expansion valve or
EXV board, faulty cooler suction thermistor (T5) or leaving fluid thermistor (T1).
Faulty expansion valve or
EXV board, faulty cooler suction thermistor (T6) or leaving fluid thermistor (T1).
Dual chiller LWT thermistor
failure, damaged cable/wire
or wiring error.

DESCRIPTION

49

ACTION TAKEN
BY CONTROL

RESET
METHOD

PROBABLE
CAUSE

Circuit A shut down.

Manual

High-pressure or loss-ofcharge switch open, faulty
control relay or CPCS board,
loss of condenser air, liquid
valve closed, operation
beyond capability.
High-pressure switch open,
faulty control relay or CPCS
board, loss of condenser air,
liquid valve closed, operation beyond capability.
High-pressure switch open,
faulty control relay or CPCS
board, loss of condenser air,
liquid valve closed, operation beyond capability.
High-pressure switch open,
faulty control relay or CPCS
board, loss of condenser air,
liquid valve closed, operation beyond capability.
High-pressure or loss-ofcharge switch open, faulty
control relay or CPCS board,
loss of condenser air, liquid
valve closed, operation
beyond capability.
High-pressure switch open,
faulty control relay or CPCS
board, loss of condenser air,
liquid valve closed, operation beyond capability.
High-pressure switch open,
faulty control relay or CPCS
board, loss of condenser air,
liquid valve closed, operation beyond capability.
Thermistor failure, damaged
cable/wire or wiring error.
Thermistor failure, damaged
cable/wire or wiring error.
Thermistor failure, damaged
cable/wire or wiring error.

Automatic
Automatic
Automatic

Circuit B shutdown after
pumpdown complete

Automatic

Lead/lag algorithm runs
using Master LWT sensor
Master is lead chiller.

Automatic

Table 29 — Alarm and Alert Codes (cont)
ALARM/
ALERT
CODE
T112

ALARM
WHY WAS THIS
ACTION TAKEN
OR
DESCRIPTION
ALARM
BY CONTROL
ALERT
GENERATED?
Alert Circuit A High Suction If EXV is greater than
Circuit A shutdown after
Superheat
98%, suction superheat is pumpdown complete.
greater than 75 F (41.7 C)
and saturated suction
temperature is less than
MOP for 5 minutes

T113

Alert

Circuit B High Suction If EXV is greater than
Circuit B shutdown after
Superheat
98% suction superheat is pumpdown complete.
greater than 75 F (41.7 C)
and saturated suction
temperature is less than
MOP for 5 minutes

T114

Alert

Circuit A Low Suction
Superheat

T115

Alert

Circuit B Low Suction
Superheat

T116

Alert

Circuit A Low Cooler
Suction Temperature

T117

Alert

Circuit B Low Cooler
Suction Temperature

T118

Alert

Circuit A Low Oil
Pressure

T119

Alert

Circuit B Low Oil
Pressure

CCN
CPCS
CXB
EMM
EWT
EXV
FSM
LCW
LWT
MBB
MOP
WSM

—
—
—
—
—
—
—
—
—
—
—
—

If EXV is greater than
10%, and either suction
superheat is less than
superheat set point –10 F
(5.6 C) or saturated
suction temperature is
greater than MOP for
5 minutes
If EXV is greater than
10%, and either suction
superheat is less than
superheat set point –10 F
(5.6 C) or saturated
suction temperature is
greater than MOP for
5 minutes
1. If the saturated suction
temperature is 24 to
29° F (13.3 to 16.1° C)
below cooler LWT and
is also 2° F (1.1° C)
less than freeze*
2. If the saturated suction
temperature is 30° F
(16.7° C) below cooler
LWT and is also 2° F
(1.1° C) less than
freeze* for 10 minutes
1. If the saturated suction
temperature is 24 to
29°F (13.3 to 16.1° C)
below cooler LWT and
is also 2°F (1.1° C)
less than freeze*
2. If the saturated suction
temperature is 30° F
(16.7° C) below cooler
LWT and is also 2° F
(1.1° C) less than
freeze* for 10 minutes
Oil pressure switch open
after 1 minute of continuous operation

RESET
METHOD

PROBABLE
CAUSE

Manual

Faulty expansion
valve or EXV board,
low refrigerant
charge, plugged filter drier, faulty suction gas thermistor
(T7) or cooler thermistor (T5).
Faulty expansion
valve or EXV board,
low refrigerant
charge, plugged filter drier, faulty suction gas thermistor
(T8) or cooler thermistor (T6).
Faulty expansion
valve or EXV board,
faulty suction gas
thermistor (T7) or
cooler thermistor
(T5).

Manual

Circuit A shutdown after
pumpdown complete.

Automatic restart
after first daily
occurrence.
Manual restart
thereafter.

Circuit B shutdown after
pumpdown complete.

Automatic restart
after first daily
occurrence.
Manual restart
thereafter.

Faulty expansion
valve or EXV board,
faulty suction gas
thermistor (T8) or
cooler thermistor
(T6).

1. Mode 7 initiated. No addi- 1. Automatic reset Faulty expansion
tional capacity increases.
if corrected.
valve or EXV board,
Alert not tripped.
low refrigerant
charge, plugged filter drier, faulty suction gas thermistor
2. Circuit shutdown without 2. Manual
(T7) or cooler thermistor (T5), low
going through pumpdown.
cooler fluid flow.

1. Mode 8 initiated. No addi- 1. Automatic reset Faulty expansion
tional capacity increases.
if corrected.
valve or EXV board,
Alert not tripped.
low refrigerant
charge, plugged filter drier, faulty suction gas thermistor
(T8) or cooler ther2. Circuit shutdown without 2. Manual
mistor (T6), low
going through pumpdown.
cooler fluid flow.

Circuit shutdown without
going through pumpdown.

Manual

Oil pressure switch open Circuit shutdown without
after 1 minute of continu- going through pumpdown.
ous operation

Manual

LEGEND
Carrier Comfort Network
Compressor Protection Control System
Compressor Expansion Board
Energy Management Module
Entering Fluid Temperature
Electronic Expansion Valve
Flotronic™ System Manager
Leaving Chilled Water
Leaving Fluid Temperature
Main Base Board
Maximum Operating Pressure
Water System Manager

Oil pump failure, low
oil level, switch failure or compressor
circuit breaker
tripped.
Oil pump failure, low
oil level, switch failure or compressor
circuit breaker
tripped.

*Freeze is defined as 34° F (1.1 C) for water. For brine fluids, freeze
is CSP.1 –8° F (4.4 C) for single set point and lower of CSP.1 or
CSP.2 –8° F (4.4 C) for dual set point configuration.

50

Table 29 — Alarm and Alert Codes (cont)
ALARM/
ALERT
CODE
A150

ALARM
OR
ALERT
Alarm

A151

Alarm

Illegal Configuration

A152

Alarm

T153

DESCRIPTION
Emergency Stop

WHY WAS THIS
ALARM
GENERATED?
CCN emergency stop
command received

ACTION TAKEN
BY CONTROL

RESET
METHOD

Chiller shutdown
without going
through pumpdown.

Automatic once
CCN command for
EMSTOP returns
to normal
Manual once configuration errors
are corrected
Automatic once
alarms/alerts are
cleared that prevent the chiller
from starting.
Automatic when
correct clock control restarts.

Chiller is not
allowed to start.

Unit Down Due to
Failure

One or more of the illegal configurations
exists.
Both circuits are down
due to alarms/alerts.

Alert

Real Time Clock
Hardware Failure

Internal clock on MBB
fails

A154

Alarm

T155

Alert

Serial EEPROM
Hardware Failure
Serial EEPROM
Storage Failure

Hardware failure with
MBB
Configuration/storage
failure with MBB

Occupancy schedule will not be used.
Chiller defaults to
Local On mode.
Chiller is unable
to run.
No Action

A156

Alarm

Configuration/storage
failure with MBB

Chiller is not
allowed to run.

Manual

A157

Alarm
Alert

Hardware failure with
peripheral device
MBB loses communication with CXB

A172

Alarm

Loss of Communication with EXV

MBB loses communication with EXV

T173

Alert

Loss of Communication with EMM

MBB loses communication with EMM

T174

Alert

4 to 20 mA Cooling
Set Point Input Failure

T176

Alert

4 to 20 mA Temperature Reset Input
Failure

T177

Alert

4 to 20 mA Demand
Limit Input Failure

If configured with EMM
and input less than
2 mA or greater than
22 mA
If configured with EMM
and input less than
2 mA or greater than
22 mA
If configured with EMM
and input less than
2 mA or greater than
22 mA

Chiller is not
allowed to run.
Compressors A3,
A4 and B3 and
unloaders A2/B2
unable to operate.
Chiller shutdown
without going
through pumpdown.
4 to 20 mA temperature reset disabled.
Demand Limit set to
100%. 4 to 20 mA
set point disabled.
Set point function
disabled. Chiller
controls to CSP.1.

Manual

T170

Critical Serial
EEPROM Storage
Failure
A/D Hardware
Failure
Loss of Communication with CXB

A200

Alarm

Cooler Pump Interlock Failure to Close
at Start-Up

Interlock not closed
within 5 minutes after
unit is started

A201

Alarm

Cooler Pump Interlock Opened During
Normal Operation

Interlock opens during
operation

A202

Alarm

Cooler Pump Interlock Closed When
Pump is Off

If configured for cooler
pump control and interlock closes while cooler
pump relay is off

51

Chiller is unable
to run.

Reset function disabled. Chiller
returns to normal
set point control.
Demand limit function disabled. Chiller
returns to 100%
demand limit
control.
Cooler pump shut
off. Chiller shutdown
without going
through pumpdown.
Cooler pump shut
off. Chiller shutdown
without going
through pumpdown.
Chiller is not
allowed to start.

Manual
Manual

Automatic

Automatic
Automatic

Automatic

Automatic

Automatic

PROBABLE
CAUSE
CCN Network
command.
Configuration
error. See Note on
page 52.
Alarm notifies user
that chiller is100%
down.
Time/Date/Month/
Day/Year not properly set.
Main Base Board
failure.
Potential failure of
MBB. Download
current operating
software. Replace
MBB if error
occurs again.
Main Base Board
failure.
Main Base Board
failure.
Wiring error, faulty
wiring or failed
CXB module.
Wiring error, faulty
wiring or failed
EXV module.
Wiring error, faulty
wiring or failed
Energy Management Module
(EMM).
Faulty signal generator, wiring
error, or faulty
EMM.
Faulty signal generator, wiring
error, or faulty
EMM.
Faulty signal generator, wiring
error, or faulty
EMM.

Manual

Failure of cooler
pump, flow switch,
or interlock.

Manual

Failure of cooler
pump, flow switch,
or interlock.

Manual

Failure of cooler
pump relay or
interlock, welded
contacts.

Table 29 — Alarm and Alert Codes (cont)
ALARM/
ALERT
CODE
T203

ALARM
OR
ALERT
Alert

T204

Alert

T205

WHY WAS THIS
ALARM
GENERATED?
Master MBB loses
communication with
Slave MBB

ACTION TAKEN
BY CONTROL

RES
METHOD

PROBABLE
CAUSE

Dual chiller control disabled. Chiller runs as a
stand-alone machine.

Automatic

Loss of Communication with Master Chiller

Slave MBB loses communication with Master
MBB

Dual chiller control disabled. Chiller runs as a
stand-alone machine

Automatic

Alert

Master and Slave
Chiller with Same
Address

Master and slave chiller Dual chiller routine dishave the same CCN
abled. Master/slave run
address (CCN.A)
as stand-alone chillers.

Automatic

T206

Alert

High Leaving Chilled
Water Temperature

Automatic

A207

Alarm

Cooler Freeze
Protection

LWT read is greater
than LCW Alert Limit,
plus control point and
Total capacity is 100%
and LWT is greater
than LWT reading one
minute ago
Cooler EWT or LWT is
less than freeze*

Wiring error, faulty wiring, failed Slave MBB
module, power loss at
Slave chiller, wrong
slave address.
Wiring error, faulty wiring, failed Master MBB
module, power loss at
Master chiller.
CCN Address for bothchillers is the same.
Must be different.
Check CCN.A under
the OPT2 sub-mode in
configuration at both
chillers.
Building load greater
than unit capacity, low
water/brine flow or
compressor fault.
Check for other
alarms/alerts.

A208

Alarm

Low Cooler Fluid Flow

Cooler EWT is less
than LWT by 3° F
(1.7° C) for 1 minute
after a circuit is started

T950

Alert

Loss of Communication with WSM

No communications
have been received by
MBB within 5 minutes
of last transmission

T951

Alert

Loss of Communication with FSM

No communications
have been received by
MBB within 5 minutes
of last transmission

CCN
CPCS
CXB
EMM
EXV
FSM
LCW
LWT
MBB
MOP
WSM

—
—
—
—
—
—
—
—
—
—
—

DESCRIPTION
Loss of Communication with Slave Chiller

LEGEND
Carrier Comfort Network
Compressor Protection Control System
Compressor Expansion Board
Energy Management Module
Electronic Expansion Valve
Flotronic™ System Manager
Leaving Chilled Water
Leaving Fluid Temperature
Main Base Board
Maximum Operating Pressure
Water System Manager

Alert only. No action
taken.

Chiller shutdown without going through
pumpdown. Cooler
pump continues to run
(if control enabled).
Chiller shutdown without going through
pumpdown. Cooler
pump shut off (if control
enabled).
WSM forces removed.
Chiller runs under own
control.

Automatic for
first occurrence
of day. Manual
reset thereafter.

Faulty thermistor (T1/
T2), low water flow.

Manual

Faulty cooler pump,
low water flow, plugged
fluid strainer.

Automatic

FSM forces removed.
Chiller runs under own
control.

Automatic

Failed module, wiring
error, failed transformer, loose connection plug, wrong
address.
Failed module, wiring
error, failed transformer, loose connection plug, wrong
address.

NOTE: The following table shows illegal configurations:
1
2
3
4
5
6
7

*Freeze is defined as 34° F (1.1 C) for water. For brine fluids, freeze
is CSP.1 –8° F (4.4 C) for single set point and lower of CSP.1 or
CSP.2 –8° F (4.4 C) for dual set point configuration.

8
9
10
11
12
13
14
15
16

52

Unit type = 0.
4 Compressors in a circuit with 2 unloaders.
4 Compressors in a circuit with 1 unloader and hot gas
bypass.
2 Unloaders and hot gas bypass in a circuit.
More than one compressor difference between circuits (e.g., 4
compressors in Ckt A, 2 in Ckt B).
Water cooled units with optional thermistors and configured
for head pressure control.
Split system chillers with optional thermistors and configured
for head pressure control.
Low temperature brine selected for air cooled chillers or split
systems with air cooled head pressure control.
Water cooled unit configured for air cooled head pressure
control.
Air cooled head pressure control with common fan staging
and different head pressure control methods for each circuit
(EXV controlled vs. set point controlled).
Lead/lag enabled, Master selected and Cooling Set Point
select is LWT POT.
Water cooled or split units (units types 2, 3, 4) with more than
one compressor on a circuit.
Condenser pump interlock enabled on air cooled unit.
Unit type changed.
Low pressure set points out of range.
Cooler fluid type is water and ice mode is enabled.

SERVICE

30GUN,R approved polyolester (POE) oils are as follows:
• Mobil Artic EAL 68
• Castrol SW68
• ICI Emkarate RL68H
• Lubrizol 29168 (Texaco HFC Capella 68NA)
• CPI Solest 68

ELECTRIC SHOCK HAZARD.
Turn off all power to unit before servicing.
The ENABLE/OFF/REMOTE CONTACT
switch on control panel does not shut off control power; use field disconnect.

Table 30 — Oil Charge

Electronic Components

COMPRESSOR

CONTROL COMPONENTS — Unit uses an advanced electronic control system that normally does not require service.
For details on controls refer to Operating Data section.
30GTN,R AND 30GUN,R 040-110, AND 230B-315B
UNIT CONTROL BOX — When facing compressors, main
control box is at left end of unit. All incoming power enters
through main box. Control box contains power components
and electronic controls.
Outer panels are hinged and latched for easy opening. Remove screws to remove inner panels. Outer panels can be held
open for service and inspection by using door retainer on each
panel. To use door retainers: remove bottom pin from door retainer assembly, swing retainer out horizontally, and engage pin
in one of the retainer ears and the hinge assembly.
30GTN,R AND 30GUN,R 130-210, 230A-315A, AND
330A/B-420A/B UNIT CONTROL AND MAIN POWER
BOXES — The main power box is on the cooler side of the
unit, and the control box is on the compressor side. Outer panels are hinged and latched for easy opening. Remove screws to
remove inner panels.

06E250
06E265
06E275
06E299

L
6.6
9.0
9.0
9.0

Do not reuse drained oil or any oil that has been exposed to
atmosphere.
Cooler — The cooler is easily accessible from the cooler
side of the unit. The refrigerant feed components are accessible
from the control box end of the unit.
COOLER REMOVAL — Cooler can be removed from the
cooler side of the unit as follows:

Open and tag all electrical disconnects before any work
begins. Note that cooler is heavy and both fluid-side and
refrigerant-side may be under pressure.
1. To ensure the refrigerant is in the condenser, follow
this procedure:
a. Open the circuit breakers and close the discharge
valves for the lag compressors in both circuits.

Compressors — If lead compressor on either refrigerant
circuit becomes inoperative for any reason, circuit is locked off
and cannot be operated due to features built into the electronic
control system. Do not attempt to bypass controls to force compressors to run.
COMPRESSOR REMOVAL — Access to the oil pump end
of the compressor is from the compressor side of the unit. Access to the motor end of the compressor is from the inside of
the unit. All compressors can be removed from the compressor
side of the unit.

Do not close the discharge valve of an operating compressor. Severe damage to the compressor can result.

IMPORTANT: All compressor mounting hardware and
support brackets removed during servicing must be reinstalled prior to start-up.
Following the installation of the new compressor:
Tighten discharge valves to —
20 to 25 ft-lb (27 to 34 N-m)
80 to 90 ft-lb (109 to 122 N-m)
Tighten suction valves to —
80 to 90 ft-lb (109 to 122 N-m)
90 to 120 ft-lb (122 to 163 N-m)
Tighten the following fittings to —
120 in.-lb (13.5 N-m)

OIL REQUIRED
Pts
14
19
19
19

Compressor(s)
06E250
06E265,275,299

2.
3.

06E250
06E265,275,299
High-Pressure Switch
4.

OIL CHARGE (Refer to Table 30) — All units are factory
charged with oil. Acceptable oil level for each compressor is
from 1/8 to 3/8-in. of sight glass (see Fig. 35).
When additional oil or a complete charge is required, use
only Carrier-approved compressor oil.
30GTN,R approved oils are as follows:
Petroleum Specialties, Inc. — Cryol 150 (factory oil charge)
Texaco, Inc.
— Capella WF-32
Witco Chemical Co.
— Suniso 3GS

5.
6.

53

b. After the lag compressor discharge service valves
have been closed, close the liquid line service
valve for one circuit. Allow the lead compressor to
pump down that circuit until it reaches approximately 10 to 15 psig (68.8 to 103.2 kPa).
c. As soon as the system reaches that pressure, shut
down the lead compressor by opening the compressor circuit breaker, then quickly close the discharge service valve for that compressor.
d. Repeat the procedure for the other circuit.
Close the shutoff valves, if installed, in the cooler fluid
lines. Remove the cooler fluid piping.
Cooler may be under pressure. Open the air vent at the
top of the cooler, and open the drain on the bottom of the
cooler (near the leaving fluid outlet) to drain the cooler.
Both the drain and the air vent are located on the leaving
fluid end of cooler. See Fig. 24. Remove the cooler waterside strainer.
Disconnect the conduit and cooler heater wires, if
equipped. Remove all thermistors from the cooler, being
sure to label all thermistors as they are removed. Thermistor T1 is a well-type thermistor, and thermistor T2 is
immersed directly in the fluid. See Fig. 24.
Remove the insulation on the refrigerant connection end
of the cooler.
Unbolt the suction flanges from the cooler head. Save the
bolts.

7. Remove the liquid lines by breaking the silver-soldered
joints at the cooler liquid line nozzles.
8. On 30GTN,GTR and 30GUN,R 080-110 and 230B-315B
units, remove the vertical support(s) under the condenser
coil in front of the cooler. Provide temporary support as
needed. Save all screws for reinstallation later.
9. Remove the screws in the cooler feet. Slide the cooler
slightly to the left to clear the refrigerant tubing. Save all
screws.
Removing the cooler can be accomplished in one of 2 ways,
depending on the jobsite. Either continue sliding the cooler toward the end of the unit opposite the tubing and carefully remove, or pivot the cooler and remove it from the cooler side of
the unit.
REPLACING COOLER — To replace the cooler:
1. Insert new cooler carefully into place. Reattach the
screws into the cooler feet (using saved screws).
On 30GTN,GTR and 30GUN,GUR080-110 and 230B315B units, reattach the 2 vertical supports under the
condenser coil in front of the cooler using screws
saved.
2. Replace the liquid lines and solder at the cooler liquid line
nozzles.
3. Rebolt the suction flanges onto the cooler head using
bolts saved during removal. Use new gaskets for the suction line flanges. Use compressor oil to aid in gasket sealing and tighten the suction flange bolts to 70 to 90 ft-lb
(94 to 122 N-m).
NOTE: The suction flange has a 4-bolt pattern. See
Carrier specified parts for replacement part number, if
necessary.
4. Using adhesive, reinstall the cooler insulation on the refrigerant connection end of the cooler.
5. Reinstall the thermistors. Refer to Thermistors section on
page 59, and install as follows:
a. Apply pipe sealant to the 1/4-in. NPT threads on
the replacement coupling for the fluid side, and
install it in place of the original.

Do not use the packing nut to tighten the coupling. Damage
to the ferrules will result.
b. Reinstall thermistor T1 well, and insert thermistor
T1 into well.
c. Install thermistor T2 (entering fluid temperature)
so that it is not touching an internal refrigerant
tube, but so that it is close enough to sense a freeze
condition. The recommended distance is 1/8 in.
(3.2 mm) from the cooler tube. Tighten the packing nut finger tight, and then tighten 11/4 turns
more using a back-up wrench.
6. Install the cooler heater and conduit (if equipped), connecting the wires as shown in the unit wiring schematic
located on the unit.
7. Close the air vent at the top of the cooler, and close the
drain on the bottom of the cooler near the leaving fluid
outlet. Both the drain and the air vent are located on the
leaving fluid end of the cooler. See Fig. 24.
8. Reconnect the cooler fluid piping and strainer, and open
the shutoff valves (if installed). Purge the fluid of all air
before starting unit.
9. Open the discharge service valves, close the circuit breakers, and open the liquid line service valves for the
compressors.
SERVICING THE COOLER — When cooler heads and partition plates are removed, tube sheets are exposed showing
ends of tubes.

Certain tubes in the 10HB coolers cannot be removed.
Eight tubes in the bundle are secured inside the cooler to
the baffles and cannot be removed. These tubes are marked
by a dimple on the tube sheet. See Fig. 25. If any of these
tubes have developed a leak, plug the tube(s) as described
under Tube Plugging section on page 55.

LIQUID
CONNECTION

Fig. 24 — Cooler Thermistor Locations
54

SIZES 040-050

SIZES 080,090*

SIZES 170,190*

SIZES 130,150*

SIZES 060,070

SIZES 100,110*
SIZE 210*

*And associated modular units (see Tables 1A and 1B).

Fig. 25 — Typical Tube Sheets, Cover Off (Non-Removable Tubes)
Table 31 — Plugs

Tube Plugging — A leaky tube can be plugged until retubing
can be done. The number of tubes plugged determines how
soon cooler must be retubed. Tubes plugged in the following
locations will affect the performance of the unit: Any tube in
the area, particularly the tube that thermistor T2 is adjacent to,
will affect unit reliability and performance. Thermistor T2 is
used in the freeze protection algorithm for the controller. If several tubes require plugging, check with your local Carrier representative to find out how number and location can affect unit
capacity.
Figure 26 shows an Elliott tube plug and a cross-sectional
view of a plug in place.

COMPONENTS FOR
PLUGGING
For Tubes
Brass Pin
Brass Ring
For Holes without Tubes
Brass Pin
Brass Ring
Loctite
Locquic

PART NUMBER
853103-500*
853002-570*
853103-1*
853002-631*
No. 675†
“N”†

*Order directly from: Elliott Tube Company, Dayton, Ohio.
†Can be obtained locally.

Tube information follows:
Use extreme care when installing plugs to prevent damage
to the tube sheet section between the holes.

• Tube sheet hole diameter . . . . . . . . . .
• Tube OD . . . . . . . . . . . . . . . . . . . . . .
• Tube ID after rolling. . . . . . . . . . . . . . .
(includes expansion due
to clearance)

Retubing (See Table 31) — When retubing is to be done, obtain service of qualified personnel experienced in boiler maintenance and repair. Most standard procedures can be followed
when retubing the 10HB coolers. An 8% crush is recommended when rolling replacement tubes into the tubesheet. An 8%
crush can be achieved by setting the torque on the gun at 48 to
50 in.-lb (5.4 to 5.6 N-m).
The following Elliott Co. tube rolling tools are required:
B3400 Expander Assembly
B3401 Cage
B3405 Mandrel
B3408 Rolls
Place one drop of Loctite No. 675 or equivalent on top of
tube prior to rolling. This material is intended to “wick” into
the area of the tube that is not rolled into the tube sheet, and
prevent fluid from accumulating between the tube and the tube
sheet.

in.
0.631
0.625
0.581
to
0.588

mm
16.03
15.87
14.76
to
14.94

NOTE: Tubes next to gasket webs must be flush with tube
sheet (both ends).
Tightening Cooler Head Bolts
Gasket Preparation — When reassembling cooler heads,
always use new gaskets. Gaskets are neoprene-based and are
brushed with a light film of compressor oil. Do not soak gasket
or gasket deterioration will result. Use new gaskets within
30 minutes to prevent deterioration. Reassemble cooler nozzle
end or plain end cover of the cooler with the gaskets. Torque
all cooler bolts to the following specification and sequence:
5/8-in. Diameter Perimeter Bolts . . . . . . . . . . . . 150 to 170 ft-lb
(201 to 228 N-m)
1/2-in. Diameter Flange Bolts . . . . . . . . . . . . . . . . 70 to 90 ft-lb
(94 to 121 N-m)
1. Install all bolts finger tight.
2. Bolt tightening sequence is outlined in Fig. 27. Follow
the numbering or lettering sequence so that pressure is
evenly applied to gasket.

Fig. 26 — Elliott Tube Plug
55

cleaner is not available, a soft brush may be used. In either
case, the tool should be applied in the direction of the fins. Coil
surfaces can be easily damaged (fin edges bent over) if the tool
is applied across the fins.
NOTE: Use of a water stream, such as a garden hose, against a
surface loaded coil will drive the fibers and dirt into the coil.
This will make cleaning efforts more difficult. Surface loaded
fibers must be completely removed prior to using low velocity
clean water rinse.
Periodic Clean Water Rinse — A periodic clean water rinse is
very beneficial for coils that are applied in coastal or industrial
environments. However, it is very important that the water
rinse is made with very low velocity water stream to avoid
damaging the fin edges. Monthly cleaning as described below
is recommended.
Routine Cleaning of Coil Surfaces — Monthly cleaning
with Enviro-Shield™ Coil cleaner is essential to extend the life
of coils. It is recommended that all coils, including standard
aluminum, pre-coated, copper/copper or E-coated coils are
cleaned with the Enviro-Shield Coil Cleaner as described
below. Coil cleaning should be part of the units regularly
scheduled maintenance procedures to ensure long life of the
coil. Failure to clean the coils may result in reduced durability
in the environment.
Enviro-Shield Coil Cleaner is non-flammable, hypoallergenic, non-bacterial, USDA accepted biodegradable and 100%
ecologically safe agent that will not harm the coil or surrounding components such as electrical wiring, painted metal surfaces or insulation. Use of non-recommended coil cleaners is
strongly discouraged since coil and unit durability could be
affected.

3. Apply torque in one-third steps until required torque is
reached. Load all bolts to each one-third step before proceeding to next one-third step.
4. No less than one hour later, retighten all bolts to required
torque values.
5. After refrigerant is restored to system, check for refrigerant leaks with soap solution or Halide device.
6. Replace cooler insulation.

Condenser Coils
COIL CLEANING — For standard aluminum, copper and
pre-coated aluminum fin coils, clean the coils with a vacuum
cleaner, fresh water, compressed air, or a bristle brush (not
wire). Units installed in corrosive environments should have
coil cleaning as part of a planned maintenance schedule. In this
type of application, all accumulations of dirt should be cleaned
off the coil.

Do not use high-pressure water or air to clean coils — fin
damage may result.
CLEANING E-COATED COILS — Follow the outlined procedure below for proper care, cleaning and maintenance of
E-coated aluminum or copper fin coils:
Coil Maintenance and Cleaning Recommendations — Routine cleaning of coil surfaces is essential to maintain proper
operation of the unit. Elimination of contamination and
removal of harmful residues will greatly increase the life of the
coil and extend the life of the unit.
Remove Surface Loaded Fibers — Surface loaded fibers or
dirt should be removed with a vacuum cleaner. If a vacuum

SIZES 080,090* WITH 18-BOLT HEADS

SIZES 080,090* WITH 14-BOLT HEADS

SIZES 100,110* WITH 22-BOLT HEADS

SIZES 100,110* WITH 16-BOLT HEADS

SIZES 170,190*
SIZES 130,150*

SIZE 210*

*And associated modular units.

Fig. 27 — Cooler Head Bolt Tightening Sequence (Typical Tube Sheet)
56

Enviro-Shield™ Coil Cleaner Application Equipment
• 21/2 Gallon Garden Sprayer
• Water Rinse with Low Velocity Spray Nozzle
Enviro-Shield Coil Cleaner Application Instructions
• Although Enviro-Shield Coil cleaner is harmless to
humans, animals, and marine life, proper eye protection
such as safety glasses is recommended during mixing
and application.
• Remove all surface loaded fibers and dirt with a vacuum
cleaner as described above.
• Thoroughly wet finned surfaces with clean water and a
low velocity garden hose being careful not to bend fins.
• Mix Enviro-Shield Coil Cleaner in a 21/2 gallon garden
sprayer according to the instructions included with the
Enzyme Cleaner. The optimum solution temperature is
100 F.
NOTE: DO NOT USE water in excess of 130 F as the enzymatic activity will be destroyed.
• Thoroughly apply Enviro-Shield Coil cleaner solution to
all coil surfaces including finned area, tube sheets and
coil headers.
• Hold garden sprayer nozzle close to finned areas and
apply cleaner with a vertical, up-and-down motion.
Avoid spraying in horizontal pattern to minimize potential for fin damage.
• Ensure cleaner thoroughly penetrates deep into finned
areas.
• Interior and exterior finned areas must be thoroughly
cleaned.
• Finned surfaces should remain wet with cleaning solution for 10 minutes.
• Ensure surfaces are not allowed to dry before rinsing.
Reapply cleaner as needed to ensure 10-minute saturation is achieved.
• Thoroughly rinse all surfaces with low velocity clean
water using downward rinsing motion of water spray
nozzle. Protect fins from damage from the spray nozzle.

IMPORTANT: Check for proper fan rotation (clockwise
viewed from above). If necessary, switch any 2 power
leads to reverse fan rotation.

DIMENSION
A
B

Standard
0.50” (13 mm)
0.88” (22 mm)

FAN TYPE
Low Noise 60 Hz Only
(Optional)
1.50” (38 mm)
1.13” (29 mm)

NOTE: Fan rotation is clockwise as viewed from top of unit.

Fig. 28A — Condenser Fan Adjustment —
Standard 50 and 60 Hz Units and
60 Hz Low Noise Fan Option Units

PLASTIC FAN
PROPELLER

Harsh Chemical and Acid Cleaners — Harsh chemical,
household bleach or acid cleaners should not be used to
clean outdoor or indoors coils of any kind. These cleaners
can be very difficult to rinse out of the coil and can accelerate corrosion at the fin/tube interface where dissimilar
materials are in contact. If there is dirt below the surface of
the coil, use the Enviro-Shield Coil Cleaner as described
above.
High Velocity Water or Compressed Air — High velocity water from a pressure washer, garden hose or compressed air should never be used to clean a coil. The force
of the water or air jet will bend the fin edges and increase
airside pressure drop. Reduced unit performance or nuisance unit shutdown may occur.

CLEARANCE
OF 0.25 INCHES
(6.4 MM)
FAN DECK
SURFACE

FAN ORIFICE

Fig. 28B — Condenser Fan Adjustment —
50 Hz Low Noise Fan Option Units

Condenser Fans — Each fan is supported by a formed
wire mount bolted to fan deck and covered with a wire guard.
The exposed end of fan motor shaft is protected from weather
by grease. If fan motor must be removed for service or replacement, be sure to regrease fan shaft and reinstall fan guard. For
proper performance, fan should be positioned as in Fig. 28A
and 28B (standard and low-noise applications). Tighten setscrews to 15 ± 1 ft-lb (20 ± 1.3 N-m).
If the unit is equipped with the high-static fan option, the fan
must be set from the top of the fan deck to the plastic ring or
center of the fan to a distance of 2.13 in. ± 0.12 in.
(54 ± 3 mm). This is different from standard fans, since there is
no area available to measure from the top of the orifice ring to
the fan hub itself. See Fig. 29.

NOTE: Dimensions are in millimeters. Dimensions in [ ] are in
inches.

Fig. 29 — Condenser Fan Adjustment,
Units with High-Static Fan Operation

57

Refrigerant Feed Components — Each circuit has
all necessary refrigerant controls.
ELECTRONIC EXPANSION VALVE (EXV) — A cutaway view of valve is shown in Fig. 30.
High-pressure liquid refrigerant enters valve through bottom. A series of calibrated slots have been machined in side of
orifice assembly. As refrigerant passes through orifice, pressure
drops and refrigerant changes to a 2-phase condition (liquid
and vapor). To control refrigerant flow for different operating
conditions, a sleeve moves up and down over orifice and modulates orifice size. A sleeve is moved by a linear stepper motor.
Stepper motor moves in increments and is controlled directly
by EXV module. As stepper motor rotates, motion is transferred into linear movement by lead screw. Through stepper
motor and lead screw, 1500 discrete steps of motion are obtained. The large number of steps and long stroke results in
very accurate control of refrigerant flow. The minimum position for operation is 120 steps.
The EXV module controls the valve. The lead compressor
in each circuit has a thermistor located in the suction manifold
after the compressor motor and a thermistor located in a well
where the refrigerant enters the cooler. The thermistors measure the temperature of the superheated gas entering the compressor cylinders and the temperature of the refrigerant entering the cooler. The difference between the temperature of the
superheated gas and the cooler suction temperature is the superheat. The EXV module controls the position of the electronic expansion valve stepper motor to maintain superheat set
point.
The superheat leaving cooler is approximately 3° to 5° F
(2° to 3° C), or less.
Because EXV status is communicated to the Main Base
Board (MBB) and is controlled by the EXV modules (see
Fig. 31), it is possible to track the valve position. By this
means, head pressure is controlled and unit is protected against
loss of charge and a faulty valve. During initial start-up, EXV
is fully closed. After initialization period, valve position is
tracked by the EXV module by constantly monitoring amount
of valve movement.
The EXV is also used to limit cooler saturated suction temperature to 50 F (10 C). This makes it possible for the chiller to
start at higher cooler fluid temperatures without overloading
the compressor. This is commonly referred to as MOP (maximum operating pressure).
If it appears that EXV is not properly controlling circuit operation to maintain correct superheat, there are a number of
checks that can be made using test functions and initialization
features built into the microprocessor control. See Service Test
section on page 29 to test EXVs.
NOTE: The EXV orifice is a screw-in type and may be
removed for inspection and cleaning. Once the motor canister
is removed the orifice can be removed by using the orifice
removal tool (part no. TS429). A slot has been cut in the top of
the orifice to facilitate removal. Turn orifice counterclockwise
to remove. A large screwdriver may also be used.
When cleaning or reinstalling orifice assembly be careful
not to damage orifice assembly seals. The bottom seal acts as a
liquid shut-off, replacing a liquid line solenoid valve. If the bottom seal should become damaged it can be replaced. Remove
the orifice. Remove the old seal. Using the orifice as a guide,
add a small amount of O-ring grease, to the underside of the orifice. Be careful not to plug the vent holes. Carefully set the
seal with the O-ring into the orifice. The O-ring grease will
hold the seal in place. If the O-ring grease is not used, the seal
O-ring will twist and bind when the orifice is screwed into the
EXV base. Install the orifice and seal assembly. Remove the
orifice to verify that the seal is properly positioned. Clean any
O-ring grease from the bottom of the orifice. Reinstall the orifice and tighten to 100 in.-lb (11 N-m). Apply a small amount

of O-ring grease to the housing seal O-ring before installing the
motor canister. Reinstall the motor canister assembly. Tighten
the motor nut to 15 to 25 ft-lb (20 to 34 N-m).
Check EXV operation using test functions described in the
Service Test section on page 29.
MOISTURE-LIQUID INDICATOR — Clear flow of liquid
refrigerant indicates sufficient charge in system. Bubbles in the
sight glass indicate undercharged system or presence of noncondensables. Moisture in system measured in parts per million (ppm), changes color of indicator:
Green — moisture is below 45 ppm;
Yellow-green (chartreuse) — 45 to 130 ppm (caution);
Yellow (wet) — above 130 ppm.
Change filter drier at first sign of moisture in system.
IMPORTANT: Unit must be in operation at least
12 hours before moisture indicator can give an accurate
reading. With unit running, indicating element must be
in contact with liquid refrigerant to give true reading.
FILTER DRIER — Whenever moisture-liquid indicator
shows presence of moisture, replace filter drier(s). There is one
filter drier on each circuit. Refer to Carrier Standard Service
Techniques Manual, Chapter 1, Refrigerants, for details on servicing filter driers.
LIQUID LINE SOLENOID VALVE — All TXV units have
a liquid line solenoid valve to prevent liquid refrigerant migration to low side of system during the off cycle.
LIQUID LINE SERVICE VALVE — This valve is located
immediately ahead of filter drier, and has a 1/4-in. Schrader
connection for field charging. In combination with compressor
discharge service valve, each circuit can be pumped down into
the high side for servicing.

STEPPER
MOTOR (12 VDC)
LEAD SCREW

PISTON SLEEVE

ORIFICE ASSEMBLY
(INSIDE PISTON SLEEVE)

Fig. 30 — Electronic Expansion Valve (EXV)

PL-EXVB
1
1

BRN
2

2

J7

3
4
5

3
4
5

WHT
RED
BLK
GRN

A
E
D

EXV-B

B
C

PL-EXVA
1
2

J6

3
4
5

1
2
3
4
5

A
BRN
WHT
RED
BLK
GRN

E
D

EXV-A

B
C

ELECTRONIC EXPANSION VALVES (EXVs)

Fig. 31 — Printed Circuit Board Connector
58

Thermistors — Electronic control uses 4 to 10 thermistors to sense temperatures used to control the operation of
chiller.
Thermistors T1-T9 vary in their temperature vs resistance
and voltage drop performance. Thermistor T10 is a 10 kΩ input channel and has a different set of temperature vs resistance
and voltage drop performance. Resistances at various temperatures are listed in Tables 32A-33B.
LOCATION — General locations of thermistor sensors are
shown in Fig. 7-10. See Table 2 for pin connection points.

Tables 32A-33B. To check thermistor accuracy, measure temperature at probe location with an accurate
thermocouple-type temperature measuring instrument. Insulate thermocouple to avoid ambient temperatures from influencing reading. Temperature
measured by thermocouple and temperature determined from thermistor voltage reading should be
close, ± 5° F (3° C) if care was taken in applying thermocouple and taking readings.
2. If a more accurate check is required, unit must be shut
down and thermistor removed and checked at a known
temperature (freezing point or boiling point of water) using either voltage drop measured across thermistor at the
J8 or J5 terminals, by determining the resistance with
chiller shut down and thermistor disconnected from J8 or
J5. Compare the values determined with the value read by
the control in the Temperatures mode using the Marquee
display.

Sensor T2 is installed directly in the fluid circuit. Relieve
all pressure or drain fluid before removing.
REPLACING THERMISTOR T2
1. Remove and discard original sensor and coupling. Do
not disassemble new coupling. Install assembly as
received. See Fig. 32.
2. Apply pipe sealant to 1/4-in. NPT threads on replacement
coupling, and install in place of original. Do not use the
packing nut to tighten coupling. Damage to ferrules will
result.
3. Thermistor T2 (entering fluid temperature) should not be
touching an internal refrigerant tube, but should be close
enough to sense a freeze condition. Recommended distance is 1/8 in. (3.2 mm) from cooler tube. Tighten packing nut finger tight to position ferrules, then tighten 11/4
turns more using a back-up wrench. Ferrules are now attached to the sensor, which can be withdrawn from coupling for service.
REPLACING THERMISTORS T1, T5, T6, T7, AND
T8 — Add a small amount of thermal conductive grease to
thermistor well. Thermistors are friction-fit thermistors, which
must be slipped into wells located in the cooler leaving fluid
nozzle for T1, in the cooler head for T5 and T6 (EXV units
only), and in the compressor pump end for T7 and T8 (EXV
units only).
THERMISTORS T3 AND T4 — These thermistors are
located on header end of condenser coil. They are clamped on
a return bend.
THERMISTOR/TEMPERATURE SENSOR CHECK — A
high quality digital volt-ohmmeter is required to perform this
check.
1. Connect the digital voltmeter across the appropriate
thermistor terminals at the J8 terminal strip on the
Main Base Board for thermistors T1-T6, T9, T10; or
the J5 terminal strip on the EXV Board for thermistors
T7 and T8 (see Fig. 33). Using the voltage reading
obtained, read the sensor temperature from

MAIN BASE BOARD
1

1

2

2

3

3
4

5

5

BLU

6

6

7

7

8

8

BLU
PNK
PNK

TB5
TB5
TB5
TB5

T10
5
6
T9
7
8

9

9

10

10

1

11

OUTDOOR-AIR TEMP
(ACCESSORY) OR
DUAL CHILLER LWT

2

T2

COOLER ENTERING
FLUID TEMP

1

T1

COOLER LEAVING
FLUID TEMP

4

T4

SATURATED
CONDENSING TEMPCIRCUIT B

6

T6

SATURATED
SUCTION TEMPCIRCUIT B*

3

T3

SATURATED
CONDENSING TEMPCIRCUIT A

5

T5

SATURATED
SUCTION TEMPCIRCUIT A*

2

12

J8

REMOTE SPACE TEMP
(ACCESSORY)

4

3

13

4

14

1

15

2

16

3

17

4

18

5

19

6

20

1

21

2

22

3

23

4

24

5

25

6

26

T1-T6, T9, T10 THERMISTORS

EXV BOARD

J5
X = T1,T5,T6 = 3″ (76)
T7,T8 = 4″ (102)

12 11 10

FLUID-SIDE TEMPERATURE SENSOR (T1) AND
REFRIGERANT TEMPERATURE SENSOR (T5, T6, T7, T8)

12 11
T7

7

9

7 6

5 4

3

2 1

10 9
8

CKTA*

8

T8

CKTB*

COMPRESSOR RETURN GAS TEMP
T7, T8 THERMISTORS

LEGEND
LWT — Leaving Fluid Temperature
*Not used on units with TXV (Thermostatic Expansion Valve) FIOP
(Factory-Installed Option).

FLUID-SIDE TEMPERATURE SENSOR (T2)
NOTE: Dimensions in ( ) are in millimeters.

Fig. 33 — Thermistor Connections to J5 and J8
Processor Boards

Fig. 32 — Thermistors (Temperature Sensors)
59

Table 32A — 5K Thermistor Temperature (F) vs Resistance/Voltage
VOLTAGE DROP A FOR THERMISTORS T1, T2, T7-T9
VOLTAGE DROP B FOR THERMISTORS T3-T6
TEMP
(F)
–25
–24
–23
–22
–21
–20
–19
–18
–17
–16
–15
–14
–13
–12
–11
–10
–9
–8
–7
–6
–5
–4
–3
–2
–1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58

VOLTAGE VOLTAGE
DROP A
DROP B
(V)
(V)
3.699
4.538
3.689
4.523
3.679
4.508
3.668
4.493
3.658
4.476
3.647
4.460
3.636
4.444
3.624
4.427
3.613
4.409
3.601
4.391
3.588
4.373
3.576
4.354
3.563
4.335
3.550
4.316
3.536
4.296
3.523
4.276
3.509
4.255
3.494
4.234
3.480
4.213
3.465
4.191
3.450
4.169
3.434
4.146
3.418
4.123
3.402
4.100
3.386
4.076
3.369
4.052
3.352
4.027
3.335
4.002
3.317
3.976
3.299
3.951
3.281
3.924
3.262
3.898
3.243
3.871
3.224
3.844
3.205
3.816
3.185
3.788
3.165
3.760
3.145
3.731
3.124
3.702
3.103
3.673
3.082
3.643
3.060
3.613
3.038
3.583
3.016
3.552
2.994
3.522
2.972
3.490
2.949
3.459
2.926
3.428
2.903
3.396
2.879
3.364
2.856
3.331
2.832
3.299
2.808
3.266
2.784
3.234
2.759
3.201
2.735
3.168
2.710
3.134
2.685
3.101
2.660
3.068
2.634
3.034
2.609
3.000
2.583
2.966
2.558
2.933
2.532
2.899
2.506
2.865
2.480
2.831
2.454
2.797
2.428
2.764
2.402
2.730
2.376
2.696
2.349
2.662
2.323
2.628
2.296
2.594
2.270
2.561
2.244
2.527
2.217
2.494
2.191
2.461
2.165
2.427
2.138
2.395
2.112
2.362
2.086
2.329
2.060
2.296
2.034
2.264
2.008
2.232

RESISTANCE
(Ohms)

TEMP
(F)

98,010
94,707
91,522
88,449
85,486
82,627
79,871
77,212
74,648
72,175
69,790
67,490
65,272
63,133
61,070
59,081
57,162
55,311
53,526
51,804
50,143
48,541
46,996
45,505
44,066
42,679
41,339
40,047
38,800
37,596
36,435
35,313
34,231
33,185
32,176
31,202
30,260
29,351
28,473
27,624
26,804
26,011
25,245
24,505
23,789
23,096
22,427
21,779
21,153
20,547
19,960
19,393
18,843
18,311
17,796
17,297
16,814
16,346
15,892
15,453
15,027
14,614
14,214
13,826
13,449
13,084
12,730
12,387
12,053
11,730
11,416
11,112
10,816
10,529
10,250
9,979
9,717
9,461
9,213
8,973
8,739
8,511
8,291
8,076

59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142

VOLTAGE VOLTAGE
DROP A
DROP B
(V)
(V)
1.982
2.200
1.956
2.168
1.930
2.137
1.905
2.105
1.879
2.074
1.854
2.043
1.829
2.013
1.804
1.982
1.779
1.952
1.754
1.923
1.729
1.893
1.705
1.864
1.681
1.835
1.656
1.806
1.632
1.778
1.609
1.749
1.585
1.722
1.562
1.694
1.538
1.667
1.516
1.640
1.493
1.613
1.470
1.587
1.448
1.561
1.426
1.535
1.404
1.510
1.382
1.485
1.361
1.460
1.340
1.436
1.319
1.412
1.298
1.388
1.278
1.365
1.257
1.342
1.237
1.319
1.217
1.296
1.198
1.274
1.179
1.253
1.160
1.231
1.141
1.210
1.122
1.189
1.104
1.169
1.086
1.148
1.068
1.128
1.051
1.109
1.033
1.089
1.016
1.070
0.999
1.051
0.983
1.033
0.966
1.015
0.950
0.997
0.934
0.980
0.918
0.963
0.903
0.946
0.888
0.929
0.873
0.913
0.858
0.896
0.843
0.881
0.829
0.865
0.815
0.850
0.801
0.835
0.787
0.820
0.774
0.805
0.761
0.791
0.748
0.777
0.735
0.763
0.723
0.750
0.710
0.736
0.698
0.723
0.686
0.710
0.674
0.698
0.663
0.685
0.651
0.673
0.640
0.661
0.629
0.650
0.618
0.638
0.608
0.627
0.597
0.616
0.587
0.605
0.577
0.594
0.567
0.584
0.557
0.573
0.548
0.563
0.538
0.553
0.529
0.543
0.520
0.534

60

RESISTANCE
(Ohms)

TEMP
(F)

7,686
7,665
7,468
7,277
7,091
6,911
6,735
6,564
6,399
6,238
6,081
5,929
5,781
5,637
5,497
5,361
5,229
5,101
4,976
4,855
4,737
4,622
4,511
4,403
4,298
4,196
4,096
4,000
3,906
3,814
3,726
3,640
3,556
3,474
3,395
3,318
3,243
3,170
3,099
3,031
2,964
2,898
2,835
2,773
2,713
2,655
2,597
2,542
2,488
2,436
2,385
2,335
2,286
2,239
2,192
2,147
2,103
2,060
2,018
1,977
1,937
1,898
1,860
1,822
1,786
1,750
1,715
1,680
1,647
1,614
1,582
1,550
1,519
1,489
1,459
1,430
1,401
1,373
1,345
1,318
1,291
1,265
1,240
1,214

143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225

VOLTAGE VOLTAGE
DROP A
DROP B
(V)
(V)
0.511
0.525
0.502
0.515
0.494
0.506
0.485
0.497
0.477
0.489
0.469
0.480
0.461
0.471
0.453
0.463
0.445
0.455
0.438
0.447
0.430
0.449
0.423
0.432
0.416
0.424
0.408
0.417
0.402
0.410
0.395
0.403
0.388
0.396
0.381
0.389
0.375
0.382
0.369
0.376
0.362
0.369
0.356
0.363
0.350
0.357
0.344
0.351
0.339
0.345
0.333
0.339
0.327
0.333
0.322
0.327
0.317
0.322
0.311
0.316
0.306
0.311
0.301
0.306
0.296
0.301
0.291
0.295
0.286
0.291
0.282
0.286
0.277
0.281
0.272
0.276
0.268
0.272
0.264
0.267
0.259
0.263
0.255
0.258
0.251
0.254
0.247
0.250
0.243
0.246
0.239
0.242
0.235
0.238
0.231
0.234
0.228
0.230
0.224
0.226
0.220
0.223
0.217
0.219
0.213
0.216
0.210
0.212
0.206
0.209
0.203
0.205
0.200
0.202
0.197
0.199
0.194
0.196
0.191
0.192
0.188
0.189
0.185
0.186
0.182
0.183
0.179
0.181
0.176
0.178
0.173
0.175
0.171
0.172
0.168
0.169
0.165
0.167
0.163
0.164
0.160
0.162
0.158
0.159
0.155
0.157
0.153
0.154
0.151
0.152
0.148
0.150
0.146
0.147
0.144
0.145
0.142
0.143
0.140
0.141
0.138
0.138
0.135
0.136
0.133
0.134

RESISTANCE
(Ohms)
1,190
1,165
1,141
1,118
1,095
1,072
1,050
1,029
1,007
986
965
945
925
906
887
868
850
832
815
798
782
765
750
734
719
705
690
677
663
650
638
626
614
602
591
581
570
561
551
542
533
524
516
508
501
494
487
480
473
467
461
456
450
445
439
434
429
424
419
415
410
405
401
396
391
386
382
377
372
367
361
356
350
344
338
332
325
318
311
304
297
289
282

Table 32B — 5K Thermistor Temperature (C) vs Resistance/Voltage (cont)
VOLTAGE DROP A FOR THERMISTORS T1, T2, T7-T9
VOLTAGE DROP B FOR THERMISTORS T3-T6
TEMP
(C)
–32
–31
–30
–29
–28
–27
–26
–25
–24
–23
–22
–21
–20
–19
–18
–17
–16
–15
–14
–13
–12
–11
–10
–9
–8
–7
–6
–5
–4
–3
–2
–1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14

VOLTAGE VOLTAGE
DROP A
DROP B
(V)
(V)
3.705
4.547
3.687
4.520
3.668
4.493
3.649
4.464
3.629
4.433
3.608
4.402
3.586
4.369
3.563
4.335
3.539
4.300
3.514
4.264
3.489
4.226
3.462
4.187
3.434
4.146
3.406
4.104
3.376
4.061
3.345
4.017
3.313
3.971
3.281
3.924
3.247
3.876
3.212
3.827
3.177
3.777
3.140
3.725
3.103
3.673
3.065
3.619
3.025
3.564
2.985
3.509
2.945
3.453
2.903
3.396
2.860
3.338
2.817
3.279
2.774
3.221
2.730
3.161
2.685
3.101
2.639
3.041
2.593
2.980
2.547
2.919
2.500
2.858
2.454
2.797
2.407
2.737
2.360
2.675
2.312
2.615
2.265
2.554
2.217
2.494
2.170
2.434
2.123
2.375
2.076
2.316
2.029
2.258

RESISTANCE
(Ohms)

TEMP
(C)

100,260
94,165
88,480
83,170
78,125
73,580
69,250
65,205
61,420
57,875
54,555
51,450
48,536
45,807
43,247
40,845
38,592
38,476
34,489
32,621
30,866
29,216
27,633
26,202
24,827
23,532
22,313
21,163
20,079
19,058
18,094
17,184
16,325
15,515
14,749
14,026
13,342
12,696
12,085
11,506
10,959
10,441
9,949
9,485
9,044
8,627
8,231

15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61

VOLTAGE VOLTAGE
DROP A
DROP B
(V)
(V)
1.982
2.200
1.935
2.143
1.889
2.087
1.844
2.031
1.799
1.976
1.754
1.923
1.710
1.870
1.666
1.817
1.623
1.766
1.580
1.716
1.538
1.667
1.497
1.619
1.457
1.571
1.417
1.525
1.378
1.480
1.340
1.436
1.302
1.393
1.265
1.351
1.229
1.310
1.194
1.270
1.160
1.231
1.126
1.193
1.093
1.156
1.061
1.120
1.030
1.085
0.999
1.051
0.969
1.019
0.940
0.987
0.912
0.956
0.885
0.926
0.858
0.896
0.832
0.868
0.807
0.841
0.782
0.814
0.758
0.788
0.735
0.763
0.713
0.739
0.691
0.716
0.669
0.693
0.649
0.671
0.629
0.650
0.610
0.629
0.591
0.609
0.573
0.590
0.555
0.571
0.538
0.553
0.522
0.536

61

RESISTANCE
(Ohms)

TEMP
(C)

7,855
7,499
7,161
6,840
6,536
6,246
5,971
5,710
5,461
5,225
5,000
4,786
4,583
4,389
4,204
4,028
3,861
3,701
3,549
3,404
3,266
3,134
3,008
2,888
2,773
2,663
2,559
2,459
2,363
2,272
2,184
2,101
2,021
1,944
1,871
1,801
1,734
1,670
1,609
1,550
1,493
1,439
1,387
1,337
1,290
1,244
1,200

62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107

VOLTAGE VOLTAGE
DROP A
DROP B
(V)
(V)
0.506
0.519
0.490
0.502
0.475
0.487
0.461
0.471
0.447
0.457
0.433
0.443
0.420
0.429
0.407
0.415
0.395
0.403
0.383
0.390
0.371
0.378
0.360
0.367
0.349
0.355
0.339
0.345
0.329
0.334
0.319
0.324
0.309
0.314
0.300
0.305
0.291
0.295
0.283
0.287
0.274
0.278
0.266
0.270
0.258
0.262
0.251
0.254
0.244
0.247
0.237
0.239
0.230
0.232
0.223
0.226
0.217
0.219
0.211
0.213
0.204
0.207
0.199
0.201
0.193
0.195
0.188
0.189
0.182
0.184
0.177
0.179
0.172
0.174
0.168
0.169
0.163
0.164
0.158
0.160
0.154
0.155
0.150
0.151
0.146
0.147
0.142
0.143
0.138
0.139
0.134
0.135

RESISTANCE
(Ohms)
1,158
1,118
1,079
1,041
1,006
971
938
906
876
836
805
775
747
719
693
669
645
623
602
583
564
547
531
516
502
489
477
466
456
446
436
427
419
410
402
393
385
376
367
357
346
335
324
312
299
285

Table 33A — 10K Thermistor Temperatures (°F) vs Resistance/Voltage Drop
(For Thermistor T10)
TEMP
(F)
–25
–24
–23
–22
–21
–20
–19
–18
–17
–16
–15
–14
–13
–12
–11
–10
–9
–8
–7
–6
–5
–4
–3
–2
–1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60

VOLTAGE
DROP (V)
4.758
4.750
4.741
4.733
4.724
4.715
4.705
4.696
4.686
4.676
4.665
4.655
4.644
4.633
4.621
4.609
4.597
4.585
4.572
4.560
4.546
4.533
4.519
4.505
4.490
4.476
4.461
4.445
4.429
4.413
4.397
4.380
4.363
4.346
4.328
4.310
4.292
4.273
4.254
4.235
4.215
4.195
4.174
4.153
4.132
4.111
4.089
4.067
4.044
4.021
3.998
3.975
3.951
3.927
3.903
3.878
3.853
3.828
3.802
3.776
3.750
3.723
3.697
3.670
3.654
3.615
3.587
3.559
3.531
3.503
3.474
3.445
3.416
3.387
3.357
3.328
3.298
3.268
3.238
3.208
3.178
3.147
3.117
3.086
3.056
3.025

RESISTANCE
(Ohms)
196,453
189,692
183,300
177,000
171,079
165,238
159,717
154,344
149,194
144,250
139,443
134,891
130,402
126,183
122,018
118,076
114,236
110,549
107,006
103,558
100,287
97,060
94,020
91,019
88,171
85,396
82,729
80,162
77,662
75,286
72,940
70,727
68,542
66,465
64,439
62,491
60,612
58,781
57,039
55,319
53,693
52,086
50,557
49,065
47,627
46,240
44,888
43,598
42,324
41,118
39,926
38,790
37,681
36,610
35,577
34,569
33,606
32,654
31,752
30,860
30,009
29,177
28,373
27,597
26,838
26,113
25,396
24,715
24,042
23,399
22,770
22,161
21,573
20,998
20,447
19,903
19,386
18,874
18,384
17,904
17,441
16,991
16,552
16,131
15,714
15,317

TEMP
(F)
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146

VOLTAGE
DROP (V)
2.994
2.963
2.932
2.901
2.870
2.839
2.808
2.777
2.746
2.715
2.684
2.653
2.622
2.592
2.561
2.530
2.500
2.470
2.439
2.409
2.379
2.349
2.319
2.290
2.260
2.231
2.202
2.173
2.144
2.115
2.087
2.059
2.030
2.003
1.975
1.948
1.921
1.894
1.867
1.841
1.815
1.789
1.763
1.738
1.713
1.688
1.663
1.639
1.615
1.591
1.567
1.544
1.521
1.498
1.475
1.453
1.431
1.409
1.387
1.366
1.345
1.324
1.304
1.284
1.264
1.244
1.225
1.206
1.187
1.168
1.150
1.132
1.114
1.096
1.079
1.062
1.045
1.028
1.012
0.996
0.980
0.965
0.949
0.934
0.919
0.905

62

RESISTANCE
(Ohms)
14,925
14,549
14,180
13,824
13,478
13,139
12,814
12,493
12,187
11,884
11,593
11,308
11,031
10,764
10,501
10,249
10,000
9,762
9,526
9,300
9,078
8,862
8,653
8,448
8,251
8,056
7,869
7,685
7,507
7,333
7,165
6,999
6,838
6,683
6,530
6,383
6,238
6,098
5,961
5,827
5,698
5,571
5,449
5,327
5,210
5,095
4,984
4,876
4,769
4,666
4,564
4,467
4,370
4,277
4.185
4,096
4,008
3,923
3,840
3,759
3,681
3,603
3,529
3,455
3,383
3,313
3,244
3,178
3,112
3,049
2,986
2,926
2,866
2,809
2,752
2,697
2,643
2,590
2,539
2,488
2,439
2,391
2,343
2,297
2,253
2,209

TEMP
(F)
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225

VOLTAGE
DROP (V)
0.890
0.876
0.862
0.848
0.835
0.821
0.808
0.795
0.782
0.770
0.758
0.745
0.733
0.722
0.710
0.699
0.687
0.676
0.666
0.655
0.645
0.634
0.624
0.614
0.604
0.595
0.585
0.576
0.567
0.558
0.549
0.540
0.532
0.523
0.515
0.507
0.499
0.491
0.483
0.476
0.468
0.461
0.454
0.447
0.440
0.433
0.426
0.419
0.413
0.407
0.400
0.394
0.388
0.382
0.376
0.370
0.365
0.359
0.354
0.349
0.343
0.338
0.333
0.328
0.323
0.318
0.314
0.309
0.305
0.300
0.296
0.292
0.288
0.284
0.279
0.275
0.272
0.268
0.264

RESISTANCE
(Ohms)
2,166
2,124
2,083
2,043
2,003
1,966
1,928
1,891
1,855
1,820
1,786
1,752
1,719
1,687
1,656
1,625
1,594
1,565
1,536
1,508
1,480
1,453
1,426
1,400
1,375
1,350
1,326
1,302
1,278
1,255
1,233
1,211
1,190
1,169
1,148
1,128
1,108
1,089
1,070
1,052
1,033
1,016
998
981
964
947
931
915
900
885
870
855
841
827
814
800
787
774
762
749
737
725
714
702
691
680
670
659
649
639
629
620
610
601
592
583
574
566
557

Table 33B — 10K Thermistor Temperatures (°C) vs Resistance/Voltage Drop
(For Thermistor T10)
TEMP
(C)
–32
–31
–30
–29
–28
–27
–26
–25
–24
–23
–22
–21
–20
–19
–18
–17
–16
–15
–14
–13
–12
–11
–10
–9
–8
–7
–6
–5
–4
–3
–2
–1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14

VOLTAGE
DROP (V)
4.762
4.748
4.733
4.716
4.700
4.682
4.663
4.644
4.624
4.602
4.580
4.557
4.533
4.508
4.482
4.455
4.426
4.397
4.367
4.335
4.303
4.269
4.235
4.199
4.162
4.124
4.085
4.044
4.003
3.961
3.917
3.873
3.828
3.781
3.734
3.686
3.637
3.587
3,537
3.485
3.433
3.381
3.328
3.274
3.220
3.165
3.111

RESISTANCE
(Ohms)
200,510
188,340
177,000
166,342
156,404
147,134
138,482
130,402
122,807
115,710
109,075
102,868
97,060
91,588
86,463
81,662
77,162
72,940
68,957
65,219
61,711
58,415
55,319
52,392
49,640
47,052
44,617
42,324
40,153
38,109
36,182
34,367
32,654
31,030
29,498
28,052
26,686
25,396
24,171
23,013
21,918
20,883
19,903
18,972
18,090
17,255
16,474

TEMP
(C)
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61

VOLTAGE
DROP (V)
3.056
3.000
2.944
2.889
2.833
2.777
2.721
2.666
2.610
2.555
2.500
2.445
2.391
2.337
2.284
2.231
2.178
2.127
2.075
2.025
1.975
1.926
1.878
1.830
1.784
1.738
1.692
1.648
1.605
1.562
1.521
1.480
1.439
1.400
1.362
1.324
1.288
1.252
1.217
1.183
1.150
1.117
1.086
1.055
1.025
0.996
0.968

63

RESISTANCE
(Ohms)
15,714
15,000
14,323
13,681
13,071
12,493
11,942
11,418
10,921
10,449
10,000
9,571
9,164
8,776
8,407
8,056
7,720
7,401
7,096
6,806
6,530
6,266
6,014
5,774
5,546
5,327
5,117
4,918
4,727
4,544
4,370
4,203
4,042
3,889
3,743
3,603
3,469
3,340
3,217
3,099
2,986
2,878
2,774
2,675
2,579
2,488
2,400

TEMP
(C)
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107

VOLTAGE
DROP (V)
0.940
0.913
0.887
0.862
0.837
0.813
0.790
0.767
0.745
0.724
0.703
0.683
0.663
0.645
0.626
0.608
0.591
0.574
0.558
0.542
0.527
0.512
0.497
0.483
0.470
0.457
0.444
0.431
0.419
0.408
0.396
0.386
0.375
0.365
0.355
0.345
0.336
0.327
0.318
0.310
0.302
0.294
0.287
0.279
0.272
0.265

RESISTANCE
(Ohms)
2,315
2,235
2,157
2,083
2,011
1,943
1,876
1,813
1,752
1,693
1,637
1,582
1,530
1,480
1,431
1,385
1,340
1,297
1,255
1,215
1,177
1,140
1,104
1,070
1,037
1,005
974
944
915
889
861
836
811
787
764
742
721
700
680
661
643
626
609
592
576
561

Safety Devices — Chillers contain many safety devices
and protection logic built into electronic control. Following is a
brief summary of major safeties.
COMPRESSOR PROTECTION
Circuit Breaker — One manual-reset, calibrated-trip magnetic
circuit breaker for each compressor protects against overcurrent. Do not bypass or increase size of a breaker to correct
problems. Determine cause for trouble and correct before
resetting breaker. Circuit breaker must-trip amps (MTA) are
listed on individual circuit breakers, and on unit label
diagrams.
30GTN,R and 30GUN,R070 (50 Hz), 080-110 and 230B315B Compressor Protection Board (CPCS) — The CPCS is
used to control and protect compressors and crankcase heaters.
Board provides following features:
• compressor contactor control
• crankcase heater control
• ground current protection
• status communication to processor board
• high-pressure protection
One large relay is located on CPCS that controls crankcase
heater and compressor contactor. In addition, this relay provides a set of contacts that the microprocessor monitors to determine operating status of compressor. If the MBB determines
that compressor is not operating properly through signal contacts, control locks compressor off.
The CPCS contains logic that can detect if current-toground of any winding exceeds 2.5 amps; if so, compressor
shuts down.
A high-pressure switch with a trip pressure of 426 ± 7 psig
(2936 ± 48 kPa) is mounted on each compressor; switch setting
is shown in Table 34. Switch is wired in series with the CPCS.
If switch opens, CPCS relay opens, processor detects it through
signal contacts, and compressor locks off. A loss-of-charge
switch is also wired in series with the high-pressure switch and
CPCS.
If any of these switches opens during operation, the compressor stops and the failure is detected by the MBB when signal contacts open. If lead compressor in either circuit is shut
down by high-pressure switch, ground current protector, loss of
charge switch, or oil pressure switch, all compressors in the circuit are locked off.
30GTN,R and 30GUN,R 130-210, 230A-315A and
330A/B-420A/B — A control relay in conjunction with a
ground fault module replaces the function of the CPCS
(above). To reset, press the push-button switch (near the Marquee display).

source is auxiliary control power, independent of main unit
power. This assures compressor protection even when main
unit power disconnect switch is off.
IMPORTANT: Never open any switch or disconnect
that deenergizes crankcase heaters unless unit is being
serviced or is to be shut down for a prolonged period.
After a prolonged shutdown or service, energize crankcase heaters for 24 hours before starting unit.
COOLER PROTECTION
Freeze Protection — Cooler can be wrapped with heater
cables as shown in Fig. 34, which are wired through an ambient temperature switch set at 36 F (2 C). Entire cooler is covered with closed-cell insulation applied over heater cables.
Heaters plus insulation protect cooler against low ambient temperature freeze-up to 0° F (–18 C).
IMPORTANT: If unit is installed in an area where ambient temperatures fall below 32 F (0° C), it is recommended that inhibited ethylene glycol or other suitable
corrosion-inhibitive antifreeze solution be used in
chilled-liquid circuit.
Low Fluid Temperature — Main Base Board is programmed
to shut chiller down if leaving fluid temperature drops below
34 F (1.1 C) for water or more than 8° F (4.4° C) below set
point for brine units. The unit will shut down without a
pumpout. When fluid temperature rises to 6° F (3.3° C) above
leaving fluid set point, safety resets and chiller restarts. Reset is
automatic as long as this is the first occurrence.
Loss of Fluid Flow Protection — Main Base Board contains
internal logic that protects cooler against loss of cooler flow.
Entering and leaving fluid temperature sensors in cooler detect
a no-flow condition. Leaving sensor is located in leaving fluid
nozzle and entering sensor is located in first cooler baffle space
in close proximity to cooler tubes, as shown in Fig. 34. When
there is no cooler flow and the compressors start, leaving fluid
temperature does not change. However, entering fluid temperature drops rapidly as refrigerant enters cooler through EXV.
Entering sensor detects this temperature drop and when entering temperature is 3° F (1.6° C) below leaving temperature,
unit stops and is locked off.
Loss-of-Charge — A pressure switch connected to high side
of each refrigerant circuit protects against total loss-of-charge.
Switch settings are listed in Table 34. If switch is open, unit
cannot start; if it opens during operation, unit locks out and
cannot restart until switch is closed. Low charge is also monitored by the processor when an EXV is used. The loss-ofcharge switch is wired in series with the high-pressure switch
on each circuit’s lead compressor.

Table 34 — Pressure Switch Settings,
psig (kPa)
SWITCH
High Pressure
30GTN,R Units
High Pressure
30GUN,R Units
Loss-of-Charge

CUTOUT
426 ± 7
(2936 ± 48)
280 ± 10
(1830 ± 69)
7 (48.2)

CUT-IN
320 ± 20
(2205 ± 138)
180 ± 20
(1240 ± 138)
22 (151.6)

LOW OIL PRESSURE PROTECTION — Lead compressor in each circuit is equipped with a switch to detect low oil
pressure. Switch is connected directly to processor board.
Switch is set to open at approximately 5 psig (35 kPa) and to
close at 9 psig (62 kPa) maximum. If switch opens when
compressor is running, CR or processor board stops all compressors in circuit. During start-up, switch is bypassed for
2 minutes.
CRANKCASE HEATERS — Each compressor has a 180-w
crankcase heater to prevent absorption of liquid refrigerant by
oil in crankcase when compressor is not running. Heater power

LEGEND
T — Thermistor

Fig. 34 — Cooler Heater Cables

64

Relief Devices — Fusible plugs are located in each circuit to protect against damage from excessive pressures.
HIGH-SIDE PROTECTION — One device is located
between condenser and filter drier; a second is on filter drier.
These are both designed to relieve pressure on a temperature
rise to approximately 210 F (99 C).
LOW-SIDE PROTECTION — A device is located on suction line and is designed to relieve pressure on a temperature
rise to approximately 170 F (77 C).
PRESSURE RELIEF VALVES (208/230, 460, 575 v;
60 Hz Units Only) — Valves are installed in each circuit (one
per circuit). The valves are designed to relieve at 450 psig
(3103 kPa). These valves should not be capped. If a valve
relieves, it should be replaced. If valve is not replaced, it may
relieve at a lower pressure, or leak due to trapped dirt from the
system which may prevent resealing.
The pressure relief valves are equipped with a 3/8-in. SAE
flare for field connection. Some local building codes require
that relieved gases be removed. This connection will allow
conformance to this requirement.

7.
8.
9.

10.
11.

heater has been energized for at least 24 hours. See Oil
Charge section on page 53 for Carrier-approved oils.
Electrical power source must agree with unit nameplate.
Crankcase heaters must be firmly locked into compressors, and must be on for 24 hours prior to start-up.
Fan motors are 3 phase. Check rotation of fans during the
service test. Fan rotation is clockwise as viewed from top
of unit. If fan is not turning clockwise, reverse 2 of the
power wires. For low noise fan option on 50 Hz chillers,
fans rotate counterclockwise as viewed from top of unit.
If fan is not turning counterclockwise, reverse 2 of the
power wires.
Check compressor suspension. Mounting rails must be
floating freely on the springs.
Perform service test to verify proper settings.

Other Safeties — There are several other safeties that are
provided by microprocessor control. For details refer to
Alarms and Alerts section on page 48.

PRE-START-UP
IMPORTANT: Before beginning Pre-Start-Up or StartUp, complete Start-Up Checklist for ComfortLink™
Chiller Systems at end of this publication (page CL-1).
The Checklist assures proper start-up of a unit, and
provides a record of unit condition, application requirements, system information, and operation at initial
start-up.
Do not attempt to start the chiller until following checks
have been completed.

System Check
1. Check all auxiliary components, such as the chilled
fluid circulating pump, air-handling equipment, or
other equipment to which the chiller supplies liquid.
Consult manufacturer’s instructions. If the unit
has field-installed accessories, be sure all are properly
installed and wired correctly. Refer to unit wiring
diagrams.
2. Backseat (open) compressor suction and discharge shutoff valves. Close valves one turn to allow refrigerant pressure to reach the test gages.
3. Open liquid line service valves.
4. Fill the chiller fluid circuit with clean water (with
recommended inhibitor added) or other noncorrosive fluid to be cooled. Bleed all air out of high points of system.
An air vent is included with the cooler. If outdoor temperatures are expected to be below 32 F (0° C), sufficient inhibited ethylene glycol or other suitable corrosion-inhibited antifreeze should be added to the chiller water circuit
to prevent possible freeze-up.
5. Check tightness of all electrical connections.
6. Oil should be visible in the compressor sight glass. See
Fig. 35. An acceptable oil level in the compressor is from
1/8 in. to 3/8 in. of sight glass. Adjust the oil level as required. No oil should be removed unless the crankcase

*Lead compressor only.

Fig. 35 — Compressor Connections
(Lead Compressor Shown)

65

START-UP AND OPERATION

Unbalanced 3-Phase Supply Voltage — Never operate a motor
where a phase imbalance between phases is greater than 2%.
To determine percent voltage imbalance:

NOTE: Refer to Start-Up Checklist on pages CL-1 to CL-8.

Actual Start-Up — Actual start-up should be done only
under supervision of a qualified refrigeration mechanic.
1. Be sure all service valves are open. Units are shipped
from factory with suction, discharge, and liquid line
service valves closed.
2. Using the Marquee display, set leaving-fluid set point
(CSP.1 is Set Point mode under sub-mode COOL). No
cooling range adjustment is necessary.
3. If optional control functions or accessories are being
used, the unit must be properly configured. Refer to Operating Data section for details.
4. Start chilled fluid pump.
5. Turn ENABLE/OFF/REMOTE CONTACT switch to
ENABLE position.
6. Allow unit to operate and confirm that everything is functioning properly. Check to see that leaving fluid temperature agrees with leaving set point (CSP.1 or CSP.2), or if
reset is used, with the control point (CTPT) in the Run
Status mode under the sub-mode VIEW.

% Voltage Imbalance = 100 x

The maximum voltage deviation is the largest difference
between a voltage measurement across 2 legs and the average
across all 3 legs.
Example: Supply voltage is 240-3-60.
AB = 243 v
BC = 236 v
AC = 238 v

1. Determine average voltage:
Average voltage =

Operating Limitations
TEMPERATURES (See Table 35) — If unit is to be used in
an area with high solar radiation, mounted position should be
such that control box is not exposed to direct solar radiation.
Exposure to direct solar radiation could affect the temperature
switch controlling cooler heaters.

F
125
0
95
70
38

243 + 236 + 238
3

=

717
3

=

239

2. Determine maximum deviation from average voltage:
(AB) 243 – 239 = 4 v
(BC) 239 – 236 = 3 v
(AC) 239 – 238 = 1 v
Maximum deviation is 4 v.
3. Determine percent voltage imbalance:

Table 35 — Temperature Limits for Standard Units
TEMPERATURE
Maximum Ambient Temperature
Minimum Ambient Temperature
Maximum Cooler EWT*
Maximum Cooler LWT
Minimum Cooler LWT†

max voltage deviation
from avg voltage
average voltage

C
52
–18
35
21
3.3

% Voltage Imbalance = 100 x

4
239

= 1.7%
This voltage imbalance is satisfactory as it is below the
maximum allowable of 2%.

LEGEND
EWT — Entering Fluid (Water) Temperature
LWT — Leaving Fluid (Water) Temperature

IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company immediately. Do not operate unit until imbalance
condition is corrected.

*For sustained operation, EWT should not exceed 85 F (29.4 C).
†Unit requires modification below this temperature.

Low-Ambient Operation — If operating temperatures below
0° F (–18 C) are expected, refer to separate installation instructions for low-ambient operation using accessory Motormaster® III control. Contact your Carrier representative for
details.
NOTE: Wind baffles and brackets must be field-fabricated for
all units using accessory Motormaster III controls to ensure
proper cooling cycle operation at low-ambient temperatures.
See Installation Instructions shipped with the Motormaster III
accessory for more details.

Control Circuit Power — Electronic control includes logic to
detect low control circuit voltage. Acceptable voltage ranges
are shown in the Installation Instructions.
MINIMUM FLUID LOOP VOLUME — To obtain proper
temperature control, loop fluid volume must be at least 3 gallons per ton (3.25 L per kW) of chiller nominal capacity for air
conditioning and at least 6 gallons per ton (6.5 L per kW) for
process applications or systems that must operate at low ambient temperatures (below 32 F [0° C]). Refer to application
information in Product Data literature for details.
FLOW RATE REQUIREMENTS — Standard chillers
should be applied with nominal flow rates approximating those
listed in Table 36. Higher or lower flow rates are permissible to
obtain lower or higher temperature rises. Minimum flow rates
must be exceeded to assure turbulent flow and proper heat
transfer in the cooler.

Brine duty application (below 38 F [3.3 C] LCWT) for
chiller normally requires factory modification. Contact
your Carrier representative for applicable LCWT range for
standard water-cooled chiller in a specific application.
VOLTAGE
Main Power Supply — Minimum and maximum acceptable
supply voltages are listed in the Installation Instructions.

Operation below minimum flow rate could subject tubes to
frost pinching in tube sheet, resulting in failure of cooler.

66

kept closed for 15 seconds by a time delay relay. The microprocessor stages fans to maintain the set point temperature specified by the controller. There is no pumpout sequence during
shutdown of TXV controlled chillers.
On all other units (EXV units), the head pressure is controlled by fan cycling. The desired head pressure set point is
entered, and is controlled by EXV position or saturated condensing temperature measurement (T3 and T4). For proper operation, maintain set point of 113 F (45 C) as shipped from factory. The default head pressure control method is set point control. The head pressure control can also be set to EXV control
or a combination of the 2 methods between circuits.
For all units, if temperature reset is being used, the unit controls to a higher leaving-fluid temperature as the building load
reduces. If demand limit is used, the unit may temporarily be
unable to maintain the desired leaving-fluid temperature because of imposed power limitations.
On EXV units, when the occupied period ends, or when the
building load drops low enough, the lag compressors shut
down. The lead compressors continue to run as the EXV closes, and until the conditions of pumpout are satisfied. If a fault
condition is signaled requiring immediate shutdown, pumpout
is omitted.
Loading sequence for compressors is shown in Tables 5A
and 5B.

Consult application data section in the Product Data literature and job design requirements to determine flow rate requirements for a particular installation.
Table 36 — Nominal and Minimum Cooler
Fluid Flow Rates
UNIT SIZE
30GTN,R
AND 30GUN,R
040
045
050
060
070
080,230B
090,245B
100,255B,270B
110,290B,315B
130
150,230A-255A
170,270A,330A/B,
360B (50 Hz)
190,290A,360A/B (60 Hz),
360A (50 Hz), 390B
210,315A,390A,420A/B
ARI
Gpm
L/s
N
V

—
—
—
—
—

Gpm
86
101
123
151
173
192
216
240
264
300
348

L/s
5.43
6.37
7.76
9.53
10.91
12.11
13.62
15.14
16.65
18.9
21.9

MINIMUM
FLOW RATE
(See Notes)
Gpm
L/s
36.8
2.32
37.7
2.38
37.7
2.38
47.5
3.00
47.5
3.00
66.7
4.20
59.5
3.75
84.1
5.30
84.1
5.30
110
6.9
110
6.9

384

24.2

120

7.5

432

27.2

120

7.5

480

30.2

148

9.3

NOMINAL
FLOW RATE*

LEGEND
Air Conditioning and Refrigeration Institute
Gallons per minute (U.S.)
Liters per second
Liters per kW
Gallons per ton

Refrigerant Circuit
LEAK TESTING — Units are shipped with complete operating charge of refrigerant R-22 for 30GTN,R and R-134a for
30GUN,R (see Physical Data tables supplied in the chiller’s
installation instructions) and should be under sufficient pressure to conduct a leak test. If there is no pressure in the system,
introduce enough nitrogen to search for the leak. Repair the
leak using good refrigeration practices. After leaks are
repaired, system must be evacuated and dehydrated.
REFRIGERANT CHARGE (Refer to Physical Data tables
supplied in the chiller’s installation instructions) — Immediately ahead of filter drier in each circuit is a factory-installed
liquid line service valve. Each valve has a 1/4-in. Schrader connection for charging liquid refrigerant.
Charging with Unit Off and Evacuated — Close liquid line
service valve before charging. Weigh in charge shown on unit
nameplate (also in Physical Data tables supplied in the chiller’s
installation instructions). Open liquid line service valve; start
unit and allow it to run several minutes fully loaded. Check for
a clear sight glass. Be sure clear condition is liquid and not
vapor.
Charging with Unit Running — If charge is to be added while
unit is operating, all condenser fans and compressors must be
operating. It may be necessary to block condenser coils at low
ambient temperatures to raise condensing pressure to approximately 280 psig (1931 kPa) to turn all condenser fans on. Do
not totally block a coil to do this. Partially block all coils in uniform pattern. Charge each circuit until sight glass shows clear
liquid, then weigh in amount over a clear sight glass as listed
in Physical data tables supplied in chiller’s installation
instructions.

*Nominal flow rates required at ARI conditions are 44 F (6.7 C) leaving-fluid
temperature, 54 F (12.2 C) entering-fluid temperature, 95 F(35 C) ambient.
Fouling factor is .00001 ft2 ⋅ hr ⋅ F/Btu (.000018 m2 ⋅ K/W).
NOTES:
1. Minimum flow based on 1.0 fps (0.30 m/s) velocity in cooler without special
cooler baffling.
2. Minimum Loop Volumes:
Gallons = V x ARI Cap. in tons
Liters = N x ARI Cap. in kW
APPLICATION
Normal Air Conditioning
Process Type Cooling
Low Ambient Unit Operation

V
3
6 to 10
6 to 10

N
3.25
6.5 to 10.8
6.5 to 10.8

Operation Sequence — During unit off cycle, crankcase heaters are energized. If ambient temperature is below
36 F (2 C), cooler heaters (if equipped) are energized.
The unit is started by putting the ENABLE/OFF/REMOTE
CONTACT switch in ENABLE or REMOTE position. When
the unit receives a call for cooling (either from the internal
control or CCN network command or remote contact closure),
the unit stages up in capacity to maintain the cooler fluid set
point. The first compressor starts 11/2 to 3 minutes after the call
for cooling.
The lead circuit can be specifically designated or randomly
selected by the controls, depending on how the unit is field
configured (for 040-070 sizes, Circuit A leads unless an
accessory unloader is installed on Circuit B). A field configuration is also available to determine if the unit should stage up
both circuits equally or load one circuit completely before
bringing on the other.
When the lead circuit compressor starts, the unit starts with
a pumpout routine. On units with the electronic expansion
valve (EXV), compressor starts and continues to run with the
EXV at minimum position for 10 seconds to purge the refrigerant lines and cooler of refrigerant. The EXV then moves to
23% and the compressor superheat control routine takes over,
modulating the valve to feed refrigerant into the cooler.
On units with thermostatic expansion valve (TXV)
(30GTN,R and 30GUN,R 040,045 units with brine option),
head pressure control is based on set point control. When the
lead compressor starts, the liquid line solenoid valve (LLSV) is

IMPORTANT: When adjusting refrigerant charge, circulate fluid through cooler continuously to prevent freezing and possible damage to the cooler. Do not
overcharge, and never charge liquid into low-pressure
side of system.

FIELD WIRING
Field wiring is shown in Fig. 36-41.

67

LEGEND FOR FIG. 36-41
ALM
CWFS
CWP
CWPI
CXB
HGBPS
LWT
MBB
OAT
SPT
SW
TB
UL

1

—
—
—
—
—
—
—
—
—
—
—
—
—

Alarm
Chilled Water Flow Switch
Chilled Water Pump
Chilled Water Pump Interlock
Compressor Expansion Board
Hot Gas Bypass Switch
Leaving Fluid Temperature
Main Base Board
Outdoor-Air Temperature Sensor
Remote Space Temperature Sensor
Switch
Terminal Block
Unloader
Field Supplied Wiring
Factory Wiring

TB5
2

1

ORN

2
2

CWPI

3
3

10

9

4
5
5
6
BLU

6
7

5
TB5

PNK

7
8
8

PNK

REMOTE
ON-OFF SWITCH

RED

6

REMOTE
CONTACT

T9

TB5
7

SW1

TB5

8
8
MBB,
PLUG J7

7
C

RED

7

RED

B
RED

OAT ACCESSORY OR
DUAL CHILLER LWT.
(MASTER CHILLER)

9
9

RED

A

OFF

ENABLE

8

TB5
14

TB5
13

T10

TB5
BLU

9

ORN

SPT ACCESSORY

4
MBB,
PLUG J8

10

TB5
1

CWFS

6
4
TB5

DUAL SETPOINT
3

Fig. 36 — Accessory Sensor
Control Wiring

TB5

GRA

6

5
GRA

5

Fig. 37 — Control Wiring (24 V)

MAIN BASE BOARD

PLUG
J10A

1
1

2

K11

2

3

HGBPS-A

TB5

3
GRA

VIO

9

GRA

BLK
HGBPS-B

4
4

VIO

Fig. 38 — Hot Gas Bypass Control Wiring (115 V, 230 V)

68

GRA
GRA

12 TB5
HGBPS-B
12 TB5

2
15
K7

TB5

3

ALM
R

11

BLK

16

12

TB5

BLK
MAX LOAD-75VA SEALED
360VA INRUSH

4
17
MBB
5

18

K8

TB5

6
VIO

19

PLUG
J10B

CWP
R

10

12 TB5

MAX LOAD-75VA SEALED
360VA INRUSH

Fig. 39 — Chilled Water Pump Control Wiring and Remote Alarm 115 V Relay Wiring

EMM, PLUG J6

12 11 10

8
9

7
8

6
7

5
6

4
5

4

TB6 3

2
3

1
2

14 13
1

5

2

12 11 10

14 13 12 11 10

BRN VIO

ORN

PNK

3

9

8
9

7
8

6

5

7

6

BLU

-

+

4

2
3

1
2

1

RED
GRA
BLU
RED
GRA

-

+

4.20 MA
SIGNAL
GENERATOR

4.20 MA
SIGNAL
GENERATOR

4.20 MA
SIGNAL
GENERATOR

COOLING
SETPOINT

TEMPERATURE
RESET

DEMAND
LIMIT

14 13 12 10

DEMAND LIMIT STEP 2

+

5

3

1
TB6 15

-

4

9

FIELD SUPPLIED
DRY CONTACTS 24V

Fig. 40 — Energy Management Module (EMM) Wiring

69

ICE DONE

9

DEMAND LIMIT STEP 1

12 11 10

EMM, PLUG J7

CXB ACCESSORY

CXB ACCESSORY
GND
BLK
WHT
RED

4
3
2
1

1

1
4

2

2
3
2

J6

J4

3

3

UL-A2

4

4
1

5
5

CXB
BOARD

6

6

UL-B2

7

7

8

8

Fig. 41 — Compressor Expansion Board (CXB) Accessory Wiring

70

24V

115V/
230V

APPENDIX A — CCN TABLES
UNIT (Configuration Settings)
1

DESCRIPTION
Unit Type

2
3
4
5
6
7
8
9

Unit Size
Circuit A1% Capacity
Number Circ A Compressor
Compressor A1 Cylinders
Number Circ B Compressor
Compressor B1 Cylinders
EXV Module Installed
EXV Superheat Setpoint

10
11
12
13
14

EXV MOP
EXV Superheat Offset
EXV Circ. A Min Position
EXV Circ. B Min Position
Refrigerant

15
16

Low Pressure Setpoint
Fan Staging Select

STATUS
1 = Air Cooled
2 = Water Cooled
3 = Split System
4 = Heat Machine
5 = Air Cooled Heat Reclaim
20 to 300
0 to 100
1 to 4
4 or 6
1 to 4
4 or 6
No/Yes
10 to 40
40 to 80
–20 to 20
0 to 100
0 to 100
1 = R22
2 = R134A
3 to 60
1 = 2 Stage indpt.
2 = 3 Stage indpt.
3 = 2 Stage common
4 = 3 Stage common

DEFAULT

UNITS

POINT
UNIT_TYP

*
*
*
*
*
*
Yes
29.0 (30GTN,R)
23.0 (30GUN,R)
50.0
0.0
8.0
8.0
1 (30GTN,R)
2 (30GUN,R)
10.0
*

TONS
%

SIZE
CAP_A
NUMCA
NUM_CYLA
NUMCB
NUM_CYLB
EXV_BRD
SH_SP

1

^F
°F
^F
%
%

MOP_SP
SH_OFFST
EXVAMINP
EXVBMINP
REFRIG_T

PSI

LOW_PRES
FAN_TYPE

OPTIONS1 (Options Configuration)
1

DESCRIPTION
Cooler Fluid

2
3

Hot Gas Bypass Select
Head Press. Cont. Method

4

Head Press. Control Type

5
6
8
9
10

Motormaster Select
Pressure Transducers
Cooler Pump Control
Condenser Pump Interlock
Condenser Pump Control

11
12
13
14

Condenser Fluid Sensors
No. Circuit A Unloaders
No. Circuit B Unloaders
EMM Module Installed

STATUS
1 = Water
2 = Med. Brine
3 = Low Brine
No/Yes
1 = EXV controlled
2 = Setpoint control
3 = Setpoint-A, EXV-B
4 = EXV-A, Setpoint-B
0 = None
1 = Air Cooled
2 = Water Cooled
No/Yes
Off/On
Off/On
Off/On
0 = No control
1 = On with Mode
2 = On with Compressors
No/Yes
0-2
0-2
No/Yes

*Unit size dependent.

71

DEFAULT
1

POINT
FLUIDTYP

No
2

HGBV_FLG
HEAD_MET

1

HEAD_TYP

No
Off
Off
Off
0

MTR_TYPE
PRESS_TY
CPC
CND_LOCK
CNPC

No
*
*
No

CD_TEMP
NUNLA
NUNLB
EMM_BRD

APPENDIX A — CCN TABLES (cont)
CONFIGURATION SCREEN (TYPE 10)
OPTIONS2 (Options Configuration)
1

DESCRIPTION
Control Method

2

Loading Sequence Select

3

Lead/Lag Circuit Select

4

Cooling Setpoint Select

5

Heating Setpoint Select

6
7
8
9
10
11

STATUS
0 = Switch
1 = 7 day sched.
2 = Occupancy
3 = CCN
1 = Equal loading
2 = Staged loading
1 = Automatic
2 = Circuit A leads
3 = Circuit B leads
0 = Single
1 = Dual, remote switch controlled
2 = Dual, 7-day occupancy
3 = Dual CCN occupancy
4 = 4-20 mA input
5 = External POT
0 = Single
1 = Dual, remote switch controlled
2 = Dual, 7 day occupancy
3 = Dual CCN occupancy
4 = 4-20 mA input
Enable/Disable
Cool/Heat
2 to 60
0 to 15
1.0 to 4.0
Enable/Disable

Ramp Load Select
Heat Cool Select
High LCW Alert Limit
Minutes off time
Deadband Multiplier
Ice Mode Enable

DEFAULT
0

UNITS

POINT
CONTROL

1

SEQ_TYPE

*

LEAD_TYP

0

CLSP_TYP

0

HTSP_TYP

Disable
Cool
60.0
0
1.0
Disable

RAMP_EBL
HEATCOOL
LCW_LMT
DELAY
Z_GAIN
ICE_CNFG

^F
min

DISPLAY (STDU SETUP)
1
2
3
4

DESCRIPTION
Service Password
Password Enable
Metric Display
Language Selection

STATUS
nnnn
Enable/Disable
Off/On
0 = ENGLISH
1 = FRANCAIS
2 = ESPANOL
3 = PORTUGUES

DEFAULT
1111
Enable
Off
0

UNITS

POINT
PASSWORD
PASS_EBL
DISPUNIT
LANGUAGE

SCHEDOVR (TIMED OVERRIDE SETUP)
1
2
3
4

DESCRIPTION
Schedule Number
Override Time Limit
Timed Override Hours
Timed Override

STATUS
0-99
0-4
0-4
Yes/No

DEFAULT
0
0
0
No

UNITS
hours
hours

POINT
SCHEDNUM
OTL
OTL_EXT
TIMEOVER

ALARMDEF (Alarm Definition Table)
1
2
3
4
5

DESCRIPTION
Alarm Routing Control
Equipment Priority
Comm Failure Retry Time
Re-alarm Time
Alarm System Name

STATUS
00000000
0 to 7
1 to 240
1 to 255
XXXXXXXX

*Unit size dependent.

72

DEFAULT
00000000
4
10
30
Chiller

UNITS

min
min

POINT
ALRM_CNT
EQP_TYPE
RETRY_TM
RE-ALARM
ALRM_NAM

APPENDIX A — CCN TABLES (cont)
RESETCON (Temperature Reset and Demand Limit)
1
2

3
4
5
6
7
8

9
10
11
12
13
14

15
16
17
18
19
20
21
22
23
24
25
26
27
28

DESCRIPTION
COOLING RESET
Cooling Reset Type

STATUS

DEFAULT

0 = No Reset
1 = 4-20 ma input
2 = External temp-OAT
3 = Return fluid
4 = External temp-SPT
0 to 125
0 to 125
–30 to 30

No Cool Reset Temp
Full Cool Reset Temp
Degrees Cool Reset
HEATING RESET
Heating Reset Type

0

DEMAND LIMIT
Demand Limit Select

Demand Limit at 20 mA
Loadshed Group Number
Loadshed Demand Delta
Maximum Loadshed Time
Demand Limit Switch 1
Demand Limit Switch 2
LEAD/LAG
Lead/Lag Chiller Enable
Master/Slave Select
Slave Address
Lead/Lag Balance Select
Lead/Lag Balance Delta
Lag Start Delay

°F
°F
^F

0

%
min

0

100
0
0
60
80
50

Enable/Disable
Slave/Master
0 to 239
Enable/Disable
40 to 400
0 to 30

Disable
Master
0
Disable
168
5

CT_NO
CT_FULL
CT_DEG

HRST_TYP

0.0
125.0
0.0

0 = None
1 = External switch input
2 = 4-20 ma input
3 = Loadshed
0 to 100
0 to 99
0 to 60
0 to 120
0 to 100
0 to 100

POINT
CRST_TYP

125.0
0.0
0.0

0 = No Reset
1 = 4-20 ma input
2 = External temp — OAT
3 = Return fluid
4 = External temp — SPT
0 to 125
0 to 125
–30 to 30

No Heat Reset Temp
Full Heat Reset Temp
Degrees Heat Reset

UNITS

HT_NO
HT_FULL
HT_DEG

DMD_CTRL

%
%
min
%
%

DMT20MA
SHED_NUM
SHED_DEL
SHED_TIM
DLSWSP1
DLSWSP2

hours
mins

LL_ENA
MS_SEL
SLV_ADDR
LL_BAL
LL_BAL_D
LL_DELAY

BRODEFS (Broadcast POC Definition Table)
1
2
3
4
5
6
7
8
9
10
11
12
13
14

DESCRIPTION
CCN Time/Date Broadcast
CCN OAT Broadcast
Global Schedule Broadcast
CCN Broadcast Acker
Daylight Savings Start
Month
Week
Day
Minutes to add
Daylight Savings Stop
Month
Week
Day
Minutes to subtract

STATUS
Yes/No
Yes/No
Yes/No
Yes/No

DEFAULT
No
No
No
No

1 to 12
1 to 5
1 to 7
0 to 99

4
1
7
60

1 to 12
1 to 5
1 to 7
0 to 99

10
5
7
60

73

UNITS

POINT
CCNBC
OATBC
GSBC
CCNBCACK

min

STARTM
STARTW
STARTD
MINADD

min

STOPM
STOPW
STOPD
MINSUB

APPENDIX A — CCN TABLES (cont)
A_UNIT (General Unit Parameters)
1

2
3
4
5
6
7
8
9
10
11
12
13
14
15

DESCRIPTION
Control Mode

Occupied
CCN Chiller
Alarm State
Active Demand Limit
Override Modes in Effect
Percent Total Capacity
Requested Stage
Active Setpoint
Control Point
Entering Fluid Temp
Leaving Fluid Temp
Emergency Stop
Minutes Left for Start
Heat Cool Select

STATUS
0 = Service
1 = OFF - local
2 = OFF-CCN
3 = OFF-time
4 = Emergency
5 = ON-local
6 = ON-CCN
7 = ON-time
Yes/No
Start/Stop
Normal
0-100
Yes/No
0-100
nn
snnn.n
snnn.n
snnn.n
snnn.n
Enable/Emstop
nn
Heat/Cool

UNITS

POINT
STAT

OCC
CHIL_S_S
ALM
DEM_LIM
MODE
CAP_T
STAGE
SP
CTRL_PNT
EWT
LWT
EMSTOP
MIN_LEFT
HEATCOOL

%
%
°F
°F
°F
°F
min

FORCEABLE
N

N
Y
N
Y
N
N
N
N
Y
N
N
Y
N
Y

CIRCA_AN (Circuit A Analog Parameters)
1
2
3
4
5
6
7
8
9
10

DESCRIPTION
Circuit A Analog Values
Percent Total Capacity
Percent Available Cap
Discharge Pressure
Suction Pressure
Saturated Condensing Tmp
Saturated Suction Temp
Compressor Suction Temp
Suction Superheat Temp
EXV % Open

STATUS
0-100
0-100
nnn.n
nnn.n
snnn.n
snnn.n
snnn.n
snnn.n
0-100.0

UNITS

POINT

%
%
PSI
PSI
°F
°F
°F
^F
%

CAPA_T
CAPA_A
DP_A
SP_A
TMP_SCTA
TMP_SSTA
CTA_TMP
SH_A
EXV_A

FORCEABLE
N
N
N
N
N
N
N
N
N

CIRCA_DIO (Circuit A Discrete Parameters)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

DESCRIPTION
CIRC. A DISCRETE OUTPUTS
Compressor A1 Relay
Compressor A2 Relay
Compressor A3 Relay
Compressor A4 Relay
Unloader A1 Relay
Unloader A2 Relay
Liq. Line Solenoid Valve
Hot Gas Bypass Relay
CIRC. A DISCRETE INPUTS
Compressor A1 Feeback
Compressor A2 Feedback
Compressor A3 Feedback
Compressor A4 Feedback
Oil Pressure Switch A
Low Pressure Switch A

STATUS

POINT

FORCEABLE

ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
OPEN/CLOSE
ON/OFF

K_A1_RLY
K_A2_RLY
K_A3_RLY
K_A4_RLY
UNL_A1
UNL_A2
LLSV_A
HGB

N
N
N
N
N
N
N
N

ON/OFF
ON/OFF
ON/OFF
ON/OFF
OPEN/CLOSE
OPEN/CLOSE

K_A1_FBK
K_A2_FBK
K_A3_FBK
K_A4_FBK
OILSW_A
LPS_A

N
N
N
N
N
N

74

UNITS

APPENDIX A — CCN TABLES (cont)
CIRCB_AN (Circuit B Analog Parameters)
1
2
3
4
5
6
7
8
9
10

DESCRIPTION
Circuit B Analog Values
Percent Total Capacity
Percent Available Cap
Discharge Pressure
Suction Pressure
Saturated Condensing Tmp
Saturated Suction Temp
Compressor Suction Temp
Suction Superheat Temp
EXV % Open

STATUS
0-100
0-100
nnn.n
nnn.n
snnn.n
snnn.n
snnn.n
snnn.n
0-100.0

UNITS

POINT

%
%
PSI
PSI
°F
°F
°F
^F
%

CAPB_T
CAPB_A
DP_B
SP_B
TMP_SCTB
TMP_SSTB
CTB_TMP
SH_B
EXV_B

FORCEABLE
N
N
N
N
N
N
N
N
N

CIRCBDIO (Circuit B Discrete Parameters)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

DESCRIPTION
CIRC. B DISCRETE OUTPUTS
Compressor B1 Relay
Compressor B2 Relay
Compressor B3 Relay
Compressor B4 Relay
Unloader B1 Relay
Unloader B2 Relay
Liq. Line Solenoid Valve
Hot Gas Bypass Relay
CIRC. B DISCRETE INPUTS
Compressor B1 Feedback
Compressor B2 Feedback
Compressor B3 Feedback
Compressor B4 Feedback
Oil Pressure Switch B
Low Pressure Switch B

STATUS

POINT

FORCEABLE

ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF

K_B1_RLY
K_B2_RLY
K_B3_RLY
K_B4_RLY
UNL_B1
UNL_B2
LLSV_B
HGB

N
N
N
N
N
N
N
N

ON/OFF
ON/OFF
ON/OFF
ON/OFF
OPEN/CLOSE
OPEN/CLOSE

K_B1_FBK
K_B2_FBK
K_B3_FBK
K_B4_FBK
OILSW_B
LPS_B

N
N
N
N
N
N

75

UNITS

APPENDIX A — CCN TABLES (cont)
OPTIONS (Unit Parameters)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34

DESCRIPTION
FANS
Fan 1 Relay
Fan 2 Relay
Fan 3 Relay
Fan 4 Relay

STATUS
ON/OFF
ON/OFF
ON/OFF
ON/OFF

UNIT ANALOG VALUES
Cooler Entering Fluid
Cooler Leaving Fluid
Condensing Entering Fluid
Condenser Leaving Fluid
Lead/Lag Leaving Fluid

snnn.n
snnn.n
snnn.n
snnn.n
snnn.n

TEMPERATURE RESET
4-20 mA Reset Signal
Outside Air Temperature
Space Temperature

nn.n
snnn.n
snnn.n

UNITS

POINT

FORCEABLE

FAN_1
FAN_2
FAN_3
FAN_4

N
N
N
N

°F
°F
°F
°F
°F

COOL_EWT
COOL_LWT
COND_EWT
COND_LWT
DUAL_LWT

N
N
N
N
N

mA
°F
°F

RST_MA
OAT
SPT

N
Y
Y

n.nn
ON/OFF
ON/OFF
0 = Normal
1 = Redline
2 = Shed

LMT_MA
DMD_SW1
DMD_SW2
OL_STAT

N
N
N
N

PUMPS
Cooler Pump Relay
Condenser Pump Relay

ON/OFF
ON/OFF

COOL_PMP
COND_PMP

N

MISCELLANEOUS
Dual Setpoint Switch
Cooler LWT Setpoint
Cooler Flow Switch
Condenser Flow Switch
Ice Done

ON/OFF
snn.n
ON/OFF
ON/OFF
ON/OFF

DUAL_IN
LWR_SP
COOLFLOW
CONDFLOW
ICE

N
N
N
N
N

DEMAND LIMIT
4-20 mA Demand Signal
Demand Limit Switch 1
Demand Limit Switch 2
CCN Loadshed Signal

76

°F

APPENDIX A — CCN TABLES (cont)
STRTHOUR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

DESCRIPTION
Machine Operating Hours
Machine Starts

STATUS
nnnnn
nnnnn

UNITS
hours

POINT
HR_MACH
CY_MACH

Circuit A Run Hours
Compressor A1 Hours
Compressor A2 Hours
Compressor A3 Hours
Compressor A4 Hours
Circuit B Run Hours
Compressor B1 Hours
Compressor B2 Hours
Compressor B3 Hours
Compressor B4 Hours

nnnnn
nnnnn
nnnnn
nnnnn
nnnnn
nnnnn
nnnnn
nnnnn
nnnnn
nnnnn

hours
hours
hours
hours
hours
hours
hours
hours
hours
hours

HR_CIRA
HR_A1
HR_A2
HR_A3
HR_A4
HR_CIRB
HR_B1
HR_B2
HR_B3
HR_B4

Circuit A Starts
Compressor A1 Starts
Compressor A2 Starts
Compressor A3 Starts
Compressor A4 Starts
Circuit B Starts
Compressor B1 Starts
Compressor B2 Starts
Compressor B3 Starts
Compressor B4 Starts

nnnnn
nnnnn
nnnnn
nnnnn
nnnnn
nnnnn
nnnnn
nnnnn
nnnnn
nnnnn

CY_CIRA
CY_A1
CY_A2
CY_A3
CY_A4
CY_CIRB
CY_B1
CY_B2
CY_B3
CY_B4

ALARMS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

DESCRIPTION
Active Alarm #1
Active Alarm #2
Active Alarm #3
Active Alarm #4
Active Alarm #5
Active Alarm #6
Active Alarm #7
Active Alarm #8
Active Alarm #9
Active Alarm #10
Active Alarm #11
Active Alarm #12
Active Alarm #13
Active Alarm #14
Active Alarm #15
Active Alarm #16
Active Alarm #17
Active Alarm #18
Active Alarm #19
Active Alarm #20
Active Alarm #21
Active Alarm #22
Active Alarm #23
Active Alarm #24
Active Alarm #25

STATUS
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx
Axxx or Txxx

NOTE: Alerts will displayed as Txxx.

77

UNITS

POINT
ALARM01C
ALARM02C
ALARM03C
ALARM04C
ALARM05C
ALARM06C
ALARM07C
ALARM08C
ALARM09C
ALARM10C
ALARM11C
ALARM12C
ALARM13C
ALARM14C
ALARM15C
ALARM16C
ALARM17C
ALARM18C
ALARM19C
ALARM20C
ALARM21C
ALARM22C
ALARM23C
ALARM24C
ALARM25C

APPENDIX A — CCN TABLES (cont)
CURRMODS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

DESCRIPTION
FSM controlling chiller
WSM controlling chiller
Master/Slave control
Low source protection
Ramp Load Limited
Timed Override in effect
Low Cooler Suction TempA
Low Cooler Suction TempB
Slow Change Override
Minimum OFF Time
Low Suction Superheat A
Low Suction Superheat B
Dual Setpoint
Temperature Reset
Demand Limit in effect
Cooler Freeze Prevention
Lo Tmp Cool/Hi Tmp Heat
Hi Tmp Cool/Lo Tmp Heat
Making Ice
Storing Ice
High SCT Circuit A
High SCT Circuit B

STATUS
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF
ON/OFF

UNITS

POINT
MODE_1
MODE_2
MODE_3
MODE_4
MODE_5
MODE_6
MODE_7
MODE_8
MODE_9
MODE_10
MODE_11
MODE_12
MODE_13
MODE_14
MODE_15
MODE_16
MODE_17
MODE_18
MODE_19
MODE_20
MODE_21
MODE_22

SETPOINT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

DESCRIPTION
COOLING
Cool Setpoint 1
Cool Setpoint 2
Ice Setpoint

STATUS

UNITS

POINT

DEFAULTS

–20 to 70
–20 to 70
–20 to 32

°F
°F
°F

CSP1
CSP2
CSP3

44
44
32

HEATING
Heat Setpoint 1
Heat Setpoint 2

80 to 140
80 to 140

°F
°F

HSP1
HSP2

100
100

RAMP LOADING
Cooling Ramp Loading
Heating Ramp Loading

0.2 to 2.0
0.2 to 2.0

°F/min
°F/min

CRAMP
HRAMP

1.0
1.0

HEAD PRESSURE
Head Pressure Setpoint A
Head Pressure Setpoint B

80 to 140
80 to 140

°F
°F

HSP_A
HSP_B

113
113

LOADFACT
1
2
3
4

DESCRIPTION
CAPACITY CONTROL
Load/Unload Factor
Control Point
Leaving Water Temp

STATUS
snnn.n
snnn.n
snnn.n

UNITS

POINT

%
°F
°F

SMZ
CTRL_PNT
LWT

VERSIONS
1
2
3
4
5
6

DESCRIPTION
MBB
EXV
CXB
EMM
MARQ
NAV

STATUS
CESR-131170 nn-nn
CESR-131172 nn-nn
CESR131173- nn-nn
CESR131174- nn-nn
CESR131171- nn-nn
CESR131227- nn-nn

78

UNITS

POINT

APPENDIX A — CCN TABLES (cont)
CSM/FSM EQUIPMENT TABLE (Type 621H, Block 2)
LINE
1

DESCRIPTION
Chiller Status
0 = Chiller is off
1 = Valid run state in CCN mode
2 = Recycle active
3 = Chiller is in Local Mode
4 = Power Fail Restart in Progress
5 = Shutdown due to fault
6 = Communication Failure
Lag Status
Percent Total Capacity Running
Service Runtime
unused
unused
unused
Power Fail Auto Restart
Percent Available Capacity On

2
3
4
5
6
7
8
9

POINT
CHILSTAT

LAGSTAT
CAP_T
HR_MACH

ASTART
CAP_A

WSM EQUIPMENT PART COOL SOURCE MAINTENANCE TABLE
SUPERVISOR MAINTENANCE TABLE
DESCRIPTION
WSM Active?
Chilled water temp
Equipment status
Commanded state
CHW setpoint reset value
Current CHW setpoint

STATUS
Yes
snn.n °F
On
Enable/Disable/None
nn.n^F
snn.n °F

POINT
WSMSTAT
CHWTEMP
CHLRST
CHLRENA
CHWRVAL
CHWSTPT

OCCUPANCY MAINTENANCE TABLE
OCCUPANCY SUPERVISORY
DESCRIPTION
Current Mode (1=Occup.)
Current Occup. Period #
Timed-Override in Effect
Time-Override Duration
Current Occupied Time
Current Unoccupied Time
Next Occupied Day
Next Occupied Time
Next Unoccupied Day
Next Unoccupied Time
Previous Unoccupied Day
Previous Unoccupied Time

STATUS
0,1
0-8
Yes/No
0-4 hours
hh:mm
hh:mm
hh:mm
hh:mm
hh:mm

79

POINT
MODE
PER-NO
OVERLAST
OVR_HRS
STRTTIME
ENDTIME
NXTOCDAY
NXTOCTIM
NXTUNDAY
NXTUNTIM
NXTUNDAY
PRVUNTIM

APPENDIX B — FLUID DROP PRESSURE CURVES
Cooler Fluid Pressure Drop Curves — 30GUN,GUR040-110
ENGLISH AND SI




LEGEND




— 040
— 045,050

NOTE: Ft of water = 2.31 x change in psig.

80

APPENDIX B — FLUID DROP PRESSURE CURVES (cont)
Cooler Fluid Pressure Drop Curves — 30GUN,GUR130-210
ENGLISH

SI

COOLER PRESSURE DROP KEY
1 — 30GUN,GUR130,150
2 — 30GUN,GUR170,190
3 — 30GUN,GUR210
NOTE: Ft of water = 2.31 x change in psig.

81

APPENDIX B — FLUID DROP PRESSURE CURVES (cont)
Cooler Fluid Pressure Drop Curves — 30GUN,GUR230A-255A, 270A/B-420A/B
ENGLISH

SI

COOLER PRESSURE DROP KEY
1 Module B — 30GUN,GUR270
2 Module A — 30GUN,GUR230-255
3 Module A — 30GUN,GUR270,330
Module B — 30GUN,GUR330,360 (50 Hz)
4 Module A — 30GUN,GUR290,315,360 (50 or 60 Hz), 390, and 420
Module B — 30GUN,GUR360 (60 Hz), 390, and 420

82

APPENDIX B — FLUID DROP PRESSURE CURVES (cont)
Cooler Fluid Pressure Drop Curves — 30GUN,GUR230B-315B
ENGLISH AND SI

COOLER PRESSURE DROP KEY
1 Module B — 30GUN,GUR230,245
2 Module B — 30GUN,GUR255,290,315
NOTE: Ft of water = 2.31 x change in psig.

83

APPENDIX B — FLUID DROP PRESSURE CURVES (cont)
Cooler Fluid Pressure Drop Curves — 30GTN,GTR040-110
ENGLISH AND SI




LEGEND




— 040
— 045,050

NOTE: Ft of water = 2.31 x change in psig.

84

APPENDIX B — FLUID DROP PRESSURE CURVES (cont)
Cooler Fluid Pressure Drop Curves — 30GTN,GTR130-210
ENGLISH

SI

COOLER PRESSURE DROP KEY
1 — 30GTN,GTR130,150
2 — 30GTN,GTR170,190
3 — 30GTN,GTR210
NOTE: Ft of water = 2.31 x change in psig.

85

APPENDIX B — FLUID DROP PRESSURE CURVES (cont)
Cooler Fluid Pressure Drop Curves — 30GTN,GTR230A-420A, 270B, 330B-420B
ENGLISH

SI

COOLER PRESSURE DROP KEY
1 Module B — 30GTN,GTR270
2 Module A — 30GTN,GTR230-255
3 Module A — 30GTN,GTR270,330
Module B — 30GTN,GTR330,360 (50 Hz)
4 Module A — 30GTN,GTR290,315,360 (50 or 60 Hz), 390, and 420
Module B — 30GTN,GTR360 (60 Hz), 390, and 420

86

APPENDIX B — FLUID DROP PRESSURE CURVES (cont)
Cooler Fluid Pressure Drop Curves — 30GTN,GTR230B, 245B, 255B, 290B, 315B
ENGLISH AND SI

COOLER PRESSURE DROP KEY
1 Module B — 30GTN,GTR230,245
2 Module B — 30GTN,GTR255,290,315
NOTE: Ft of water = 2.31 x change in psig.

87

SERVICE TRAINING

Packaged Service Training programs are an excellent way to increase your knowledge of the equipment
discussed in this manual, including:
• Unit Familiarization
• Maintenance
• Installation Overview
• Operating Sequence
A large selection of product, theory, and skills programs are available, using popular video-based
formats and materials. All include video and/or slides, plus companion book.
Classroom Service Training which includes “hands-on” experience with the products in our labs can
mean increased confidence that really pays dividends in faster troubleshooting and fewer callbacks. Course
descriptions and schedules are in our catalog.
CALL FOR FREE CATALOG 1-800-962-9212
[ ] Packaged Service Training

[ ] Classroom Service Training

Copyright 2000 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 903
Catalog No. 563-025
Printed in U.S.A.
Form 30GTN-3T
Pg 88
3-00
Replaces: 30GTN-2T
Book 2
Tab 5c

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-----------------------------------------------------------------------------------------------------------------------------------------------------------------

START-UP CHECKLIST FOR COMFORTLINK™ CHILLER SYSTEMS
(Remove and use for job file)
A. Preliminary Information
JOB NAME _______________________________________________________________________________
LOCATION _______________________________________________________________________________
INSTALLING CONTRACTOR _________________________________________________________________
DISTRIBUTOR ____________________________________________________________________________
START-UP PERFORMED BY _________________________________________________________________
EQUIPMENT:

Chiller:

SERIAL NO.

MODEL NO.

COMPRESSORS:
CIRCUIT A

CIRCUIT B

1) MODEL NO.

1) MODEL NO.

SERIAL NO.

SERIAL NO.

MTR NO.

MTR NO.

2) MODEL NO.

2) MODEL NO.

SERIAL NO.

SERIAL NO.

MTR NO.

MTR NO.

3) MODEL NO.

3) MODEL NO.

SERIAL NO.

SERIAL NO.

MTR NO.

MTR NO.

4) MODEL NO.
SERIAL NO.
MTR NO.
COOLER:
MODEL NO.

MANUFACTURED BY

SERIAL NO.

DATE

TYPE OF EXPANSION VALVES (check one):

EXV

TXV

AIR-HANDLING EQUIPMENT:
MANUFACTURER
MODEL NO.

SERIAL NO.

ADDITIONAL AIR-HANDLING UNITS AND ACCESSORIES

Book
Tab

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
2
PC 903
Catalog No. 563-025
Printed in U.S.A.
Form 30GTN-3T
Pg CL-1
3-00
Replaces: 30GTN-2T
5c

B. Preliminary Equipment Check (Check box if complete)
IS THERE ANY SHIPPING DAMAGE?

IF SO, WHERE

_________________________________________________________________________________________
WILL THIS DAMAGE PREVENT UNIT START-UP?

 HAVE COMPRESSOR BASE RAIL ISOLATORS ALL BEEN PROPERLY ADJUSTED?
 CHECK POWER SUPPLY. DOES IT AGREE WITH UNIT?
 HAS THE CIRCUIT PROTECTION BEEN SIZED AND INSTALLED PROPERLY?
(refer to Installation Instructions)

 ARE THE POWER WIRES TO THE UNIT SIZED AND INSTALLED PROPERLY?
(refer to Installation Instructions)

 HAS THE GROUND WIRE BEEN CONNECTED?
 ARE ALL TERMINALS TIGHT?
CHECK AIR SYSTEMS

(Check box if complete)

 ALL AIR HANDLERS OPERATING? (refer to air-handling equipment Installation and Start-Up Instructions)
 ALL CHILLED FLUID VALVES OPEN?
 ALL FLUID PIPING CONNECTED PROPERLY?
 ALL AIR BEEN VENTED FROM THE COOLER LOOP?
 CHILLED WATER (FLUID) PUMP (CWP) OPERATING WITH THE CORRECT ROTATION?
CWP MOTOR AMPERAGE:

Rated

Actual

PUMP PRESSURE:

Inlet

Outlet

C. Unit Start-Up (insert check mark as each item is completed)

 CHILLER HAS BEEN PROPERLY INTERLOCKED WITH THE AUXILIARY CONTACTS OF THE CHILLED
FLUID PUMP STARTER.

 UNIT IS SUPPLIED WITH CORRECT CONTROL VOLTAGE POWER

(115 V FOR 208/230, 460, AND 575 V UNITS; 230 V FOR 380 AND 380/415 UNITS)

 CRANKCASE HEATERS HAVE BEEN ENERGIZED FOR A MINIMUM OF 24 HOURS PRIOR TO START-UP.
 COMPRESSOR OIL LEVEL IS CORRECT.
 BOTH LIQUID LINE SERVICE VALVES ARE BACKSEATED.
 ALL COMPRESSOR DISCHARGE SERVICE VALVES ARE BACKSEATED.
 ALL COMPRESSOR SUCTION SERVICE VALVES ARE BACKSEATED.
 LOOSEN COMPRESSOR SHIPPING HOLDDOWN BOLTS.
 LEAK CHECK THOROUGHLY: CHECK ALL COMPRESSORS, CONDENSER MANIFOLDS AND HEADERS,
EXVs, TXVs, SOLENOID VALVES, FILTER DRIERS, FUSIBLE PLUGS, THERMISTORS, AND COOLER
HEADS, WITH ELECTRONIC LEAK DETECTOR.

LOCATE, REPAIR, AND REPORT ANY REFRIGERANT LEAKS.

CL-2

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C. Unit Start-Up (cont)

 CHECK VOLTAGE IMBALANCE:

AB

AC

AB + AC + BC (divided by 3) = AVERAGE VOLTAGE =

BC
V

MAXIMUM DEVIATION FROM AVERAGE VOLTAGE =
VOLTAGE IMBALANCE =

(MAX. DEVIATION)
AVERAGE VOLTAGE

x 100 =

% VOLTAGE IMBALANCE

IF OVER 2% VOLTAGE IMBALANCE, DO NOT ATTEMPT TO START CHILLER!
CALL LOCAL POWER COMPANY FOR ASSISTANCE.

 INCOMING POWER VOLTAGE TO CHILLER MODULES IS WITHIN RATED UNIT VOLTAGE
RANGE.

SYSTEM FLUID VOLUME IN LOOP: TYPE SYSTEM:
AIR CONDITIONING — MINIMUM 3 GAL PER NOMINAL TON (3.25 L PER kW) =
PROCESS COOLING — MINIMUM 6 GAL PER NOMINAL TON (6.50 L PER kW) =

GAL (L)
GAL (L)

CHECK PRESSURE DROP ACROSS COOLER.
FLUID ENTERING COOLER:

PSIG (kPa)

FLUID LEAVING COOLER:

PSIG (kPa)

(PSIG DIFFERENCE) x 2.31 = FT OF FLUID PRESSURE DROP =
PLOT COOLER PRESSURE DROP ON PERFORMANCE DATA CHART (LOCATED IN PRODUCT DATA
LITERATURE) TO DETERMINE TOTAL GPM (L/s).
TOTAL GPM (L/s) =

UNIT’S RATED MIN GPM (L/s) =

GPM (L/s) PER TON =

UNIT’S RATED MIN PRESSURE DROP =
(Refer to product data literature.)

JOB’S SPECIFIED GPM (L/s) (if available):
NOTE: IF UNIT HAS LOW FLUID FLOW, FIND SOURCE OF PROBLEM: CHECK FLUID PIPING, IN-LINE
FLUID STRAINER, SHUT-OFF VALVES, CWP ROTATION, ETC.
COOLER LOOP FREEZE PROTECTION IF REQUIRED:
GALLONS (LITERS) ADDED:
PIPING INCLUDES ELECTRIC TAPE HEATERS (Y/N):
VISUALLY CHECK MAIN BASE BOARD AND EXV BOARD FOR THE FOLLOWING:

 INSPECT ALL THERMISTORS AND EXV CABLES FOR POSSIBLE CROSSED WIRES.
 CHECK TO BE SURE ALL WELL-TYPE THERMISTORS ARE FULLY INSERTED INTO THEIR
RESPECTIVE WELLS.

 ALL CABLES AND PIN CONNECTORS TIGHT?
 ALL EXV, EMM, AND CXB BOARDS (IF INSTALLED) AND DISPLAY CONNECTIONS TIGHT?

CL-3

C. Unit Start-Up (cont)
UNIT (Configuration Settings)
ITEM
TYPE

DESCRIPTION
Unit Type

TONS
CAP.A
CMP.A
CYL.A
CMP.B
CYL.B
EXV
SH.SP
SH.OF
REFG
FAN.S

Unit Size
Circuit A1% Capacity
Number Circ A Compressor
Compressor A1 Cylinders
Number Circ B Compressor
Compressor B1 Cylinders
EXV Module Installed
EXV Superheat Setpoint
EXV Superheat Offset
Refrigerant
Fan Staging Select

STATUS
1 = Air Cooled
2 = Water Cooled
3 = Split System
4 = Heat Machine
5 = Air Cooled Heat Reclaim
15 to 300
0 to 100
1 to 4
4 or 6
1 to 4
4 or 6
No/Yes
10 to 40
–20 to 20
1 = R22 2 = R134A
1 = 2 Stage indpt.
2 = 3 Stage indpt.
3 = 2 Stage common
4 = 3 Stage common

UNITS

VALUE

TONS
%

^F
^F

PRESS ESCAPE KEY TO DISPLAY ‘UNIT’. PRESS DOWN ARROW KEY TO DISPLAY ‘OPT1’.
PRESS ENTER KEY. RECORD CONFIGURATION INFORMATION BELOW:
OPTIONS1 (Options Configuration)
ITEM
FLUD

DESCRIPTION
Cooler Fluid

HGB.S
HPCM

Hot Gas Bypass Select
Head Press. Cont. Method

HPCT

Head Press. Control Type

MMR.S
PRTS
PMP.I
CPC
CNP.I
CNPC

Motormaster Select
Pressure Transducer
Cooler Pump Interlock
Cooler Pump Control
Condenser Pump Interlock
Condenser Pump Control

CWT.S
CA.UN
CB.UN
EMM

Condenser Fluid Sensors
No. Circuit A Unloaders
No. Circuit B Unloaders
EMM Module Installed

STATUS
1 = Water
2 = Med. Brine
3 = Low Brine
No/Yes
1 = EXV controlled
2 = Setpoint controlled
3 = Setpoint-A, EXV-B
4 = EXV-A, Setpoint-B
0 = None
1 = Air Cooled
2 = Water Cooled
No/Yes
No/Yes
Off/On
Off/On
Off/On
0 = No Control
1 = On with Mode
2 = On with Compressor(s)
No/Yes
0-2
0-2
No/Yes

CL-4

VALUE

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C. Unit Start-Up (cont)
PRESS ESCAPE KEY TO DISPLAY ‘OPT1’. PRESS DOWN ARROW KEY TO DISPLAY ‘OPT2’.
PRESS ENTER KEY.
RECORD CONFIGURATION INFORMATION BELOW:
OPTIONS2 (Options Configuration)
ITEM
CTRL

DESCRIPTION
Control Method

CCNA
CCNB
BAUD

CCN Address
CCN Bus Number
CCN Baud Rate

LOAD

Loading Sequence Select

LLCS

Lead/Lag Circuit Select

LCWT
DELY
ICE.M

High LCW Alert Limit
Minutes off time
Ice Mode Enable

STATUS
0 = Switch
1 = 7 day sched.
2 = Occupancy
3 = CCN
1 to 239
0 to 239
1 = 240
2 = 480
3 = 9600
4 = 19,200
5 = 38,400
1 = Equal loading
2 = Staged loading
1 = Automatic
2 = Circuit A leads
3 = Circuit B leads
2 to 60
0 to 15
Enable/Disable

UNITS

VALUE

^F
min.

PRESS ESCAPE KEY TO DISPLAY ‘OPT2’. PRESS DOWN ARROW KEY TO DISPLAY ‘RSET’.
PRESS ENTER KEY.
RECORD CONFIGURATION INFORMATION BELOW:
RESETCON (Temperature Reset and Demand Limit)
ITEM
CRST

DESCRIPTION
COOLING RESET
Cooling Reset Type

CRT1
CRT2
DGRC
HRST

No Cool Reset Temp
Full Cool Reset Temp
Degrees Cool Reset
Heating Reset Type

HRT1
HRT2
DGRH

No Heat Reset Temp
Full Heat Reset Temp
Degrees Heat Reset
DEMAND LIMIT
Demand Limit Select

DMDC

DM20
SHNM
SHDL
SHTM
DLS1
DLS2
LLEN
MSSL
SLVA
LLBL
LLBD
LLDY

STATUS
0 = No Reset
1 = 4-20 mA input
2 = External temp-OAT
3 = Return fluid
4 = External temp-SPT
0 to 125
0 to 125
–30 to 30
0 = No Reset
1 = 4-20 mA input
2 = External temp-OAT
3 = Return fluid
4 = External temp-SPT
Not Supported
Not Supported
–30 to 30

Demand Limit at 20mA
Loadshed Group Number
Loadshed Demand Delta
Maximum Loadshed Time
Demand Limit Switch 1
Demand Limit Switch 2
LEAD/LAG
Lead/Lag Chiller Enable
Master/Slave Select
Slave Address
Lead/Lag Balance Select
Lead/Lag Balance Delta
Lag Start Delay

CL-5

UNITS

°F
°F
^F

°F
°F
^F

0 = None
1 = External switch input
2 = 4-20 ma input
3 = Loadshed
0 to 100
0 to 99
0 to 60
0 to 120
0 to 100
0 to 100

%
min
%
%

Enable/Disable
Slave/Master
0 to 239
Enable/Disable
40 to 400
0 to 30

hours
min

0

%

VALUE

C. Unit Start-Up (cont)
PRESS ESCAPE KEY TO DISPLAY ‘RSET’. PRESS DOWN ARROW KEY TO DISPLAY ‘SLCT’.
PRESS ENTER KEY.
RECORD CONFIGURATION INFORMATION BELOW:
SLCT (Heating Cooling Setpoint Select)
ITEM
CLSP

DESCRIPTION
Cooling Setpoint Select

HTSP

Heating Setpoint Select

RL.S
CRMP
HRMP
HCSW
Z.GN

Ramp Load Select
Cooling Ramp Loading
Heating Ramp Loading
Heat Cool Select
Deadband Multiplier

STATUS
0 = Single
1 = Dual Switch
2 = Dual Clock
3 = 4 to 20 mA Input
4 = 4-20 mA Input
5 = External Setpoint Potentiometer
0 = Single
1 = Dual Switch
2 = Dual 7 day schedule
3 = Dual CCN occupancy
4 = 4-20 mA Input
5 = Setpoint Potentiometer
Enable/Disable
0.2 to 2.0
0.2 to 2.0
Cool/Heat
1.0 to 4.0

UNITS

VALUE

PRESS ESCAPE KEY SEVERAL TIMES TO GET TO THE MODE LEVEL (BLANK DISPLAY). USE THE
ARROW KEYS TO SCROLL TO THE SET POINT LED. PRESS ENTER TO DISPLAY SETPOINTS.
RECORD CONFIGURATION INFORMATION BELOW:
SETPOINT
SUB-MODE
COOL

HEAT
HEAD

ITEM
CSP.1
CSP.2
CSP.3
HSP.1
HSP.2
HD.P.A
HD.P.B

DESCRIPTION
Cooling Setpoint 1
Cooling Setpoint 2
Cooling Setpoint 3
Heating Setpoint 1
Heating Setpoint 2
Head Pressure Setpoint A
Head Pressure Setpoint B

STATUS
–20 to 70
–20 to 70
–20 to 32
80 to 140
80 to 140
80 to 140
80 to 140

UNITS
°F
°F
°F
°F
°F
°F
°F

VALUE

USE ARROW/ESCAPE KEYS TO ILLUMINATE TEMPERATURES LED. PRESS ENTER TO DISPLAY
‘UNIT’. PRESS ENTER AND USE THE ARROW KEYS TO RECORD TEMPERATURES FOR T1 AND
T2 BELOW. RECORD T9 AND T10 IF INSTALLED. RECORD CONDENSER ENTERING AND LEAVING
FLUID TEMPERATURES IF INSTALLED. PRESS ESCAPE TO DISPLAY ‘UNIT’ AGAIN AND PRESS
THE DOWN ARROW KEY TO DISPLAY ‘CIR.A’. PRESS ENTER AND USE THE ARROW KEYS
TO RECORD TEMPERATURE FOR T3 (30GTN,R ONLY). USING A DC VOLTMETER, MEASURE
AND RECORD THE VOLTAGE FOR EACH THERMISTOR AT THE LOCATION SHOWN. FOR MODELS
WITH QUICKSET, RECORD THE TEMPERATURES ACCORDING TO THE DC VOLTAGES USING
TABLES 32A-33B.
TEMPERATURE

VDC

BOARD LOCATION

T1 (CLWT)

MBB, J8 PINS 13,14

T2 (CEWT)

MBB, J8 PINS 11,12

T3 (SCT.A)

MBB, J8 PINS 21,22

T9 (OAT)

MBB, J8 PINS 7,8

T10 (SPT)

MBB, J8 PINS 5,6

(CNDE)

MBB, J8 PINS 1,2

(CNDL)

MBB, J8 PINS 3,4

CL-6

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C. Unit Start-Up (cont)
USE ESCAPE/ARROW KEYS TO ILLUMINATE CONFIGURATION LED. PRESS ENTER TO DISPLAY ‘DISP’.
PRESS ENTER AGAIN TO DISPLAY ‘TEST’ FOLLOWED BY ‘OFF’. PRESS ENTER TO STOP DISPLAY AT
‘OFF’ AND ENTER AGAIN SO ‘OFF’ DISPLAY FLASHES. ‘PASS’ AND ‘WORD’ WILL FLASH IF PASSWORD
NEEDS TO BE ENTERED. PRESS ENTER TO DISPLAY PASSWORD FIELD AND USE THE ENTER KEY FOR
EACH OF THE FOUR PASSWORD DIGITS. USE ARROW KEYS IF PASSWORD IS OTHER THAN STANDARD.
AT FLASHING ‘OFF’ DISPLAY, PRESS THE UP ARROW KEY TO DISPLAY ’ON’ AND PRESS ENTER. ALL LED
SEGMENTS AND MODE LEDS WILL LIGHT UP. PRESS ESCAPE TO STOP THE TEST. PRESS ESCAPE TO
RETURN TO THE ‘DISP’ DISPLAY. PRESS THE ESCAPE KEY AGAIN AND USE THE ARROW KEYS TO ILLUMINATE THE SERVICE TEST LED. PRESS ENTER TO DISPLAY ‘TEST’. PRESS ENTER TO STOP DISPLAY
AT ‘OFF’ AND ENTER AGAIN SO ‘OFF’ FLASHES. PRESS THE UP ARROW KEY AND ENTER TO ENABLE
THE MANUAL MODE. PRESS ESCAPE AND DISPLAY NOW SAYS ‘TEST’ ‘ON’.
PRESS THE DOWN ARROW TO DISPLAY ‘OUTS’. PRESS THE ENTER KEY TO DISPLAY ‘LLS.A’. PRESS
THE ENTER KEY TO STOP DISPLAY AT ‘OFF’ AND ENTER AGAIN SO ‘OFF’ FLASHES. PRESS THE UP
ARROW KEY AND ENTER TO TURN THE OUTPUT ON. PRESS ENTER SO THE ‘ON’ DISPLAY FLASHES,
PRESS THE DOWN ARROW KEY AND THEN ENTER TO TURN THE OUTPUT OFF. OUTPUTS WILL ALSO BE
TURNED OFF OR SENT TO 0% WHEN ANOTHER OUTPUT IS TURNED ON. CHECK OFF THE FOLLOWING
THAT APPLY AFTER BEING TESTED:
LLS.A

N/A

EXV.A

LLS.B

N/A

EXV.B

FAN1

FAN2

FAN3

FAN4

CLR.P

(TB5 — 10,12)

RMT.A

(TB5 — 11,12)

CND.P

N/A

USE ESCAPE KEY TO RETURN TO ‘OUTS’ DISPLAY. PRESS DOWN ARROW TO DISPLAY ‘COMP’. PRESS
ENTER KEY TO DISPLAY ‘CC.A1’. NOTE THAT UNLOADERS AND HOT GAS BYPASS SOLENOIDS CAN BE
TESTED BOTH WITH AND WITHOUT COMPRESSOR(S) RUNNING. MAKE SURE ALL SERVICE VALVES ARE
OPEN AND COOLER/CONDENSER PUMPS HAVE BEEN TURNED ON BEFORE STARTING COMPRESSORS. CHECK OFF EACH ITEM AFTER SUCCESSFUL TEST. THE CONTROL WILL ONLY START ONE COMPRESSOR PER MINUTE. WHEN AT THE DESIRED ITEM, PRESS THE ENTER KEY TWICE TO MAKE THE
‘OFF’ FLASH. PRESS THE UP ARROW KEY AND ENTER TO TURN THE OUTPUT ON.
CC.A1

CC.A2

CC.A3

CC.A4

UL.A1

UL.A2

HGBP
CC.B1

CC.B2

CC.B3

CC.B4

UL.B1

UL.B2

CHECK AND ADJUST SUPERHEAT AS REQUIRED.

CL-7

All Units:
MEASURE THE FOLLOWING (MEASURE WHILE MACHINE IS IN STABLE OPERATING CONDITION):
CIRCUIT A

CIRCUIT B

DISCHARGE PRESSURE
SUCTION PRESSURE
OIL PRESSURE
DISCHARGE LINE TEMP
SUCTION LINE TEMP
SATURATED COND TEMP (T3/T4)
SATURATED SUCT TEMP (T5/T6)
SUCTION GAS TEMP (T7/T8)
COOLER ENT FLUID (T2)
COOLER LVG FLUID (T1)

Copyright 2000 Carrier Corporation
Book
Tab

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
2
PC 903
Catalog No. 563-025
Printed in U.S.A.
Form 30GTN-3T
Pg CL-8
3-00
Replaces: 30GTN-2T
5c



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