CARRIER Package Units(both Units Combined) Manual L0606344

User Manual: CARRIER CARRIER Package Units(both units combined) Manual CARRIER Package Units(both units combined) Owner's Manual, CARRIER Package Units(both units combined) installation guides

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50HJ015,017
Single-Package Rooftop Units
Electric Cooling with Electric Heat Option

Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS ......................
1
INSTALLATION ................................
1-27
Step 1 -- Provide Unit Support ...................
1
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 -- Rig and Place Unit .....................
4
• POSITIONING
• ROOF MOUNT
Step 3 -- Field Fabricate Ductwork ...............
4
Step 4 -- Make Unit Duct Connections ...........
7
Step 5 -- Trap Condensate Drain .................
7
Step 6 -- Make Electrical Connections ...........
8
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
• OPTIONAL NON-FUSED DISCONNECT
• OPTIONAL CONVENIENCE OUTLET
Step 7 -- Make Outdoor-Air Inlet
Adjustments ....................................
10
• MANUAL OUTDOOR-AIR DAMPER
Step 8 -- Install Outdoor-Air Hood ..............
10
Step 9 -- Install All Accessories .................
11
• MOTORMASTER® I CONTROL INSTALLATION
Step 10 -- Adjust Factory-Installed Options ..... 12
• PREMIERLINK TM CONTROL
• ENTHALPY SWITCH/RECEIVER
• OUTDOOR ENTHALPY CONTROL
• DIFFERENTIAL ENTHALPY CONTROL
• ENTHALPY SENSORS AND CONTROL
• OPTIONAL ECONOMISERIV AND ECONOMISER2
• ECONOMISERIV STANDARD SENSORS
• ECONOMISERIV CONTROL MODES
Step 11 -- Install Humidistat for
Optional MoistureMi$er TM Package ............
25
START-UP .......................................
28-34
Unit Preparation .................................
28
Operating Sequence ............................
33
SERVICE ........................................
35-40
TROUBLESHOOTING ...........................
41-44
INDEX ..............................................
45
START-UP CHECKLIST .........................
CL-1
SAFETY

CONSIDERATIONS

Installation and selwicing of air-conditioning equipment can
be hazardous due to system pressure and electric_d components. Only trained and qualified service personnel should install, repaiL or service ai>conditioning equipment.
Untrained personnel can perform basic maintenance functions of cleaning coils and filters and replacing filters. All other

Manufacturer

operations should be performed by trained service personnel.
When working
on air-conditioning
equipment,
observe
precautions in the literature, tags and labels attached to the unit,
and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for _dl brazing operations.

Before performing service or maintenance
operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.

ating limits. If limits are exceeded, the unit will automatically lock the compressor out of operation. Manual reset
IMPORTANT:
havethe
high
mnbient temperature oper- ]
will be required Units
to restart
compressor:
INSTALLATION
Inspect unit for transportation &unage. If damage is found,
file claim with transportation agency.
Step 1 -- Provide Unit Support
ROOF CURB -- Asselnble and install accessory roof curb or
horizontal supply roof curb in accordance with instructions
shipped with the accesso q. Accesso U roof curb and horizontal
supply roof curb and information required to field fabricate a
roof curb or horizont_d supply roof curb gueshown in Fig. 1 and
2. Install insulation, cant strips, roofing, and counter flashing as
shown. Ductwork can be secured to roof curb before unit is set
in place.
IMPORTANT: The gasketing of the unit to the roof curb or
horizontal supply roof curb is critical for a leakproof se_d.
Install gasket supplied with the roof curb or horizont_d supply roof curb as shown in Fig, 1. hnproperly applied gasket
can result in air leaks and poor unit performance.

Roof curb must be level. This is necessary to permit unit
drain to function properly. Unit leveling tolerance is + ]/]_ in.
per linear ft in any direction. Refer to Accessory Roof Curb or
Horizontal Supply Roof Curb Installation Instructions for additional information as required.
ALTERNATE UNIT SUPPORT -- When the curb or a&tpter
cannot be used, support unit with sleepel_ using unit curb or
adapter support area. [f sleepers cannot be used, support long
sides of unit with a minimum of 3 equally spaced 4-in. x 4-in.
pads on each side.

reserves the right to discontinue, or change at any time, specifications
Catalog No. 04-53500012-01

Printed in U.S.A.

or designs

Form 50HJ-29SI

without notice and without incurring obligations.
Pg 1

3-06

Replaces:

50HJ-25SI

NOTES:
1. Roof curb accessory is shipped disassembled.
2. Insulated panels: 1" thick neoprene coated 11/2 Ib density.
3. Dimensions in ( ) are in millimeters.

CURB

PKG.
NO. REF.

HEIGHT

DESCRIPTION

CRRFCURBO10A00

1"-2" (305)

CRRFCURB011A00

2"-0" (610)

CRRFCURB012A00

2'-0" (610)

Standard Curb 14" High
Standard Curb for Units
Requiring High Installation
Side Supply and Return
Curb for H gh neta aton

4. E_

/PLAN

(/rD!)

VIEW

ROOF CURB

jOUTL[NE

SUPPLY

B//B

OF UNIT

RETURN
OPENING
CURB

BC1.
CO'_P_
B"

Direction of airflow.

5. Roof curb: 16 ga. (VA03-56) stl.
6. A 90 degree elbow must be installed on the supply ductwork
below the unit discharge for units equipped
with electric heaters.
7. To prevent the hazard of stagnant water build-up in the drain pan of the
indoor section, unit can only be pitched as shown.

UPPLY" rS'Nd

i CONS
S'R i

I"'l
B'
A
t

co PRE
EN

!
POWER
(GAS ARA
_NTRYCL FOR
dEEP TH]5
AR GAB
FOR :RED

J:_

C5ND NSA
RA[N_
ROOF 0#'5)

(s2>
ATTACH

DUCT

........

CONOENB R
COH_._5_R
AN

DIMENSIONS*

(degrees and inches)

TO ROOF CURB

UNIT
(349)

1"-7

13/i8
(BOA)

Deg. A

L
"_

ALL

.28

in.

Deg. B

.45

.28

in.
.43

UNI1 LEVELING OLERANCES

MITERED(T5PCORNERS_
ONLY)

• Fr-ora

edge

ho_

zo:,toL,

_0"
1 1/4"
(32)
(SUPPLIED

GA5KET
WITH CURB)
_COUNTER
(FIELD

TYP,

FLASHING
SUPPLIED)

4 PLC5
FIELD

0'i

5UPPL[EB

CANT
_ilELD
/

0"_6

\\
\

B"
5'

7 //1

_-"

2 !14"

/(BBB)

{170B_

-/"

1"
(CR

C RBO!2AOO

457

.
LO'

ONLY)

.2/: / /2

{B_)

(CRRFC

RB0/2AO0

Fig. 1 -- Roof Curb Details

RIGID
(FIELD

INBULATION
SUPPLIED)

STRIP
SUPPLIED)
_ROOFING
(FIELD

MATERIAL
SUPPLIED)

25% VENT AIR//
ECONOMIZER
HOOD
_.

I
i
I
E

AIR

OUT

f//

\
TRANSITION DUCT

HORIZONTAL SUPPLY _
CURB (CRRFCURB013A00)

/_
/
/

2"X 1/4
SUPPORT TYR

f_
/

STITCH WELDED/STICK

FULLY INSULATED
SUPPLY PLENUM
1" INSULATION
1 1/2 # DENSITY,
PINNED & GLUED

T
14 3/4"

_-_
_-_-___
NOTE: CRRFCURB013A00
is a fully factory preassembled horizontal adapter and includes an insulated transition duct. The pressure
drop through the adapter curb is negligible.
For horizontal return applications: The power exhaust and barometric relief dampers must be installed in the return air duct.

"P'21_3

SEAM PANELS

ACCESSORY
PACKAGE NO.
CRRFCURB013A00

Fig. 2 -- Horizontal Supply/Return

12,,W

CURB
HEIGHT
1'-1 1"
(584

Adapter Installation

DESCRIPTION
Pre-Assembled, Horizontal
Adapter Roof Curb

Step 2 --

Rig and Place Unit -- Keep unit upright,
and do not &op. Use spreader bal_ over unit to prevent sling or
cable &image. Rollers may be used to move unit across a roof.
Level by using unit frame as a reference; leveling tolerance is
_+1/16in. per line;u" fl in any direction. See Fig. 3 for additional
information. Unit weight is shown in Table 1.
Four liming holes ale provided in ends of unit base r;fils as
shown in Fig. 3. Refer to rigging instructions on unit.
POSITIONING
-- Provide clearance around and above unit
for airflow, safety, and service access (Fig. 4).
Do not install unit in an indoor location. Do not locate ;dr
inlets near exhaust vents or other sources of contaminated ail_
Although unit is weatherproof,
higher level runoff and overhangs.

guard against

10'-0"
(3048)

"DETAIL A"
RIGGING
HOOK
(t 105)
3'-71/2"
UNITBASERAIL
SEE
"DETAIL

water fiom

ROOF MOUNT -- Check building codes for weight distribution requirements.

Step 3 --

Field Fabricate Ductwork -- Secure _dl
ducts to building structure. Use flexible duct connectors between unit and ducts as required. Insulate and weatherproof all
external ductwork, joints, and roof openings with counter
flashing and mastic in accordance with applicable codes.
Ducts passing through an unconditioned space must be insulated and covered with a vapor barriel:
The 50HJ units with electric heat require a l-in. clearance
for the that 24 in. of ductwork.
Outlet grilles must not lie directly below unit discharge.
NOTE: A 90-degree elbow must be provided in the ductwoN
to comply with UL (Underwritel_ Laboratories) codes for use
with electric heat.

UNIT
50HJ
015
017

MAXIMUM
SHIPPING WEIGHT

DIMENSIONS
A

]

ft-in.

] mm

ft-in,

1625
1700

737
771

6-11V2
6-11V2

I 2121

4-0
3-10

1219
1168

NOTES:
1. Dimensions in ( ) are in millimeters.
2. Refer to Table 1 for unit operating weights,
3. Remove boards at ends of unit and runners prior to rigging.
4. Rig by inserting hooks into unit base rails as shown, Use corner
post from packaging to protect coil from damage. Use bumper
boards for spreader bars,
5. Weights do not include optional economizer. Add 90 Ib (41 kg)
for economizer weight.
6. Weights given are for aluminum evaporator and condenser coil
plate fins, Weights include electric heat.
7. Add 75 Ib (34 kg) for crating on 50HJ015 and 017 units,
8. Add 150 Ib (68 kg) for copper condenser coil, Add 280 Ib
(127 kg) for copper condenser and evaporator coils.

All panels must be in place when rigging.
For vertical supply and return units, tools or parts could
drop into ductwork and cause an injury. Install a 90-degree
turn in the return ductwork between the unit and the conditioned space. If a 90-degree elbow cannot be installed, then
a grille of sufficient strength and density should be inst_dled
to prevent objects from falling into the conditioned space.
Due to electric heatel: supply duct will requile 90-degree
elbow.

Fig. 3 --

Rigging

Details

STD UNIT
WEIGHT

UNIT

50HJ015
50HJ017
1 3/8"
TYP

(4)

P,LC5

_CORNE8

DRAIN

I Kg

1575
1650

714
748

90
90

DIM A
CO.#ER
CO%NER
CO.oN.
CO%NER

•bIKgI,b I KgI,b I*gI,b I*g ft-in.

6"-11
_1"=7

4o7165137511701383117414101186
3-5
1039 3-5

41
41

375

170

375

1/2"

13115"

(2121)
1"-4

5/15

1'=4

9115"

_CORNER

_0"=3
(108)

15/16"

(33)5

0"-5
(151)

15/15"

SUPP[

SECTION

i
i
i

• 50

RETURN

i
i
i
i
i
i
i
i
i
i
i
i
i
i
i
i
i
i
i
i
i
i
i

0._ 03/18-

_\_/,

HOLE

DIA

['-12'00

7/E

(1825)
TYPICAL__I
_;

2 31
DIA

1 1/4"
7"-2

1/8"

[CAL

(2187)
TYPICAL

4 CORNERS

EXHAU5T
(ACCESSORY
ONLY)

---

5"-11

AIR

L _

z0._731 -,2
,

I I_S-.

(157)

0"-2"(51)
_.A

K._,

1,_

(s..NRU
CUR_
O*S
CONN.)/ °0) _

COR_ER
C
13,_-DIA
CONCENTRIC
_,o._/
(35)

204

452

205

3-2

O'-

L__Z#S ..... _

22)

(THRU

CURB,24V)

o.-3i,8,

_ .
50_; is,18
_OORRER
B(_B)

g 718

r-(7B)

g
5"-11
(1813)

963

1054
1092

3-7

I ft-in. I mm
I1-1o 1559
1-10

559

(THRU CURB POWER)
ACCE55
FAR

Center of Gravity.

SIDE

.)
//

Direction of airflow.

DIA

25_; AIR

"-10 5118"
(567)

ECONOMIZER

CONCENTRIC

K.O.

ROWER)
OPENING

(?B?)
PER OPEN[NG

OR
HOOD

/---1

?
/

roof curb only.

• Rear: 7"-0" (2134) for coil removal. This dimension can be reduced to
4'-0" (1219) if conditions permit coil removal from the top.
• Left side: 4"-0" (1219) for proper condenser coil airflow.
• Front: 4'-0" (1219) for control box access.
• Right side: 4"-0" (1219) for proper operation of damper and power
exhaust if so equipped•
• Top: 6'@" (1829) to assure proper condenser fan operation•
• Local codes or jurisdiction may prevail•
7. With the exception of clearance for the condenser coil and the
damper/power exhaust as stated in Note #6, a removable fence or
barricade requires no clearance.
8. Dimensions are from outside of corner post. Allow O'-S/m" (8) on each
side for top cover drip edge.
9. A 90-degree elbow must be installed on the supply ductwork
below the unit discharge for units equipped with electric heaters.

(22)
(FIELD
3/8"
ECONOMIZER

BOX
FILTERS
ACCESS

5. Ductwork to be attached to accessory
6. Minimum clearance:

(788)

OUTDOOR

5"-7
3/16"
(1707)

(76)

449

4. E_

I
i
i
i
i
i
i

170

DIM C

NOTES:
1. Refer to print for roof curb accessory dimensions.
2. Dimensions in ( ) are in millimeters.

A
"

(_L_L L:-

HOLE

[

DIM B
ft-in.

I mm

o-&p _1!
0"-8
I/B
(206)

DIA.

ECONOMIZER
WEIGHT

[

///

'_LJ0:oSL'S:)'°:::F--

3"-9"
(1143)

VIEW Z=Z
BAROMETRIC
RELIEF/POWEREXHAUST
(ACCESSORY
ONLY)
1"-6

50HJ017

ONLY

3/8"

A_
CO]L

(51)
-314"
(27)

FPT DRAIN
FAR SIDE

(92)

7/8
DIA
(22)
CONNECTION
ONLY

1"-3/18"_"
(310)

(35)

(FIELD

POWER)

* "

_3 5,B',
13,8-o. CO.OENTRIO
_0 t
_1;_
K,O.

(CONTROL)

_1(31_4"

D A

0 "qf3"
0"-4"
LE

5"-6"
(1576)

Fig. 4 -- Base Unit Dimensions, 50HJ015, 017

(7B)

HO
1(102)

SECTION

A-A

Table1 --

Physical Data

UNIT 50HJ

015

UNIT VOLTAGE
NOMINAL

208/230 1460

CAPACITY

(tons)

OPERATING WEIGHT (Ib)
Unit
AI/AI*
AI/Cu*
Cu/Cu*
Economizer
Roof Curbt
MoistureMi$er TM Dehumidification
COMPRESSOR
Quantity,.,Model
(Ckt 1, Ckt 2)
Number of Refrigerant Circuits
Crankcase Heater Watts
Loading (% of Full Capacity)
Oil (oz) (Ckt t, Ckt 2)
REFRIGERANT TYPE
Expansion Device
Operating Charge (Ib)**
Circuit 1
Circuit 2
CONDENSER

Package

Cross-Hatched

COIL

-----

19.5
13.45
or

V2-.1050
3_.22
1100

3/8-in. Copper Tubes, Aluminum
Split

1725
3.13
4.26

Bhp
Bhp

56H
Low-Medium Static
High Static

895-1147
1040-1315

Low-Medium Static
High Static

3.1/4.1
3.7/4.7
7&
6.0
6.0
13/16
1-.BX.-45
1-.BX.-45
14.5-16.0
45
45

Ball
1,550

Low=Medium Static
High Static

(in.)
(in.)

Lanced or Copper Plate Fins, Face

17.5
4...15

Low-Medium Static
High Static
Low-Medium Static
High Static

Low=Medium Static
High Static

I
I
I

2._12 x 12
Belt
6000
5

3.0
N/A

1745
6.13
N/A
184T
873-1021
1025-1200
Ball
1,550
4,9/5.9
4,9/5.9
1 V8
9.4
8.0

3.38
N/A
895-1147
N/A

3.1/4.1
N/A
7/8

6.0
6.0
13/16
1 .-BX-.45
1 .-BX-.45
14.5-16.0
45
N/A

3.5
987
1155

3.5
1177
N/A

17/16

1 .-BX...50
1 .-BX...48
13.3-14.8
37
44
4it
3.5
965
1134

(psig)

SWITCH

(psig)
27
44

THERMOSTAT

INLET SCREENS

Cleanable

(in,)

2...20
x 25 x 1
1._20x20x
1

FILTERS

Throwaway

(in,)

Aluminum
Brake Horsepower
Copper
Thermostatic Expansion

(F)
30 _+5
45 _+5

4...20
x 20 x 2
4._16x20x2

LEGEND
AI
Bhp
Cu
TXV

426
320

FREEZE PROTECTION
Opens
Closes

Quantity,.,Size

1-.ZR72KC
2
70
O, 60, 100
85, 60

a/s-in. Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated,
Copper Plate Fins
4...15
I
4_.15
21.7
I
21.7
Propeller Type
10,500
I
10,500

2.9
3.7

Pulley Center Line Distance (in,)
Speed Change per Full Turn of Movable
Pulley Flange (Rpm)
Movable Pulley Maximum Full Turns
From Closed Position
Factory Speed
Factory Speed Setting (Rpm)

RETURN-AIR

1-.ZR94KC,

2.-12 x 12
Belt
5200

Nominal Fan Shaft Diameter
Belt, Quantity,..Type...Length

Quantity..,Size

1650
1800
1930
90
200
40

Centrifugal Type

Nominal Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.)

OUTDOOR-AIR

1575
1725
1855
90
200
40

17.5
4...15

Motor Bearing Type
Maximum Allowable Rpm
Motor Pulley Pitch Dia.

LOW-PRESSURE
Cutout
Reset (Auto.)

1/2._1050
3...22
1100

(in,)

SWITCH

146o1575

20.7
13.4
Cross-Hatched

Rows,..Finslin,
Total Face Area (sq ft)
EVAPORATOR FAN
Quantity,.,Size
(in,)
Type Drive
Nominal Cfm
Std Motor Hp
Opt Motor Hp
Motor Nominal Rpm
Std Maximum Continuous
Opt Maximum Continuous
Motor Frame Size
Fan Rpm Range

HIGH-PRESSURE
Cutout
Reset (Auto.)

208/230

R-22
TXV

Rows,..Fins/in,
Total Face Area (sq ft)
CONDENSER FAN
Nominal Cfm

EVAPORATOR

575

2-.ZR72KC
2
70
0,53, 100
60, 60

COIL

Motor Hp..,Rpm
Quantity,.,Diameter
Watts
Input (Total)

017

Valve

*Evaporator coil fin material/condenser
coil fin material.
tWeight of 14-in. roof curb.
**Circuit 1 uses the lower portion of condenser coil and lower portion of evaporator coils, and Circuit 2 uses the upper portion of both coils.
ttDue to belt and pulley style, pulley cannot be set from 0 to 11/2 turns open.

Step 4 --

Make Unit Duct Connections

-- Unit is

shipped for thru-the-bottom duct connections. Ductwork openings are shown in Fig. 5. Field-fabricated concentric ductwork
may be connected as shown in Fig. 6 and 7. Attach all
ductwork to roof curb and roof curb basepans. Refer to installation instructions shipped with accessory roof curb for more
information.

Step 5--

Trap Condensate
Drain -- See Fig. 4
and 8 for drain location. Plug is provided in &'ain hole and
must be removed when unit is opelating. One 3/4-in. halfcoupling is provided inside unit evaporator section for condensate drain connection. An 81/2 in. x :V4-in. diameter nipple and a
2-in. x 3/4-in. diameter pipe nipple are coupled to stan&trd
3/4-in. dimneter elbows to provide a straight path down through
holes in unit base rails (see Fig. 9). A trap at least 4-in. deep
must be used.

/
/

BAFFLE

Shaded area indicates block-off panels.
NOTE: Dimensions
ceiling diffuser.

A, A' and B, B' are obtained from field-supplied

/EVAPORATORFAN MOTOR

Concentric ducts may only be installed on units without electric
heat. Personal injury or unit damage may result.

Fig. 7 -- Concentric Duct Details

1#cb

A,R

INDOOR

FAN MOTOR ACCESS

_/OUT

NOTE: Do not drill in this area, as damage to basepan may result
in water leak.

Fig. 5 -- Air Distribution -- Thru-the-Bottom
(50HJ017 Shown)

EVAPORATORFAN MOTOR

FILTER
ACCESS
SEE
NOTE

3/4" FPT DRAIN
CONNECTION

1-3/8"
DRAIN HOLE

Fig. 8 -- Condensate
Drain Details
(50HJ015
Shown)
AIR OUT

AIR IN

AIR OUT

NOTE: Do not drill in this area, as damage to basepan may result in
water leak.

Fig. 6 -- Concentric Duct Air Distribution
(50HJ017 Shown)

(HALF CO_

use no. 16 AWG insulated wire (35 C minimum). For over
75 It, use no. 14 AWG insulated wire (35 C minimum). All
wire larger than no. 18 AWG cannot be directly connected to
the thermostat and will require a junction box and splice at the
thermostat.

8 I12-IN. (FIELD-

_"']

Set heat anticipator settings as indicated in Table 4. Settings
may be changed slightly to provide a greater degree of comfort
for a particuku inst_dlation.
Refer to accessory remote control instructions as lequired.
------'I

SUPPLIED)

Make Electrical

Fig. 9 -- Condensate Drain Piping Details
Step 6 --

TBI

NIPPLE

.....

FIELD POWER SUPPLY -- Unit is factory wired for voltage shown on nameplate.

f---I

POWER

F'LM

EQUIP GNO

I
L....................

TB1 MAXIMUM

Route power lines through conhol box access panel or unit
basepan (Fig. 4) to connections as shown on unit wiling diagram and Fig. 10.
Operating voltage to compressor must be within voltage
range indicated on unit nmneplate. On 3-phase units, voltages
between phases must be balanced within 2% and the cunent
must be b_danced within 10%.

.......

Connections

When installing units, provide a disconnect, per NEC
(National Electrical Code) requirements, of adequate size
(Table 2). Electric_d heater data is shown in Table 3.
All field wiring must comply with NEC and local requirements.

FIELD

WIRE SIZE
VOLTAGE

UNIT
50HJ

208/230

All

2/0

350 kcmil

2/0

LEGEND
EQUIP-GND -kcmil -NEC -TB
--

Equipment
Ground
Thousand Circular Mils
National Electrical Code
Terminal Block

Fig. 10-

Field Power Wiring Connections

The correct power phasing is critical in the operation of the
scroll compressors.
An inconect phasing will cause the
compressor to rotate in the wrong direction. This may lead
to premature compressor failure.
THERMOSTAT

Unit failure as a result of operation on improper line voltage
or excessive phase imbalance constitutes abuse and may cause
dmnage to electrical components.
FIELD CONTROL WIRING -- Install a CguTier-approved
accessory fllermostat assembly according to the installation instructions included wifll the accessory. Locate thermostat assembly on a solid wall in the conditioned space to sense average temperature.
Route thermostat cable or equiv_dent single leads of colored
wire fi_)m subbase terminals through conduit in unit to lowvoltage connections as shown on unit label wiring diagram and
in Fig. 11.
NOTE: For wire runs up to 50 It, use no. 18 AWG (American
Wire Gage) insulated wire (35 C minimum). For 50 to 75 It,

R E_J

U M_]R

ASSEMBLY

mm
C3
LU

_
Z

Z
CC

3_,

Z
_

UNIT LOW-VOLTAGE CONNECTIONS

Fig. 11 -- Field Control Thermostat

Wiring

I--

Table 2 -- Electrical Data
NOMINAL
VOLTAGE

UNIT
50HJ

(3 Ph, 60 Hz)

208/230

VOLTAGE
RANGE
Min

187

Max

253

COMPRESSOR
No. 1
No, 2
RLA

20.7

LRA

156

RLA

20.7

LRA

156

OFM
Qty

0.5

IFM

FLA (ea)

1.7

2.9

POWER
EXHAUST

FLA

8.8/
8.4

015
(Standard
IFM)
460

575

208/230

414

518

187

506

633

253

8.2

20.7

156

8.2

20.7

156

0.8

0.5

0.8

2.9

0.75

3.0

1.7

3.7

4.2

3.9

10.5/
11.0

015
(Optional
IFM)

460

208/230

414

187

506

253

32.1

195

20.7

156

0.5

0.8

3.7

1.7

5.0

4.8

15.8/

575

414

518

508

633

16.4

8.2

0.5

LEGEND
FLA
HACR

---

IFM
LRA
MCA
MOCP
NEC
OPM
RLA

--------

Full Load Amps
Heating, Air Conditioning and
Refrigeration
Indoor (Evaporator) Fan Motor
Locked Rotor Amps
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code
Outdoor (Condenser) Fan Motor
Rated Load Amps

5.0

0.75

5.0

18.8

kW
--14/19
14/19
26/34
26/34
42/56"*
42/56"*

FLA
--39/45
39/48
71/82
71/82
117/135
117/135

4.6

18.8

4.6

18.8

4.6

18.8

4.6
2.3

6.0

---

29
31

35
40

2.3

6.0

15
15

18
18

29
31

35
40

2.3

6.0

32
32

39
39

54
57

60
60

2,3

6,0

55**
55**

66
66

71
74

80
80

2.1

4.8

---

25
27

30
30

2.1

4.8

37**
37**

37
37

51
54

4.6

18.8

4.6

18.8

4.6

18.8

4.6

18.8

--14/19
14/19
26/34
26/34
42/56"*
42/56"*

--39/45
39/45
71/82
71/82
117/135
117/135

2.3

6.0

2.3

6.0

2.3

6.0

2.3

6.0

-15
15
32
32
55**
55**

4.6

18.8

---

82/82
86/86

110/110
110/110

26/34

71/82

109/122

110/125

4.6

18.8

26/34

71/82

114/128

125/150

4.6

18.8

42/56
42/56

117/135
117/135

166/155
172/161

175/175
175/175

4.6

18.8

56/75"*
56/75"*

156/180
156/180

176/200
182/206

200/225
200/225

2.3

6.0

---

41
43

50
50

2.3

6.0

32
32

39
39

59
62

60
70

2.3

6.0

55
55

66
66

76
79

90
90

2.3

6.0

80**
80**

96
96

106
109

128
125

2.1

4.8

---

31
34

40
40

7.9

6.0

MCA
60/60
65/65
60/67
66/73
100/113
106/119
157/146
163/151

62/63
67/67
62/70
68/76
102/116
108/122
189/149
165/155

MOCPt
80/80
80/80
70/70
80/80
100/125
110/125
175/175
175/175

60
60
80/80
80/80
80/80
80/80
110/125
110/125
178/175
175/175

---

30
32

35
40

18
18

30
32

35
40

39
39

55
58

60
60

66
66

72
75

80
80

EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
A a c
BC = 464 v

c t u,

max voltage deviation from average voltage
average voltage

Average
=
AC
= 455 Voltage
v

_ISTE_

*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v, and
575 v. Heaters are rated at 240 v, 480 v, or 875 v. If power distribution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.
l-Fuse or HACR circuit breaker.
**Heaters are field installed only.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NEC Articles 430 and 440), the overcurrent protective
device for the unit shall be fuse or HACR breaker. Canadian units may be
fuse or circuit breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is
o
greater than 2_.
Use the following formula to determine the percent of voltage imbalance,
% Voltage Imbalance
= 100 x

0.8

LRA

15.8

017

460

FLA

POWER
SUPPLY

ELECTRIC
HEAT*

=--

452 + 464 + 455
3
1371
3

= 457
Determine maximum deviation from average voltage.
(AB) 457 - 452 = 5 v
(BC) 464 -487 = 7 v
(AC) 457 - 455 = 2 v
Maximum deviation is 7 v.
Determine

percent of voltage imbalance.
7
% Voltage Imbalance = 100x
= 1.53%
This amount of phase imbalance
allowable 2%.

is satisfactory

as it is below the maximum

2%,
IMPORTANT:
contact your
If the
localsupply
electricvoltage
utility company
phase imbalance
immediately.
is more than

J
]

3. MCA calculation for units with electric heaters over 80 kW = (1.25 x IFM
amps) + (1.00 x heater FLA).

Table 3 -- Electric Resistance Heater Data
MINIMUM

HEATER kW
Unit Voltages

UNIT
50HJ

015

017

HEATER
STAGES

208

230

240

460

480

575

% PER
HEAT

600

MAXIMUM
STAGES*

STAGE

17.9

78.9

82.3

37.3

39.0

129.4

135.0

63.3

66.1

78.8

82.3

37.3

39.0

117.0

129.4

135.0

63.3

66.1

155.9

172.4

179.9

92.0

96.0

71.3

33/67

117.0

50/50

71.3

33/67

50/50

kit or head pressure

kW*

208/230-3-60

.40
.40
.66
.66

.66
.40
.66

480-3-60

15
32
55
80

.40
.40
.40
.66

.40
.66
.66

575-3-60

.66

kW is based on heater voltage

STAGE

STAGE 2

4T2

and low-ambient

kit.

Make Outdoor-Air

Inlet Adjustments

Install Outdoor-Air

Hood

IMPORTANT:
If the unit is equipped with the optiomd
EconoMiSerIV
component, move the outdoor-air temperature sensor prior to installing the outdoor-air hood. See the
Optional EconoMiSerIV
and Economi$er2
section for
more information.
The same type of factory-installed
hood is used on units
with 25% air ventilation and units with an EconoMiSel:

2T1 LOAD

NOTE: The hood top panel, upper and lower filter retainers,
hood diain pan, baffle (size 017 units), and filter support
bracket tu'e secured opposite the condenser end of the unit. The

BLU.

25% ADJUSTABLE
AIR DAMPER

INoN
FUSED
0'sODNNEOT
__L LIN
J
SUPPLY

38.6

The handle must be in the OFF position to open the control box door.

Step 8 --

POWER

37.0

MANUAL OUTDOOR-AIR
DAMPER -- All units (except
those equipped with a factory-installed
economizer)
have a
manual outdoor-tdr damper to provide ventilation all: Damper
can be preset to adinit up to 25% outdoor tdr into return-air
compartment.
To adjust, loosen securing screws and move
damper to desired setting. Then retighten screws to secure
damper (Fig. 13).

FIELD

600

Tighten the Allen bolt to lock the shaft into position.
Close the control box dool:
Attach the handle to the external access door with the two
screws provided. When the handle is in the ON position,
the handle will be vertical. When the handle is in the OFF
position, the handle will be horizontal.
Turn the handle to the OFF position and close the dool:
The handle should fit over the end of the shaft when the
door is closed.

Step 7 --

Insert the disconnect shaft into the sqmue hole on the disconnect switch. The end of the shaft is specially cut and
the shaft can only be inserted in the correct orientation.
6T3

1770

575

OPTIONAL
CONVENIENCE
OUTLET-On units with
optional convenience outlet, a l15-v GFI (ground fault interrupt) convenience outlet receptacle is provided for field wiring.
Field wiring should be run through the 7/_-in. knockout provided in the basepan near the return air opening.

1. Open the control box door and remove the handle and
shaft from shipping location.
2. Ix_osen the Allen bolt located on the disconnect switch.
The bolt is located on the square hole and is used to hold
the shaft in place. The shaft cannot be inserted until the
Allen bolt is moved.

control device

To prevent breakage during shipping, the disconnect handle
and shaft ale shipped and packaged inside the unit control box.
Install the disconnect handle before unit operation. To install
the handle and shaft, perform the following procedure:

YEL.

1770

3750

of 208 v, 240 v, 480 v, and 575 v.

UNIT WIRING

3750

4.
5.
6.

OPTIONAL NON-FUSED
DISCONNECT
-- On units with
the option_fl non-fused disconnect, incoming power will be
wired into the disconnect switch. Refer to Fig. 12 for wiring
for 100 and 200 amp disconnect
switches. Units with an
MOCP (maximum overcurrent protection) under 100 will use
the 100 amp disconnect switch. Units with an MOCP over 100
will use the 200 amp disconnect switch. Refer to the applicable
disconnect wiring diagrmn.

480

17.2

50/50

14/19
26/34
42/56
56/75

BLK.

460

45.3

UNIT
VOLTAGES

100
AMP

240

43.4

015, 017

230

39.3

AMPS

208

100

Table 4 -- Heat Anticipator Settings

*Heater

HEATER

*Maximum number of stages using accessory low-ambient
NOTE: Heaters are rated at 240,480,
and 575 v.

UNIT
50HJ

Heating Cfm
Cfm
L/s

5L3

3L2

1L1

LINE

UNIT WIRING
BLK.

200
AMP

YEL.

BLU.

BASE
UNIT

,
I NON

FUSED

DISCONNECT

LINE

FIELD

POWER

÷I

SUPPLY

NOTE: The disconnect takes the place of TB-1 as shown on the unit wiring diagram label and the component
arrangement
label.

SECURING

Fig. 12 -- Optional

Non-Fused Disconnect Wiring

SCREWS

Fig. 13 -- 25% Outdoor-Air
10

Section

Details

screens, hood side panels, remaining section of filter support
bracket, seal strip, and all other hardware me in a package
located inside the return-air filter access panel (Fig. 14).
1+ Attach seal strip to upper filter retainel: See Fig. 15.
2. Assemble hood top panel and side panels, upper filter retainer, and hood diain pan (Fig. 16)+
3. Secure lower filter retainer and long section of filter support bracket to unit. See Fig+ 16. Leave screws loose on
size 017 units.
4. Slide baffle (size 017 units) behind lower filter retainer
and tighten screws.
5. Loosen sheet metal screws for base unit top panel located
above outdoor-air inlet opening, and remove screws for
hood side panels located on the sides of the outdoor-air
inlet opening.
6. Match notches in hood top panel to unit top panel screws.
Insert hood flange between unit top panel flange and unit.
Tighten screws.
7+ Hold hood side panel flanges flat against unit, and install
screws removed in Step 5+
8+ Insert outdoor-air inlet screens and spacer in channel created by lower filter retainer and filter support bracket.
9+ Attach remaining short section of filter support bracket+

details. Use 20-gage,
galvanized
sheet metal, or similm
corrosion-resistant
metal for baffles. Use field-supplied screws
to attach baffles to unit. Screws should be I/4-in. diameter and
5/8-in. long. Drill required screw holes for mounting baffles.
BAFFLE

(017 ONLY)

LOWER FILTER
RETAINER

FILTER SUPPORT
BRACKET

\
HOOD

SIDE

PANELS

HOOD TOP
PANEL

(2)

BAFFLE
• (017 ONLY)

OUTDOOR-AIR
HOOD AND
MOUNTING
BRACKETS

LOWER
FI_ER
RETAINER

BRACKET

HOOD

DRAIN

PAN

UPPER FILTER RETAINER
NOTE: The outdoor-air hood comes with a baffle which is used on 017 units
only; discard baffle for 015 units.

Fig. 16-

FILTER
PACKAGE
AN[
HOOD
COMPONENfS

Outdoor-Air

Hood

Details

RETURN-AIR
FtLTE}
ACCESS
PANEL

Fig.

14-

Outdoor-Air

Hood

TOP

UPPER

Component

PANEL

FILTER.

RETAINER

Location

HOOD

DRAIN

) MIN

BAFFLETOP VIEW 1" (25) MIN--_

PAN

to%---4

80-

Fig. 15 -- Seal Strip Location
(Air Hood Cross-Sectional
View)

/" ffYp)

10" (254)

40"

(to16)
,..,10"

Step 9 --

Install All Accessories

-- After

all the

(TYP)
"'-_1_+ 5"(381)

+
+J

factory-installed
options have been adjusted, install all fieldinstalled accessories. Refer to the accessory installation instructions included with each accessory.
MOTORMASTER®
I CONTROL
INSTALLATION

\,+j÷__

3/4" 09)(_P)-+J
BAFFLEFRONTVIEW

Install Field-Fabricated
Wind Baffles -- Wind baffles must
be field-fabricated
for all units to ensure proper cooling cycle
operation at low mnbient temperatures. See Fig+ 17 for baffle

NOTE: Dimensions

in (

) are in mm.

Fig. 1711

(254)

Wind

Baffle

Details

(TYP)
(25) MIN

Step 10To avoid dmnage to tile refiigerant coils and electrical components, use recommended screw sizes only. Use cme
when &illing holes.
Install Motormaster
[ Controls -- Only one Motormaster
I
control is required per unit. The Motormaster [ control must be
used in conjunction with the accessory 0 ° F low mnbient kit
(purchased separately). The Motormaster I device controls outdoor fan no. 1 while outdoor fans no. 2 and 3 are sequenced off
by the accessory 0 ° F low ambient kit.
A_zessorv 0 ° F Low Ambient Kit -- Install the accessory
low ambient kit per instruction supplied with accessory.
Sensor Assembly -- Install the sensor assembly
shown in Fig. 18.

Adjust

Factory-Installed

Options

PREMIERLIN
K TM CONTROL
-- The PrelnierLink controllet is available as a special order from the factory and is compatible with the Cmrier Comfort Network® (CCN) system.
This control is designed to allow use_ the access and ability to
change factory-defined settings, thus expanding the function of
the stan&trd unit control board. Carrier's diagnostic stan&trd
tier display tools such as Navigato( r_'_ device or Scrolling
Marquee c_m be used with the PremierLink controlle_:
The PremierLink controller (see Fig. 19) requires the use of
a Cmrier electronic thermostat or a CCN connection for time
broadcast to initiate its internal timeclock. This is necessary for
broadcast of time of day functions (occupied/unoccupied).
No
sensors are supplied with the field-mounted
PremierLink
control. The factory-installed
PremierLink
control includes
only the supply-air temperature (SAT) sensor and the outdoor
air temperature (OAT) sensor as standard. An indoor air quality
(CO2) sensor can be added as an option. Refer to Table 5 for
sensor usage. Refer to Fig. 20 for PremierLink controller wiring. The PremierLink control may be mounted in the control
panel or an mea below the control panel.

0° F

in the location

Motor Mount -- To ensure proper fan height, replace file existing motor mount with the new motor mount provided with
accessory.
Tran@nw_er (460 and 575-v Units Only) -- On 460 and
575-volt units a transformer is required. The transformer is
provided with the accessory and must be field-installed.

NOTE: PremierLink controller version 1.3 and kiter is shipped
in Sensor mode. If used with a fl_ermostat, the PremierLink
controller must be configured to Thermostat mode.

MotormasWr I Control -- Recommended
mounting location is
on the inside of the panel to the left of the control box. The
control should be mounted on the inside of the panel, vertic:dly, with leads protruding from bottom of extrusion.

Install the Supply Air Temperature
(SAT) Sensor -- When
the unit is supplied with a factory-mounted
PremierLink control, the supply-air temperature (SAT) sensor (33ZCSENSAT)
is factory-supplied
and wired. The wiring is routed from the
PremierLink control over the control box, through a grommet,
into the fan section, down along the back side of the fan, and
along the fan deck over to the supply-air opening.

The SAT probe is wire-tied to the supply-air opening (on the
horizontal opening end) in its shipping position. Remove the
sensor for installation. Re-position the sensor in the flange of
the supply-air opening or in the supply air duct (as required by
loc_d codes). Drill or punch a 1/2-in. hole in the flange or duct.
Use two field-supplied, self-drilling screws to secure the sensor
probe in a horizontal orientation.
NOTE: The sensor must be mounted in the discharge airstream
downstream of file cooling coil and any heating devices. Be
sure the probe tip does not come in contact with any of the unit
or heat surfaces.
Outdoor Air Temperature
(OAT) Sensor -- When the unit is
supplied with a factory-mounted
PremierLink
control, the
outdoor-air temperature sensor (OAT) is factory-supplied
and
wired.
Install the Indoor Air Quality (COa2 Sensor -- Mount the
optional indoor air quality (CO2) sensor according to manufacturer specifications. A separate field-supplied transformer must
be used to power the CO2 sensor:

MOTORMASTER------SENSOR
LOCATION

Wire the CO2 sensor to the COM and IAQI terminals of J5
on the PremierLink controlle_: Refer to the PremierLink Instalkition, Start-up, and Configuration
Instructions
for detailed
wiring and configuration information.

HAIRPIN END
NOTES:
1. All sensors are located on the eighth hairpin up from the bottom.
2. Field-installed tubing insulation is required to be installed over the TXV
(thermostatic expansion valve) bulb and capillary tube for proper operation
at low ambients. Tubing insulation is only required on the portion of suction line located between indoor and outdoor section.

Fig. 18 -- Motormaster_) I Sensor Locations

HVAC

SENSOR

INPUTS

(
SPACE TEMP

_STAT
C_

SET POINT
_RN

SUPPLY AIR TEMP
OUTDOOR

DUAL

TEMP

INDOOR

AIR QUALITY

OUTDOOR

AIR QUALITY

MODE

SENSOR

=o_]oi

_s} _

Fatt Nmnboc &_OSPREMLK

..... --

PremlerL_nk

(STAT)

COMP SAFETY (Y1) 7
FIRE SHUTDOWN

(Y2) /

SUPPLY FAN STATUS (Wl)
NOT USED (W2)
/
ENTHALPY

STATUS (ENTH)

/CCN/LEN
PORT

NAVIGATOR
PORT

4-20MA
ECONOMIZER

INDOOR
FAN MOTOR

"4 "-4 "-..
COMPR
1 &2

HEAT
LOW/HIGH

EXHAUST
RVSVALVE

OUTPUTS

Fig. 19-

PremierLink

Controller

Table 5 -- PremierLink Sensor Usage
APPLICATION
Differential

OUTDOOR
TEMPERATURE

AIR
SENSOR

RETURN
TEMPERATURE

AIR
SENSOR

OUTDOOR
AIR
ENTHALPY
SENSOR

RETURN AIR
ENTHALPY
SENSOR

Dry Bulb

Temperature
with
PremierLink*
(PremierLink
requires
4-20 mA
Actuator)
Single Enthalpy
with
PremierLink*
(PremierLink
requires
4-20 mA
Actuator)
Differential
Enthalpy
with PremierLink*
(PremierLink
requires
4-20 mA
Actuator)

Included -HH79NZ039

Required -33ZCT55SPT
or Equivalent

Included -Not Used

Required -33CSENTHSW
or
HH57AC077

IncludedNot Used

Required -33CSENTHSW
(HH57ZC003)
or
H H57AC077

*PremierLink control requires supply air temperature sensor 33ZCSENSAT and
outdoor air temperature sensor HH79NZ039 -- Included with factory-installed PremierLink control;
field-supplied and field-installed with field-installed PremierLink control.
NOTES:
1. CO2 Sensors (Optional):
33ZCSENCO2 -- Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.
33ZCASPCO2 -- Aspirator box used for duct-mounted CO2 room sensor.
33ZCT55CO2 -- Space temperature and CO2 room sensor with override.
33ZCT56CO2 -- Space temperature and CO2 room sensor with override and setpoint.
2. All units include the following Standard Sensors:
Outdoor-air sensor -- 50HJ540569 -- Opens at 67 F, closes at 52 F, not adjustable.
Mixed-air sensor -- HH97AZ001 -- (PremierLink control requires supply air temperature sensor 33ZCSENSAT
and outdoor air temperature sensor HH79NZ039)
Compressor lockout sensor -- 50HJ540570 -- Opens at 35 E closes at 50 E

Required -33CSENTSEN
or
HH57AC078

BLUE
[_

BLU

SPT

BRN

_LK

PremierLink
Control

COM
_

BLK
GRN

tOM

BRN

WHT

•

ORN

BRN

•

_RN

tOM

_o _

_ SASP + 5 and economizer
position > 80%,
economizer will go to minimum position for 3 minutes or
until SAT > 68 E
First stage of mechanical cooling will be energized.
Integrator resets.
Economizer
opens again and controls to current SASP
after stage one on for 90 seconds.
With YI and Y2 energized
economizer
maintains
an
SASP = SATLO2 + 3.
If SAT > SASP + 5 and economizer
position >80%,
economizer will go to minimum position for 3 minutes or
until SAT > 68 E
If compressor
one is on then second stage of mechanical
cooling will be energized. Otherwise the first stage will
be energized.
Integrator resets.
Economizer
opens again and controls
to SASP after
stage one on for 90 seconds.
Routine

•
•

economizer

3 (OAT > 68)

Economizer is opened 100%.
Compressors
1 and 2 are cycled based on YI and Y2
using minimum on and off times and watching the supply air temperature
as compared
to SATLOI
and
SATLO2 set points.

If optional power exhaust is installed, as the outdoor-air
&tmper opens and closes, the power exhaust fans will be energized and deenergized.
If field-installed accessory CO2 sensors me connected to the
PremierLink TM control, a PID-controlled
demand ventilation
strategy will begin to operate. As the CO2 level in the zone
increases above the CO2 set point, the minimum position of the
cktmper will be increased proportionally.
As the CO2 level
decreases because of the increase in fresh air, the outdoor-air
&lmper will be proportionally closed.

HEATING.
UNITSWITHECONOMISER2,
PREMIERLINK
CONTROL
ANDA THERMOSTAT
-- Whenthethermostat
c_dls
forheating,
terminal
WI is energized.
ThePremierLink
control
willmovetheeconomizer
damper
totheminimum
positionif thereisacallforGandclosed
if thereisacallforWI
without
G Inordertoprevent
thermostat
fromshortcycling,
theunitislocked
intotheheating
mode
foratleast10minutes
whenWI isenergized.
Onunitsequipped
fortwostages
ofheat,whenadditional
heatisneeded,
W2isenergized
andtheelectric
heat(if used)
comes
on.Whenthethermostat
is satisfied
andWI isdeenergized,
theIFMstops.
COOLING.
UNITS WITH ECONOMISER2,
PREMIERLINK CONTROL
AND A ROOM SENSOR -- When free
cooling is not available, the compressors will be controlled by
the PremierLink controller using a PID Error reduction c_flculation as indicated by Fig 41.
The PremierLink controller will use the following information to determine if free cooling is available:
• Indoor fan has been on for at least 30 seconds.
• The SPT. SAT. and OAT inputs must have valid readings.
• OAT must be less than 75 F.
• OAT must be less than SPT.
• Enthalpy
must be LOW (may be jumpered
if and
enthalpy sensor is not available).
• Economizer
position is NOT forced.
When free cooling is available, the outdoor-air damper is positioned through the use of a Proportional Integral (PlD) control
process to provide a calculated supply-air temperature into the
zone. The supply air will maintain the space temperature between the heating and cooling set points as indicated in Fig. 42.

If field-installed
accessory CO2 sensors tue connected to
the PremierLink control, a PID-controlled
demand ventilation
strategy will begin to operate. As the CO2 level in file zone
increases above the CO2 set point, the minimum position of the
damper will be increased proportionally.
As the CO2 level
decreases because of the increase in fresh all: the outdoor-air
damper will be proportionally closed.
HEATING. UNIT WITH ECONOMISER2,
PREMIERLINK
CONTROL AND A ROOM SENSOR -- Every 40 seconds
the controller will calculate the required heat stages (maximum
of 3) to maintain supply-air temperature (SAT) if the following
qu_difying conditions are met:
• Indoor fan has been on for at least 30 seconds.
• COOL mode is not active.
• OCCUPIED,
TEMRCOMPENSATED
START or HEAT
mode is active.
• SAT reading is available.
• Fire shutdown mode is not active.
If all of the above conditions me met, the number of heat
stages is c_dculated; otherwise the required number of heat
stages will be set to 0.
If file PremierLink controller determines that heat stages are
required, the economizer dmnper will be moved to minimum
position if occupied and closed if unoccupied.
Staging should be as follows:
If Heating PID STAGES=2
•
•

HEAT STAGES=I
HEAT STAGES=2

(75% capacity) will energize HSI
(100% capacity) will energize HS2

In order to prevent short cycling, the unit is locked into the
Heating mode forat least 10 minutes when HSI is deenergized.
On units equipped for two stages of heat, when additional heat
is needed, it may be provided by electric heat (if supplied).
When the space condition is satisfied and HSI is deenergized
the IFM stops. The fan will mn continuously in the occupied
mode as required by national energy and fresh air standards.

The PremierLink
control will integrate the compressol.s
stages with the economizer based on simiku logic as the three
routines listed in the previous section. The SASP will float up
and down based on the error reduction calculations that comptue space temperature
and space set point. The reversing
valves will be energized.
When outdoor-air temperature conditions require the economizer to close for a compressor stage-up sequence, the economizer control integrator is reset to zero after the stage-up sequence is completed. This prevents the supply-air temperature
from &opping too quickly and creating a freeze condition that
would make the compressor turn off prematurely.
The high space set point is used for DX (direct expansion)
cooling control, while the economizer space set point is a
c_dculated value between the heating and cooling set points.
The economizer set point will always be at least one degree
below the cooling set point, allowing for a smooth transition
from mechanical
cooling with economizer
assist, back to
economizer
cooling as the cooling set point is achieved.
The compressors
may be used for initkfl cooling then the
PremierLink controller will modulate file economizer using an
enor reduction calculation
to hold the space temperature
between the heating and cooling set points. See Fig. 42.
The controller uses the following conditions to determine
economizer cooling:
• Enthalpyis
Low.
• SAT reading is available.
• OAT reading is available.
• SPT reading is available.
• OAT < SPT
• Economizer
Position is NOT forced.

TEMPERATURE

CONTROL

75,
744

_:
££

734

nm 724

...... SET

POINT

714
I-

TEMPERATURE

704

694
co

68 J

TIME

NOTE: PremierLink control performs smart staging of 2 stages of
DX cooling and up to 3 stages of heat.
TM

Fig. 41 --

DX Cooling Temperature
Control Example

TEMPERATURE

OC
W

73
74 1_.__

If any of the above conditions are not met, the economizer
submaster reference (ECSR) is set to maximum limit and the
dmnper moves to minimum position. The operating sequence
is complete. The ECSR is recalculated every 30 seconds.

......... _

711

704 ........

69
69

CONTROL

....................................

------COOL SETPO[NT

TEMPERATURE

---

HEAT

_v_ ..........................

TIME

If an optional power exhaust is inst_dled, as the outdoor-air
dmnper opens and closes, the power exhaust fans will be
energized and deenergized.

Fig. 42 -- Economizer Temperature
Control Example
34

SETPOINT

SERVICE

a Size 015 Only: Loosen belt by loosening fan motor
mounting plate nuts.
b. Size 017 Only: Loosen nuts on the 2 carriage bolts
in the motor mounting base. Install jacking bolt
and plate under motor base (bolt and plate are
shipped in installer's packet). See Fig, 45. Using
bolt and plate, raise motor to top of slide and
remove belt. Secure motor in this position by tightening the nuts on the carriage bolts.
3. Ix_osen movable-pulley flange setscrew (see Fig. 43).
4. Screw movable flange tow_ud fixed flange to increase
speed and away from fixed flange to decrease speed. Increasing fan speed increases load on motol: Do not exceed mtcximum speed specified in Table 1.
See Table 14 for air quantity limits.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew. (See Table 1 for speed change for each
lhll turn of pulley flange.)
6. Replace and tighten belts. See Belt Tension Adjustment
section on page 36.
To align fan and motor pulleys:
1. Ix_osen fan pulley setscrews.
2. Slide fan pulley along fan shaft.
3. Make anguku" alignment by loosening motor from
mounting plate.

Before performing service or maintenance operations on
unit, turn off main power switch to unit. Tnm off accessory
heater power switch if applicable. Electrical shock could
cause pelNonal injury.

Cleaning-

Inspect unit interior at beginning
of each
heating and cooling season and as operating conditions require.
Remove unit top panel and/or side panels for access to unit
interiol:
EVAPORATOR
cial coil cleanel:

COIL -- Clean as required

with a commer-

CONDENSER
COIL--Clean
condenser coil annually and
as required by location and outdoor-air conditions. Inspect coil
monthly -- clean as require&
CONDENSATE
DRAINCheck and clean each year
start of cooling season. In wintel: keep drains and trap &T.

FILTERS -- Clean or replace at start of each heating and cooling season, or more often if operating conditions require. Refer
to Table 1 for type and size.
OUTDOOR-AIR
INLET SCREENS -- Clean screens with
steam or hot water and a mild detergent. Do not use throwaway
filters in place of screens.

Evaporator Fan Service and Replacement
50HJ015 UNITS (See Fig. 44)
NOTE: To remove belts only, follow Steps 1-6.
1. Remove filter and supply-air section panels.
2. Remove unit top panel.
3. Ix_osen cguriage nuts A and B holding motor mount assembly to fan scroll side plates.
4. Ix_osen screw C.
5. Rotate motor mount assembly (with motor attached) as
far as possible away from evaporator coil.
6. Remove belt.

Lubrication
COMPRESSORSEach compressor
is charged with the
correct amount of oil at the factory. Conventional white oil
(Sontext 200LT) is used. White oil is compatible with 3GS oil,
and 3GS oil may be used if the addition of oil is required. See
compressor nameplate for origimd oil charge. A complete rech_uge should be four ounces less than the origimd oil charge.
When a compressor is exchanged in the field it is possible that
a major portion of the oil from the replaced compressor may
still be in the system. While this will not affect the reliability of
the replacement compressol: the extra oil will add rotor diag
and increase power usage. To remove this excess oil, an access
valve may be added to the lower portion of the suction line at
the inlet of the compressol: The compressor should then be mn
for 10 minutes, shut down, and the access valve opened until
no oil flows. This should be repeated twice to make sure the
proper oil level has been achieved.
FAN SHAFT BEARINGS -- For size 015 units, bearings are
permanently
lubricated. No field lubrication is required. For
size 017 units, the bearings are of the pillow block type and
have grease fittings. The bearing opposite the motor end has an
extended tube line so it can be lubricated from the motor side.
Lubricate the bearings twice annu_dly.

BE PARALLEL
WITH BELT

PULLEY

ENSURE PROPER
CLEARANCE BETWEEN
8ELT(_ AND FAN

Typical lubricants _ue given below:
MANUFACTURER
Texaco
Mobil
Sunoco
Texaco

MOVABLE
FLANGES

LUBRICANT
Regal AFB-2*
Mobilplex EP No. 1
Prestige 42
Multifak 2

PULLEY

*Preferred lubricant because it contains rust and oxidation inhibitors.

MOTOR AND FAN
SHAFTS MUST BE
PARALLEL
SETSCREWS

CONDENSER
AND
EVAPORATOR-FAN
MOTOR
BEARINGS
-- The condenser-fan and evaporator-fan motors
have permanently
sealed beguings, so no field lubrication is
necessguy.

FIXED FLANGES

SINGLE-GROOVE

Evaporator
Fan
Performance
Adjustment
(Fig. 43-45) -- Fan motor pulleys are factory set for speed
shown in Table 1.
To change fan speeds:

Fig. 43 -- Evaporator-Fan Pulley Alignment
and Adjustment

1. Shut off unit power supply.
35

7.
8.
9.

Rotate motor mount assembly back past original position
tow_ud evaporator coil.
Remove motor mounting nuts D and E (both sides).
Lift motor up through top of unit.

CENTER POST
FAN PULLEY_

10. Reverse above procedure to reinstall motol:
11. Check and adjust belt tension as necessary.

BELT

50HJ017 UNITS (See Fig. 45)--The
50HJ017 units use a
fan motor mounting system that features a slide-out motor
mounting plate. To replace or service file motor, slide out the
bracket.

MOTOR

SUDING MOTOR

1. Remove the evaporator-fan access panel and file heating
control access panel.
2. Remove the center post (located between the evaporator
fan and heating control access panels) and all screws securing it.
3. Ix_osen nuts on the two carriage bolts in the motor mounting base.
4.

Remove jacking bolt and tapped jacking bolt plate.
Remove the 2 screws that secure the motor mounting
plate to the motor support channel.

8.
9.

Remove the 3 screws from file end of the motor support
channel that interfere with the motor slide path.
Slide out the motor and motor mounting plate.

10.

and remove the 4 mount-

Disconnect wiring connections
ing bolts.
11. Remove file motol:

12.

MOTOR _

PLATE
MOTOR
PLATE

Using jacking bolt under motor base, raise motor to top of
slide and remove belt. Secure motor in this position by
tightening the nuts on the carriage bolts.
Remove the belt drive.

6.
7.

MOTORSUPPORT
CHANNEL

Fig. 45 -- 50HJ017 Evaporator-Fan

Belt Tension

Adjustment

Motor Section

To adjust belt tension:

1. Loosen fan motor bolts.
2.

Adjust belt tension:
a.

Size 015 Units: Move motor mounting plate up or
down for proper belt tension (1/2 in. deflection with
one finger).

Size 017 Units: Turn motor jacking bolt to move
motor mounting plate up or down for proper belt
tension (3/8 in. deflection at midspan with one finger [9 lb forcel).

UNIT TOP PANEL
D

JACKINGBOLT

NOTE: A 31/2-in. bolt and threaded plate are included in the
installer's packet. They should be added to the motor support channel below the motor mounting plate to aid in raising the motor. The
plate part number is 50DP503842. The adjustment bolt is 3/8- 16 x
13/4 LG.

To inst_dl the new motor, reveLse Steps 1-11.

MOTOR
PULLEY

PULLEY

MOTOR _.

Tighten nuts.

Adjust bolts and nut on mounting
fixed position.

Condenser-Fan
50HJ015

plate to secure motor in

Adjustment

AND 017 UNITS

(Fig. 46)

1. Shut off unit power supply.
FAN
_,

PULLEY

FAN SCROLL
SIDE PLATES

2.
3.

Remove access panel(s) closest to the fan to be adjusted.
Loosen fan hub setscrews.

Adjust fan height on shaft using a straightedge
across the fan orifice.

Tighten setscrews and replace panel(s).

Turn on unit power.

_
DRAIN
CONNECTION

0"62 +-8:_5

NOTE: Dimensions are in inches.
Fig. 46 -- Condenser-Fan
50HJ015,017

Fig. 44 -- 50HJ015 Evaporator-Fan
Motor Section
36

placed

Adjustment,

Power Failure -- Dampers

have a spring return. In event
of power failure, &tmpo.s will return to fully closed position
until power is restored. Do not manually operate damper

refrigerant chm'ge on systems using the MoistureMiSer
dehumidification
package, charge per the stan&ud subcooling
charts. The subcooler MUST be deenergized to use the charging charts. The charts reference a liquid pressure (psig) and
temperature at a point between the condenser coil and the subcooler coil. A tap is provided on the unit to measure liquid
pressure entering the subcooler (leaving the condenser).

gO_()E

Refrigerant Charge

-- Amount of refligelant chalge is
listed on unit nameplate and in Table 1. Refer to Cmrier GI'AC
II; Module 5; Charging, Recovery, Recycling, and Reclmnation
section for chmging methods and procedures. Unit panels must
be in place when unit is operating during charging procedure.
NOTE: Do not use recycled refligerant
taminants.

Filter Drier

-- Replace
posed to atmosphere.

as it may contain con-

Protective
Overtemperature
tor to protect
temperatures.

LOW CHARGE
COOLING -- Using cooling charging chart
(see Fig. 47), add or remove refrigerant until conditions of the
chmt are met. Note that chmging chmt is different from those
norm;ally used. An accurate pressure gage and temperaturesensing device is required. Charging is accomplished by ensuring the proper amount of liquid subcooling. Measure liquid line
pressure at the liquid line service valve using pressure gage.
Connect temperature sensing device to the liquid line nero the
liquid line service valve and insulate it so that outdoor ambient
temperature does not affect reading.

Overcurrent
protection.

100

150

200

LIQUID PRESSURE

Fig. 47 --

Cooling

250

300

350

400

-- Each compressor has an intern_fl protecit against excessively
high discharge
gas

-- Each compressor

has internal line break motor

energize the crankcase heaters for 24 houLs before stmtIMPORTANT:
After prolonged shutdown or servicing,
ing the compressors.

FREEZE PROTECTION
THERMOSTAT
(FPT) -- An FPT
is located on the top and bottom of the evaporator coil. It detects frost build-up and turns off the compressor, allowing the
coil to clem: Once the frost has melted, the compressor can be
reenergized.

Chart

TO USE THE COOLING CHARGING
CHART -- Use the
above temperature and pressure readings, and find the intersection point on the cooling charging chart. If intersection point on
chin1 is above line, add refrigerant. If intersection point on
chmt is below line, carefully recover some of the charge. Recheck suction pressure as charge is adjusted.
NOTE: Indoor-air cfm must be within normal operating
of unit. All outdoor fans must be operating.

PROTECTION

Compressor Lockout -- If any of the safeties (high-pressure,
low-pressure, freeze protection thermostat, compressor internal
thermostat) trip, or if there is loss of power to the compressors,
the CLO (compressor lockout) will lock the compressors off.
To reset, manu_dly move the thermostat setting.
EVAPORATOR
FAN MOTOR PROTECTION
-- A manu_fl reset, calibrated trip, magnetic circuit breaker protects
against overcurrent. Do not bypass connections or increase the
size of the breaker to correct trouble. Determine the cause and
correct it before resetting the breakel:
CONDENSER-FAN
MOTOR PROTECTION
-Each
condenser-fan
motor
is internally
protected
against
overtemperature.
HIGH-PRESSURE
AND LOW-PRESSURE
SWITCHES
-If either switch trips, or if the compressor overtemperature
switch activates, that refrigerant circuit will be automatically
locked out by the CLO. To reset, manually move the thermostat setting.

AT LIQUID VALVE (PSIG)

Charging

system is ex-

Crankcase Heater -- All units are equipped with a 70-watt
crankcase heater to prevent absorption of liquid refrigerant by
oil in the crankcase when the compressor is idle. The crankcase
heater is energized whenever there is a main power to the unit
and the compressor is not energized.

BOTH CIRCUITS
ALL OUTDOOR FANS MUST BE OPERATING

refrigerant

Devices

COMPRESSOR

NO CHARGE -- Use standard evacuating techniques. After
evacuating system, weigh in the specified alnount of refrigerant (refer to Table 1).

whenever

Relief
Devices
-- All units have relief devices to protect
against &_mage from excessive pressures (e.g., fire). These devices protect the high and low side.

range

Control Circuit, 24-7

-- This control circuit is protected against overcunent
by a 3.2-amp circuit breakel: Breaker
can be reset. If it trips, determine cause of trouble before resetting. See Fig. 48 and 49.

The TXV (thermostatic expansion valve) is set to maintain
between 15 and 20 degrees of superheat at the compressors.
The valves are factory set and should not require re-adjustment.
MOISTUREMISER
TM SYSTEM
CHARGING
-- The system charge for units with the MoistureMiSer
option is greater
than that of the stan&_rd unit _done. The charge for units with
this option is indicated on the unit nameplate &awing. To
chmge systems using the MoistureMiSer
dehumidification
package, fully evacuate, recover, and re-chmge the system to
the nameplate
specified charge level. To check or adjust

Replacement
parts may
request.

Parts

be obtained

Diagnostic

LEDs

for diagnostic
page 41.

purpose.

-- A complete list of replacement
from any Carrier distributor upon

-- The unit control bo_uds have LEDs
Refer to Troubleshooting
section on

I
I

Optional

Hinged Access Doors --When the optional
service package is ordered or the if the hinged access doors
option is ordered, the unit will be provided with external and
internal hinged access dool_ to facilitate service.

OFF position to open the dool: Two doors are provided for access to the compressor comp_utment.
Two internal access doors are provided inside the tilter/
drive access dool: The filter access door (on the left) is secured
by 2 small 1/4 turn latches with folding bail-type handles. This
door must be opened prior to opening the drive access dool:
The (hive access door is shipped with 2 sheet metal screws
holding the door closed. Upon initial opening of the dooL these
screws may be removed and discarded. The door is then held
shut by the tilter access door. which closes over it.

Four external hinged access doors are provided. All extern_d
doors me provided with 2 lalge 1/4 turn latches with folding
bail-type handles. (Compressor access doors have one latch.) A
single door is provided for filter and drive access. One door is
provided for control box access. The control box access door is
interlocked with the non-fused disconnect which must be in the

SCHEMATIC
S_E _L_¢_IC

[L[CT_IC_EAT OPTION

ELECTRIC
2081240V
AHPS

1411188
2571342

117/135

200/230V
KW

B
C

HEAT

A 393/453
7131823

I
I

H_3

42.2/561
YE

I
I

I
c_

2eB1_30-3 6e

CLO_

_IELD
_OWER
SUPPLY

_'"-£_4

)....

I
I
L°?_LJ

_ct

_rc

ire

Fig. 48 -- Typical Wiring Schematic
39

(50HJ015 208/230 V Shown)

ELECTRIC

HEAl

OPIIOH

I [_

[_]ZL[CTRIC HZAT

OPTION

I
l

I _

[_
[_ZLECTRIC

HZAT

OP_ IO_

L_
(B)

(A)

(C)

COMPONENT ARRANGEMENT

Y_L

'I ,IiI_
=IBII

0_°:°I ='%=,

ORN

s[l$11

(ll

(}I)

_'Y2=,E_°,_
LI_EI--

--\

, ,,-,_,._,=_°9:2q×- i
l_es[wso_

:[]:

It_s

o'_,

,,_1_'; 0

LEGEND
RL_-8

AHA
C
CAP
CB
CO
OH
CLO
COMP
OR
DM
DU
EQUIP
FL
FPT
FU
GND
HC
HPS
HTR
IAQ
IFC
IFM
IFR
L
LOR
LPS
LS
NEC
OAT
OCCUP
OFC
OFM
PL
PRI
QT
RAT
SW
TB
TC
TH
TRAN

Adjustable, Heat Anticipator
Contactor, Compressor
Capacitor
Circuit Breaker
Cooing Compensator
Crankcase Heater
Compressor
Lockout
Compressor Motor
Control Relay
Damper Motor
Dummy Terminal
Equipment
Filament
Freeze Protection Thermostat
Fuse
Ground
Heater Contactor
High-Pressure
Switch
Heater
Indoor Air Quality Sensor
Indoor Fan Contactor
Indoor Fan Motor
Indoor Fan Relay
Light
Lockout Relay
Low-Pressure
Switch
Limit Switch
National Electrical Code
Outdoor Air Temperature Sensor
Occupancy Sensor
Outdoor Fan Contactor
Outdoor Fan Motor
Plug Assembly
Prknary
Quadruple Terminal
Return Air Temperature Sensor
Switch
Terminal Block
Thernlostat Cooling
Thermostat Heating
Transformer
Terminal

Terminal

COnTrOL
BOX

PL_
pLI.lO

Terminal
•

_rlg£O

$_tIC{

Block

Splice

Factory Wiring

....

Accessory

Field Control Wiring
or Optional

Wiring

To indicate common potential
not to represent wiring.
Economizer
Remote

Motor

POT Field Accessory

OAT Sensor
Disch Air Sensor

(Marked)

RAT Accessory

(Unmarked)

Low Ambient

Sensor
Lockout Switch

only;

NOTES:
1. Compressor
and/or fan motor(s) thermally
protected three phase
motors protected against primary single phasing conditions.
2. If any of the original wire furnished must be replaced, it must be
replaced with Type 90 ° C or its equivalent.
3. Jumpers are omitted when unit is equipped with economizer.
4. I FCB must trip amps is equal to or less than 140% FLA.
5. On TRAN1 use BLK lead for 460-v power supply and ORN lead for
575w power supply.
6. The CLO locks out the compressor to prevent short cycling on corm
pressor overload and safety devices; before replacing CLO check
these devices.
7. Number(s) indicates the line location of used contacts. A bracket
over (2) numbers signifies a single pole, double throw contact. An
underlined
number signifies a normally closed contact. Plain (no
line) number signifies a normally open contact.
8. 620 Ohm, 1 watt, 5% resistor should be removed only when using
differential enthalpy or dry bulb.
9. If a separate field-supplied
24 v transformer
is used for the IAQ
sensor power supply, it cannot have the secondary of the transformer grounded.
10. OAT sensor is shipped inside unit and must be relocated in the field
for proper operation.
11. For field installed remote minimum position POT. remove black wire
jumper between P and P1 and set control minimum posgion POT to
the minimum position.

Fig. 49 -- Typical Component Arrangement (50HJ015 Unit Shown)
40

TROUBLESHOOTING

Unit Troubleshooting
troubleshooting

should turn on. The actuator should drive to between 90
and 95% open.
4. Turn the Exhaust potentiometer CW until the Exhaust
LED turns off. The LED should turn off when the
potentiometer is approximately 90%. The actuator should
lemain in position.
5. Turn the DCV set point potentiometer CW until the DCV
LED turns off. The DCV LED should turn off when the
potentiometer is approximately 9-v. The actuator should
(hive fully closed.
6. Turn the DCV and Exhaust potentiometers
CCW until
the Exhaust LED turns on. The exhaust contacts will
close 30 to 120 seconds after the Exhaust LED turns on.
7. Return EconoMiSerlV
settings and wiring to norlnal
after completing troubleshooting.
DCV MINIMUM AND MAXIMUM POSITION -- To check
the DCV minimum and maximum position:

Refer to Tables 19 and 20 for

details.

EconoMiSerlV

Troubleshooting--

for EconoMi$erIV

logic.

See

Table

A limctional view of file EconoMiSerIV is shown in Fig. 50.
Typic;d settings, sensor ranges, and jumper positions ;ue also
shown. An EconoMiSerIV simuhttor program is available from
Cartier to help with EconoMiSerlV training and troubleshooting.
ECONOMISERIV
PREPARATION
-- This procedure
is
used to prepare the EconoMiSerIV
for troubleshooting.
No
troubleshooting or testing is done by performing the following
procedure.
NOTE: This procedure requires a 9-v battery. 1.2 kilo-ohln
resistol: and a 5.6 kilo-ohm resistor which are not supplied
with the EconoMiSerlV.
IMPORTANT:
tiometers
before Bestarting
sure totroubleshooting.
record the positions

1. Make sure EconoMiSerIV
preparation
procedure
has
been performed.
2. Connect a 9-v battery to AQ (positive node) and AQI
(negative node). The DCV LED should turn on. The
actuator should drive to between 90 and 95% open.
3. Turn the DCV Maximum Position potentiometer to midpoint. The actuator should drive to between 20 and 80%
open.
4. Turn the DCV Maximum Position potentiometer to fully
CCW. The actuator should drive fully closed.
5. Turn the Minimum Position potentiometer
to midpoint.
The actuator should drive to between 20 and 80% open.
6. Turn the Minimum Position Potentiometer fully CW. The
actuator should drive fully open.
7. Remove the jumper from TR and N. The actuator should
chive fully closed.
8. Return EconoMi$erIV
settings and wiring to normal
after completing troubleshooting.

of all poten-

1. Disconnect power at TR and TRI. All LEDs should be
off. Exhaust fan contacts should be open.
2. Disconnect device at P and PI.
3. Jumper P to PI.
4. Disconnect wires at T and TI. Place 5.6 kilo-ohm resistor
across T and TI.
5. Jumper TR to 1.
6. Jumper TR to N.
7. If connected, remove sensor from terminals So and +.
Connect 1.2 kilo-ohm 4074EJM checkout resistor across
terminals So and +.
8. Put 620-ohm resistor across terminals SR and +.
9. Set minimum position, DCV set point, and exhaust
potentiometers fully CCW (counterclockwise).
10. Set DCV maximum
position potentiometer
lhlly CW
Iclockwise).
11. Set enthalpy potentiometer to D.
12. Apply power (24 vac) to termimds TR and TRI.
DIFFERENTIAL
ENTHALPY-To check
differential
enthalpy:
1. Make sure EconoMiSerIV
preparation
procedure
has
been performed.
2. Place 620-ohm resistor across So and +.
3. Place 1.2 kilo-ohm resistor across SR and +. The Free
Cool LED should be lit.
4. Remove 620-ohm resistor across So and +. The Free
Cool LED should turn off.

SUPPLY-AIR INPUT -- To check supply-air input:
1. Make sure EconoMiSerlV
preparation
procedure
has
been performed.
2. Set the Enthalpy potentiometer to A. The Free Cool LED
turns on. The actuator should drive to between 20 and
80% open.
3. Remove the 5.6 kilo-ohm resistor and jumper T to TI.
The actuator should drive fully open.
4. Remove the jumper across T and TI. The actuator should
(hive fully closed.
5. Return EconoMiSerIV
settings and wiring to normal
after completing troubleshooting.
ECONOMISER
IV TROUBLESHOOTING
COMPLETION -- This procedure is used to return the EconoMiSerlV
to operation. No troubleshooting or testing is done by performing the following procedure.

Return EconoMiSerIV
settings and wiring to normal
after completing troubleshooting.
SINGLE ENTHALPY
-- To check single enth_dpy:
1. Make sure EconoMiSerIV
preparation
procedme
has
been performed.
2. Set the enthalpy potentiometer to A (fully CCW). The
Free Cool LED should be lit.
3.

Set the enthalpy potentiometer
Cool LED should turn off.

1. Disconnect power at TR and TRI.
2. Set enthalpy potentiometer to previous setting.
3. Set DCV maximum position potentiometer
to previous
setting.
4. Set minimum position, DCV set point, and exhaust
potentiometel_ to previous settings.
5. Remove 620-ohm resistor from terminals SR and +.
6. Remove 1.2 kilo-ohln checkout resistor from termimfls So
and +. If used, reconnect sensor from tennin_ds So and +.
7. Remove jumper from TR to N.
8. Remove jumper from TR to 1.
9. Remove 5.6 kilo-ohln resistor from T and TI. Reconnect
wires at T and TI.
10. Remove jumper from P to PI. Reconnect device at P and
PI.
11. Apply power (24 vac) to terminals TR and TRI.

to D (fully CW). The Free

Return EconoMiSerIV
settings and wiring to normal
after completing troubleshooting.
DCV (Demand
Controlled
Ventilation)
AND POWER
EXHAUST -- To check DCV and Power Exhaust:
1. Make sure EconoMiSerlV
preparation
procedure
has
been performed.
2. Ensure terminals AQ and AQI are open. The LED for
both DCV and Exhaust should be off. The actuator
should be fully closed.
3. Connect a 9-v battery to AQ (positive node) and AQI
(negative node). The LED for both DCV and Exhaust
41

Table 19 -- MoistureMi$er
PROBLEM
Subcooler Will Not Energize

Dehumidification

CAUSE

REMEDY

No power to subcooler
control transformer.

Check power source. Ensure all wire connections
are tight.

No power from subcooler control transformer
liquid line three-way valve.

Liquid line three-way valve
will not operate.
Subcooler

Will Not Deenergize

Low System Capacity

Subcooler Service Analysis

1, Fuse open; check
2, Subcooler control
Cycle unit off and
to reset, Replace
3. Transformer bad;

fuse, Ensure continuity of wiring.
low-pressure switch open,
allow low-pressure switch
switch if it will not close.
check transformer.

1, Solenoid coil defective; replace.
2, Solenoid valve stuck closed; replace.

Liquid Line three-way valve
will not close.

Valve is stuck open; replace.

Low refrigerant charge or
frosted coil.

1. Check charge amount. See system charging
section.
2, Evaporator coil frosted; check and replace
subcooler control low-pressure switch if necessary.

Table 20-- Cooling Service Analysis
PROBLEM

CAUSE

Compressor
and
Condenser Fan
Will Not Start.

REMEDY

Power failure.
Fuse blown or circuit breaker tripped.
Defective thermostat,
relay.
Insufficient

Compressor
Will Not
Start but Condenser Fan
Runs.

Compressor
Cycles
(other than normally
satisfying thermostat).

Call power company.
Replace fuse or reset circuit breaker.

contactor, transformer,

line voltage.

Determine cause and correct.
Check wiring diagram and rewire correctly.

Thermostat

Lower thermostat setting below room temperature.

setting too high.

Faulty wiring or loose connections in compressor circuit.
Compressor motor burned out, seized, or internal overload open.

Check wiring and repair or replace.
Determine cause. Replace compressor.

Defective overload.

Determine cause and replace.

Compressor

Determine cause for safety trip and reset lockout.

locked out

One leg of 3-phase power dead.

Replace fuse or reset circuit breaker.
Determine cause.

Refrigerant

Defective compressor.

Recover refrigerant, evacuate system, and recharge
to nameplate.
Replace and determine cause.

Insufficient line voltage.
Blocked condenser.

Determine cause and correct.
Determine cause and correct.

Defective overload.

Determine cause and replace.

overcharge or undercharge.

Faulty condenser-fan

Excessive
Pressure.

Head

Excessive
Pressure.

Suction
Low.

Too Low.

Suction

Pressure

Too

Replace thermostat.
motor.

Replace.

Restriction in refrigerant system.

Locate restriction and remove.

Dirty air filter.
Unit undersized for load.

Replace filter.
Decrease load or increase unit size.

Thermostat

Reset thermostat.

set too low.

Low refrigerant charge.

Locate leak, repair, and recharge.

Air in system.

Recover refrigerant,

Condenser coil dirty or restricted.

Clean coil or remove restriction.

Dirty air filter.
Dirty condenser

Replace filter.
Clean coil.

Refrigerant

Head Pressure

coil.

overcharged.

evacuate system, and recharge.

Recover excess refrigerant.

Faulty TXV.

1. Check TXV bulb mounting and secure tightly to
suction line.
2. Replace TXV if stuck open or closed.

Air in system.

Recover refrigerant,

Condenser air restricted or air short-cycling.

Determine cause and correct.

Low refrigerant charge.

Check for leaks, repair, and recharge.

Restriction in liquid tube.

Remove restriction.

High heat load.
Faulty TXV.

Check for source and eliminate.
1. Check TXV bulb mounting and secure tightly to
suction line.
2. Replace TXV if stuck open or closed.

Refrigerant

Recover excess refrigerant.

overcharged.

evacuate system, and recharge.

Dirty air filter.
Low refrigerant charge.

Replace filter.
Check for leaks, repair, and recharge.

Metering device or low side restricted.

Remove source of restriction.

Faulty TXV.

1. Check TXV bulb mounting and secure tightly to
suction line.
2. Replace TXV if stuck open or closed.

Insufficient evaporator airflow.

Increase air quantity. Check filter and replace if
necessary.

Temperature too low in conditioned
Field-installed

area.

Reset thermostat.

filter drier restricted.

Replace.

LEGEND
TXV -- Thermostatic

Replace component.

Incorrect or faulty wiring.

Defective thermostat.

Compressor
Operates
Continuously.

or control

Expansion Valve

Table 21 -- EconoMi$erlV

Input/Output

Logic

INPUTS
Demand Control
Ventilation (DCV)
Below set
(DCV LED Off)

Above set
(DCV LED On)

OUTPUTS

Enthalpy*

N Terminalt

Compressor

Outdoor

Return

Stage
1

High
(Free Cooling LED Off)

Low

On
On

On
Off

On
On

On
Off

Off

Low
(Free Cooling LED On)

High

On
On

On
Off

Off

On
On

High
(Free Cooling LED Off)

Low

Low
(Free Cooling LED On)

High

*For single enthalpy control, the module compares
enthalpy to the ABCD set point.
tPower at N terminal determines Occupied/Unoccupied
24 Vac (Occupied), no power (Unoccupied).
**Modulation is based on the supply air sensor signal.
1-tModulation is based on the DCV signal.

Stage
2

Occupied

Unoccupied
Dam )er

Minimum position

Closed

Off
Off

Modulating** (between rain.
position and full-open)

Modulating** (between
closed and full-open)

Off

Minimum position

Closed

On
Off

On
On

On
Off

Modulating1-1- (between min.
position and DCV maximum)

Off

Modulatingtl(between
closed and DCV
maximum)

On
On

On
Off

Off
Off

Modulating***

Modulatingtl-t

Off

outdoor

***Modulation is based on the greater of DCV and supply air sensor
signals, between minimum position and either maximum position
(DCV) or fully open (supply air signal).
ttl-Modulation
is based on the greater of DCV and supply air sensor signals, between closed and either maximum position (DCV)
or fully open (supply air signal).

setting:

Fig. 50 -- EconoMi$erlV

Functional View

INDEX
Air quantity limits
31
Carrier Comfort Network®
Changeover setpoint
21
Charging chart, refrigerant
Clearance
4, 5
CO2 sensor
Configuration
24
Settings
23, 25
Compressor
Lockout
20
Lubrication
35
Mounting
28
Rotation
28
Concentric duct
Condensate drain
Cleaning
Location
Condenser
Cleaning
Condenser

Operating sequence
33, 34
Cooling
33
EconoMi$erlV
33
EconoMi$er2
with
PremierLinkcontrol
33,34
Heating
33
Outdoor air hood
lO, 11
Outdoor air temperature sensor
Outdoor air inlet screens
Cleaning
35
Dimensions
6

12
37

Physical data
6
Power supply
8
Wiring
8
PmmierLink controls

35
7, 8
coil
6
35
tim
6

Ac[iustment
36
Control circuit
37
Wiring
8
Convenience outlet
10
Crankcase heater
28, 37
Demand control ventilation
Dehumidification
24
Dfinensions
2, 3, 5
DuctwoN
4
EconoMiSerIV
18-24
Control mode
21
Controller wiring
19
Damper movement
23
Demand ventilation control
Enthalpy sensor
22
Troubleshooting
41, 44
Usage
21
Wiring
19
EconoMiSer2
18-20
Electrical connections
8
Electrical data
9
Electric heat
10

High pressure
6
Low pressure
6
Refrigerant
Cha_e
37
Type
6
Refrigerant sel_,ice ports
Replacement parts
37
Return air filter
6

Return air temperature
Rigging unit
4
Roof curb

Pulley adjustment
35, 36
Pulley setting
6, 32
Speed
6
Filter

sensor

Assembly
1
Dimensions
2
Leveling tolerances
2
Weight
6
Safety considerations
1
Sew,ice
35-40
Start-up
28-34
Start-up checklist
CL-1
Supply-air temperature sensor
Thermostat
8, 23
Troubleshooting
41-44
Weight
Corner
5
Economizer
6
Maximum
4
Unit
6
Wind baffle
11
Wiring
EconoMi$erIV
19
EconoMi$er2
20
Humidistat
26
Nou-fused disconnect
Power connections
8
PremierLink
14
Thermostat
8
Unit
39, 40

29-31

Cleaning
35
Size
6
Filter drier
37
Freeze protection thermostat
Heat anticipator settings
10
High-pressure
switch
6, 37
Hinged access door
38
Horizontal adapter roof curb
Humidistat
26

12-16

Pressure, drop
Electric heat 32
Economizer
32
MoistureMiSer
32
Pressure switches

Enthalpy changeover set points
Evaporator coil
6
Cleaning
35
Evaporator fan motor
Lubrication
35
Motor data
32
Mounting
Performance

12,20

6, 37

Indoor air quality sensor
12
Ix_w-pressure switch
6, 37
Manual outdoor air damper
10
MoistureMiSer TM dehumidification
package
25-2Z 37, 42
Motormaster®
I control
11, 12
Mounting
Compressor
28
Unit
4
Non-fused disconnect
10

12, 20

SERVICE

Packaged
discussed

Service Training programs
in this manual, including:

TRAINING

ate an excellent

way to increase your knowledge

• Unit Fmnilimization

• Maintenance

• InstCdlation Overview

• Operating

A large selection of product, theoty, and skills programs ;u'e available,
and materials. All include video and/or slides, plus companion book.

of the equipment

Sequence
using popular video-based

formats

Classroom
Service Training
which includes "hands-on" experience with the products in our labs can
mean increased confidence thai really pays dividends in faster troubleshooting and fewer callbacks. Course
descriptions and schedules are in our catalog.
CALL
I Packaged

FOR FREE

CATALOG

Service Training

[

1-800-644-5544
I Classroom

Service Training

Copyright 2006 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications
Catalog No. 04-53500012-01

Printed in U.S.A.

or designs without notice and without incurring obligations.

Form 50HJ-29SI

Pg 46

3-06

Replaces:

50HJ-25SI

START-UP

CHECKLIST

MODEL NO.:

SERIAL

DATE:

TECHNICIAN:

NO.:

I. PRE-START-UP:
[] VERIFY

THAT ALL PACKING

MATERIALS

HAVE BEEN REMOVED

[] VERIFY INSTALLATION
OF INDOOR FAN MOTOR
BOLT AND PLATE (017 UNITS)
[] VERIFY

INSTALLATION

OF OUTDOOR

[] VERIFY

THAT CONDENSATE

[] VERIFY

THAT ALL ELECTRICAL

ADJUSTMENT

BOLT (015 UNITS) OR ADJUSTMENT

AIR HOOD

CONNECTION

IS INSTALLED

CONNECTIONS

[] CHECK THAT FILTERS AND SCREENS
[] VERIFY

FROM UNIT

PER INSTRUCTIONS

AND TERMINALS

ARE TIGHT

ARE CLEAN AND IN PLACE

THAT UNIT IS LEVEL

[] CHECK FAN WHEEL
IS TIGHT

AND PROPELLER

FOR LOCATION

IN HOUSING/ORIFICE,

AND VERIFY

SET SCREW

2:
m

[] VERIFY

THAT FAN SHEAVES

[] VERIFY

THAT SCROLL

[] VERIFY

THAT CRANKCASE

ARE ALIGNED

AND BELTS ARE PROPERLY

TENSIONED

I--

COMPRESSORS

ARE ROTATING

IN THE CORRECT

DIRECTION
rm

HEATER

HAS BEEN ENERGIZED

FOR 24 HOURS

o,
<
I-

II. START-UP:

ELECTRICAL
SUPPLY

VOLTAGE

COMPRESSOR

AMPS

---

COMPRESSOR
COMPRESSOR

NO. 1
NO. 2

SUPPLY FAN AMPS

LI-L2

L2-L3

L3-LI

EXHAUST FAN AMPS

ELECTRIC HEAT AMPS (IF SO EQUIPPED)

TEMPERATU

2:
m

RES

rm
LU

OUTDOOR-AIR
RETURN-AIR
COOLING
ELECTRIC

TEMPERATURE

I-

F DB (Dry-Bulb)

TEMPERATURE

F DB

SUPPLY AIR

F WB (Wet-Bulb)

HEAT SUPPLY AIR (IF SO EQUIPPED)_

<
I-

PRESSURES
REFRIGERANT

SUCTION

CIRCUIT

NO. I

PSIG

CIRCUIT

NO. 2

REFRIGERANT

DISCHARGE

CIRCUIT

NO. 1

PSIG

CIRCUIT

NO. 2

[] VERIFY

REFRIGERANT

CHARGE

USING CHARGING

PSIG
PSIG

CHART ON PAGE 37.

GENERAL
[] ECONOMIZER
[] VERIFY

MINIMUM

INSTALLATION

VENT AND CHANGEOVER
OF ALL OPTIONS

SETTINGS

TO JOB REQUIREMENTS

AND ACCESSORIES

Copyright 2006 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications
Book

1 14

Tab

1b 16b

Catalog No, 04-53500012-01

Printed in U.S,A.

or designs without notice and without incurring obligations.

Form 50HJ-29SI

Pg CL-1

3-06

Replaces:

50HJ-25SI

Source Exif Data:

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Linearized                      : No
Page Count                      : 48
Page Layout                     : SinglePage
Page Mode                       : UseNone
Producer                        : Goby Monitor Application version 3, 2, 1, 4
Create Date                     : Fri Apr 20 14:40:42 2007
Author                          : 
Title                           : 
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CARRIER Package Units(both Units Combined) Manual L0606344

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