Carrier 90Ma Mf Mu Users Manual

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Models
90MA/MF/MU, Design Series Two
Beginning Serial Number C00400

62--10458--00

INSTALLATION
OPERATION & SERVICE

Marine/Industrial
Single Package
Cooling Unit

OPERATION AND SERVICE MANUAL
MARINE/INDUSTRIAL SINGLE PACKAGE
COOLING UNIT

MODELS
90MA/MF/MU, Design Series Two
Beginning Serial Number C00400

Carrier Refrigeration Operations, A member of the United Technologies Corporation family. Stock symbol UTX.
Carrier Transicold, Carrier Corporation, P.O. Box 4805, Syracuse, N.Y. 13221 U. S. A.
Carrier Corporation 2000 D Printed in U. S. A. 0700

SAFETY SUMMARY
GENERAL SAFETY NOTICES

The following general safety notices supplement the specific warnings and cautions appearing elsewhere in this
manual. They are recommended precautions that must be understood and applied during operation and maintenance
of the equipment covered herein. The general safety notices are presented in the following three sections labeled: First
Aid, Operating Precautions and Maintenance Precautions. A listing of the specific warnings and cautions appearing
elsewhere in the manual follows the general safety notices.
FIRST AID

An injury, no matter how slight, should never go unattended. Always obtain first aid or medical attention immediately.
OPERATING PRECAUTIONS

Always wear safety glasses.
Keep hands, clothing and tools clear of the evaporator and condenser fans.
No work should be performed on the unit until all circuit breakers, start-stop switches are turned off, and power supply
is disconnected.
Always work in pairs. Never work on the equipment alone.
In case of severe vibration or unusual noise, stop the unit and investigate.
MAINTENANCE PRECAUTIONS

Beware of unannounced starting of the evaporator fan. Do not open the evaporator access panels before turning power
off, disconnecting and securing the power source.
Be sure power is turned off before working on motors, controls, solenoid valves and electrical control switches. Tag
circuit breaker and power supply to prevent accidental energizing of circuit.
Do not bypass any electrical safety devices, e.g. bridging an overload, or using any sort of jumper wires. Problems
with the system should be diagnosed, and any necessary repairs performed, by qualified service personnel.
In case of electrical fire, open circuit switch and extinguish with CO2 (never use water).
SPECIFIC WARNING AND CAUTION STATEMENTS

To help identify the label hazards on the unit and explain the level of awareness each one carries, an explanation is
given with the appropriate consequences:
WARNING -- means to warn against hazards or unsafe conditions which could result in severe personal injury or
death.
CAUTION -- means to warn against potential hazard or unsafe practice which could result in product or property
damage.
The statements listed below are applicable to the unit and appear elsewhere in this manual. These recommended
precautions must be understood and applied during operation and maintenance of the equipment covered herein.
WARNING
Never reach into unit while fan is running. Lock open and tag unit disconnect before working on fan.
Remove fuses and take them with you after noting this on tag.
WARNING
Follow all Safety codes. Wear safety glasses and rubber gloves when using inhibited hydrochloric acid
solution.
WARNING
Lock open and tag unit disconnect before working on fan motor. Remove fuses and take them with you
after noting this on tag.
CAUTION
Compressor crankcase heater must be energized for 24 hours prior to start up to prevent compressor
bearing damage.
Safety-1

62--10458--00

CAUTION
Sharp edges of coil fins are exposed. To prevent injury, cover top of evaporator with cardboard or a few
layers of heavy tape.
CAUTION
To avoid coil damage, cover evaporator face with plywood or other rigid sheet material. If any coil fins
are mashed or bent, straighten with a coil fin comb of the proper tooth spacing (refer to “coil fins/inch”
in Table 1 through Table 2). Check for refrigerant leaks.
CAUTION
Before attempting to remove fan motors or motor mounts, place a piece of plywood over evaporator
coils to prevent coil damage.

62--10458--00

Safety-2

TABLE OF CONTENTS
PARAGRAPH NUMBER

Page

GENERAL SAFETY NOTICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety-1
FIRST AID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety-1
OPERATING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety-1
MAINTENANCE PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety-1
SPECIFIC WARNING AND CAUTION STATEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety-1
1.
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
2.
MODEL CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
3.
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
3.1
Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
3.2
Protect Unit from Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
3.3
Provide Unit Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
3.4
Install Accessory Heating Coil (if applicable) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
3.5
Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
3.6
Install Accessory Plenum (If Supplied) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
3.7
Install Ventilation--Air Ductwork (If required) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
3.8
Install Return Air Ductwork (If required) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
3.9
Check Return--Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
3.10 Align Fan Shaft and Wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
3.11 Check Compressor Spring Mounts (008 & 012 size only) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
3.12 Make Condenser Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
3.13 Install Condensate Drain Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
3.14 Make Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
4.
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
4.1
To Start Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
4.2
To Shut Down Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
4.3
Sequence Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
5.
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
5.1
Return--Air Grille Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
5.2
Access Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
5.3
Evaporator Fan Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
5.4
Return--Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
5.5
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
5.6
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
5.7
Water Regulating Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
5.8
Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
5.9
Refrigerant Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
5.10 Evaporator Fan Motor Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
5.11 Pressure Relief Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
5.12 Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
5.13 Cycle--LocTM -- Protection Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
5.14 Discharge and Suction Pressure Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
5.15 Oil Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
i

62--10458--00

LIST OF ILLUSTRATIONS
FIGURE NUMBER

Page

Figure 1 Base Unit Interior Details (Typical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2 Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3 Horizontal Wheel Centering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4 Concentric Wheel Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 5 Connection Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 6 Typical Condenser Water Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 7 Condensate Drain Trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 8 Fan Pulley Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 9 Gravity Flow Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 10 Forced Circulation Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 11 Charging Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 12 Mounting Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 13 Wiring Schematic -- 90MA/MF/MU004/006 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 14 Component Arrangement -- 90MA/MF/MU004/006 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 15 Wiring Schematic -- 90MA/MF/MU008/012 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 16 Component Arrangement -- 90MA/MF/MU008/012 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1
5
5
5
6
6
7
9
10
11
11
13
14
15
16
17

LIST OF TABLES
TABLE NUMBER

Page

Table 1 90MA/MF/MU Physical Data -- Refrigerant 22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 2 90MA/MF/MU Physical Data -- Refrigerant 407C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3 90MA/MF Physical Data -- Refrigerant 134a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 4 Recommended Line Sizes, Remote Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

62--10458--00

ii

2
3
4
7

3.1

1. INTRODUCTION

Inspect Unit

The 90M series single--package cooling units (See
Figure 1) are designed to provide air conditioning
aboard marine vessels and in industrial applications.
The 90MA units are fitted with sea water cooled
condensers while the 90MF units are fitted with fresh
water cooled condensers. Both units are factory
charged, wired and piped. The 90MU units are similar
except they are configured for use with a remote
mounted condenser.

Check unit against shipping order. Inspect carefully for
concealed shipping damage. If shipment is damaged or
incomplete, file claim with transportation company and
advise Carrier Transicold immediately.

An accessory discharge plenum may be installed to
provide free--blow into the conditioned space. Also, an
accessory electric, hot water or steam coil heater may be
installed to provide comfort heating.

Refer to Figure 2 and Table 1 through Table 2 for unit
size and weight. If desired, construct a frame of I--beams
or angle iron that adequately supports unit. See
Figure 12.

3.2

Protect Unit from Damage

To maintain warranty, protect unit against adverse
weather, theft, or vandalism on job site.
3.3

3.4

Provide Unit Support

Install Accessory Heating Coil (if applicable)

Electric heaters are installed at the top of the unit. Water
or steam coil must be installed through the back of the
unit as described in the Installation Instructions shipped
with the accessory coil.
3.5

Rig and Place Unit

NOTE
Install accessories before placing unit.
a. Provide space around unit for service, filter access,
and overhead clearance as indicated in Figure 2.
b. Move and store unit in upright position.
c. Use slings with spacer under base skid to prevent panel damage when using hoist.
d. Units as shipped are adequately dampened against
vibration. If additional dampening is desired, place
sponge rubber or rubber mat, between deck and base
of unit or install vibration isolators.
e. Unit should be level. Unit leveling tolerance is 1/8
inch per linear foot in any direction.

(90MA/MF
ONLY)

Figure 1 Base Unit Interior Details (Typical)
2.

MODEL CHART

This manual covers 90M design series two units as
shown in the following model chart.
1

2

3

4

5

6

7

8

9

10 11

9

0

M

A

3

1

2

---

6

2

3.6

Use plenum as template to mark hole locations in top
panel. Drill 5/32--in. (0.4 cm) holes in top panel at
marked locations and attach plenum with screws
supplied.

1

3.7
PRODUCT
CODE
MA
MF
MU

MODEL
- 90/10 Copper Nickel
Condenser
- Copper Condenser
- Condenserless

2 - R-22
3 - R-134a
4 - R-407C
NOMINAL COOLING
CAPACITY (R--22)

3.

Install Accessory Plenum (If Supplied)

Install Ventilation--Air Ductwork
(If required)

Connect ventilation ducts to flanges on outside--air
supply opening (See Figure 2) using a flexible
connection. Attach ductwork to ship structure and
insulate with fiberglass and vapor barrier to reduce
sound transmission and prevent vapor condensation.
Weatherproof external ductwork, joints, and openings
in accordance with applicable codes. Ducts passing
through an unconditioned space must be insulated and
covered with a vapor barrier.

VOLTAGE
5 - 208/230-3-60
6 - 460-3-60
9 - 400-3-50
DESIGN
SERIES
PACKAGING

3.8

Install Return Air Ductwork (If required)

The unit back panel is to be field cut for alternate
return--air (or outdoor--air inlet) opening as indicated in
Figure 2. To install ductwork:
a. Cut out the alternate return--air opening as required.

INSTALLATION

To install the unit, do the following:
1

62--10458--00

Table 1 90MA/MF/MU Physical Data -- Refrigerant 22
R--22 -- English Units
BASE UNIT 90MA/MF/MU

UNITS

NOMINAL CAPACITY
OPERATING WEIGHT
Base Unit -- 90MA/MF
Base Unit -- 90MU
Discharge Plenum
COMPRESSOR TYPE

LEGEND
FPT = Female Pipe Thread

English (Metric)

204

206

208

212

204

206

208

212

Tons (kW)

3

5

7.5

10

10.5

17.6

26.4

35.1

Pounds (kg)
Pounds (kg)
Pounds (kg)

Quantity of Cylinders
Quantity of Unloading Cylinders
Quantity of Capacity Steps
DISCHARGE PRESSURE SWITCH
Opens -- 90MA/MF
Closes -- 90MA/MF
Opens -- 90MU
Closes -- 90MU
SUCTION PRESSURE SWITCH
Opens
Closes
OPERATING CHARGE -- 90MA/MF
CONDENSER -- 90MA/MF
Number & Type
Water Volume
EVAPORATOR AIR FAN
Nominal Flow
Standard Speed Range
Maximum Allowable RPM
Belt Quantity / Pulley Pitch Diameter
Motor Pulley Pitch Diameter Range
Motor Nominal Rating(@60 Hz)...Frame Size
Standard
Alternate (See Note 1)
Alternate (See Note 1)
EVAPORATOR COIL
Tube Type
Quantity of Rows...fin Spacing
Face Area
RETURN AIR FILTERS
Quantity...Size
CONDENSER CONNECTIONS
Water Inlet (bottom) & Outlet (top)
Maximum Working Pressure (refrigerant side)
CONDENSATE DRAIN CONNECTIONS
ACCESSORY HEATING COILS
HOT WATER
Quantity of Rows...fin spacing
Face Area
Water Inlet (top) & Outlet Connection (bottom)
STEAM
Quantity of Rows...fin spacing
Face Area
Water Inlet (top) & Outlet Connection (bottom)

R--22 -- Metric Units

390
427
330
360
25
25
Welded Hermetic
Scroll
----

895
950
835
890
50
50
Semi--Hermetic
Reciprocating

----

4
0
1

177
194
150
163
11.3
11.3
Welded Hermetic
Scroll

6
2
2

----

406
431
379
404
22.7
22.7
Semi--Hermetic
Reciprocating

----

4
0
1

psig (kPa)
psig (kPa)
psig (kPa)
psig (kPa)

395
10
295
20
426
7
320
20

2725
69
2034
138
2937
48
2206
138

psig (kPa)
psig (kPa)
pounds (kg)

27
4
67
7

186
28
462
48
2.4
5.1

gallon (liter)
cfm (m3/h)
RPM

3.1

5.3

525-750

horse power
horse power
horse power

1/3...56
3/4...56
----

inches FPT
psig (kPa)
inches FPT

1.4

4.5

1....Tube In Tube
0.86
2.42
1.48
3.3
9.2
Adjustable, Belt Driven Centrifugal: 1750 RPM Motor @ 60 Hz
1200
2000
3000
4000
1698
2830
4245
5660

1 / 8.0

inches (cm)

10

0.39

inches (cm)
inches (cm)

fins/inch(cm)
sq ft (sq m)

11.2

6
2
2

647-915

495-700

1 / 6.4
1 / 8.5
2.4 to 3.4

600-850

427-652

1050
1 / 7.0 1 / 20.3

593-762

412-583

500-708

1 / 16.3 1 / 21.6
6.1 to 8.6

1 / 17.8

3/4...56 1...56
2...56 .25 / 56 .56 / 56 .75 / 56 1.5 / 56
1...56
2...56
3...56 .56 / 56 .75 / 56 1.5 / 56 2.2 / 56
---3...56
---------2.2 / 56
---3/8 (.95 cm) OD, Copper Tubes, Aluminum Fins
Prime
2...14.4 3...14.4
3...12.5
2...5.7
3...5.7
3...4.9
5
5
7.3
8.5
0.46
0.46
0.68
0.79
Factory Supplied, Cleanable
2...16 x 25 x 1
4...16 x 20 x 1
2...40.6x63.5x2.5 4...40.6x50.8x2.5
1/2

3/4

1

1

1/2

3/4

400
3/4

1

1

2758
3/4

fins/inch(cm)
sq ft (m)
inches (cm)

1...15
1...15
5
5
7/8 ODF

2...14
2...14
6
6
1--1/4 MPT

1...5.9
1...5.9
0.46
0.46
7/8 ODF

2...5.5
2...5.5
0.56
0.56
1--1/4 MPT

fins/inch(cm)
sq ft (m)
inches (cm)

See Note 2
See Note 2
See Note 2

1...14
1...14
6.9
6.9
1--1/4 MPT

See Note 2
See Note 2
See Note 2

1...5.5
1...5.5
0.64
0.64
1--1/4 MPT

MPT = Male Pipe Thread

ODF = Outside Diameter Female

NOTES:
1. Motors and drives other than those furnished with unit must be purchased separately. Contact your Carrier Transicold representative.
2. Accessory heating coil in 004 and 006 units is combination hot water/steam. See hot water data.

62--10458--00

2

Table 2 90MA/MF/MU Physical Data -- Refrigerant 407C
R--407C -- English Units
BASE UNIT 90MA/MF/MU

UNITS

NOMINAL CAPACITY
OPERATING WEIGHT
Base Unit -- 90MA/MF
Base Unit -- 90MU
Discharge Plenum
COMPRESSOR TYPE

LEGEND
FPT = Female Pipe Thread

English (Metric)

404

406

408

412

404

406

408

412

Tons (kW)

3

5

7.5

10

10.5

17.6

26.4

35.1

Pounds (kg)
Pounds (kg)
Pounds (kg)

Quantity of Cylinders
Quantity of Unloading Cylinders
Quantity of Capacity Steps
DISCHARGE PRESSURE SWITCH
Opens -- 90MA/MF
Closes -- 90MA/MF
Opens -- 90MU
Closes -- 90MU
SUCTION PRESSURE SWITCH
Opens
Closes
OPERATING CHARGE -- 90MA/MF
CONDENSER -- 90MA/MF
Number & Type
Water Volume
EVAPORATOR AIR FAN
Nominal Flow
Standard Speed Range
Maximum Allowable RPM
Belt Quantity / Pulley Pitch Diameter
Motor Pulley Pitch Diameter Range
Motor Nominal Rating(@60 Hz)...Frame Size
Standard
Alternate (See Note 1)
Alternate (See Note 1)
EVAPORATOR COIL
Tube Type
Quantity of Rows...fin Spacing
Face Area
RETURN AIR FILTERS
Quantity...Size
CONDENSER CONNECTIONS
Water Inlet (bottom) & Outlet (top)
Maximum Working Pressure (refrigerant side)
CONDENSATE DRAIN CONNECTIONS
ACCESSORY HEATING COILS
HOT WATER
Quantity of Rows...fin spacing
Face Area
Water Inlet (top) & Outlet Connection (bottom)
STEAM
Quantity of Rows...fin spacing
Face Area
Water Inlet (top) & Outlet Connection (bottom)

R--407C -- Metric Units

390
427
330
360
25
25
Welded Hermetic
Scroll
----

895
950
835
890
50
50
Semi--Hermetic
Reciprocating

----

4
0
1

177
194
150
163
11.3
11.3
Welded Hermetic
Scroll

6
2
2

----

406
431
379
404
22.7
22.7
Semi--Hermetic
Reciprocating

----

4
0
1

psig (kPa)
psig (kPa)
psig (kPa)
psig (kPa)

395
10
295
20
426
7
320
20

2725
69
2034
138
2937
48
2206
138

psig (kPa)
psig (kPa)
pounds (kg)

27
4
67
7

186
28
462
48
2.4
5.1

gallon (liter)
cfm (m3/h)
RPM

3.1

5.3

11.2

525-750

647-915

495-700

1 / 6.4
1 / 8.5
2.4 to 3.4

horse power
horse power
horse power

1/3...56
3/4...56
----

3/4...56
1...56
----

1/2

3/4

inches FPT
psig (kPa)
inches FPT

4.5

1....Tube In Tube
0.86
2.42
1.48
3.3
9.2
Adjustable, Belt Driven Centrifugal: 1750 RPM Motor @ 60 Hz
1200
2000
3000
4000
1698
2830
4245
5660

1 / 8.0

inches (cm)

1.4

0.39

inches (cm)
inches (cm)

fins/inch(cm)
sq ft (sq m)

10.0

6
2
2

600-850

427-652

1050
1 / 7.0 1 / 20.3

593-762

412-583

500-708

1 / 16.3 1 / 21.6
6.1 to 8.6

1 / 17.8

1...56
2...56 .25 / 56 .56 / 56 .75 / 56 1.5 / 56
2...56
3...56 .56 / 56 .75 / 56 1.5 / 56 2.2 / 56
3...56
---------2.2 / 56
---3/8 OD, Copper Tubes, Aluminum Fins
Prime
Prime
2...14.4 3...14.4
3...12.5
2...5.7
3...5.7
3...4.9
5
5
7.3
8.5
0.46
0.46
0.68
0.79
Factory Supplied, Cleanable
Factory Supplied, Cleanable
2...16 x 25 x 1
4...16 x 20 x 1
2...40.6x63.5x2.5 4...40.6x50.8x2.5
1

1

1/2

3/4

400
3/4

1

1

2758
3/4

fins/inch(cm)
sq ft (m)
inches (cm)

1...15
1...15
5
5
7/8 ODF

2...14
2...14
6
6
1--1/4 MPT

1...5.9
1...5.9
0.46
0.46
7/8 ODF

2...5.5
2...5.5
0.56
0.56
1--1/4 MPT

fins/inch(cm)
sq ft (m)
inches (cm)

See Note 2
See Note 2
See Note 2

1...14
1...14
6.9
6.9
1--1/4 MPT

See Note 2
See Note 2
See Note 2

1...5.5
1...5.5
0.64
0.64
1--1/4 MPT

MPT = Male Pipe Thread

ODF = Outside Diameter Female

NOTES:
1. Motors and drives other than those furnished with unit must be purchased separately. Contact your Carrier Transicold representative.
2. Accessory heating coil in 004 and 006 units is combination hot water/steam. See hot water data.

3

62--10458--00

Table 3 90MA/MF Physical Data -- Refrigerant 134a
R--134a -- English Units
BASE UNIT 90MA/MF

LEGEND
FPT = Female Pipe Thread

308

312

308

312

Tons (kW)

5.5

8

19.3

28.1

Pounds (kg)
Pounds (kg)

895
50

950
50

English (Metric)

NOMINAL CAPACITY
OPERATING WEIGHT
Base Unit
Discharge Plenum
COMPRESSOR TYPE -- Reciprocating
Quantity of Cylinders
Quantity of Unloading Cylinders
Quantity of Capacity Steps
DISCHARGE PRESSURE SWITCH
Opens
Closes
SUCTION PRESSURE SWITCH
Opens
Closes
OPERATING CHARGE
CONDENSER
Number & Type
Water Volume
EVAPORATOR AIR FAN
Nominal Flow
Standard Speed Range
Maximum Allowable RPM
Belt Quantity / Pulley Pitch Diameter
Motor Pulley Pitch Diameter Range
Motor Nominal Rating(@60 Hz)...Frame Size
Standard
Alternate (See Note 1)
Alternate (See Note 1)
EVAPORATOR COIL
Tube Type
Quantity of Rows...fin Spacing
Face Area
RETURN AIR FILTERS
Quantity...Size
CONDENSER CONNECTIONS
Water Inlet (bottom) & Outlet (top)
Maximum Working Pressure (refrigerant side)
CONDENSATE DRAIN CONNECTIONS
ACCESSORY HEATING COILS
HOT WATER
Quantity of Rows...fin spacing
Face Area
Water Inlet (top) & Outlet Connection (bottom)
STEAM
Quantity of Rows...fin spacing
Face Area
Water Inlet (top) & Outlet Connection (bottom)

R--134a -- Metric Units

UNITS

Semi--Hermetic
4
0
1

6
2
2

406
431
22.7
22.7
Semi--Hermetic
4
6
0
2
1
2

psig (kPa)
psig (kPa)

335
10
235
20

2310
69
1620
138

psig (kPa)
psig (kPa)
pounds (kg)

7
3
22
5

48
21
152
35

gallon (liter)
cfm (m3/h)
RPM
inches (cm)
inches (cm)
horse power
horse power
horse power

fins/inch(cm)
sq ft (sq m)
inches (cm)

11.2

5.1

4.5

1....Tube In Tube
1....Tube In Tube
2.42
9.2
Adjustable, Belt Driven Centrifugal: 1750 RPM Motor @ 60 Hz
3000
4000
4245
5660
495--700
600--850
412--583
500--708
1050
1 / 8.5
1 / 7.0
1 / 21.6
1 / 17.8
2.4 to 3.4
6.1 to 8.6
1...56
2...56
3...56

2...56
.75 / 56
1.5 / 56
3...56
1.5 / 56
2.2 / 56
---2.2 / 56
---3/8 OD(0.95) cm, Copper Tubes, Aluminum Fins
Prime
3...12.5
3...14.9
7.3
8.5
0.68
0.79
Factory Supplied, Cleanable
4...16 x 20 x 1
4...40.6 x 50.8 x 2.5

inches FPT
psig (kPa)
inches FPT

1

fins/inch(cm)
sq ft (m)
inches (cm)

2...14
6

fins/inch(cm)
sq ft (m)
inches (cm)

1...14
6.9

MPT = Male Pipe Thread

10

1

1

400
3/4

1
2758
3/4

2...14
6

2...5.5
0.56

1--1/4 MPT

2...5.5
0.56
1--1/4 MPT

1...14
6.9
1--1/4 MPT

1...5.5
0.64

1...5.5
0.64
1--1/4 MPT

ODF = Outside Diameter Female

NOTES:
1. Motors and drives other than those furnished with unit must be purchased separately. Contact your Carrier Transicold representative.

62--10458--00

4

UNIT
A
B
C
D
E
F
G
H
J
K
L
M
N
P
Q
R

004

006

36.19(919)
21.88(556)
59.12(1501)
SEE NOTE 2
24(610)
13.81(351)
16.44(418)
13.13(333)
15(381)
0.75(19)
0.75(19)
12.5(318)
10.62(270)
17.06(433)
20.50(521)
17(432)
31.88(810)
2.06(52)
10(254)
15.56(395)

008,012
48(1219)
29.62(752)
69.50(1765)

19.38(492)
17.25(438)
1.31(33)
11.44(291)
23.25(591)
25.37(644)
17(432)
42.62(1083)
3(76)
12.50(318)
16(406)

NOTES:
1.

Certified dimension drawings available upon request

2. Minimum required clearance at back of unit is zero.
Clearance above and at right (90MA008,012 only) and at left of
unit depends on space required for accessory plenum,
ductwork, condenser piping, accessory heater piping,
condensate drain line and power wiring
3. Water connections are located on left side of unit (Refer to
“Make Condenser Connections”, Condensate drain
connections are located on left side of unit for 004 & 006, and
on both sides of unit for 008 & 012.

Figure 2 Unit Dimensions
3.10

b. Attach a one--inch (2.5 cm) flange or attach a flanged,
flexible duct connection directly to unit.

horizontally centered between the inside edges of their
fan scroll ventures (Figure 3). Adjust as follows:
a. Loosen set screws holding wheel to shaft.
b. Center the wheel by sliding it horizontally.
c. Re--tighten set screws.
CONCENTRIC ALIGNMENT -- Shaft and wheels must be
concentrically centered with the venturi (Figure 4).
Shaft bearings are supported by bearing supports. If
shaft and wheels are concentrically misaligned from
shipping shock, it is possible to re--bend bearing support
arms to original positions. Replace the bearing support
if it has been extensively damaged during shipping.

If an outdoor makeup air damper is to be installed, attach it directly to unit back panel and install flexible
connection between damper and remaining ductwork. Use accepted ductwork installation procedures. Follow all applicable codes.
c. Completely blank off the standard return--air opening
with a field--fabricated filler panel. The panel must be
removable for service access. Refer to paragraph 5.1.
3.9

Align Fan Shaft and Wheel

HORIZONTAL WHEEL CENTERING -- All wheels must be

Check Return--Air Filters

Ensure filters shipped with unit are in place. Never
operate unit without return air filters in place.

DIMENSION “D” MUST BE EQUAL ALL AROUND

Figure 3 Horizontal Wheel Centering

Figure 4 Concentric Wheel Alignment
5

62--10458--00

90MA/MU008/012 UNITS

90MA/MF004/006 UNITS

90MU008/012 UNITS

90MU004/006 UNITS

UNIT
90MA/MF004
90MA/MF006
90MA/MF008/012
90MU004
90MU006
90MU008/012

A*
1/2
3/4
1”
----------

B*
1/2
---1”
----------

C*
---3/4
-------------

D*
¾ FPT

E
---------1/2 flare
1/2 flare
5/8 O.D.

F
---------1/2 flare
1/2 flare
3/4 O.D.

G
1.75
(45)

* A = Condenser In, B & C = Condenser Out, D = Condensate, all Female Pipe Thread, E = Liquid Refrigerant (field cut), F =
Refrigerant Discharge (field cut), G = Electrical Opening
3.11

Figure 5 Connection Locations
Check Compressor Spring Mounts
Install water--regulating valve in water supply line
(008 & 012 size only)
outside cabinet as follows.

The compressors are held rigid in shipment by bolts
extending through a washer, grommet and compressor
foot into a weld nut. Loosen each bolt (4 per
compressor) until compressor floats freely on springs.
Then re--tighten bolts until there is slight pressure on the
neoprene gasket. This will steady the compressor and
prevent start and stop rocking.

See Figure 5

The compressors have reversible oil pumps that operate
in either direction; therefore, the direction of rotation
need not be checked.
3.12

Make Condenser Connections

-- Condenser
water inlet and outlet connections are shown in
Figure 5. Piping arrangements for condenser cooling
water are shown in Figure 6.

UNIT MOUNTED CONDENSER (90MA/MF)

Figure 6 Typical Condenser Water Piping

a. Route regulating valve capillary with its flare nut to
the port on refrigerant discharge line (Figure 1), using any convenient unused opening on side of unit.
Use a grommet in panel to prevent chafing of capillary.
b. Remove cap from discharge line fitting.
c. Remove cotter pin taped to discharge line fitting. Insert pin, split end first, into regulating valve flare.

Connect condenser water supply and return lines as
indicated. When connecting water lines, hold the
condenser inlet and outlet stubs firmly with a wrench at
the female pipe thread hex fitting to prevent twisting.
Do not use water lines smaller than connection sizes
shown in Figure 5. Observe all applicable plumbing and
sanitary codes.
62--10458--00

6

UNIT
((90MU))

004
006
008
012

Table 4 Recommended Line Sizes, Remote Condenser
LENGTH OF RUN
0--25
26--50
51--75
DISCH
LIQUID
DISCH
LIQUID
DISCH
LIQUID

1/2 (1.3)
5/8(1.6)
7/8(2.2)
7/8(2.2)

1/2(1.3)
1/2(1.3)
5/8(1.6)
5/8(1.6)

5/8(1.6)
7/8(2.2)
7/8(2.2)
1-1/8(2.9)

1/2(1.3)
1/2(1.3)
5/8(1.6)
5/8(1.6)

5/8(1.6)
7/8(2.2)
7/8(2.2)
1-1/8(2.9)

1/2(1.3)
1/2(1.3)
5/8(1.6)
5/8(1.6)

76--100
DISCH
LIQUID

7/8(2.2)
7/8(2.2)
1-1/8(2.9)
1-1/8(2.9)

1/2(1.3)
1/2(1.3)
5/8(1.6)
5/8(1.6)

NOTES:
1. Line sizes given in inches (cm).
2. Line sizes should never be smaller than cooling unit connection size.
3. A nominal number of fittings has been considered in determining line sizes. Smaller line sizes may be considered
if run is simple and few fittings are used.
d. Hold flare tightly against fitting while connecting
flare nut. Round end of cotter pin will depress core of
fitting. The opened fitting allows refrigerant pressure
to act on water regulating valve. Tighten nut to prevent leakage. Fitting automatically seals when nut is
removed.
REMOTE MOUNTED CONDENSER (90MU) -- Install
remote mounted condenser in accordance with the
installation instructions provided with condenser.
Connection locations for liquid and discharge lines are
shown in Figure 5. Recommended line sizes are given
in Table 4. Additional instructions can be found in
Carrier System Design Manual, Part 3, for standard
refrigeration piping techniques. On 008 and 012 size
units, secure discharge line to bracket at unit outlet
using proper clamp from supplied fastener package

Condenserless (90MU) units are shipped with a
refrigerant holding charge. After refrigerant
connections are made, leak test, reclaim refrigerant,
evacuate, and charge system as described in paragraph
5.9.
3.13

Figure 7 Condensate Drain Trap

Do not use drain line smaller than 3/4 inch. Use hole(s)
provided in panel for drain line. Pitch drain line
downward toward scupper. Installation of a plugged tee
is recommended for cleaning. Fill trap with water to
make an air seal. Observe all sanitary requirements.

Install Condensate Drain Line

Install a trapped condensate drain line at unit drain
connection. The drain requires standard pipe connected
to condensate pan nipple(s). Figure 7 shows proper trap
design.

3.14

Make Electrical Connections

Provide an adequate fused disconnect
switch within sight of the unit. Provision for locking
switch open (OFF) is advisable to prevent power from
being turned on when unit is being serviced.

GENERAL --

Determine design negative static pressure. This
pressure is not the same as fan total static pressure,
which includes pressure losses downstream as well as
upstream from the evaporator air fan. Always assume
the worst conditions, such as having return air filters
clogged with debris.

POWER WIRING -- Conduit opening for all units is on left
side of unit near control box. Connect field power wires
at the compressor contactor.

Supply voltage must be in accordance with nameplate
voltage. Voltage between phases must be balanced
within 2% and current within 10% with compressor
running. Correct improper voltage or phase imbalance.
Unit failure as a result of operation on improper line
voltage or excessive phase imbalance constitutes abuse
and shall void the Carrier warranty. Use the following
formula to determine the percent voltage imbalance.

Referring to Figure 7, differential 1 must be equal to or
larger than negative static pressure at design operating
condition. Store enough water in trap to prevent losing
seal. Differential 2 must be equal to or larger than
one--half the maximum negative static pressure. To
avoid loss of seal when the fan starts, differential 3 must
be greater than the maximum negative static pressure.
7

62--10458--00

e. Allow crankcase heater to remain energized (unit
power on) for at least 24 hours. Open any valves in
condenser cooling water supply lines and then set selector switch at COOL position. If room temperature
is above thermostat setting compressor will start. On
first start--up, set water regulating valve. (Refer to
paragraph5.7.)
f. Set thermostat for comfort as desired.
4.2

CONTROL WIRING -- On extended voltage (208/230--v)
units, the control transformer is factory wired for 208--v
usage. If unit is to be used on 230--v system, reconnect
primary wiring on transformer. See Figure 13 (004/006
size) or Figure 15 (008/012 size).

4.3

OPERATION

CAUTION
Compressor crankcase heater must be energized for 24 hours prior to start up to prevent
compressor bearing damage.
4.1

To Start Unit

a. Thoroughly inspect exterior of unit. Clean and dust
up debris, then wash with mild soap and water solution.
b. On 008 & 012 size units, ensure compressor discharge, suction and liquid service valves are open.
The valves are accessible from the front of the unit.
To open valve, turn counterclockwise. After opening,
replace and tighten valve cap to prevent leakage.
Check oil level in compressor sight glass. If level is
below glass, add oil to bring level to approximately
1/4 glass. If level is above bottom of glass, do not remove any oil until the crankcase heater has been energized for at least twenty--four hours.
c. With selector switch in OFF position, turn main power on. Leave power on for 24 hours so that crankcase
heater can drive off accumulated refrigerant.
d. If desired, the selector switch may be placed in the
FAN position during the crankcase warm--up period.
On first start--up, check fan speed (Table 1 through
Table 2) and rotation (Figure 1). If fan requires adjustment, refer to paragraph 5.3.
62--10458--00

Sequence Of Operation

Unit operation is dependent on the position of the mode
selector switch. (See note 3, Figure 14 or Figure 16.)
Operation sequence for each switch position is provided
in the following paragraphs.
OFF POSITION: With correct voltage supplied at the
field power supply terminals, see Figure 13 or Figure 15
power flows through normally closed crankcase heater
relay (CHR) contacts (CHR, 4/5) to energize the
crankcase heater (CH).
TO PLACE THE UNIT IN THE FAN MODE: The
switch (SW) is placed in the FAN position to supply 24
volt control power, to energize indoor fan contactor
(IFC). Energizing IFC closes contacts (IFC, 11/21,
12/22 & 13/23) to energize the motor. Operation of the
crankcase heater is maintained.
TO PLACE THE UNIT IN THE COOL MODE: The
switch (SW) is placed in the COOL position. With
thermostat (T--LOW) calling for cooling (closed to
contacts R & W) control power flows from TRAN
through T--LOW, SW and compressor lockout (CL)
normally closed contacts to the discharge pressure
switch (DPS). On 008/012 size units, flow continues
through the compressor internal protector (IPC),
compressor overloads (OLA & OLB) and the suction
pressure switch (SPS), to energize CHR. On 004/006
size units, flow continues directly thorough the suction
pressure switch to energize CHR.
Energizing CHR opens contacts CHR 4--5 to
de--energize CH and closes contacts CHR 1--3 and
energize the compressor contactor (CC). Energizing CC
closes its contacts to start the compressor motor (C).
Operation of the indoor fan motor (IFM) is maintained.
On 90MU units, power also flows from terminal TB1--5
to energize condenser fan relay (CFR). Energizing CFR
closes its contacts to supply power to the field supplied
condenser fan relay.
012 size units are fitted with a two stage cooling system.
On these units, if thermostat switch T--HIGH is also
calling for cooling, power flows through thermostat

On all units, the thermostat is factory installed. A
sensing element is provided in the return air. To wire
these units to a remote thermostat, or to a remote control
switch and thermostat, refer to unit Wiring Diagram or
contact your Carrier Transicold representative.
4.

To Shut Down Unit

a. Turn selector switch to OFF position. Do not shut off
main power except to service unit. The crankcase
heater is operative only when main power is on. (Refer to paragraph 5.12).
b. If unit is to be used for winter heating, set selector
switch at HEAT position and re--set thermostat at desired setting.
c. If unit may be exposed to freezing temperatures, drain
water from condenser and water piping. Add a noncorrosive antifreeze to residual water in system.

8

switch T--HIGH to energize liquid line solenoid (LLS)
[to activate the full evaporator coil and all compressor
cylinders]. If thermostat switch T--HIGH is not calling
for cooling, power flows to energize compressor
unloader solenoid (US) [to unload compressor
cylinders].

5.2

When room temperature falls to the cutout point of
T--LOW, switch T--LOW opens to de--energize CHR,
stopping the compressor motor and energizing CH. The
machine enters a stand--by state, ready to restart
automatically on room thermostat call for cooling.

5.3

a. Remove return--air grille as described above.
b. Remove the panel fastening screws now exposed.
c. Pull out and down to remove top panel.
d. Pull out and up to remove bottom panel.
Evaporator Fan Adjustment

WARNING
Never reach into unit while fan is running.
Lock open and tag unit disconnect before
working on fan. Remove fuses and take them
with you after noting this on tag.

If any safety device opens (CLO, SPS, DPS, IP, OLA or,
OLB) relay CHR is de--energized, stopping the
compressor motor and energizing the crankcase heater.

SPEED ADJUSTMENT -- The fan motor pulleys are
factory set at the fan speeds listed in Table 1, Table 3 or
Table 2. to change fan speed, do the following:
a. Shut off unit power supply.
b. Loosen fan belt by loosening fan motor from mounting bracket. Do not loosen fan motor mounting bracket from unit.
c. Loosen movable pulley flange set screw (Figure 8).
d. Screw movable flange toward fixed flange to increase
fan speed and away from fixed flange to decrease
speed. Increasing fan speed increases load on motor.
Do not exceed maximum allowable fan speed or motor full load amps indicated on motor nameplate.
e. Set movable flange set screw at nearest flat of pulley
hub and tighten set screw.
f. Check pulley alignment and belt tension adjustment
as described below.
g. Check fan operation. Repeat above procedure as required.

TO PLACE THE UNIT IN THE HEAT MODE: The
switch (SW) is placed in the HEAT position. With
thermostat (T--LOW) calling for heating (closed to
contacts R & B), 24 volt control power flows through
manual reset temperature cutout MC to energize safety
relay H2. Power also flows through air flow switch (AS)
and automatic cutout (AC) to energize operating relay
(H1). Energizing relays H1 and H2 closes contacts to
energize the heaters.
Placing SW in the FAN position de--energizes all
cooling or heating control circuits in the same manner as
activation of a safety switch. Placing SW in the OFF
position also de--energizes IFC to stop the indoor fan
motor.

5.

Access Panel Removal

SERVICE

WARNING
Never reach into unit while fan is running.
Lock open and tag unit disconnect before
working on fan. Remove fuses and take them
with you after noting this on tag.
CAUTION
Sharp edges of coil fins are exposed. To prevent injury, cover top of evaporator with
cardboard or a few layers of heavy tape.
CAUTION
To avoid coil damage, cover evaporator face
with plywood or other rigid sheet material.
If any coil fins are mashed or bent, straighten with a coil fin comb of the proper tooth
spacing (refer to “coil fins/inch” in Table 1
through Table 2). Check for refrigerant
leaks.
5.1

Return--Air Grille Removal

Figure 8 Fan Pulley Adjustment

a. Pull grille out from top.

Shut off unit power supply.
Loosen fan motor pulley set screws and slide fan pulley
along fan shaft. Make angular alignment by loosening
motor from mounting bracket (See Figure 8).

PULLEY ALIGNMENT --

b. Pull grille up to release hinge pins from lower panel.
c. To reassemble, reverse procedure.
9

62--10458--00

BELT TENSION ADJUSTMENT -- Shut off unit power
supply. Loosen fan motor from mounting bracket. Do
not loosen motor mounting bracket from unit. Move fan
motor up or down until proper belt tension is achieved
(approximately 3/4--in. deflection with 8--pound
tension at midpoint of belt span).
Lubrication -- Fan motor and fan shaft bearings are
lubricated for the life of the bearings. No re--lubrication
is required

5.4

spring tension, decrease water flow and increase pressure.
If pressure reading is above operating range, rotate
the square head adjusting screw clockwise; this will
decrease spring tension, increase water flow and decrease pressure.
c. Only the water regulating valve opening point is adjustable. The closing point is 3 to 7 psig below the
opening point and is non--adjustable.

Return--Air Filter

5.8

Inspect filters twice monthly and clean as required by
operating conditions. Filter size and type are listed in
Table 1, Table 3 or Table 2. To clean filters flush with
hot water or steam or soak in a mild water solution of
soap or detergent. Refer to filter manufacturer’s
instructions as applicable. Do not operate unit without
return--air filters in place.
5.5

WARNING
Follow all Safety codes. Wear safety glasses
and rubber gloves when using inhibited hydrochloric acid solution.

Condensate Drain

Clean condensers with an inhibited hydrochloric acid
solution. The acid can stain hands and clothing, attack
concrete and, without inhibitor, can attack steel. Cover
surroundings to guard against splashing. Vapors from
vent pipe are not harmful, but take care to prevent liquid
from being carried over by the gases.
Warm solution acts faster, but cold solution is just as
effective if applied for a longer period.

Clean the drain line and unit drain pan at the start of each
cooling season. Check flow by pouring water into drain.
Be sure trap is filled as shown in Figure 7 to maintain an
air seal.
5.6

Condenser

Condensers may require cleaning of water--deposited
scale.

Evaporator Coil

WARNING
Never reach into unit while fan is running.
Lock open and tag unit disconnect before
working on fan. Remove fuses and take them
with you after noting this on tag.
Remove dirt and debris from evaporator coil as required
by condition. Clean coil with a stiff brush, vacuum
cleaner or compressed air. Use a fin comb of the correct
tooth spacing (Refer toTable 1, Table 3 or Table 2 for
coil fins/inch) when straightening mashed or bent coil
fins.
5.7

Water Regulating Valve

PREPARATION FOR OPERATION.

a. Open the water regulating valve inlet and outlet isolation valves.
b. Close the water regulating valve bypass valve.
ADJUSTMENT
a.

Figure 9 Gravity Flow Method

The compressor discharge pressure is controlled by
the water regulating valve and may be monitored by
observing liquid line pressure.

GRAVITY FLOW METHOD

a. Disconnect condenser piping at unit, including isolation valves and water regulating valve.
b. Fill condenser as shown in Figure 9. Follow acid
manufacturer’s instructions. When condenser is full,
allow solution to remain overnight
c. Drain condenser and flush with clean water.

NOTE
Adjustments to the water regulating valve must
be made slowly, allowing ample time for response and stabilization.

FORCED CIRCULATION METHOD

b. Install a calibrated gauge at the liquid line service
port. Operating liquid line range for R--22 units is 250
to 270 psig (1724 to 1862 kPa), for R--134a units is
155 to 180 psig (1069 to 1241 kPa) and for R--407C is
267 to 288 psig (1841 to 1986 kPa). If pressure reading is below operating range, rotate the square head
adjusting screw counterclockwise; this will increase
62--10458--00

a. Disconnect condenser piping at unit, including isolation valves and water regulating valve.
b. Fill system as shown in Figure 10. Follow acid
manufacturer’s instructions. Fully open vent pipe
when filling system. The vent may be closed when
system is full and pump is operating.
10

c. Regulate flow to condenser with a supply line valve.
If pump is a non--overloading type, the valve may be
fully closed while pump is running. For average scale
deposit, allow solution to remain in condenser overnight. For heavy scale deposit, allow 24 hours.
d. Drain condenser and flush with clean water.

(1607 kPa) for R--407C units. Charge to a clear sight
glass.
90MU004 UNITS R--22

90MU006 UNITS R--22

5.9

Figure 10 Forced Circulation Method
Refrigerant Charging

90MA/MF -- These units are shipped with a full

operating charge. If recharging is necessary (complete
charge lost), weigh in amount of refrigerant indicated on
unit nameplate and in Table 1, Table 3 or Table 2.
If unit has partial charge, it must be recharged by
removing existing charge and recharging by weighing
in the required amount of refrigerant.
90MU004 & 006 -- These units, used with remote
condensers, are shipped with a holding charge only. To
charge:
a. Open discharge and liquid service valves.
b. Leak test, reclaim refrigerant and evacuate.
c. Using standard refrigerant charging techniques and
charging charts (Figure 11) add refrigerant as required to maintain proper operating conditions.
90MU008 & 012 -- These units, used with remote
condensers, are shipped with a holding charge only. To
charge:
a. Open discharge line, liquid line, compressor discharge and compressor suction service valves.
b. Leak test, reclaim refrigerant and evacuate.
c. Add sufficient refrigerant vapor to permit continuous
operation after starting unit.
d. Start unit. Using standard charging techniques, add
refrigerant as required to maintain normal operating
conditions. Use charging chart supplied with condenser, if available. If information is not available,
block off enough of condenser or set water regulating
valve as applicable to maintain a discharge pressure
of 220 psig (1517 kPa) for R--22 units or 233 psig

2758
2620
2482
2344
2206
2069
1930
1793
1655
1517
1379
1241

COMPRESSOR DISCHARGE PRESS -- PSIG

COMPRESSOR DISCHARGE PRESS -- kPa

90MU004 UNITS R--407C
400
380
360
340
320
300
280
260
240
220
200
180

(TEA = TEMPERATURE, ENTERING AIR)

TEA120F/49C
TEA110F/43C
TEA100F/38C
TEA90F/32C
TEA80F/27C
TEA70F/21C
TEA60F/16C

70 75 80 85
90 95 100PSIG
483 517 552 587 622 655 690kPa
COMPRESSOR SUCTION PRESSURE

2758
2620
2482
2344
2206
2069
1930
1793
1655
1517
1379
1241

COMPRESSOR DISCHARGE PRESS -- PSIG

COMPRESSOR DISCHARGE PRESS -- kPa

90MU006 UNITS R--407C
400
380
360
340
320
300
280
260
240
220
200
180

(TEA = TEMPERATURE, ENTERING AIR)

TEA110F/43C
TEA100F/38C
TEA90F/32C
TEA80F/27C
TEA70F/21C
TEA60F/16C

70 75 80 85
90 95 100PSIG
483 517 552 587 622 655 690kPa
COMPRESSOR SUCTION PRESSURE

Figure 11 Charging Charts

11

62--10458--00

5.10

5.13

Evaporator Fan Motor Removal

All units are equipped with Cycle--LOC
current--sensing lockout relay. This device will lock out
the compressor after any safety trip (discharge pressure
switch, suction--pressure switch, or internal overload of
the compressor). Check reason for lockout before
resetting the device. Refer to unit label wiring diagram.
To reset, turn the system switch to OFF, then back to
COOL.
5.14 Discharge and Suction Pressure Switches
Refer to Table 1 through Table 2 for opening and
closing settings for these safety devices.
The discharge pressure switch is located on the
compressor on the 008 & 012 size units and on the
discharge line on all other units. The suction pressure
switch is located on top of the compressor on 06DR
compressor equipped units and on the suction line on all
other units.

a. Shut off unit main power supply.
WARNING
Lock open and tag unit disconnect before
working on fan motor. Remove fuses and
take them with you after noting this on tag.

CAUTION
Before attempting to remove fan motors or
motor mounts, place a piece of plywood over
evaporator coils to prevent coil damage.
b. Loosen motor hold down bolts on mounting bracket
so that fan belt can be removed. Motor power wires
need not be disconnected from motor terminals before motor is removed from unit.

5.15

d. Slide motor/bracket assembly to extreme right, remove bolts and lift out through space between fan
scroll and side. Rest motor on a high platform such as
a step ladder. Do not allow motor to hang by its power
wires.
Pressure Relief Device

All units are equipped with a fusible--plug type safety
relief device on the refrigerant tubing. The relief setting
is 197 _F to 203 _F on all units.
5.12

Crankcase Heater

A crankcase heater is supplied on the 008 & 012 size
units and on all 134a units. The heater prevents liquid
refrigerant from accumulating in the compressor
crankcase during extended shutdown periods. Heater is
automatically energized whenever unit main power is
on and compressor is stopped. Heater is de--energized
when compressor starts.
Do not shut off main power supply for an extended
period except for servicing unit. Turn on power supply
for at least 24 hours after an extended shutdown before
starting compressor. Refer to “Operation”.

62--10458--00

Oil Charge

All units are factory charged with oil. On 06D
compressors, observe the oil level in the sight glass at
start--up. If unit oil level is below sight glass, add oil
until level reaches approximately 1/4 sight glass.
If oil charge is above sight glass, do not remove any oil
until the compressor crankcase heater has been
energized for at least 24 hours.
When additional oil or a complete charge is required,
use only the following Carrier approved oil.
R--22 Units
Design Series One 204/206 size units
Witco part number 999--5170--55
Design Series One 208/212 size units and all Design
Series Two
Witco -- Suniso 3GS
Calumet -- RO--15
R--134a Units
Castrol -- Icematic E68
ICI -- Emkarate RL68HP
R--407C Units
Copeland Ultra 22CC
004 and 006
Mobil Artic EAL 22CC
ICI (Virginia KMP) Emkarate
RL32C
Thermal Zone 22CC
Castrol -- Icematic E68
008 and 012
ICI -- Emkarate RL68HP

c. Loosen but do not remove the 2 motor mounting
bracket bolts on left side of bracket.

5.11

Cycle--LocTM -- Protection Device

12

Figure 12 Mounting Base

13

62--10458--00

40.25

52.00

004/006 SIZE

008/012 SIZE
27.31

22.00

B
50.00

38.25

C

D
48.00

36.25

BASED ON DRAWING 50BW400093

A

USED ON
--

E
1.25

A

45.50

--

F

23.31

18.005

G

0.75

--

H

25.81

--

J

--

3.18

K

--

2.56

L

--

8.75

M

--

2.00

N

--

1.00

P

9.00

5.00

R

6.00

7.50

S

16.50

15.00

T

10.00
15.38

V

--

0.70

W

WIRE PASSES THOUGH LOOP OF CL
CC
FIELD

L1

11

21

BLK

1

POWER

L2

12

22

BLU

2

SUPPLY

L3
G

13

23

YEL

3

GROUND

IFC

YEL

T3

12

22

BLU

T2

13

23

BLK

T1

11

BLU
BLK

C
IPF

21

YEL

IPC

IFM

GRN
BLU

CHR

BLK

BLU
H3

H1
H2

TRAN

5

4

ORN

BLK

VIO

BLK

H5
H4

CH
H6

SEE NOTE 1
GRN

RED

RED

F

X1

X2

24VOLT

BRN

C2 CC

SW (SEE NOTE 3)

BRN

NO
NC

ORN

NO

YEL

RED
ORN
T--LOW
R

TB1--1

VIO

IFC

RED

RED

CC

BRN

CHR

TB1--4

C2 CHR

BRN

1

3

CC

RED

BRN

TRAN
C2 IFC

90MU UNITS ONLY

YEL

RED
CL

W

TB1--5 RED

CFR
X
2

BRN

LOGIC 1
3

B

RED

H2

BRN

TB1--3
BRN

DPS

OPTIONAL ELECTRIC DUCT HEATER
HEATERS
H1

BLU

SPS

CHR
BRN

CHR

BLU

1 CL

BRN

IFC

FOR HOT WATER/STEAM
HEAT SEE NOTE 2

L1
90MU CONDENSER FAN WIRING

L2
L3
G
TB1--4

GROUND

MC

AS

AC
H1

H2
TB1--3

11

21

12

22

13
SHIPS POWER

23
CFR

TO FAN

SINGLE OR THREE PAHSE AS REQUIRED

Figure 13 Wiring Schematic -- 90MA/MF/MU004/006
62--10458--00

14

CONTROL BOX
11

12

13

11

12

13

H1 H3 H2 H4
TRAN

X2
21

22

23

21

22

C1 CC C2

DT1

DT1

DT2

B

F

DT2

1

TB1

4

1 2 3 4 5
CLO

X1

23

C1 IFC C2

11

12

13

21

22

23

CONTROL PANEL
FAN COOL
A W A R ME
B
R
OFF
HEAT

A

CO

O LER

3

2

TB1--1

6

5

NO

C1 CHR C2
VIEW A--A
GROUND

X 3

2 1

C1 CFR C2

AS
AC
C
CC
CH
CFR
CHR
CL
DPS
F
H1
H2
IFC
IFM
IPC
IPF
MC
SPS
SW
T
TB
TRAN

90MU ONLY

LEGEND
AIR SWITCH
AUTOMATIC CUTOUT
COMPRESSOR
COMPRESSOR CONTACTOR
CRANKCASE HEATER
CONDENSER FAN RELAY
CRANKCASE HEATER RELAY
COMPRESSOR LOCKOUT
DISCHARGE PRESSURE SWITCH
FUSE
CONTROLLING HEAT CONTACTOR
BACKUP HEAT CONTACTOR
INDOOR FAN CONTACTOR
INDOOR FAN MOTOR
INTERNAL PROTECTOR--COMPRESSOR
INTERNAL PROTECTOR--FAN MOTOR
MANUAL (RESET) CUTOUT
SUCTION PRESSURE SWITCH
SWITCH
THERMOSTAT
TERMINAL BOARD
TRANSFORMER

TB1--5

NO

TB1--4

NC

VIEW B--B

NOTES:
1. 208--230/3/60 VOLT UNITS FACTORY WIRED
TO TRANSFORMER TERMINAL H2 (208 VOLT
TAP). FOR 230 VOLT APPLICATIONS, RE--CONNECT TO TERMINAL H3 (230 VOLT TAP).
460/3/60 VOLT UNITS FACTORY WIRED TO
TERMINAL H6. 400/3/50 VOLT UNITS FACTORY
WIRED TO TERMINAL H5.
2. CONNECTION POINTS AT TB--1 TERMINALS
3 & 4 MAY BE USED FOR HEAT CONTROLS.
MAXIMUM LOAD IS 250 VA INRUSH, 50 VA
SEALED.
3. SWITCH CONTACT ARRANGEMENT IS AS
SHOWN BELOW.

TERMINAL BOARD TERMINAL
TERMINAL (MARKED)
TERMINAL/SPLICE (UNMARKED)
LOCKOUT TERMINAL
FACTORY WIRING
FIELD WIRING
INDICATES COMMON POTENTIAL,
DOES NOT REPRESENT WIRING

OFF

FAN

COOL

HEAT

Figure 14 Component Arrangement -- 90MA/MF/MU004/006
15

62--10458--00

WIRE PASSES THOUGH
LOOP OF CL
CC
FIELD

L1

11

21

POWER

L2

12

22

BLU

SUPPLY

L3
G

13

23

YEL

GROUND

YEL

11

BLU
BLK

OLB

4

BLK

1

(COLOR VARIES)

2

OLA

4

IFC

3

3

21

YEL

T3

12

22

BLU

T2

13

23

BLK

T1

C

3

(COLOR VARIES)

IPF
IFM

GRN
CHR

BLU
BLU

BLK
H1

H3

H2

TRAN

4

5

ORN

BLK

VIO

BLK

H5
H4

CH
H6

SEE NOTE 1
GRN

RED
SW(SEE NOTE 3)

RED

F

X1
TB1--1

VIO

NC

RED

NO

ORN
T--LOW
R

1

3

ORN

9

IPC

TB1--5

DPS

BLK

B

BRN

CFR

8

CL
RED

X
2

LOGIC 1
3

RED

BRN

RED

2

1

TB1--3 JUMPER TB1--2 BRN

90MA012
UNITS ONLY

OLB
1

TRAN

BRN

BRN

BLK
OLA
2

CC

BRN C2 IFC

CC

RED

90MU UNITS ONLY

YEL

W

IFC

RED

CHR

TB1--4
RED

RED

C2 CC

BRN

BRN C2 CHR

NO

YEL

X2

24VOLT

BLU

SPS

US

BRN

LLS
CHR

BRN
BRN
CHR

1 CL

BRN

IFC

BLU

BRN

TB1--2

BLK

BRN

TB1--2

BLU

ORN
T--HIGH
R

90MA012 UNITS ONLY
BLU

W

BLK

B

H2

C DT1

BLU

C DT2

BLU

OPTIONAL ELECTRIC DUCT HEATER
HEATERS
H1

FOR HOT WATER/STEAM
HEAT SEE NOTE 2
90MU CONDENSER FAN WIRING

L2

TB1--4

US

BLK

L1

L3
G

LLS

GROUND

MC

AS

AC

21

12

22

13
H1

H2

11

SHIPS POWER

TB1--3

23
CFR

TO FAN

SINGLE OR THREE PAHSE AS REQUIRED

Figure 15 Wiring Schematic -- 90MA/MF/MU008/012
62--10458--00

16

CONTROL BOX
11

12

13

11

12

13

H1 H3 H2 H4
TRAN

X2
21

22

23

21

22

C1 CC C2

DT1

DT1

DT2

DT2

1
4

1 2 3 4 5
11

12

B

F

TB1

CLO

X1

23

C1 IFC C2

13

2
5

CONTROL PANEL
FAN COOL
A W A R ME
B
R
OFF
HEAT

A

CO
O LER

3
TB1--1

6

NO

C1 CHR C2
VIEW A--A
GROUND

X 3

2 1

21

22

23

C1 CFR C2

AS
AC
C
CC
CH
CFR
CHR
CL
DT
DPS
F
H1
H2
IFC
IFM
IPC
IPF
LLS
OL
MC
SPS
SW
T
TB
TRAN
US

90MU ONLY

LEGEND
AIR SWITCH
AUTOMATIC CUTOUT
COMPRESSOR
COMPRESSOR CONTACTOR
CRANKCASE HEATER
CONDENSER FAN RELAY
CRANKCASE HEATER RELAY
COMPRESSOR LOCKOUT
DUMMY TERMINAL
DISCHARGE PRESSURE SWITCH
FUSE
CONTROLLING HEAT CONTACTOR
BACKUP HEAT CONTACTOR
INDOOR FAN CONTACTOR
INDOOR FAN MOTOR
INTERNAL PROTECTOR--COMPRESSOR
INTERNAL PROTECTOR--FAN MOTOR
LIQUID LINE SOLENOID
OVER LOAD
MANUAL (RESET) CUTOUT
SUCTION PRESSURE SWITCH
SWITCH
THERMOSTAT
TERMINAL BOARD
TRANSFORMER
UNLOADER SOLENOID

TB1--5

NO

TB1--4

NC

VIEW B--B

NOTES:
1. 208--230/3/60 VOLT UNITS FACTORY WIRED
TO TRANSFORMER TERMINAL H2 (208 VOLT
TAP). FOR 230 VOLT APPLICATIONS, RE--CONNECT TO TERMINAL H3 (230 VOLT TAP).
460/3/60 VOLT UNITS FACTORY WIRED TO
TERMINAL H6. 400/3/50 VOLT UNITS FACTORY
WIRED TO TERMINAL H5.
2. CONNECTION POINTS AT TB--1 TERMINALS
3 & 4 MAY BE USED FOR HEAT CONTROLS.
MAXIMUM LOAD IS 250 VA INRUSH, 50 VA
SEALED.
3. SWITCH CONTACT ARRANGEMENT IS AS
SHOWN BELOW.

TERMINAL BOARD TERMINAL
TERMINAL (MARKED)
TERMINAL/SPLICE (UNMARKED)
LOCKOUT TERMINAL

OFF

FACTORY WIRING
FIELD WIRING
INDICATES COMMON POTENTIAL,
DOES NOT REPRESENT WIRING

FAN

COOL

HEAT

Figure 16 Component Arrangement -- 90MA/MF/MU008/012
17

62--10458--00

A

M

Access Panel, 9

Model Chart, 1

Accessory Plenum, 1

Mounting Base, 13

Air Filter, 5, 10

C
Component Arrangement, 15, 17

O
Oil Charge, 12

Condensate Drain, 7, 10

P

Condenser, 10
Condenser Connections, 6
Crankcase Heater, 12
Cycle--Loc, 12

Pressure Relief Device, 12
Pressure Switches, 12

R

E
Electrical Connections, 7

Refrigerant Charging, 11

Evaporator Coil, 10

Remote Condenser, 7
Return Air, 1

F
S

Fan Adjustment, 9
Fan Motor, 12
Fan Shaft, 5

H

Sequence Of Operation, 8
Shut Down Unit, 8
Spring Mounts, 6
Start Unit, 8

Heating Coil, 1

I
Installation, 1

V
Ventilation, 1

Introduction, 1

L
Line Sizes, 7

W
Water Regulating Valve, 10
Wiring Schematic, 14, 16

Index -- 1

62--10458--00



---

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