Marine/Industrial
Single Package
Cooling Unit
Models
90MA/MF/MU, Design Series Two
Beginning Serial Number C00400
62--10458--00
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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 thefollowing threesections 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 matterhowslight, should nevergo unattended. Always obtain first aid ormedical attentionimmediately.
OPERATING PRECAUTIONS
Always wear safety glasses.
Keep hands, clothing and tools clear of the evaporator and condenser fans.
No work should beperformed on theunit until all circuit breakers, start-stop switches areturned off, and powersupply
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 evaporatoraccess 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 takethem 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.
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CAUTION
Sharp edges ofcoil fins areexposed. To preventinjury, cover top of evaporatorwith 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
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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.
2.
3.
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MODEL CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Protect Unit from Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Provide Unit Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Accessory Heating Coil (if applicable) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Accessory Plenum (If Supplied) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Ventilation--Air Ductwork (If required) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Return Air Ductwork (If required) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Return--Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
1
1
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
1
1
1
1
1
1
1
1
5
3.10 Align Fan Shaft and Wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.11 Check Compressor Spring Mounts (008 & 012 size only) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.12 Make Condenser Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.13 Install Condensate Drain Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.14 Make Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
6
6
7
7
4.
5.
8
4.1
4.2
4.3
To Start Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
To Shut Down Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sequence Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Return--Air Grille Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Access Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evaporator Fan Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Return--Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Regulating Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Refrigerant Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
8
8
9
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
9
9
9
10
10
10
10
10
11
12
12
12
12
12
12
5.10 Evaporator Fan Motor Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.11 Pressure Relief Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.12 Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.13 Cycle--LocTM -- Protection Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.14 Discharge and Suction Pressure Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.15 Oil Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
i
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LIST OF ILLUSTRATIONS
FIGURE NUMBER
Page
1
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
3
4
7
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1. INTRODUCTION
3.1
Inspect Unit
Check unit against shipping order. Inspect carefully for
concealed shipping damage. If shipment is damaged or
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.
incomplete, fileclaimwith transportation companyand
advise Carrier Transicold immediately.
3.2
Protect Unit from Damage
To maintain warranty, protect unit against adverse
weather, theft, or vandalism on job site.
3.3
Provide Unit Support
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.
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.
3.4
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. Useslings with spacerunderbaseskid to preventpan-
el damage when using hoist.
(90MA/MF
ONLY)
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.
Figure 1 Base Unit Interior Details (Typical)
2.
MODEL CHART
e. Unit should be level. Unit leveling tolerance is 1/8
inch per linear foot in any direction.
This manual covers 90M design series two units as
shown in the following model chart.
3.6
Install Accessory Plenum (If Supplied)
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
9
2
0
3
4
5
6
1
7
8
9
6
10 11
1
3
2
---
2
M
A
3.7
Install Ventilation--Air Ductwork
(If required)
PRODUCT
CODE
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.
MODEL
VOLTAGE
5 - 208/230-3-60
6 - 460-3-60
MA - 90/10 Copper Nickel
Condenser
MF - Copper Condenser
MU - Condenserless
9 - 400-3-50
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.
2 - R-22
DESIGN
SERIES
3 - R-134a
4 - R-407C
NOMINAL COOLING
CAPACITY (R--22)
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:
3.
INSTALLATION
To install the unit, do the following:
a. Cut out the alternate return--air opening as required.
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Table 1 90MA/MF/MU Physical Data -- Refrigerant 22
R--22 -- English Units
R--22 -- Metric Units
BASE UNIT 90MA/MF/MU
UNITS
204
3
206
5
208
7.5
212
10
204
206
208
212
English (Metric)
NOMINAL CAPACITY
OPERATING WEIGHT
Base Unit -- 90MA/MF
Base Unit -- 90MU
Tons (kW)
10.5
17.6
26.4
35.1
Pounds (kg)
Pounds (kg)
Pounds (kg)
390
330
25
427
360
25
895
835
50
950
890
50
177
150
11.3
194
163
11.3
406
379
22.7
431
404
22.7
Discharge Plenum
COMPRESSOR TYPE
Welded Hermetic
Scroll
Semi--Hermetic Welded Hermetic
Reciprocating Scroll
Semi--Hermetic
Reciprocating
Quantity of Cylinders
--
--
--
--
--
--
4
0
1
6
2
2
--
--
--
--
--
--
4
0
1
6
2
2
Quantity of Unloading Cylinders
Quantity of Capacity Steps
DISCHARGE PRESSURE SWITCH
Opens -- 90MA/MF
Closes -- 90MA/MF
Opens -- 90MU
psig (kPa)
psig (kPa)
psig (kPa)
psig (kPa)
395ꢀ10
295ꢀ20
426ꢀ7
2725ꢀ69
2034ꢀ138
2937ꢀ48
2206ꢀ138
Closes -- 90MU
320ꢀ20
SUCTION PRESSURE SWITCH
Opens
Closes
OPERATING CHARGE -- 90MA/MF
CONDENSER -- 90MA/MF
Number & Type
psig (kPa)
psig (kPa)
pounds (kg)
27ꢀ4
67ꢀ7
186ꢀ28
462ꢀ48
3.1
5.3
11.2
10
1.4
2.4
5.1
4.5
1....Tube In Tube
2.42 1.48
Water Volume
gallon (liter)
0.39
0.86
3.3
9.2
EVAPORATOR AIR FAN
Nominal Flow
Adjustable, Belt Driven Centrifugal: 1750 RPM Motor @ 60 Hz
2000 3000 4000 1698 2830 4245
3
cfm (m /h)
1200
5660
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
RPM
525-750 647-915 495-700 600-850 427-652 593-762 412-583 500-708
1050
inches (cm)
inches (cm)
1 / 8.0
1 / 6.4
1 / 8.5
1 / 7.0 1 / 20.3 1 / 16.3 1 / 21.6 1 / 17.8
6.1 to 8.6
2.4 to 3.4
horse power 1/3...56 3/4...56 1...56
horse power 3/4...56 1...56
horse power -- -- -- --
2...56 .25 / 56 .56 / 56 .75 / 56 1.5 / 56
3...56 .56 / 56 .75 / 56 1.5 / 56 2.2 / 56
2...56
3...56
-- --
-- --
-- --
2.2 / 56
-- --
3/8 (.95 cm) OD, Copper Tubes, Aluminum Fins
Prime
Tube Type
Quantity of Rows...fin Spacing
Face Area
fins/inch(cm) 2...14.4 3...14.4
3...12.5
7.3 8.5
2...5.7
0.46
3...5.7
0.46
3...4.9
0.68 0.79
sq ft (sq m)
5
5
RETURN AIR FILTERS
Quantity...Size
Factory Supplied, Cleanable
4...16 x 20 x 1 2...40.6x63.5x2.5 4...40.6x50.8x2.5
inches (cm)
2...16 x 25 x 1
CONDENSER CONNECTIONS
Water Inlet (bottom) & Outlet (top)
Maximum Working Pressure (refrigerant side)
CONDENSATE DRAIN CONNECTIONS
ACCESSORY HEATING COILS
HOT WATER
inches FPT
psig (kPa)
inches FPT
1/2
3/4
1
1
1/2
3/4
1
1
400
3/4
2758
3/4
Quantity of Rows...fin spacing
Face Area
fins/inch(cm)
sq ft (m)
1...15
5
1...15
5
2...14
6
2...14
6
1...5.9
0.46
1...5.9
0.46
2...5.5
0.56
2...5.5
0.56
Water Inlet (top) & Outlet Connection (bottom)
STEAM
inches (cm)
7/8 ODF
1--1/4 MPT
7/8 ODF
1--1/4 MPT
Quantity of Rows...fin spacing
Face Area
Water Inlet (top) & Outlet Connection (bottom)
fins/inch(cm)
sq ft (m)
inches (cm)
See Note 2
See Note 2
See Note 2
1...14
6.9
1--1/4 MPT
1...14
6.9
See Note 2
See Note 2
See Note 2
1...5.5
0.64
1--1/4 MPT
1...5.5
0.64
LEGEND
FPT = Female Pipe Thread 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 represen-
tative.
2. Accessory heating coil in 004 and 006 units is combination hot water/steam. See hot water data.
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Table 2 90MA/MF/MU Physical Data -- Refrigerant 407C
R--407C -- English Units
R--407C -- Metric Units
BASE UNIT 90MA/MF/MU
UNITS
404
3
406
5
408
7.5
412
10
404
406
408
412
English (Metric)
NOMINAL CAPACITY
OPERATING WEIGHT
Base Unit -- 90MA/MF
Base Unit -- 90MU
Tons (kW)
10.5
17.6
26.4
35.1
Pounds (kg)
Pounds (kg)
Pounds (kg)
390
330
25
427
360
25
895
835
50
950
890
50
177
150
11.3
194
163
11.3
406
379
22.7
431
404
22.7
Discharge Plenum
COMPRESSOR TYPE
Welded Hermetic
Scroll
Semi--Hermetic Welded Hermetic
Reciprocating Scroll
Semi--Hermetic
Reciprocating
Quantity of Cylinders
--
--
--
--
--
--
4
0
1
6
2
2
--
--
--
--
--
--
4
0
1
6
2
2
Quantity of Unloading Cylinders
Quantity of Capacity Steps
DISCHARGE PRESSURE SWITCH
Opens -- 90MA/MF
Closes -- 90MA/MF
Opens -- 90MU
psig (kPa)
psig (kPa)
psig (kPa)
psig (kPa)
395ꢀ10
295ꢀ20
426ꢀ7
2725ꢀ69
2034ꢀ138
2937ꢀ48
2206ꢀ138
Closes -- 90MU
320ꢀ20
SUCTION PRESSURE SWITCH
Opens
Closes
OPERATING CHARGE -- 90MA/MF
CONDENSER -- 90MA/MF
Number & Type
psig (kPa)
psig (kPa)
pounds (kg)
27ꢀ4
67ꢀ7
186ꢀ28
462ꢀ48
3.1
5.3
11.2
10.0
1.4
2.4
5.1
4.5
1....Tube In Tube
2.42 1.48
Water Volume
gallon (liter)
0.39
0.86
3.3
9.2
EVAPORATOR AIR FAN
Nominal Flow
Adjustable, Belt Driven Centrifugal: 1750 RPM Motor @ 60 Hz
2000 3000 4000 1698 2830 4245
3
cfm (m /h)
1200
5660
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
RPM
525-750 647-915 495-700 600-850 427-652 593-762 412-583 500-708
1050
inches (cm)
inches (cm)
1 / 8.0
1 / 6.4
1 / 8.5
1 / 7.0 1 / 20.3 1 / 16.3 1 / 21.6 1 / 17.8
6.1 to 8.6
2.4 to 3.4
horse power 1/3...56 3/4...56 1...56
horse power 3/4...56 1...56
horse power -- -- -- --
3/8 OD, Copper Tubes, Aluminum Fins
Prime Prime
fins/inch(cm) 2...14.4 3...14.4
2...56 .25 / 56 .56 / 56 .75 / 56 1.5 / 56
3...56 .56 / 56 .75 / 56 1.5 / 56 2.2 / 56
2...56
3...56
-- --
-- --
-- --
2.2 / 56
-- --
3...12.5
7.3 8.5
Factory Supplied, Cleanable
2...16 x 25 x 1 4...16 x 20 x 1
2...5.7
0.46
3...5.7
0.46
3...4.9
sq ft (sq m)
5
5
0.68
0.79
Factory Supplied, Cleanable
2...40.6x63.5x2.5 4...40.6x50.8x2.5
inches (cm)
CONDENSER CONNECTIONS
Water Inlet (bottom) & Outlet (top)
Maximum Working Pressure (refrigerant side)
CONDENSATE DRAIN CONNECTIONS
ACCESSORY HEATING COILS
HOT WATER
inches FPT
psig (kPa)
inches FPT
1/2
3/4
1
1
1/2
3/4
1
1
400
3/4
2758
3/4
Quantity of Rows...fin spacing
Face Area
fins/inch(cm)
sq ft (m)
1...15
5
1...15
5
2...14
6
2...14
6
1...5.9
0.46
1...5.9
0.46
2...5.5
0.56
2...5.5
0.56
Water Inlet (top) & Outlet Connection (bottom)
STEAM
inches (cm)
7/8 ODF
1--1/4 MPT
7/8 ODF
1--1/4 MPT
Quantity of Rows...fin spacing
Face Area
Water Inlet (top) & Outlet Connection (bottom)
fins/inch(cm)
sq ft (m)
inches (cm)
See Note 2
See Note 2
See Note 2
1...14
6.9
1--1/4 MPT
1...14
6.9
See Note 2
See Note 2
See Note 2
1...5.5
0.64
1--1/4 MPT
1...5.5
0.64
LEGEND
FPT = Female Pipe Thread 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 represen-
tative.
2. Accessory heating coil in 004 and 006 units is combination hot water/steam. See hot water data.
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Table 3 90MA/MF Physical Data -- Refrigerant 134a
R--134a -- English Units
R--134a -- Metric Units
BASE UNIT 90MA/MF
UNITS
308
312
308
312
English (Metric)
NOMINAL CAPACITY
OPERATING WEIGHT
Base Unit
Tons (kW)
5.5
8
19.3
28.1
Pounds (kg)
Pounds (kg)
895
50
950
50
406
22.7
431
22.7
Discharge Plenum
COMPRESSOR TYPE -- Reciprocating
Quantity of Cylinders
Quantity of Unloading Cylinders
Quantity of Capacity Steps
DISCHARGE PRESSURE SWITCH
Opens
Semi--Hermetic
Semi--Hermetic
4
0
1
6
2
2
4
0
1
6
2
2
psig (kPa)
psig (kPa)
335ꢀ10
235ꢀ20
2310ꢀ69
1620ꢀ138
Closes
SUCTION PRESSURE SWITCH
Opens
Closes
OPERATING CHARGE
CONDENSER
psig (kPa)
psig (kPa)
pounds (kg)
7ꢀ3
22ꢀ5
48ꢀ21
152ꢀ35
11.2
10
5.1
4.5
Number & Type
Water Volume
1....Tube In Tube
2.42
1....Tube In Tube
9.2
gallon (liter)
EVAPORATOR AIR FAN
Nominal Flow
Adjustable, Belt Driven Centrifugal: 1750 RPM Motor @ 60 Hz
3
cfm (m /h)
3000
4000
4245
5660
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
RPM
495--700
600--850
412--583
500--708
1050
inches (cm)
inches (cm)
1 / 8.5
1 / 7.0
1 / 21.6
1 / 17.8
2.4 to 3.4
6.1 to 8.6
horse power
horse power
horse power
1...56
2...56
3...56
2...56
3...56
-- --
.75 / 56
1.5 / 56
2.2 / 56
1.5 / 56
2.2 / 56
-- --
3/8 OD(0.95) cm, Copper Tubes, Aluminum Fins
Prime
Quantity of Rows...fin Spacing
Face Area
fins/inch(cm)
sq ft (sq m)
3...12.5
3...14.9
7.3
8.5
0.68
0.79
RETURN AIR FILTERS
Quantity...Size
Factory Supplied, Cleanable
inches (cm)
4...16 x 20 x 1
4...40.6 x 50.8 x 2.5
CONDENSER CONNECTIONS
Water Inlet (bottom) & Outlet (top)
Maximum Working Pressure (refrigerant side)
CONDENSATE DRAIN CONNECTIONS
ACCESSORY HEATING COILS
HOT WATER
inches FPT
psig (kPa)
inches FPT
1
1
1
1
400
3/4
2758
3/4
Quantity of Rows...fin spacing
Face Area
fins/inch(cm)
sq ft (m)
2...14
6
2...14
6
2...5.5
0.56
2...5.5
0.56
Water Inlet (top) & Outlet Connection (bottom)
STEAM
Quantity of Rows...fin spacing
Face Area
inches (cm)
1--1/4 MPT
1--1/4 MPT
1--1/4 MPT
1--1/4 MPT
fins/inch(cm)
sq ft (m)
inches (cm)
1...14
6.9
1...14
6.9
1...5.5
0.64
1...5.5
0.64
Water Inlet (top) & Outlet Connection (bottom)
LEGEND
FPT = Female Pipe Thread 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 represen-
tative.
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UNIT
004
006
008,012
A
B
C
36.19(919)
21.88(556)
59.12(1501)
48(1219)
29.62(752)
69.50(1765)
D
E
SEE NOTE 2
24(610)
F
G
H
J
13.81(351)
13.13(333)
0.75(19)
16.44(418)
19.38(492)
17.25(438)
1.31(33)
15(381)
0.75(19)
10.62(270)
12.5(318)
11.44(291)
K
17.06(433)
23.25(591)
25.37(644)
17(432)
L
20.50(521)
17(432)
M
N
P
Q
R
31.88(810)
2.06(52)
42.62(1083)
3(76)
10(254)
12.50(318)
16(406)
15.56(395)
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 leftof
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 Align Fan Shaft and Wheel
b. Attach a one--inch (2.5 cm) flange or attach aflanged,
flexible duct connection directly to unit.
HORIZONTAL WHEEL CENTERING -- All wheels must be
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 possibleto 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, at-
tach it directly to unit back panel and install flexible
connection between damper and remaining duct-
work. Use accepted ductwork installation proce-
dures. Follow all applicable codes.
c. Completely blank off the standard return--airopening
with a field--fabricated fillerpanel. Thepanel must be
removable for service access. Refer to paragraph 5.1.
3.9
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
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90MA/MU008/012 UNITS
90MA/MF004/006 UNITS
90MU008/012 UNITS
90MU004/006 UNITS
UNIT
90MA/MF004
90MA/MF006
A*
1/2
3/4
B*
1/2
-- --
C*
-- --
3/4
D*
¾ FPT
E
-- --
-- --
F
-- --
-- --
G
1.75
(45)
90MA/MF008/012
90MU004
90MU006
90MU008/012
1”
-- --
-- --
-- --
1”
-- --
-- --
-- --
-- --
-- --
-- --
-- --
-- --
-- --
1/2 flare
1/2 flare
5/8 O.D.
1/2 flare
1/2 flare
3/4 O.D.
* 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
Figure 5 Connection Locations
3.11 Check Compressor Spring Mounts
(008 & 012 size only)
Install water--regulating valve in water supply line
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 thereis 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
UNIT MOUNTED CONDENSER (90MA/MF) -- Condenser
water inlet and outlet connections are shown in
Figure 5. Piping arrangements for condenser cooling
water are shown in Figure 6.
Figure 6 Typical Condenser Water Piping
a. Route regulating valve capillary with its flare nut to
the port on refrigerant discharge line (Figure 1), us-
ing any convenient unused opening on side of unit.
Use a grommet in panel to prevent chafing of capil-
lary.
b. Remove cap from discharge line fitting.
c. Remove cotter pin taped to discharge line fitting. In-
sert 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. Observeall applicableplumbingand
sanitary codes.
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Table 4 Recommended Line Sizes, Remote Condenser
LENGTH OF RUN
UNIT
(90MU)
0--25
26--50
DISCH
51--75
DISCH
76--100
DISCH
DISCH
LIQUID
1/2(1.3)
1/2(1.3)
5/8(1.6)
LIQUID
1/2(1.3)
1/2(1.3)
5/8(1.6)
LIQUID
1/2(1.3)
1/2(1.3)
LIQUID
1/2(1.3)
1/2(1.3)
004
006
008
012
1/2 (1.3)
5/8(1.6)
7/8(2.2)
7/8(2.2)
5/8(1.6)
7/8(2.2)
7/8(2.2)
5/8(1.6)
7/8(2.2)
7/8(2.2)
7/8(2.2)
7/8(2.2)
5/8(1.6) 1-1/8(2.9) 5/8(1.6)
5/8(1.6) 1-1/8(2.9) 5/8(1.6) 1-1/8(2.9) 5/8(1.6) 1-1/8(2.9) 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 pre-
vent leakage. Fitting automatically seals when nut is
removed.
REMOTE MOUNTED CONDENSER (90MU) -- I n s t a l l
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.
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.
3.13 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
GENERAL -- 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.
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.
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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 se-
lector 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
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. (Re-
fer 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 de-
sired setting.
c. Ifunit may beexposed tofreezing temperatures, drain
water from condenser and water piping. Add a non-
corrosive antifreeze to residual water in system.
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
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 powersupply terminals, seeFigure 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.
On all units, the thermostat is factory installed. A
sensing element is provided in the return air. To wire
these units to aremote thermostat, or to a remotecontrol
switch and thermostat, refer to unit Wiring Diagram or
contact your Carrier Transicold representative.
4.
OPERATION
CAUTION
Compressor crankcase heater must be ener-
gized for 24 hours prior to startup toprevent
compressor bearing damage.
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
energizethecompressor 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 sizeunits arefitted with a two stage cooling system.
On these units, if thermostat switch T--HIGH is also
calling for cooling, power flows through thermostat
4.1
To Start Unit
a. Thoroughly inspect exterior of unit. Clean and dust
up debris, then wash with mild soap and water solu-
tion.
b. On 008 & 012 size units, ensure compressor dis-
charge, suction and liquid service valves are open.
The valves are accessible from the front of the unit.
To open valve, turn counterclockwise. Afteropening,
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 re-
move any oil until the crankcase heater has been ener-
gized for at least twenty--four hours.
c. With selector switch in OFF position, turn main pow-
er 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 ad-
justment, refer to paragraph 5.3.
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5.2
Access Panel Removal
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].
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.
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
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.
Ifany safety deviceopens (CLO, SPS, DPS, IP, OLAor,
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:
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. Poweralso flows through airflow switch (AS)
and automatic cutout (AC) to energize operating relay
(H1). Energizing relays H1 and H2 closes contacts to
energize the heaters.
a. Shut off unit power supply.
b. Loosen fan belt by loosening fan motor from mount-
ing bracket. Do not loosen fanmotormountingbrack-
et from unit.
c. Loosen movable pulley flange set screw (Figure 8).
d. Screwmovableflangetoward fixed flangeto 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 mo-
tor full load amps indicated on motor nameplate.
e. Set movable flange set screw at nearest flat of pulley
hub and tighten set screw.
Placing SW in the FAN position de--energizes all
cooling orheating control circuits in thesamemanneras
activation of a safety switch. Placing SW in the OFF
position also de--energizes IFC to stop the indoor fan
motor.
f. Check pulley alignment and belt tension adjustment
as described below.
5.
SERVICE
g. Check fan operation. Repeat above procedure as re-
quired.
WARNING
Never reach into unit while fan is running.
Lock open and tag unit disconnect before
working on fan. Removefuses and take them
with you after noting this on tag.
CAUTION
Sharp edges of coil fins are exposed. To pre-
vent 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, straight-
en 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.
PULLEY ALIGNMENT -- 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).
b. Pull grille up to release hinge pins from lower panel.
c. To reassemble, reverse procedure.
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BELT TENSION ADJUSTMENT -- Shut off unit power
supply. Loosen fan motor from mounting bracket. Do
not loosen motor mounting bracket from unit. Movefan
motor up or down until proper belt tension is achieved
(approximately 3/4--in. deflection with 8--pound
tension at midpoint of belt span).
spring tension, decrease water flow and increasepres-
sure.
If pressure reading is above operating range, rotate
the square head adjusting screw clockwise; this will
decrease spring tension, increase water flow and de-
crease pressure.
Lubrication -- Fan motor and fan shaft bearings are
lubricated for the life of the bearings. No re--lubrication
is required
c. Only the water regulating valve opening point is ad-
justable. The closing point is 3 to 7 psig below the
opening point and is non--adjustable.
5.4
Return--Air Filter
5.8
Condenser
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.
Condensers may require cleaning of water--deposited
scale.
WARNING
Follow all Safety codes. Wear safety glasses
and rubber gloves when using inhibited hy-
drochloric acid solution.
5.5
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.
Clean the drain line and unit drain pan at the start of each
cooling season. Check flowby pouring water into drain.
Be sure trap is filled as shown in Figure 7 to maintain an
air seal.
5.6
Evaporator Coil
Warm solution acts faster, but cold solution is just as
effective if applied for a longer period.
WARNING
Never reach into unit while fan is running.
Lock open and tag unit disconnect before
working on fan. Removefuses and takethem
with you after noting this on tag.
Remove dirt and debris from evaporatorcoil 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 thewater regulating valve inlet and outlet isola-
tion valves.
b. Close the water regulating valve bypass valve.
ADJUSTMENT
Figure 9 Gravity Flow Method
GRAVITY FLOW METHOD
a. The compressor discharge pressure is controlled by
the water regulating valve and may be monitored by
observing liquid line pressure.
a. Disconnect condenser piping at unit, including isola-
tion valves and water regulating valve.
NOTE
b. Fill condenser as shown in Figure 9. Follow acid
manufacturer’s instructions. When condenser is full,
allow solution to remain overnight
Adjustments to the water regulating valve must
be made slowly, allowing ample time for re-
sponse and stabilization.
c. Drain condenser and flush with clean water.
FORCED CIRCULATION METHOD
b. Install a calibrated gauge at the liquid line service
port. Operating liquid linerangefor 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 read-
ing is below operating range, rotate the square head
adjusting screw counterclockwise; this will increase
a. Disconnect condenser piping at unit, including isola-
tion 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.
62--10458--00
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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 averagescale
deposit, allow solution to remain in condenser over-
night. For heavy scale deposit, allow 24 hours.
(1607 kPa) for R--407C units. Charge to a clear sight
glass.
90MU004 UNITS R--22
d. Drain condenser and flush with clean water.
90MU006 UNITS R--22
Figure 10 Forced Circulation Method
5.9
Refrigerant Charging
90MA/MF -- These units are shipped with a full
operating charge. If recharging is necessary (complete
chargelost), weigh in amount ofrefrigerant 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 UNITS R--407C
(TEA = TEMPERATURE, ENTERING AIR)
2758
2620
2482
2344
2206
2069
1930
1793
1655
1517
1379
400
380
360
340
320
300
280
260
240
220
200
TEA120F/49C
90MU004 & 006 -- These units, used with remote
condensers, are shipped with a holding charge only. To
charge:
TEA110F/43C
TEA100F/38C
TEA90F/32C
TEA80F/27C
TEA70F/21C
TEA60F/16C
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 re-
quired to maintain proper operating conditions.
1241
180
70 75 80 85
483 517 552 587 622 655 690
90 95 100
PSIG
kPa
COMPRESSOR SUCTION PRESSURE
90MU008 & 012 -- These units, used with remote
condensers, are shipped with a holding charge only. To
charge:
90MU006 UNITS R--407C
(TEA = TEMPERATURE, ENTERING AIR)
2758 400
2620 380
2482 360
2344 340
2206 320
2069 300
1930 280
1793 260
1655 240
1517 220
1379 200
TEA110F/43C
a. Open discharge line, liquid line, compressor dis-
charge and compressor suction service valves.
TEA100F/38C
TEA90F/32C
b. Leak test, reclaim refrigerant and evacuate.
c. Add sufficient refrigerant vapor to permit continuous
operation after starting unit.
TEA80F/27C
TEA70F/21C
TEA60F/16C
d. Start unit. Using standard charging techniques, add
refrigerant as required to maintain normal operating
conditions. Use charging chart supplied with con-
denser, 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
1241 180
70 75 80 85
90 95 100
PSIG
kPa
483 517 552 587 622 655 690
COMPRESSOR SUCTION PRESSURE
Figure 11 Charging Charts
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TM
5.10 Evaporator Fan Motor Removal
5.13 Cycle--Loc -- Protection Device
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.
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.
5.14 Discharge and Suction Pressure Switches
Refer to Table 1 through Table 2 for opening and
closing settings for these safety devices.
CAUTION
Before attempting to remove fan motors or
motor mounts, place a piece of plywood over
evaporator coils to prevent coil damage.
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.
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 be-
fore motor is removed from unit.
5.15 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.
c. Loosen but do not remove the 2 motor mounting
bracket bolts on left side of bracket.
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.
d. Slide motor/bracket assembly to extreme right, re-
move bolts and lift out through space between fan
scroll and side. Rest motor on a high platform such as
astep ladder. Do not allow motorto hang by its power
wires.
When additional oil or a complete charge is required,
use only the following Carrier approved oil.
R--22 Units
5.11 Pressure Relief Device
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
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.
Witco -- Suniso 3GS
Calumet -- RO--15
5.12 Crankcase Heater
R--134a Units
Castrol -- Icematic E68
ICI -- Emkarate RL68HP
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.
R--407C Units
004 and 006
Copeland Ultra 22CC
Mobil Artic EAL 22CC
ICI (Virginia KMP) Emkarate
RL32C
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”.
Thermal Zone 22CC
Castrol -- Icematic E68
ICI -- Emkarate RL68HP
008 and 012
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Figure 12 Mounting Base
62--10458--00
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WIRE PASSES THOUGH LOOP OF CL
CC
IPC
11
12
13
21
22
23
BLK
BLU
YEL
1
L1
L2
FIELD
2
C
POWER
SUPPLY
3
L3
G
IFC
IPF
GROUND
YEL
BLU
BLK
11
12
13
21
22
23
T3
YEL
BLU
BLK
T2
T1
IFM
GRN
BLK
BLK
ORN
VIO
BLU
CHR
BLK
BLU
4
5
H3 H5
CH
H1
H2 H4
H6
SEE NOTE 1
GRN
TRAN
X1
RED
X2
RED
F
BRN
C2 CC
24VOLT
VIO
(SEE NOTE 3)
SW
BRN
CHR
C2
IFC
BRN
CC
TB1--1
NO
NC
NO
RED
ORN
YEL
BRN
BRN
TRAN
IFC
CHR
1
TB1--4
RED
3
CC
RED
90MU UNITS ONLY
BRN
C2
RED
YEL
RED
CL
CFR
ORN
LOGIC
BRN
TB1--3
X
2
1
3
T--LOW
R
W
B
RED
TB1--5
BRN
CHR
BRN
BRN
1
CL
RED
SPS
DPS
CHR
BLU
BLU
IFC
OPTIONAL ELECTRIC DUCT HEATER
H1
FOR HOT WATER/STEAM
HEAT SEE NOTE 2
HEATERS
H2
L1
L2
90MU CONDENSER FAN WIRING
11
12
13
21
22
23
L3
G
GROUND
MC
AS
AC
TB1--4
H1
H2
CFR
SHIPS POWER
TO FAN
TB1--3
SINGLE OR THREE PAHSE AS REQUIRED
Figure 13 Wiring Schematic -- 90MA/MF/MU004/006
62--10458--00
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CONTROL BOX
11 12 13
CONTROL PANEL
COOL
FAN
OFF
R
M
11 12 13
21 22 23
H1 H3 H2 H4
TRAN
A
A
B
B
W
E
R
HEAT
X2
X1
21 22 23
C
R
O
E
L
O
A
F
2
IFC
CC
C2
C1
C1
C2
DT1 DT2
DT1 DT2
1
4
3
6
TB1
1 2 3 4 5
TB1--1
NO
5
CHR
C1
C2
11 12 13
CLO
X
VIEW A--A
GROUND
21 22 23
C2
2
1
3
TB1--5
TB1--4
NO
NC
CFR
C1
90MU ONLY
LEGEND
VIEW B--B
AS
AC
C
AIR SWITCH
AUTOMATIC CUTOUT
COMPRESSOR
CC
CH
COMPRESSOR CONTACTOR
CRANKCASE HEATER
NOTES:
CFR CONDENSER FAN RELAY
1. 208--230/3/60 VOLT UNITS FACTORY WIRED
TO TRANSFORMER TERMINAL H2 (208 VOLT
TAP). FOR 230 VOLT APPLICATIONS, RE--CON-
NECT TO TERMINAL H3 (230 VOLT TAP).
CHR CRANKCASE HEATER RELAY
CL
COMPRESSOR LOCKOUT
DPS DISCHARGE PRESSURE SWITCH
F
FUSE
H1
H2
IFC
CONTROLLING HEAT CONTACTOR
BACKUP HEAT CONTACTOR
INDOOR FAN CONTACTOR
460/3/60 VOLT UNITS FACTORY WIRED TO
TERMINAL H6. 400/3/50 VOLT UNITS FACTORY
WIRED TO TERMINAL H5.
IFM INDOOR FAN MOTOR
IPC
IPF
MC
INTERNAL PROTECTOR--COMPRESSOR
INTERNAL PROTECTOR--FAN MOTOR
MANUAL (RESET) CUTOUT
2. CONNECTION POINTS AT TB--1 TERMINALS
3 & 4 MAY BE USED FOR HEAT CONTROLS.
MAXIMUM LOAD IS 250 VA INRUSH, 50 VA
SEALED.
SPS SUCTION PRESSURE SWITCH
SW
T
TB
SWITCH
THERMOSTAT
TERMINAL BOARD
3. SWITCH CONTACT ARRANGEMENT IS AS
SHOWN BELOW.
TRAN TRANSFORMER
TERMINAL BOARD TERMINAL
TERMINAL (MARKED)
TERMINAL/SPLICE (UNMARKED)
LOCKOUT TERMINAL
FACTORY WIRING
FIELD WIRING
OFF
FAN
COOL
HEAT
INDICATES COMMON POTENTIAL,
DOES NOT REPRESENT WIRING
Figure 14 Component Arrangement -- 90MA/MF/MU004/006
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WIRE PASSES THOUGH
LOOP OF CL
CC
OLB
OLA
11
12
13
21 BLK
4
4
3
3
1
FIELD
L1
L2
(COLOR VARIES)
(COLOR VARIES)
22
POWER
SUPPLY
2
BLU
C
23 YEL
3
L3
G
IFC
IPF
YEL
BLU
BLK
11
12
13
21
22
23
T3
T2
T1
YEL
BLU
BLK
GROUND
IFM
GRN
ORN
VIO
BLK
BLK
BLU
CHR
4
5
BLK
BLU
H1
H2 H4
H3 H5
CH
H6
SEE NOTE 1
GRN
TRAN
X1
RED
VIO
CC
RED
F
X2
BRN
C2
C2
24VOLT
(SEE NOTE 3)
SW
BRN
BRN
CHR
CC
IFC
TB1--1
RED
NO
NC
NO
RED
RED
90MU UNITS ONLY
BRN
CHR
1
IFC
3
CC
BRN
BRN
C2
TRAN
YEL
TB1--4
CFR
RED
RED
LOGIC
BRN
CL
RED
1
3
TB1--3 JUMPER
90MA012
X
2
TB1--2
US
BRN
YEL
ORN
T--LOW
ORN
TB1--5
BRN
LLS
UNITS ONLY
CHR
BRN
DPS
W
B
BLK
IPC
BLK
OLA
R
BRN 1 CL
OLB
SPS
BLU
9
8
2
1
2
1
CHR
BRN
IFC
RED
RED
BLU
US
ORN
90MA012 UNITS ONLY
LLS
C DT1
C DT2
T--HIGH
R
BLU
BLU
BLK
W
B
BLU
BLK
BLU
BLK
TB1--2
TB1--2
BRN
BRN
OPTIONAL ELECTRIC DUCT HEATER
H1
FOR HOT WATER/STEAM
HEAT SEE NOTE 2
HEATERS
H2
L1
L2
90MU CONDENSER FAN WIRING
11
12
13
21
22
23
L3
G
GROUND
MC
AS
AC
TB1--4
H1
H2
CFR
SHIPS POWER
TO FAN
TB1--3
SINGLE OR THREE PAHSE AS REQUIRED
Figure 15 Wiring Schematic -- 90MA/MF/MU008/012
62--10458--00
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CONTROL BOX
11 12 13
CONTROL PANEL
COOL
FAN
OFF
R
M
11 12 13
21 22 23
H1 H3 H2 H4
TRAN
A
A W
E
B
B
R
HEAT
X2
X1
21 22 23
C
R
O
E
O L
A
F
IFC
CC
C2
C1
C1
C2
DT1 DT2
DT1 DT2
1
4
3
6
2
5
TB1
1 2 3 4 5
TB1--1
NO
CHR
C1
C2
11 12 13
CLO
X
VIEW A--A
GROUND
21 22 23
C2
2
1
3
TB1--5
TB1--4
NO
NC
CFR
C1
90MU ONLY
LEGEND
AS
AC
C
AIR SWITCH
AUTOMATIC CUTOUT
COMPRESSOR
VIEW B--B
CC
CH
COMPRESSOR CONTACTOR
CRANKCASE HEATER
CFR CONDENSER FAN RELAY
NOTES:
CHR CRANKCASE HEATER RELAY
CL
DT
COMPRESSOR LOCKOUT
DUMMY TERMINAL
1. 208--230/3/60 VOLT UNITS FACTORY WIRED
TO TRANSFORMER TERMINAL H2 (208 VOLT
TAP). FOR 230 VOLT APPLICATIONS, RE--CON-
NECT TO TERMINAL H3 (230 VOLT TAP).
DPS DISCHARGE PRESSURE SWITCH
F
FUSE
H1
H2
IFC
CONTROLLING HEAT CONTACTOR
BACKUP HEAT CONTACTOR
INDOOR FAN CONTACTOR
460/3/60 VOLT UNITS FACTORY WIRED TO
TERMINAL H6. 400/3/50 VOLT UNITS FACTORY
IFM INDOOR FAN MOTOR
IPC
INTERNAL PROTECTOR--COMPRESSOR WIRED TO TERMINAL H5.
IPF
INTERNAL PROTECTOR--FAN MOTOR
2. CONNECTION POINTS AT TB--1 TERMINALS
3 & 4 MAY BE USED FOR HEAT CONTROLS.
MAXIMUM LOAD IS 250 VA INRUSH, 50 VA
SEALED.
LLS LIQUID LINE SOLENOID
OL
OVER LOAD
MC
MANUAL (RESET) CUTOUT
SUCTION PRESSURE SWITCH
SWITCH
SPS
SW
3. SWITCH CONTACT ARRANGEMENT IS AS
SHOWN BELOW.
T
THERMOSTAT
TB
TERMINAL BOARD
TRAN
TRANSFORMER
US
UNLOADER SOLENOID
TERMINAL BOARD TERMINAL
TERMINAL (MARKED)
TERMINAL/SPLICE (UNMARKED)
LOCKOUT TERMINAL
FACTORY WIRING
OFF
FAN
COOL
HEAT
FIELD WIRING
INDICATES COMMON POTENTIAL,
DOES NOT REPRESENT WIRING
Figure 16 Component Arrangement -- 90MA/MF/MU008/012
62--10458--00
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A
M
Access Panel, 9
Model Chart, 1
Accessory Plenum, 1
Air Filter, 5, 10
Mounting Base, 13
O
C
Oil Charge, 12
Component Arrangement, 15, 17
Condensate Drain, 7, 10
Condenser, 10
P
Condenser Connections, 6
Crankcase Heater, 12
Cycle--Loc, 12
Pressure Relief Device, 12
Pressure Switches, 12
R
E
Refrigerant Charging, 11
Remote Condenser, 7
Return Air, 1
Electrical Connections, 7
Evaporator Coil, 10
F
Fan Adjustment, 9
Fan Motor, 12
Fan Shaft, 5
S
Sequence Of Operation, 8
Shut Down Unit, 8
Spring Mounts, 6
Start Unit, 8
H
Heating Coil, 1
V
I
Ventilation, 1
Installation, 1
Introduction, 1
W
L
Water Regulating Valve, 10
Line Sizes, 7
Wiring Schematic, 14, 16
62--10458--00
Index -- 1
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