Carrier Air Conditioner 90MA User Manual

90MA/MU  
Single-Package Marine Cooling Units  
Installation, Operation and Service Instructions  
SAFETY CONSIDERATIONS  
The 90MA/MU Units are designed to provide safe and  
reliable service when operated within design specifications.  
However, due to system pressures, electrical components,  
and equipment location, some aspects of installation,  
operation and servicing of this equipment can be hazardous.  
Only trained, qualified installers and service technicians  
should install, operate, and service this equipment.  
When working on the equipment, observe all precautions  
on tags or labels attached to the unit. Safety notes in the  
literature, and any other safety precautions that apply.  
Follow all safety codes.  
CONTENTS  
Page  
SAFETY CONSIDERATIONS........................................1  
GENERAL .....................................................................1  
INSTALLATION.............................................................1  
Step 1- Inspect Unit .......................................................1  
Step 2 - Protect Unit from Damage................................1  
Step 3 - Provide Unit Support ........................................1  
Step 4 - Rig and Place Unit............................................8  
Step 5 - Install Accessory Plenum (If Supplied) ............8  
Step 6 – Check Fan Shaft and Wheel Alignment...........9  
Step 7 - Install Ventilation Ductwork (If Required)..........9  
Step 8 - Check Return-Air Filters ...................................9  
Step 9 - Check Compressor Spring Mounts  
Wear safety glasses and work gloves.  
(*08 & *12)................................................................9  
Step 10 - Make Condenser Connections .......................9  
Step 11 - Install Unit Drain Line ...................................11  
Step 12 - Make Electrical Connections ........................12  
OPERATION................................................................12  
To Start Unit.................................................................12  
To Shut Down Unit.......................................................12  
Service Valves .............................................................12  
SERVICE .....................................................................13  
Return-Air Grill Removal ..............................................13  
Access Panel Removal ................................................13  
Evaporator Fan Adjustment .........................................13  
Lubrication ...................................................................13  
Return-Air Filters..........................................................13  
Condensate Drains ......................................................13  
Evaporator Coil ............................................................14  
Water Regulating Valve ...............................................14  
Condenser ...................................................................14  
Charging the System....................................................15  
Evaporator Fan Motor Removal...................................15  
Pressure Relief Device.................................................15  
Crankcase Heater........................................................15  
Cycle-LOCTM Protection Device...................................15  
Discharge And Suction Pressure Switches ..................16  
Oil Charge....................................................................16  
WIRING SCHEMATIC - *04/*06...................................17  
COMPONENT ARRANGEMENT - *04/*06..................18  
WIRING SCHEMATIC - *08/*12...................................19  
COMPONENT ARRANGEMENT - *08/*12..................20  
UNIT SUPPORT DRAWINGS .....................................21  
Use care in handling, rigging, and placing bulky  
equipment.  
WARNING  
Never reach into unit while fan is running. Lock  
open and tag power disconnect before working  
on a fan. Remove the fuses and take them with  
you after noting this on tag.  
Check assembly and component weight to be  
sure rigging equipment can handle them safely.  
Note also any specific rigging instructions.  
When steam cleaning coils, be sure area is  
clear of personnel.  
GENERAL  
The 90MA/MU water cooled single-package cooling units  
are designed to provide air conditioning aboard marine  
vessels. The 90MA units are fitted with a water cooled  
condenser and are factory charged, wired and piped. The  
90MU units are similar to the 90MA except they are  
configured for use of a remote mounted condenser.  
An accessory discharge plenum may be installed to  
provide free-blow into the conditioned space. Also, an  
optional electric heater may be specified to provide comfort  
heating.  
INSTALLATION  
Step 1 - Inspect Unit - 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.  
Step 2 - Protect Unit from Damage - To maintain warranty,  
protect unit against adverse weather, theft, or vandalism on  
job site.  
Step 3 - Provide Unit Support - Refer to Figure 2 and  
Tables 1A/B/C/2A/B/C for unit size and weight. If desired,  
construct a frame of I-beams or angle iron that adequately  
supports unit. See unit support drawings contained in this  
document.  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 1  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TABLE 1B - 90MA/MU PHYSICAL DATA – R-407C , ENGLISH UNITS (See Table 2B for SI units)  
BASE UNIT (90MA/MU)  
NOMINAL CAPACITY  
REFRIGERANT  
UNITS  
Tons  
404  
3
406  
5
408  
7.5  
412  
10  
R-407C  
OPERATING WEIGHT  
Base unit 90MA  
Pounds  
Pounds  
Pounds  
390  
330  
25  
427  
360  
25  
895  
835  
50  
950  
890  
50  
Base Unit 90MU  
Discharge Plenum  
COMPRESSOR TYPE  
Qty Cylinders  
Qty Unloading Cylinders  
Qty Capacity Steps  
DISCHARGE PRESSURE SWITCH  
Opens (90MA)  
Scroll  
N/  
N/  
Semi-Hermetic, Recip  
4
0
1
6
2
2
1
PSIG  
PSIG  
PSIG  
PSIG  
395+/-10  
295+/-10  
426+/-7  
Closes (90MA)  
Opens (90MU)  
Closes (90MU)  
320+/-20  
SUCTION PRESSURE SWITCH  
Opens  
PSIG  
PSIG  
27+/-4  
67+/-4  
Closes  
REFRIGERANT  
Typ  
R-407C  
Qty (90MA ONLY))  
CONDENSER (90MA ONLY)  
Number...Type  
Pounds  
Gallons  
3.1  
5.3  
11.2  
10.0  
1…Tube in Tube  
0.86  
Water Volume  
0.39  
2.42  
EVAPORATOR AIR FAN  
Nominal Flow  
Adjustable, Belt Driven Centrifugal: 1750 RPM Motor @ 60hz  
CFM  
RPM  
RPM  
Inches  
Inches  
1200  
2000  
3000  
4000  
Standard Speed Range  
Maximum Allowable Speed  
Belt Qty/Pulley Pitch Diameter  
Motor Pulley Pitch Diameter Range  
Motor Nominal Rating (@ 60Hz)…Frame Size  
Standard  
647-914  
647-915  
487-690  
591-838  
1250  
1 / 6.4  
1 / 6.4  
1 / 8.5  
1 / 7.0  
2.4 to 3.4 inches  
HP  
HP  
HP  
1/3…56  
3/4…56  
N/  
3/4…56  
1…56  
N/  
1…56  
2…56  
3…56  
2…56  
3…56  
N/  
Alternate (SeeNote 1)  
Alternate (See Note 1)  
EVAPORATOR COIL  
Tube  
3/8 OD, Copper Tubes, Aluminum Fin  
Prime  
Qty Rows…Fin Spacing  
Face Area  
Fins/Inch  
Sq Ft  
2…14.4  
5
3…14.4  
5
3…12.5  
7.3  
8.5  
RETURN AIR FILTERS  
Qty…Size  
Factory Supplied, Cleanable  
2…16 x 25 x 1 4…16 x 20 x 1  
Inches  
CONDENSER CONNECTIONS (90MA ONLY)  
Water Inlet (bottom)  
Water Outler (top)  
Inches FPT  
Inches FPT  
1/2  
1/2  
3/4  
3/4  
1
1
1
1
Maximum Working Pressure (Refrigerant Side) PSIG  
400  
3/4  
CONDENSATE DRAIN CONNECTIONS  
Inches FPT  
ACCESSORY ELECTRIC HEAT  
Capacity @ 460 volts  
Watts  
Watts  
5.25  
4.03  
1
17.5  
13.4  
2
Capacity @ 400 volts  
Number of Electric Heat Stages  
LEGEND  
FPT = Female Pipe Thread MPT = Male Pipe Thread ODF = Outside Diameter Female  
NOTES:  
1. Motors other than those furnished with unit must be purchased separately. Contact your Carrier Marine representative  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 3  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TABLE 1C - 90MA/MU PHYSICAL DATA – R-404A , ENGLISH UNITS (See Table 2C for SI units)  
BASE UNIT (90MA/MU)  
NOMINAL CAPACITY  
REFRIGERANT  
UNITS  
Tons  
504  
3
506  
5
508  
7.5  
512  
10  
R-  
OPERATING WEIGHT  
Base unit 90MA  
Pounds  
Pounds  
Pounds  
390  
330  
25  
427  
360  
25  
895  
835  
50  
950  
890  
50  
Base Unit 90MU  
Discharge Plenum  
COMPRESSOR TYPE  
Qty Cylinders  
Qty Unloading Cylinders  
Qty Capacity Steps  
DISCHARGE PRESSURE SWITCH  
Opens (90MA)  
Scroll  
N/  
N/  
Semi-Hermetic, Recip  
4
0
1
6
2
2
1
PSIG  
PSIG  
PSIG  
PSIG  
395+/-10  
295+/-10  
426+/-7  
Closes (90MA)  
Opens (90MU)  
Closes (90MU)  
320+/-20  
SUCTION PRESSURE SWITCH  
Opens  
PSIG  
PSIG  
27+/-4  
67+/-4  
Closes  
REFRIGERANT  
Typ  
R-  
Qty (90MA ONLY))  
CONDENSER (90MA ONLY)  
Number...Type  
Pounds  
Gallons  
3.1  
5.3  
11.2  
10.0  
1…Tube in Tube  
0.86  
Water Volume  
0.39  
2.42  
EVAPORATOR AIR FAN  
Nominal Flow  
Adjustable, Belt Driven Centrifugal: 1750 RPM Motor @ 60hz  
CFM  
RPM  
RPM  
Inches  
Inches  
1200  
2000  
3000  
4000  
Standard Speed Range  
Maximum Allowable Speed  
Belt Qty/Pulley Pitch Diameter  
Motor Pulley Pitch Diameter Range  
Motor Nominal Rating (@ 60Hz)…Frame Size  
Standard  
647-915  
647-915  
487-690  
591-838  
1250  
1 / 6.4  
1 / 6.4  
1 / 8.5  
1 / 7.0  
2.4 to 3.4 inches  
HP  
HP  
HP  
1/3…56  
3/4…56  
N/  
3/4…56  
1…56  
N/  
1…56  
2…56  
3…56  
2…56  
3…56  
N/  
Alternate (SeeNote 1)  
Alternate (See Note 1)  
EVAPORATOR COIL  
Tube  
3/8 OD, Copper Tubes, Aluminum Fin  
Prime  
Qty Rows…Fin Spacing  
Face Area  
Fins/Inch  
Sq Ft  
2…14.4  
5
3…14.4  
5
3…12.5  
7.3  
8.5  
RETURN AIR FILTERS  
Qty…Size  
Factory Supplied, Cleanable  
2…16 x 25 x 1 4…16 x 20 x 1  
Inches  
CONDENSER CONNECTIONS (90MA ONLY)  
Water Inlet (bottom)  
Water Outler (top)  
Inches FPT  
Inches FPT  
1/2  
1/2  
3/4  
3/4  
1
1
1
1
Maximum Working Pressure (Refrigerant Side) PSIG  
400  
3/4  
CONDENSATE DRAIN CONNECTIONS  
Inches FPT  
ACCESSORY ELECTRIC HEAT  
Capacity @ 460 volts  
Watts  
Watts  
5.25  
4.03  
1
17.5  
13.4  
2
Capacity @ 400 volts  
Number of Electric Heat Stages  
LEGEND  
FPT = Female Pipe Thread MPT = Male Pipe Thread ODF = Outside Diameter Female  
NOTES:  
1. Motors other than those furnished with unit must be purchased separately. Contact your Carrier Marine representative  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 4  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TABLE 2A - 90MA/MU PHYSICAL DATA – R-134A , SI UNITS  
BASE UNIT (90MA/MU)  
NOMINAL CAPACITY  
REFRIGERANT  
UNITS  
kW  
308  
19.3  
312  
28.1  
R-  
OPERATING WEIGHT  
Base unit 90MA  
kg  
kg  
kg  
406  
N/  
22.7  
431  
N/  
22.7  
Base Unit 90MU  
Discharge Plenum  
COMPRESSOR TYPE  
Qty Cylinders  
Qty Unloading Cylinders  
Qty Capacity Steps  
DISCHARGE PRESSURE SWITCH  
Opens (90MA)  
Semi-Hermetic, Recip  
4
0
1
6
2
2
kPa  
kPa  
kPa  
kPa  
2310+/-69  
1620+/-138  
Closes (90MA)  
Opens (90MU)  
Closes (90MU)  
N/  
N/  
SUCTION PRESSURE SWITCH  
Opens  
kPa  
kPa  
48+/-12  
152+/-35  
Closes  
REFRIGERANT  
Typ  
R-  
Qty (90MA ONLY))  
kg  
5.1  
4.5  
CONDENSER (90MA ONLY)  
Number...Type  
1…Tube in Tube  
9.2  
Water Volume  
Liter  
EVAPORATOR AIR FAN  
Nominal Flow  
Adjustable, Belt Driven Centrifugal:1750 RPM Motor @60hz  
m3/hr  
RPM  
RPM  
cm  
4245  
5660  
Standard Speed Range  
Maximum Allowable Speed  
Belt Qty/Pulley Pitch Diameter  
Motor Pulley Pitch Diameter Range  
Motor Nominal Rating (@ 60Hz)…Frame Size  
Standard  
402-570  
488-692  
1250  
1 / 21.6  
1 / 17.8  
cm  
6.1 to 8.6 cm  
kW  
kW  
kW  
0.75…56  
1.5…56  
2.2…56  
1.5…56  
2.2…56  
N/  
Alternate (SeeNote 1)  
Alternate (See Note 1)  
EVAPORATOR COIL  
Tube  
3/8 OD, Copper Tubes, Aluminum Fin  
Prime  
3…4.9  
Qty Rows…Fin Spacing  
Face Area  
Fins/cm  
m2  
0.68  
0.79  
RETURN AIR FILTERS  
Qty…Size  
Factory Supplied, Cleanable  
cm  
4…40.6 x 50.8 x 2.5  
CONDENSER CONNECTIONS (90MA ONLY)  
Water Inlet (bottom)  
Water Outler (top)  
Maximum Working Pressure (Refrigerant Side)  
CONDENSATE DRAIN CONNECTIONS  
ACCESSORY ELECTRIC HEAT  
Capacity @ 460 volts  
Capacity @ 400 volts  
Number of Electric Heat Stages  
Inches FPT  
Inches FPT  
kPa  
1
1
1
1
2758  
3/4  
Inches FPT  
kW  
kW  
17.5  
13.4  
2
LEGEND  
FPT = Female Pipe Thread MPT = Male Pipe Thread ODF = Outside Diameter Female  
NOTES:  
1. Motors other than those furnished with unit must be purchased separately. Contact your Carrier Marine representative  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 5  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TABLE 2B - 90MA/MU PHYSICAL DATA – R-407C , SI UNITS  
BASE UNIT (90MA/MU)  
NOMINAL CAPACITY  
REFRIGERANT  
UNITS  
kW  
404  
10.5  
406  
17.6  
408  
26.4  
412  
35.1  
R-407C  
OPERATING WEIGHT  
Base unit 90MA  
kg  
kg  
kg  
177  
150  
11.3  
194  
163  
11.3  
406  
379  
22.7  
431  
404  
22.7  
Base Unit 90MU  
Discharge Plenum  
COMPRESSOR TYPE  
Qty Cylinders  
Qty Unloading Cylinders  
Qty Capacity Steps  
DISCHARGE PRESSURE SWITCH  
Opens (90MA)  
Scroll  
N/  
N/  
Semi-Hermetic, Recip  
4
0
1
6
2
2
1
kPa  
kPa  
kPa  
kPa  
2725+/-69  
2034+/-138  
2937+/-48  
2206+/-138  
Closes (90MA)  
Opens (90MU)  
Closes (90MU)  
SUCTION PRESSURE SWITCH  
Opens  
kPa  
kPa  
186+/-28  
462+/-48  
Closes  
REFRIGERANT  
Typ  
R-407C  
Qty (90MA ONLY))  
kg  
1.4  
2.4  
5.1  
4.5  
CONDENSER (90MA ONLY)  
Number...Type  
1…Tube in Tube  
3.3  
Water Volume  
Liter  
1.48  
9.2  
EVAPORATOR AIR FAN  
Nominal Flow  
Adjustable, Belt Driven Centrifugal: 1750 RPM Motor@60hz  
m3/hr  
RPM  
RPM  
cm  
1698  
2830  
4245  
5660  
Standard Speed Range  
Maximum Allowable Speed  
Belt Qty/Pulley Pitch Diameter  
Motor Pulley Pitch Diameter Range  
Motor Nominal Rating (@ 60Hz)…Frame Size  
Standard  
534-757  
534-757  
402-570  
488-692  
1250  
1 / 16.3  
1 / 16.3  
1 / 21.6  
1 / 17.8  
cm  
6.1 to 8.6 cm  
kW  
kW  
kW  
0.25…56  
0.56…56  
N/  
0.56…56  
0.75…56  
N/  
0.75…56  
1.5…56  
2.2…56  
1.5…56  
2.2…56  
N/  
Alternate (SeeNote 1)  
Alternate (See Note 1)  
EVAPORATOR COIL  
Tube  
3/8 OD, Copper Tubes, Aluminum Fin  
Prime  
Qty Rows…Fin Spacing  
Face Area  
Fins/cm  
m2  
2…5.7  
0.46  
3…5.7  
0.46  
3…4.9  
0.68  
0.79  
RETURN AIR FILTERS  
Qty…Size  
Factory Supplied, Cleanable  
2…40.6 x 63.5 x 2.5 4…40.6 x 50.8 x 2.5  
cm  
CONDENSER CONNECTIONS (90MA ONLY)  
Water Inlet (bottom)  
Water Outler (top)  
Maximum Working Pressure (Refrigerant Side)  
CONDENSATE DRAIN CONNECTIONS  
ACCESSORY ELECTRIC HEAT  
Capacity @ 460 volts  
Capacity @ 400 volts  
Number of Electric Heat Stages  
Inches FPT  
Inches FPT  
kPa  
1/2  
1/2  
3/4  
3/4  
1
1
1
1
2758  
3/4  
Inches FPT  
kW  
kW  
5.25  
4.03  
1
17.5  
13.4  
2
LEGEND  
FPT = Female Pipe Thread MPT = Male Pipe Thread ODF = Outside Diameter Female  
NOTES:  
1. Motors other than those furnished with unit must be purchased separately. Contact your Carrier Marine representative  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 6  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TABLE 2C - 90MA/MU PHYSICAL DATA – R-404A , SI UNITS  
BASE UNIT (90MA/MU)  
NOMINAL CAPACITY  
REFRIGERANT  
UNITS  
kW  
504  
10.5  
506  
17.6  
508  
26.4  
512  
35.1  
R-  
OPERATING WEIGHT  
Base unit 90MA  
kg  
kg  
kg  
177  
150  
11.3  
194  
163  
11.3  
406  
379  
22.7  
431  
404  
22.7  
Base Unit 90MU  
Discharge Plenum  
COMPRESSOR TYPE  
Qty Cylinders  
Qty Unloading Cylinders  
Qty Capacity Steps  
DISCHARGE PRESSURE SWITCH  
Opens (90MA)  
Scroll  
N/  
N/  
Semi-Hermetic, Recip  
4
0
1
6
2
2
1
kPa  
kPa  
kPa  
kPa  
2725+/-69  
2034+/-138  
2937+/-48  
2206+/-138  
Closes (90MA)  
Opens (90MU)  
Closes (90MU)  
SUCTION PRESSURE SWITCH  
Opens  
kPa  
kPa  
186+/-28  
462+/-48  
Closes  
REFRIGERANT  
Typ  
R-  
Qty (90MA ONLY))  
kg  
1.4  
2.4  
5.1  
4.5  
CONDENSER (90MA ONLY)  
Number...Type  
1…Tube in Tube  
3.3  
Water Volume  
Liter  
1.48  
9.2  
EVAPORATOR AIR FAN  
Nominal Flow  
Adjustable, Belt Driven Centrifugal: 1750 RPM Motor@60hz  
m3/hr  
RPM  
RPM  
cm  
1698  
2830  
4245  
5660  
Standard Speed Range  
Maximum Allowable Speed  
Belt Qty/Pulley Pitch Diameter  
Motor Pulley Pitch Diameter Range  
Motor Nominal Rating (@ 60Hz)…Frame Size  
Standard  
534-757  
534-757  
402-570  
488-692  
1250  
1 / 16.3  
1 / 16.3  
1 / 21.6  
1 / 17.8  
cm  
6.1 to 8.6 cm  
kW  
kW  
kW  
0.25…56  
0.56…56  
N/  
0.56…56  
0.75…56  
N/  
0.75…56  
1.5…56  
2.2…56  
1.5…56  
2.2…56  
N/  
Alternate (SeeNote 1)  
Alternate (See Note 1)  
EVAPORATOR COIL  
Tube  
3/8 OD, Copper Tubes, Aluminum Fin  
Prime  
Qty Rows…Fin Spacing  
Face Area  
Fins/cm  
m2  
2…5.7  
0.46  
3…5.7  
0.46  
3…4.9  
0.68  
0.79  
RETURN AIR FILTERS  
Qty…Size  
Factory Supplied, Cleanable  
2…40.6 x 63.5 x 2.5 4…40.6 x 50.8 x 2.5  
cm  
CONDENSER CONNECTIONS (90MA ONLY)  
Water Inlet (bottom)  
Water Outler (top)  
Maximum Working Pressure (Refrigerant Side)  
CONDENSATE DRAIN CONNECTIONS  
ACCESSORY ELECTRIC HEAT  
Capacity @ 460 volts  
Capacity @ 400 volts  
Number of Electric Heat Stages  
Inches FPT  
Inches FPT  
kPa  
1/2  
1/2  
3/4  
3/4  
1
1
1
1
2758  
3/4  
Inches FPT  
kW  
kW  
5.25  
4.03  
1
17.5  
13.4  
2
LEGEND  
FPT = Female Pipe Thread MPT = Male Pipe Thread ODF = Outside Diameter Female  
NOTES:  
1. Motors other than those furnished with unit must be purchased separately. Contact your Carrier Marine representative  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 7  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Step 4 - 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 in. per  
linear ft in any direction.  
Step 5 - Install Accessory Plenum (If Supplied) - Use  
plenum as template to mark hole locations in top panel. Drill  
0.154-in. holes in top panel at marked locations and attach  
plenum with screws supplied.  
FIGURE 1 - BASE UNIT INTERIOR DETAILS  
(TYPICAL UNIT SHOWN)  
UNIT  
A
B
*04  
*06  
*08,*12  
36.13(918)  
21.63(549)  
59.25(1505)  
48.26(1226)  
29.88(759)  
72.00(1828)  
C
D
E
SEE NOTE 2  
24(51)  
F
G
H
11.25(286)  
13.00 (330)  
0.75(19)  
13.50(343)  
15.50(394)  
0.75(19)  
15.63(397)  
18.38(466)  
1.00 (25)  
J
K
L
M
11.59(294)  
10.34(263)  
11.37(289)  
24.20(615)  
25.50(646)  
17.11(435)  
17.13(435)  
20.38(519)  
17.11(435)  
NOTES:  
1. Certified dimension drawings available upon request  
2. Minimum required clearance at back of unit is zero.  
Clearance above and at right (90MA*08,*12 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 *04 & *06,  
and on both sides of unit for *08 & *12.  
FIGURE 2 - UNIT DIMENSIONS  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 8  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Step 7 - Install Ventilation-Air Ductwork (If required)-  
Connect ventilation ducts to flanges on outside-air supply  
opening (Figure. 2) using a flexible connection. Attach  
ductwork to ship structure, insulate and cover with 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.  
Step 8 - Check Return-Air Filters - Ensure filters shipped  
with unit are in place. Never operate unit without return air  
filters in place.  
Step 9 - Check Compressor Spring Mounts (*08 & *12  
size only) - 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.  
The compressors have reversible oil pumps that  
operate in either direction; therefore, the direction of  
rotation need not be checked.  
DIMENSION “D” MUST BE  
EQUAL ALL AROUND  
FIGURE 3 - HORIZONTAL WHEEL CENTERING  
Step 10 - Make Condenser Connections  
UNIT MOUNTED 90MA UNITS- Piping arrangements for  
condenser cooling water are shown in Figure. 5.  
Condensers have water inlet and outlet connections as  
shown in Figure 6.  
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 6. Observe all applicable plumbing and sanitary  
codes.  
FIGURE 4 - CONCENTRIC WHEEL ALIGNMENT  
Step 6 – Check Fan Shaft and Wheel Alignment-  
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 possible to re-bend bearing support arms to original  
positions. Replace the bearing support if it has been  
extensively damaged during shipping.  
FIGURE 5 - TYPICAL CONDENSER WATER PIPING  
Install water-regulating valve in water supply line  
outside cabinet as follows.  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 9  
Download from Www.Somanuals.com. All Manuals Search And Download.  
a. Route regulating valve capillary with its flare nut to the  
fitting 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  
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.  
90MU UNITS-Install remote mounted condenser in  
accordance with the installation instructions provided with  
condenser. Recommended line sizes are given in Table 3.  
Additional instructions can be found in Carrier System  
Design Manual, Part 3, for standard refrigeration piping  
techniques. On *08 and *12 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 “Service, Charging The  
System”.  
A = Condensate, ¾ inch Female Pipe Thread,  
B = Electrical Opening,  
C = Condenser In, 1 inch FPT,  
D = Condenser Out, 1 Inch FPT  
FIGURE 6 - CONNECTION LOCATIONS  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 10  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TABLE 3 - RECOMMENDED LINE SIZES (INCHES) REMOTE CONDENSERS  
LENGTH OF RUN  
UNIT  
REFRIGERANT  
90MU  
TYPE  
0-25  
LIQUID  
26-50  
51-75  
76-100  
DISCH  
1/2  
5/8  
3/4  
7/8  
5/8  
3/4  
7/8  
7/8  
DISCH  
LIQUID  
3/8  
DISCH  
LIQUID  
3/8  
DISCH  
LIQUID  
3/8  
404  
406  
408  
412  
504  
506  
508  
512  
R-407C  
R-407C  
R-407C  
R-407C  
R-404A  
R-404A  
R-404A  
R-404A  
3/8  
3/8  
1/2  
1/2  
3/8  
1/2  
1/2  
5/8  
5/8  
3/4  
3/4  
7/8  
5/8  
3/4  
7/8  
1-1/8  
5/8  
3/4  
7/8  
7/8  
3/4  
7/8  
1-1/8  
1-1/8  
5/8  
3/4  
7/8  
3/8  
1/2  
1/2  
3/8  
1/2  
1/2  
5/8  
3/8  
1/2  
1/2  
3/8  
1/2  
1/2  
5/8  
3/8  
1/2  
5/8  
3/8  
1/2  
5/8  
5/8  
1-1/8  
3/4  
7/8  
1-1/8  
1-1/8  
* Recommended line sizes correspond to 2 degree F drop.  
NOTES:  
1. Pipe sizes should never be smaller than cooling unit connection size.  
2. Table is based on 2 degree F drop over entire length. Excessive (more than a few) elbows  
and fittings will significantly affect pressure drop. If this situation exists, line sizing must be re-  
calculated.  
Step 11 - Install Unit 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.  
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.  
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.  
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.  
FIGURE 7 - CONDENSATE DRAIN TRAP  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 11  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Step 12 - Make Electrical Connections  
OPERATION  
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.  
CAUTION  
Compressor crankcase heater must be  
energized for 24 hours prior to startup to  
prevent compressor bearing damage.  
POWER WIRING - Conduit opening for all units is on left  
side of unit near control box. Connect field power wires at  
the compressor contactor.  
To start unit:  
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.  
1. Thoroughly inspect exterior of unit. Clean and dust up  
debris, then wash with mild soap and water solution.  
2. On 90MA*08 &*12 units, ensure compressor  
discharge, suction and liquid service valves are open.  
(Refer to “Operation - Service Valves.) 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.  
3. 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.  
4. 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 (Tables 1A/B/C/2A/B/C)  
and rotation (Figure 1). If fan requires adjustment, refer  
to “Service, Evaporator-Fan Adjustment”.  
5. 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  
“Service, Water Regulating Valve.)  
6. Set thermostat for comfort as desired.  
To Shut Down Unit:  
1. 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 “Service, Crankcase Heater”).  
2. If unit is to be used for winter heating, set selector  
switch at HEAT position and re-set thermostat at  
desired setting.  
3. If unit may be exposed to freezing 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 12  
(90MA*04/*06) or figure 14 (90MA*08/*12).  
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.  
Service Valves - Always ensure that compressor suction,  
and discharge service valves and liquid service valve are  
open before operating unit.  
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.  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 12  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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  
1. Sharp edges of coil fins are exposed. To  
prevent injury, cover top of evaporator  
with cardboard or a few layers of heavy  
tape.  
2. 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). Check for  
refrigerant leaks.  
FIGURE 8 - FAN PULLEY ADJUSTMENT  
6. Check pulley alignment and belt tension adjustment as  
described below.  
7. Check fan operation. Repeat above procedure as  
required.  
Return-Air Grille Removal  
1. Pull grille out from top.  
2. Pull grille up to release hinge pins from lower panel.  
3. To reassemble, reverse procedure.  
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).  
Access Panel Removal - Remove return-air grille as  
described above.  
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 (approxi-  
mately 3/4-in. deflection with 8-pound tension at midpoint  
of belt span).  
Remove the panel fastening screws now exposed.  
TOP PANEL - Pull out and down.  
BOTTOM - Pull out and up.  
Evaporator Fan Adjustment - Observe fan compartment  
Caution note above. The fan motor pulleys are factory set  
at the fan speeds listed in Table 1.  
Lubrication - Fan motor and fan shaft bearings are  
lubricated for the life of the bearings. No re-lubrication is  
required  
TO CHANGE FAN SPEED  
1. Shut off unit power supply.  
Return-Air Filters - Inspect filters twice monthly and clean  
as required by operating conditions. Filter size and type  
are listed in Tables 1A/B/C/2A/B/C. 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.  
2. Loosen fan belt by loosening fan motor from mounting  
bracket. Do not loosen fan motor mounting bracket  
from unit.  
3. Loosen movable pulley flange set screw (Figure. 8).  
4. 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 (Tables  
1A/B/C/2A/B/C) or motor full load amps indicated on  
motor nameplate.  
Do not operate unit without return-air filters in place.  
Condensate Drains - 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. Set movable flange set screw at nearest flat of pulley  
hub and tighten set screw.  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 13  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Evaporator Coil - Observe fan compartment Caution note  
at the beginning of the Service section.  
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 to Tables 1A/B/C/2A/B/C for coil  
fins/inch) when straightening mashed or bent coil fins.  
Water Regulating Valve  
PREPARATION FOR OPERATION.  
1. Open the water regulating valve inlet and outlet  
isolation valves.  
2. Close the water regulating valve bypass valve.  
ADJUSTMENT  
NOTE: Adjustments to the water regulating  
valve must be made slowly, allowing ample  
time for response and stabilization.  
FIGURE 9 - GRAVITY FLOW METHOD  
1. The compressor discharge pressure is controlled by  
the water regulating valve and may be monitored by  
observing liquid line pressure.  
2. Install a calibrated gauge at the liquid line service port.  
FOR 90MA: Operating liquid line range for R-407C  
units is 200 to 215 psig, operating range for R-404A  
units is 240 to 260 psig, operating range for R-134a  
units is 122 to 130 psig.  
GRAVITY FLOW METHOD (Figure. 9) -  
1. Disconnect condenser piping at unit, including isolation  
valves and water regulating valve.  
2. Fill condenser as shown in figure 9. Follow acid  
manufacturer's instructions. When condenser is full,  
allow solution to remain overnight  
3. Drain condenser and flush with clean water.  
FOR 90MU : Operating liquid line range for R-407C  
units is 265 to 285 psig, operating range for R-404A  
units is 290 to 315 psig, If pressure reading is below  
operating range, rotate the square head adjusting  
screw counterclockwise; this will increase 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.  
FORCED CIRCULATION METHOD (Figure. 10) -  
1. Disconnect condenser piping at unit, including isolation  
valves and water regulating valve.  
2. 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.  
3. 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.  
4. Drain condenser and flush with clean water.  
3. 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.  
Condenser - Condensers may require cleaning of water-  
deposited scale.  
CAUTION  
Follow all Safety codes. Wear safety glasses  
and rubber gloves when using inhibited  
hydrochloric acid solution.  
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.  
FIGURE 10 - FORCED CIRCULATION METHOD  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 14  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Charging the System (90MA) - 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.  
If unit has partial charge, it must be recharged by  
removing existing charge and recharging by weighing in  
the required amount of refrigerant. (Refer to Table  
1A/B/C/2A/B/C)  
Evaporator-Fan Motor Removal - Motor power wires  
need not be disconnected from motor terminals before  
motor is removed from unit.  
1. 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.  
Charging the System (90MU)  
UNIT SIZES 90MU Units - These units, used with remote  
condensers, are shipped with a holding charge only. To  
charge:  
CAUTION  
Before attempting to remove fan motors or  
motor mounts, place a piece of plywood over  
evaporator coils to prevent coil damage.  
1. Open discharge and liquid service valves.  
2. Leak test, reclaim refrigerant and evacuate.  
3. Using standard refrigerant charging techniques and  
subcooling charts (Figure 11) add refrigerant as required  
to maintain proper operating conditions. Subcooling is  
determined by subtracting the actual temperature entering  
the TXV from the saturated temperature entering the TXV.  
2. Loosen motor hold down bolts on mounting bracket so  
that fan belt can be removed.  
3
Loosen but do not remove the 2 motor mounting  
bracket bolts on left side of bracket.  
4
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.  
IMPORTANT: Charge on both the HIGH and LOW side  
simultaneously of idle compressors to prevent axial  
loading of the scroll, which may cause a temporary no  
start condition for the compressor. If this occurs, leave  
the system off for approximately 30 minutes. Attempt  
to restart the compressor; internal pressures should  
equalize enough to allow compressor to start.  
If removing the compressor, evacuate both the HIGH  
and LOW side simultaneously.  
Pressure Relief Device - All units are equipped with a  
fusible-plug type safety relief device an the refrigerant  
tubing. The relief setting is 197 °F to 203 °F on all units.  
Crankcase Heater - A Crankcase heater is supplied on  
90MA,MU*08 and *12 size 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”.  
R407C PRESSURE AT LIQUID LINE SERVICE VALVE PSIG  
137 149 162 176 205 222 239 256 275 295 315 336 359  
Required  
Subcooling (ºF)  
0
5
10  
15  
20  
25  
70  
65  
60  
55  
50  
45  
75  
70  
65  
60  
55  
50  
80  
75  
70  
65  
60  
55  
85  
80  
75  
70  
65  
60  
90  
85  
80  
75  
70  
65  
95 100 105 110 115 120 125 130  
90  
85  
80  
75  
70  
95 100 105 110 115 120 125  
90  
85  
80  
75  
95 100 105 110 115 120  
90  
85  
80  
95 100 105 110 115  
90  
85  
95 100 105 110  
90 95 100 105  
Required  
Subcooling (ºF)  
R404A PRESSURE AT LIQUID LINE SERVICE VALVE PSIG  
150 163 176 190 205 221 237 255 273 292 313 334 356  
0
5
10  
15  
20  
25  
70  
65  
60  
55  
50  
45  
75  
70  
65  
60  
55  
50  
80  
75  
70  
65  
60  
55  
85  
80  
75  
70  
65  
60  
90  
85  
80  
75  
70  
65  
95 100 105 110 115 120 125 130  
90  
85  
80  
75  
70  
95 100 105 110 115 120 125  
90  
85  
80  
75  
95 100 105 110 115 120  
90  
85  
80  
95 100 105 110 115  
90  
85  
95 100 105 110  
90 95 100 105  
Cycle-LocTM- 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.  
Required  
Subcooling (ºC)  
R407C PRESSURE AT LIQUID LINE SERVICE VALVE kPa  
1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300  
0
3
5
7
10  
13  
23  
20  
18  
16  
13  
10  
26  
23  
21  
19  
16  
13  
29  
26  
24  
22  
19  
16  
32  
29  
27  
25  
22  
19  
34  
31  
29  
27  
24  
21  
37  
34  
32  
30  
27  
24  
39  
36  
34  
32  
29  
26  
42  
39  
37  
35  
32  
29  
44  
41  
39  
37  
34  
31  
46  
43  
41  
39  
36  
33  
48  
45  
43  
41  
38  
35  
50  
47  
45  
43  
40  
37  
52  
49  
47  
45  
42  
39  
Required  
Subcooling (ºC)  
R404A PRESSURE AT LIQUID LINE SERVICE VALVE kPa  
1190 1288 1392 1503 1580 1701 1786 1918 2011 2107 2206 2308 2414  
0
3
5
7
10  
13  
23  
20  
18  
16  
13  
10  
26  
23  
21  
19  
16  
13  
29  
26  
24  
22  
19  
16  
32  
29  
27  
25  
22  
19  
34  
31  
29  
27  
24  
21  
37  
34  
32  
30  
27  
24  
39  
36  
34  
32  
29  
26  
42  
39  
37  
35  
32  
29  
44  
41  
39  
37  
34  
31  
46  
43  
41  
39  
36  
33  
48  
45  
43  
41  
38  
35  
50  
47  
45  
43  
40  
37  
52  
49  
47  
45  
42  
39  
Discharge and Suction Pressure Switches - Refer to  
Table 1 for opening and closing settings for these safety  
devices.  
The discharge pressure switch is located on the  
compressor on 06DA compressor equipped units and on  
the discharge line on all other units. The suction pressure  
switch is located on top of the compressor on 06DA  
FIGURE 11 - CHARGING CHARTS  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A. 90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
compressor equipped units and on the suction line on all  
other units.  
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-407C, R-404A, and R-134a units  
Castrol - Icematic SW68  
ICI - Emkarate RL68HP  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A.  
90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 16  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR NOTES AND LEGEND, SEE FIGURE 13  
FIGURE 12 WIRING SCHEMATIC - 90MA/MU*04/*06  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A.  
90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 17  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FIGURE 13 COMPONENT ARRANGEMENT - 90MA/MU*04/*06  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A.  
90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 18  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR NOTES AND LEGEND, SEE FIGURE 15  
FIGURE 14 - ELECTRICAL SCHEMATIC - 90MA/MU*08/*12  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A.  
90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 19  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FIGURE 15 - COMPONENT ARRANGEMENT - 90MA/MU008/012  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A.  
90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 20  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FIGURE 16 – MOUNTING BASE ASSEMBLY – 90MA/MU*04/*06  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A.  
90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 21  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FIGURE 17 – MOUNTING BASE ASSEMBLY – 90MA/MU*08/*12  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations  
Printed in U.S.A.  
90MA-3SI SUPERCEDES FORM 62-02971-00 09-2009  
Pg 22  
Download from Www.Somanuals.com. All Manuals Search And Download.  

Black Decker Power Screwdriver BDCS40G User Manual
Black Decker Saw 612872 00 User Manual
Blue Rhino Insect Control Equipment CPSV003589 User Manual
Cambridge Audio Car Amplifier 550A User Manual
Cambridge SoundWorks Portable Speaker PCWorks Speaker System User Manual
Canon Fax Machine B160 User Manual
Casio Digital Camera EX S770 User Manual
Casio Watch MA0702 B User Manual
Chevrolet Automobile 2010 Tahoe Hybrid User Manual
Christie Digital Systems Projector LW400 User Manual