Abnormal Pressure, Heating; Abnormal Noise; Control System Malfunction; No Evaporator Air Flow Or Restricted Air Flow - Carrier Supra 950MT Operation & Service Manual

6.3.7

Abnormal Pressure, Heating

High discharge pressure
Low discharge pressure
Low suction pressure
High suction pressure
6.3.8

Abnormal Noise

Compressor
Condenser or evaporator fan
Compressor Drive System
6.3.9

Control System Malfunction

Will not control
6.3.10

No Evaporator Air Flow or Restricted Air Flow

Evaporator coil blocked
No or partial evaporator air
flow
Overcharged system
V-belts broken or loose
Non-condensibles or refrigerant overcharge
Main heat valve (MHV) malfunction
Hot gas valve (1HGV or 2HGV) malfunction
Compressor gaskets defective
Compressor valve(s) worn or broken
Main heat valve (MHV) malfunction
Low refrigerant charge
Low refrigerant charge
Compressor pressure regulating valve (CPR) malfunction
Suction service valve partially closed
Compressor valve(s) worn or broken
Compressor pressure regulating valve (CPR) not adjusted
properly
Compressor gaskets defective
Hot gas valve (1HGV or 2HGV) malfunction
Loose mounting bolts
Worn bearings
Worn or broken valves
Liquid slugging
Insufficient oil
Loose or striking shroud
Bearings defective
Bent shaft
V-belt cracked or worn
Clutch malfunction
Sensor defective
Relay(s) defective
Microprocessor controller malfunction
Frost on coil
Dirty coil
Fan motor(s) malfunction
V-belt broken or loose
Clutch defective
Evaporator fan loose or defective
Evaporator fan rotating backwards
Evaporator air flow blocked in trailer (box)
Fan motor(s) malfunction
6-5
5.4.1
5.3
Replace
Check
6.3.11
Check
5.8
Check
5.7
5.7
5.15
Open
Replace
Adjust
Replace
Check
Tighten
5.8
5.8
6.3.10
5.9
Check
Check
Check
5.3
Replace
5.18.2
Check
5.18
Check
5.14.1
Replace
5.3
Replace
Check
5.3
Check
Replace
62-11863