Carrier SUPRA 950Mt - Abnormal Pressure, Heating; Abnormal Noise; Control System Malfunction; No Evaporator Air Flow or Restricted Air Flow

6-5 62-11863
6.3.7 Abnormal Pressure, Heating
High discharge pressure 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
5.4.1
5.3
Replace
Check
6.3.11
Check
Low discharge pressure Compressor valve(s) worn or broken
Main heat valve (MHV) malfunction
Low refrigerant charge
5.8
Check
5.7
Low suction pressure Low refrigerant charge
Compressor pressure regulating valve (CPR) malfunction
Suction service valve partially closed
5.7
5.15
Open
High suction pressure Compressor valve(s) worn or broken
Compressor pressure regulating valve (CPR) not adjusted
properly
Compressor gaskets defective
Hot gas valve (1HGV or 2HGV) malfunction
Replace
Adjust
Replace
Check
6.3.8 Abnormal Noise
Compressor Loose mounting bolts
Worn bearings
Worn or broken valves
Liquid slugging
Insufficient oil
Tighten
5.8
5.8
6.3.10
5.9
Condenser or evaporator fan Loose or striking shroud
Bearings defective
Bent shaft
Check
Check
Check
Compressor Drive System V-belt cracked or worn
Clutch malfunction
5.3
Replace
6.3.9 Control System Malfunction
Will not control Sensor defective
Relay(s) defective
Microprocessor controller malfunction
5.18.2
Check
5.18
6.3.10 No Evaporator Air Flow or Restricted Air Flow
Evaporator coil blocked Frost on coil
Dirty coil
Fan motor(s) malfunction
Check
5.14.1
Replace
No or partial evaporator air
flow
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
5.3
Replace
Check
5.3
Check
Replace