Carrier 69NT40-561-019, Руководство по эксплуатации и обслуживанию

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T-359 6–4
Low suction pressure
Incorrect software and/or controller configuration Check
Failed suction pressure transducer (SPT) or evaporator pressure
transducer (EPT)
Replace
Suction service valve partially closed Open
Filter drier partially plugged 7.8
Low refrigerant charge 7.3
No evaporator air flow or restricted air flow 7.9
Excessive frost on evaporator coil 6.6
Evaporator fan(s) rotating backwards 7.10.3
EEV control malfunction Replace
Failed digital unloader valve (DUV) Replace
Suction and discharge
pressures tend to equalize
when unit is operating
Compressor operating in reverse 6.12
Compressor cycling/stopped Check
Failed digital unloader valve (DUV) Replace
6.8 ABNORMAL NOISE OR VIBRATIONS
Compressor
Compressor start up after an extended shutdown
Normal
Brief chattering when manually shut down
Compressor operating in reverse 6.12
Loose mounting bolts or worn resilient mounts
Tighten/
Replace
Loose upper mounting 7.4.1
Liquid slugging 7.12
Condenser or
Evaporator Fan
Bent, loose or striking venturi Check
Worn motor bearings 7.7 / 7.10
Bent motor shaft 7.7 / 7.10
6.9 MICROPROCESSOR MALFUNCTION
Will not control
Incorrect software and/or controller configuration Check
Defective sensor 7.19
Defective wiring Check
Low refrigerant charge 7.3
6.10 NO EVAPORATOR AIR FLOW OR RESTRICTED AIR FLOW
Evaporator coil blocked
Frost on coil 6.6
Dirty coil 7.9
No or partial
evaporator air flow
Evaporator fan motor internal protector open 7.10
Evaporator fan motor(s) defective 7.10
Evaporator fan(s) loose or defective 7.10
Evaporator fan contactor defective Replace
CONDITION POSSIBLE CAUSE
REMEDY/
REFERENCE
SECTION