T-316
6–2
6.3
UNIT RUNS BUT HAS INSUFFICIENT COOLING
Compressor Compressor
valves
defective
Refrigeration System
Abnormal pressures
Controller malfunction
Evaporator fan or motor defective
Suction modulation valve malfunction
Condenser Pressure Transducer defective
Check
Shortage of refrigerant
6.4
UNIT WILL NOT HEAT OR HAS INSUFFICIENT HEATING
No operation of any
kind
Start-Stop switch OFF or defective
Check
Circuit breaker OFF or defective
Check
External power source OFF
Turn ON
No control power
Circuit breaker or fuse defective
Replace
Control Transformer defective
Replace
Evaporator fan internal motor protector open
Heat relay defective
Check
Heater termination switch open
Unit will not heat or has
insufficient heat
Heater(s) defective
Heater contactor or coil defective
Replace
Evaporator fan motor(s) defective or rotating backwards
Evaporator fan motor contactor defective
Replace
Controller malfunction
Defective wiring
Replace
Loose terminal connections
Tighten
Low line voltage
6.5
UNIT WILL NOT TERMINATE HEATING
Unit fails to stop heat-
ing
Controller improperly set
Reset
Controller malfunction
Heater termination thermostat remains closed along with the heat relay
6.6
UNIT WILL NOT DEFROST PROPERLY
Will not initiate defrost
automatically
Defrost timer malfunction (Cd27)
Loose terminal connections
Tighten/
Defective wiring
Replace
Defrost temperature sensor defective or heat termination thermostat open
Replace
Heater contactor or coil defective
Replace
Will not initiate
defrost manually
Manual defrost switch defective
Replace
Defrost temperature sensor open
Initiates but relay (DR)
drops out
Low line voltage
CONDITION
POSSIBLE CAUSE
REMEDY /
REFERENCE
Содержание 69NT40-541-001
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Страница 79: ...5 9 T 316 Figure 5 3 Controller Operation Perishable Mode Figure 5 4 Controller Operation Frozen Mode...
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Страница 144: ...T 316 8 6 Figure 8 5 SCHEMATIC DIAGRAM Emergency Bypass To ST10 To TRX2 To QC1 To QC1 To QC1 To MC6 CONTROLLER...
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