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T-359
6–2
Refrigeration system
Shortage of refrigerant
Evaporator coil covered with ice
Evaporator coil plugged with debris
Evaporator fan(s) rotating backwards
Air bypass around evaporator coil
Check
Controller set too low
Reset
Compressor service valves or liquid line
shutoff valve partially closed
Open valves
completely
Dirty condenser
Compressor worn
Current limit (function code Cd32) set to wrong value
Economizer solenoid valve malfunction
Digital unloader valve stuck open
Replace
Electronic expansion valve
Replace
6.3
UNIT RUNS BUT HAS INSUFFICIENT COOLING
Refrigeration system
Abnormal pressures
Abnormal temperatures
Abnormal currents
Controller malfunction
Evaporator fan or motor defective
Compressor service valves or liquid line
shutoff valve partially closed
Open valves
completely
Frost on coil
Digital unloader valve stuck open
Replace
Electronic expansion valve
Replace
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 thermostat open
CONDITION
POSSIBLE CAUSE
REMEDY/
REFERENCE
SECTION
Содержание 69NT40-561-019
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Страница 127: ...8 3 T 359 Figure 8 2 SCHEMATIC DIAGRAM Evergreen Unit Configuration ...
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