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T-349
6–4
6.9
CONTROLLER MALFUNCTION
Will not control
Defective Sensor
Defective wiring
Check
Fuse (F1, F2) blown
Replace
Stepper motor suction modulation valve circuit malfunction
6.10 NO EVAPORATOR AIR FLOW OR RESTRICTED AIR FLOW
Evaporator coil blocked
Frost on coil
Dirty coil
No or partial evaporator air flow
Evaporator fan motor internal protector open
Evaporator fan motor(s) defective
Evaporator fan(s) loose or defective
Evaporator fan contactor defective
Replace
6.11 THERMOSTATIC EXPANSION VALVE MALFUNCTION
Low suction pressure
with high superheat
Low refrigerant charge
External equalizer line plugged
Open
Wax, oil or dirt plugging valve or orifice ice formation at valve seat
Superheat too high
Power assembly failure
Loss of element/bulb charge
Broken capillary
Foreign material in valve
High suction pressure
with low superheat
Superheat setting too low
External equalizer line plugged ice holding valve open
Open
Foreign material in valve
Liquid slugging in compressor
Pin and seat of expansion valve eroded or held open by
foreign material
Fluctuating suction pressure
Improper bulb location or installation
Low superheat setting
6.12 AUTOTRANSFORMER MALFUNCTION
Unit will not start
Circuit breaker (CB-1 or CB-2) tripped
Check
Autotransformer defective
Power source not turned ON
Check
460 VAC power plug is not inserted into the receptacle
6.13 WATER-COOLED CONDENSER OR WATER PRESSURE SWITCH
High discharge pressure
Dirty coil
Noncondensibles
Condenser fan starts and stops
Water pressure switch malfunction
Check
Water supply interruption
Check
CONDITION
POSSIBLE CAUSE
REMEDY/
REFERENCE
SECTION
Содержание 69NT40-541-306
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Страница 78: ...T 354 5 8 Figure 5 3 Controller Operation Perishable Mode Figure 5 4 Controller Operation Frozen Mode ...
Страница 142: ...T 354 8 2 Figure 8 2 Schematic Diagram Standard Unit Configuration BASED ON 62 66686 00 ...
Страница 143: ...8 3 T 354 Figure 8 3 Unit Wiring Diagram Standard Unit Configuration 1 of 2 BASED ON 62 66686 00 ...
Страница 144: ...T 354 8 4 Figure 8 4 Unit Wiring Diagram Standard Unit Configuration 2 of 2 BASED ON 62 66686 00 ...
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