3-4
INDICATION/
REFERENCE
TROUBLE
POSSIBLE CAUSES
SECTION
3.11 THERMOSTATIC EXPANSION VALVE MALFUNCTION
Low suction
Low refrigerant charge
4.4/4.6
pressure with high
External equalizer line plugged
Open
superheat
Wax, oil or dirt plugging valve or orifice
4.26
Ice formation at valve seat
4.4/4.6
Superheat too high
4.26.c
Power assembly failure
4.26
Loss of element/bulb charge
4.26
Broken capillary
4.26
Foreign material in valve
High suction
Superheat setting too low
4.26.c
pressure with low
External equalizer line plugged
Open
superheat
Ice holding valve open
4.4/4.5
Foreign material in valve
4.26
Liquid slugging in
Pin and seat of expansion valve eroded or
compressor
held open by foreign material
4.26
Fluctuating suction
Improper bulb location or installation
4.26
pressure
Low superheat setting
4.26.c
3.12 POWER AUTOTRANSFORMER MALFUNCTION
Unit will not start
Circuit breaker (CB-2) tripped
Check
Power transformer internal protector open
4.22
Power transformer defective
4.22
Power source not turned ON
Check
3.13 EVAPORATOR MOTOR TRANSFORMER MALFUNCTION
Unit will not start
Voltage switch (VS) not wired properly
Check
Evaporator motor transformer internal protector open
Check
Evaporator motor transformer defective
Check
Power source not turned ON
Check
3.14 WATER-COOLED CONDENSER OR WATER PRESSURE SWITCH MALFUNCTION
High discharge
Dirty coil
4.29
pressure
Noncondensibles
Condenser fan
Water pressure switch malfunction
Check
starts and stops
Water supply interruption
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Содержание 69NT40-489
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