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6–5
T-368
High suction pressure with low su-
perheat
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 for-
eign material
Fluctuating suction pressure
Improper bulb location or installation
Low superheat setting
6.12 AUTOTRANSFORMER MALFUNCTION
Condition
Possible Cause
Remedy/Refer-
ence Section
Unit will not start
Circuit breaker (CB1 or CB2) tripped
Check
Autotransformer defective
Power source not turned ON
Check
460 VAC power plug is not inserted into the receptacle
6.11 THERMOSTATIC EXPANSION VALVE MALFUNCTION
Condition
Possible Cause
Remedy/Refer-
ence Section
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Summary of Contents for 69NT40-541-505
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