Carrier 69NT40-541-505 Operation And Service Manual page 91

6.11 THERMOSTATIC EXPANSION VALVE MALFUNCTION
Condition
High suction pressure with low su-
perheat
Liquid slugging in compressor
Fluctuating suction pressure
6.12 AUTOTRANSFORMER MALFUNCTION
Condition
Unit will not start
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Possible Cause
Superheat setting too low
External equalizer line plugged ice holding valve open
Foreign material in valve
Pin and seat of expansion valve eroded or held open by for-
eign material
Improper bulb location or installation
Low superheat setting
Possible Cause
Circuit breaker (CB1 or CB2) tripped
Autotransformer defective
Power source not turned ON
460 VAC power plug is not inserted into the receptacle
search engine
6–5
Remedy/Refer-
ence Section
7.16
Open
7.16
7.16
7.16
7.16
Remedy/Refer-
ence Section
Check
7.19
Check
5.2.2
T-368