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MAINTENANCE
crusader
MC-8
[ e.o,_1_6
-_3---=2E=------- DAIE_.c_Jo_nu_or--'--'-y,_1_97_5 _ ] ·
MANUAL
EXPANSION VALVE TROUBLESHOOTING
(Cont'd)
PROBABLE CAUSE
PROBABLE REMEDY
(HIGH SUCTION PRESSURE .... HIGH SUPERHEAT)
Compressor discharge valve leaking
Replace or repair valve
(HIGH SUCTION PRESSURE .... LOW SUPERHEAT)
Valve foperheat setting too low
Compressor discharge valves leaking
Adjust superheat as outlined under "Adjust-
ment (Superheat)"
Replace or repair discharge valve
(FLUCTUATING SUCTION PRESSURE)
Incorrect superheat adjustment
Adjust superheat to 8° - I 2°
(FLUCTUATING DISCHARGE PRESSURE)
insufficient charge
Add charge to system
(HIGH DISCHARGE PRESSURE)
Air or non-condensable gases in condenser
Overcharge of refrigerant
Condenser dirty
Insufficient cooling air distribution over air
cooled condenser
Purge and recharge system
Bleed to proper charge
Clean condenser
Properly locate condenser to freely dispel hot
discharge air.
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