Part Number STH044 10/13 71
ANALYZING SUCTION PRESSURE
NOTE: Analyze discharge pressure before analyzing
suction pressure.
High or low discharge pressure may be causing high
or low suction pressure.
Suction Pressure High Checklist
Problem Cause
Improper
installation
Refer to “Installation/Visual Inspection
Checklist.”
Discharge
pressure
Discharge pressure is too high and is
affecting suction pressure. Refer to
“Discharge Pressure High Checklist.”
Improper
refrigerant
charge
Overcharged
Wrong type of refrigerant
Non condensible in system
Other
Dump valve leaking
Non-Manitowoc components in system
Expansion valve incorrectly adjusted
Defective compressor
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