Manitowoc QY0874C

–141–
Discharge Pressure High Checklist
Problem
 Cause
Improper Installation
 Refer to “Installation/Visual Inspection Checklist”
Condenser Restriction
 High inlet air temperature
 Condenser discharge air recirculation
 Dirty condenser fins
 Defective fan cycling control (CVD0675/CVD1476
does not use a fan cycle control)
 Defective fan motor
Improper Refrigerant Charge
 Overcharged
 Non-condensable in system
 Wrong type of refrigerant
Other
 Non-Manitowoc components in system
 High side refrigerant lines/component
 Restricted (before mid-condenser)
 Defective head pressure control valve
 Water Inlet Valve is incorrectly adjusted (CVD1476
only)
NOTE: Do not limit your diagnosis to only the items
listed in the checklists.