76 Part Number STH042 3/14
Discharge Pressure High Checklist
Improper Installation
• Refer to “Installation/Visual Inspection Checklist”
on page 64.
Restricted Condenser Air Flow
• High inlet air temperature
• Condenser discharge air re-circulation
• Dirty condenser fins
• Defective fan cycling 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)
Freeze Cycle Discharge Pressure Low Checklist
Improper Installation
• Refer to “Installation/Visual Inspection Checklist”
on page 64.
Improper Refrigerant Charge
• Undercharged
• Wrong type of refrigerant
Other
• Non-Manitowoc components in system
• High side refrigerant lines/component restricted
(before mid-condenser)
• Defective fan cycle control
NOTE: Do not limit your diagnosis to only the items
listed in the checklists.
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