Manitowoc Q270 - Discharge Temperature Checklists; Checklist for High Discharge Temperature; Checklist for Low Discharge Temperature

Part Number STH039 8/13 63
Discharge temperature High Checklist
Improper Installation
• Refer to “Installation and Visual Inspection
Checklist” on page 52.
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 temperature Low
Checklist
Improper Installation
• Refer to “Installation and Visual Inspection
Checklist” on page 52.
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.