Manitowoc MD0420A - Page 68

68 Part Number 040005626 5/17
Discharge Pressure High Checklist
Improper Installation
• Refer to “Installation/Visual Inspection Checklist”
on page 55.
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-condensible in system
• Wrong type of refrigerant
Other
• Non-OEM 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 55.
Improper Refrigerant Charge
• Undercharged
• Wrong type of refrigerant
Other
• Non-OEM 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.