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16.2 COOLING MECHANICAL CHECKS FLOW CHART
Unit Running?
YES
NO
Go to Electrical
Pressure problems?
Checks Flow Chart
High Head Pressure
Low Head Pressure
Low Suction Pressure
Dirty Outdoor Coil
Low on Charge
Dirty Filters
Inoperative Outdoor Fan
Open IPR Valve
Dirty Indoor Coil
Overcharge
Low Ambient Temperature
Inadequate Indoor Air Flow
Recirculation of
Inoperative Compressor
Broken Indoor
Outdoor Air
Valves
Blower Belt
Non-condensibles
Outdoor Check Valve
Inoperative Indoor Blower
Closed
Higher than Ambient
Low on Charge
Air Entering Outdoor Coil
Restricted Indoor
Restricted Indoor
Wrong Outdoor Fan Rotation
Metering Device
Metering Device
Restricted
Restriction in System
Filter Drier
Recirculation of
Reversing Valve
Indoor Air
Failure
Wrong Indoor
Blower Rotation
Inadequate Ducts
Outdoor Check Valve Closed
Restricted Filter Drier