Classic HVPA & HVPSA M&S 8.09-1
15700 - 14
HVAC Equipment
Cooling Mechanical Checks Flow Chart
Unit Running?
YES
NO
Pressure Problems?
Go to Electrical
Checks Flow Chart
High Head
Pressure
Low Head
Pressure
Low Suction
Pressure
Dirty Outdoor Filter
Low on Charge
Dirty Filters
Inoperative Outdoor
Fan
Low Ambient
Temperature
Dirty Indoor Coil
Overcharge
Inoperative
Compressor Valves
Inadequate Indoor Air
Flow
Recirculation of
Outdoor Air
Outdoor Check Valve
Closed
Inoperative Indoor
Blower
Non-condensibles
Restricted Indoor
Metering Device
Low on Charge
Higher than Ambient
Air Entering Outdoor
Coil
Restricted Filter
Drier
Restricted Indoor
Metering Device
Wrong Outdoor Fan
Rotation
Reversing Valve
Failure
Restriction in System
Recirculation of
Indoor Air
Wrong Indoor
Blower Rotation
Inadequate Ducts
Outdoor Check
Valve Closed
Restricted Filter Drier
