Structural Concepts HARMONY HMO5153R User Manual page 35

TROUBLESHOOTING (BY TRAINED SERVICE PROVIDERS ONLY) - CONDENSING SYSTEM
CONDITION
Head Pressure Too
High
Head Pressure Too
Low
Check that the Condensing Coil is not dirty or covered.
Check that Condensing Fans are working.
Check that refrigerant is not overcharged.
Check to verify that a non-condensable is not in the system.
Check that Liquid Line Drier is not plugged.
Check that there are no close-offs around Condensing Coil.
Check Set Point Temp.; it may be adjusted too high.
Check System Operating Temperatures.
Check that Store Ambient Temperature isn't above maximum allowed. See
Overview and Warnings Section.
Check that Refrigerant Charge isn't too low.
Check that Suction Pressure isn't too low.
Check to verify that Compressor Valves aren't bad.
TROUBLESHOOTING
35