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Discharge Pressure

Discharge Pressure Too High

QuestionsCauseRemedy
Is the condenser clean?Dirty condenserClean condenser
Are the condenser fans running?Condenser fans not runningRepair or replace
Is the water valve open?Water shut offTurn on water
 Water-cooled condenser restrictedClean or replace condenser
Have you checked the refrigerant charge?Refrigerant overchargeRecover excess charge
Is there air or other non-condensables in the system?Non-condensables in the systemRemove from the system
Where is the unit located? What is air temperature entering condenser?Poorly ventilated or hot locationProperly ventilate unit or relocate
Is there any air recirculation from this or any other units?Air recirculationProperly ventilate unit or relocate
Is discharge valve partially closed?Discharge valve partially closedOpen discharge valve
Is heat pressure control set and functioning properly?Head pressure setting too high. Headmaster malfunctioningAdjust setting or replace control

 

Discharge Pressure Too Low

QuestionsCauseRemedy
Where is the unit located? What is air temperature entering condenser?Cold ambient air temperature or cold water.None. Efficiency increased.
Have you checked refrigerant charge?Refrigerant shortage.Repair leak and recharge.
Is compressor suction or discharge valve partially closed?Compressor suction or discharge valve partially closed.Open valve.
Is compressor suction or discharge valve leaking?Compressor suction or discharge valve inefficient.Clean or replace leaky valve plates.
Is condenser pressure regulator operating properly?Faulty condenser pressure regulator.Repair or replace.
Do you have low suction pressure?See section XI on low suction pressure.Correct.