TroubleCompressor short cycles onlow- pressure control.Possible CauseCorrective MeasureLow refrigerant charge.Locate and repair leaks.Charge refrigerant.Thermal expansion valve notAdjust, repair or replace thermalfeeding properly.expansion valve.(a) Dirty strainers.(a) Clean strainers.(b) Moisture frozen in orifice or(b) Remove moisture or dirt (useorifice plugged with dirt.system dehydrator).(c) Power element dead or weak(c) Replace power element.Water flow through evaporatorsRemove restriction. Check water flow.restricted or stopped. Evaporator coilsClean coils or tubes.plugged, dirty, or clogged with frost.Defective low-pressure control switch.Repair or replace low-pressure controlswitch.Compressor runs continuously.Shortage of refrigerant.Repair leak and recharge system.Leaking discharge valves.Replace discharge valves.Compressor short cycles onInsufficient water flowing throughDetermine if water has been turnedhigh- pressure control switch.condenser, clogged condenser.off. Check for scaled or fouledcondenser.Defective high-pressure control switch. Repair or replace high-pressurecontrol switch.Compressor will not run.Seized compressor.Repair or replace compressor.Cut-in point of low-pressure controlSet L. P. control switch to cut-in atswitch too high.correct pressure.High-pressure control switch does notCheck discharge pressure and reset H.cut-in.P. control switch.1.Defective switch.1.Repair or replace switch.2.Electric power cut off.2.Check power supply.3.Service or disconnect switch3. Close switches.open.Figure 5-8.—Trouble diagnosis chart-Continued.5-14
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business