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York International Heat Pump Manuals

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  • AHP18 THRU 60 - York Heating and Air Conditioning Technical Guide
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  • e1fb024a06a - York International e1fb024a06a Heat Pump
  • E4TS030 - York International OWNER'S MANUAL OUTDOOR SPLIT-SYSTEM HEAT PUMP E4TS030, E4TS036, E4TS048, E4TS060
  • E4TS036 - York International OWNER'S MANUAL OUTDOOR SPLIT-SYSTEM HEAT PUMP E4TS030, E4TS036, E4TS048, E4TS060
  • E4TS048 - York International OWNER'S MANUAL OUTDOOR SPLIT-SYSTEM HEAT PUMP E4TS030, E4TS036, E4TS048, E4TS060
  • E4TS060 - York International OWNER'S MANUAL OUTDOOR SPLIT-SYSTEM HEAT PUMP E4TS030, E4TS036, E4TS048, E4TS060
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  • F3EH090 - York International Split System Heat Pumps Installation Manual
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  • SHP48 THRU 60 - York Heating and Air Conditioning Technical Guide
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  • UC - York Cooling & Heat Pumps Technical Guide

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Member Discussion on York International CHPO-24 (CHPO-18 thru 48) Heat Pump

Service Manual or Theory of Operation

[CHPO-18,CHPO-24,CHPO-30,CHPO-36,CHPO-42,CHPO-48]

I have a CHPO-24 -- the 'tabletop' outside unit and the ladder diagram. Ongoing problem is the unit goes into lockout whenever it tries to enter defrost mode. Second problem: it rarely tries to enter defrost mode.

Defrost is triggered by an air-pressure differential switch that is supposed to detect ice buildup on the evaporator coils. In reality, the coils must be a solid block of ice for the swich to activate. If and when the pres-diff swich closes the reversing valve starts to change, the fan relay clatters a couple times, and lockout occurs. However, if I put a jumper across the press-diff switch terminals, normal defrost cycle proceedes.

I have replaced the controller board to the tune of $220 with no change in behavior.

Does anyone know if there is a timed defrost cycle built into this model? Any new information greatly appreciated.

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