50.40-OM1 — YS and YK Water Cooled Refrigerant Recovery and Recycling Units Operation and Maintenance

Document type	Operation Guide
Document number	50.40-OM1
Equipment	YK Centrifugal Chiller
Brand	YORK
File size	3.6 MB

Fault codes in this document

Detection and Removal of Non-Condensible Gases

Code / display	Meaning	Cause	Action	Page
Pressure in the storage vessel exceeds the saturation pressure of the refrigerant at the ambient temperature	Presence of non-condensible gases – if the pressure exceeds the saturation pressure by the amount shown in Table 8, there is a need to vent the non-condensible gases		Vent the non-condensible gases from the Schraeder type valve located on the top of the storage vessel for a period of fifteen seconds; repeat until the saturation pressure in the storage vessel is within the pressure range shown in Table 8; allow the storage vessel and contained refrigerant to equalize to ambient temperature between ventings	17

Checking Compressor for Performance

Code / display	Meaning	Cause	Action	Page
Discharge pressure drops more than 5 Ibs. (34.5 kPa) in one minute	Indicates the discharge valves of the valve assembly are leaking	Leaking discharge valves of the valve assembly	Discharge valves should be replaced; if in doubt as to whether the discharge valves leak, turn the compressor over by hand – if pressure rises and falls with each revolution, this will confirm the discharge valve leak	31
Failure of a compressor to reach 25” (85 kPa) vacuum	Indicates leaky suction valves; all compressors should pump a 25” (85 kPa) vacuum against normal head pressures	Leaky suction valves		31

Gurgling Noise – Vacuum Pump Model CRR-1

Code / display	Meaning	Cause	Action	Page
Gurgling noise	The vacuum pump will gurgle when the oil level in the pump is low	Oil level in the pump is low		43
Gurgling noise	The vacuum pump will gurgle when a large leak is present in the system being evacuated	Large leak present in the system being evacuated		43

Suction and Discharge Pressure Problems – Vacuum Pump Model CRR-1

Code / display	Meaning	Cause	Action	Page
Insufficient suction pressure	Insufficient suction or discharge pressure	Leakage; oil contamination; V-belt slippage; low oil level – four major causes of insufficient suction or discharge pressure	Determine the pump’s ultimate pressure capability: if the suction obtainable is very poor, the pump may be badly contaminated, low on oil or malfunctioning; if the pressure is only slightly higher than the guaranteed ultimate pressure of the pump, an oil change may be all that is required	43
Insufficient discharge pressure	Discharge pressure insufficient although the recovery and/or recycle system is free from leaks and sufficient suction exists	Insufficient flow of refrigerant vapor into the vacuum pump; low oil level; V-belt slippage; leak in the oil case of the vacuum pump	Check to see that the tubing connecting the suction port to the chiller is not obstructed; if none of these explanations fit the observations, the pump may be malfunctioning and should be sent back to a repair facility	43

Every row above cites the page of this document it came from, and each one is re-read against that page by an automatic check before publication. The short table of all YORK YK messages: fault codes.

Manufacturer document, published here as reference material for equipment we supply. The original lives at docs.johnsoncontrols.com. The rights holder may ask us to take it down — we will.