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Member Post posted an update
YCAV Oil Filter
Does anyone have documentation on checking oil filter for a York YCAV?
Member Post, Member Post and Member Post8 Comments-
There is no real check you can do!
Have you done an oil analysis? That will give you good information on whether it should be changed or not. If your chiller has isolation valves, then its a pretty easy job to do, and to be honest, nt expensive, so it could be a good idea to do it.
Is there a big pressure drop between discharge and oil pressure?
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It’s about a 50psi drop. Does that seem excessive to you?
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High Differential Oil Pressure Cutout Fault
The High Differential Oil Pressure Cutout protects the compressor from low oil flow and insufficient
lubrica-tion, possibly from a dirty oil filter. A system will fault and shut down with a controlled
ramped shutdown when its Discharge to Oil Differential Pressure rises above the cutout of 65 PSID.
This safety is ignored for the first 90 seconds of run time. This safety measures the pressure
differential between discharge and oil pressure, which is the pressure drop across the oil filter.
The Status display fault message for this safety is shown below:
SYSTEM SAFETIES (FAULTS)
SYS X YYYYYYYY HIGH DIFF OIL PRESSURE -
Low Differential Oil Pressure Cutout Fault
The Low Differential Oil Pressure Cutout protects the
compressor from low oil fl ow and insuffi cient lubrication.
A system will fault and shut down with a controlled
ramped shutdown when it’s differential between oil
and suction pressure falls below the cutout. This safety
assures that the compressor is pumping suffi ciently to
push oil through the oil cooling circuit and through the
internal compressor lubrication system. The Status
display fault message for this safety is shown below:
SYS X YYYYYYYY LOW DIFF OIL PRESSURE
X indicates the system and YYYYYYY indicates the
system is in a “FAULT” condition and will restart when
the 120 second anti-recycle timer times out or “LOCKOUT”
and will not restart until the operator clears the
fault using the keypad.
The safety is ignored for the fi rst 60 seconds of run time.
After the fi rst 60 seconds of operation, the cutout is linearly
ramped from 0 PSID to 30 PSID in 5 to 10 minutes
based on ambient temperature. See TABLE 13 for the
ramp times for the given ambient temperatures. -
TABLE 13 – LOW DIFFERENTIAL OIL PRESSURE
CUTOUT
AMBIENT TEMPERATURE
TABLE 13 – LOW DIFFERENTIAL OIL PRESSURE
CUTOUT
AMBIENT TEMPERATURE RAMP
TIME
> 50ºF 5 Minutes
> 45ºF 6 Minutes
> 40ºF 7 Minutes
> 35ºF 8 Minutes
> 30ºF 9 Minutes
>=30ºF 10 Minutes
A 30 second safety bypass below 50 Hertz is employed during rampdown. The bypass is primarily
needed under conditions where another compressor is being brought on and the running compressor is
being ramped down to 5 Hertz to add the additional compressor due to load requirements. Under these
conditions, the slow speed of the running compressor(s) causes the oil differential to become very
low, especially if the water temperature is high and the suction pressure is high. The bypass
as-sures the compressor(s) will not trip on a nuisance low oil differential fault.
High Discharge Temperature Cutout Fault-
Thank you!!!!! This is extremely helpful
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