On the display
The panel reads Oil - Variable speed pump - High rate of change. The same message is printed elsewhere in the manual set with different capitalization as Oil - Variable Speed Pump - High Rate Of Change. It belongs to the Safety fault messages group and is a safety fault, so tripping it shuts the chiller down immediately.
What it means
Once the chiller has been running for 90 s, the control compares the oil pump's current frequency with the frequencies that preceded it over a set interval. That compared value is what the manual names the oil pump frequency difference. When the value is greater than 1.5 Hz (default), this safety fault trips and immediately shuts the chiller down.
Why it appears
- The oil pump frequency difference — the oil pump's current frequency measured against the frequencies that preceded it over a set interval — is greater than 1.5 Hz (default) once the chiller has been running for 90 s.
Setpoints and thresholds
- Trip value: an oil pump frequency difference greater than 1.5 Hz (default).
- Start of monitoring: after the chiller has been running for 90 s.
- Bypass: changing the oil pressure setpoint while the chiller runs bypasses this fault for 60 s.
- Bypass window change: the time since the oil pressure setpoint changed was raised from 15 seconds to 60 seconds.
Reset and restart
This safety fault shuts the chiller down immediately. The message is released when the Clear button is pressed next to the listed event on the Systems Details Screen.
Questions engineers ask
What does Oil - Variable speed pump - High rate of change mean on a YORK YK?
After the chiller has been running for 90 s, the control compares the oil pump's current frequency with the frequencies that preceded it over a set interval. If that difference is greater than 1.5 Hz (default), the safety fault trips and the chiller shuts down immediately.
How do I clear the Oil - Variable speed pump - High rate of change message on a YORK YK?
Go to the Systems Details Screen and press the Clear button beside the listed event. Doing so releases the message.
Why is the fault bypassed after the oil pressure setpoint changes?
Changing the oil pressure setpoint while the chiller runs bypasses this fault for 60 s. The time since the setpoint changed was raised from 15 seconds to 60 seconds.
What threshold triggers this YORK YK oil pump fault?
The trip value is an oil pump frequency difference greater than 1.5 Hz (default). The comparison starts once the chiller has been running for 90 s.
Messages next to this one
Source
Written from the manufacturer's manuals for the YORK YK; every number and designation on this page is checked against them before publication. The row of the manual this message comes from:
All YORK YK messages: fault codes · YORK YK documentation · YORK manuals