On the display
The control center displays Oil pressure safety cutout; some manuals print the same message in lowercase, oil pressure safety cutout. It belongs to the unit's safety shutdowns and warnings, and it appears when the oil pressure safety cutout has actuated and stopped the system.
What it means
This is a safety cutout, not an advisory message: when it actuates, it stops the system. The stop follows a fluctuation of the bearing oil pressure, with a possible temporary loss of lubrication. For this message the manual's action is to refer to the OptiView™ Control Center operation manual.
Why it appears
- Excessive refrigerant in the oil; a manual describes the refrigerant as absorbed in the oil during long idle periods.
- On starting, the pressure within the system is lowered and the refrigerant boils out of the oil, producing violent oil foaming.
- If this foam reaches the oil pump suction, the bearing oil pressure fluctuates with a possible temporary loss of lubrication, and the oil pressure safety cutout actuates and stops the system.
What to check
- Refer to the OptiView™ Control Center operation manual — the manuals give this referral as the action for this shutdown.
Questions engineers ask
What does the oil pressure safety cutout message mean on a YORK YK chiller?
It means the oil pressure safety cutout has actuated and stopped the system. The shutdown follows a fluctuation in bearing oil pressure with a possible temporary loss of lubrication.
Why does a YORK YK trip on oil pressure safety cutout at startup?
Refrigerant in the oil boils out as the pressure within the system is lowered on starting, causing violent oil foaming. If that foam reaches the oil pump suction, the bearing oil pressure fluctuates and the cutout stops the system.
Where does the refrigerant in the oil come from?
A manual describes refrigerant being absorbed in the oil during long idle periods. When the chiller starts again, that refrigerant boils out of the oil and foams it.
What should I do after an oil pressure safety cutout on a YORK YK?
The manual's action for this message is to refer to the OptiView™ Control Center operation manual.
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