On the display
The panel shows Warning - Standby lube - Low oil pressure; some manuals print the same message as Warning - Standby Lube - Low Oil Pressure. It belongs to the warning messages of this chiller. The action tied to it is that the message stays displayed and no further standby lubrications are performed until it is cleared by hand.
What it means
The warning reports that a standby lubrication cycle did not build enough oil pressure. The manual gives two triggers. First, a minimum of 15 psid of oil pressure was not achieved in the first 30 s of a standby lubrication cycle, or the pressure decreased below this value during the remainder of the cycle. Second, the warning is also set when either the pump oil pressure transducer or the sump oil pressure transducer is less than 2 psig when a standby lube is requested by automatic control; per the manual, this inhibits the standby lube cycle when the chiller is open to atmosphere. A later description of this message notes that the 2 psig condition is set in addition to the existing required conditions.
Why it appears
- A standby lubrication cycle failed to reach a minimum of 15 psid of oil pressure within the first 30 s, or the pressure decreased below 15 psid during the remainder of the cycle.
- The pump oil pressure transducer or the sump oil pressure transducer read less than 2 psig when automatic control requested a standby lube — the manual ties this to the standby lube cycle being inhibited when the chiller is open to atmosphere.
Setpoints and thresholds
- 15 psid — the minimum oil pressure a standby lubrication cycle must achieve and hold.
- 30 s — the initial period of the standby lubrication cycle in which the 15 psid must be reached.
- 2 psig — the threshold below which the pump oil pressure transducer or the sump oil pressure transducer sets the warning when a standby lube is requested by automatic control.
Reset and restart
The warning is cleared by hand. One manual states that no further standby lubrications are performed until the Clear button is pressed on the System Details Screen
. The other manual for this message calls it a manual reset warning that is cleared using the WARNING RESET key, and notes that the acknowledgement is entered in the Security Log.
Questions engineers ask
What does Warning - Standby lube - Low oil pressure mean on a YORK YK?
A standby lubrication cycle did not achieve 15 psid of oil pressure in its first 30 s, or the pressure fell below that value later in the cycle. It is also set when the pump or sump oil pressure transducer is less than 2 psig when automatic control requests a standby lube.
How do I clear the standby lube low oil pressure warning on a YK?
It is a manual reset: press the Clear button on the System Details Screen, or use the WARNING RESET key as the other manual describes, with the acknowledgement entered in the Security Log. Until it is cleared, no further standby lubrications are performed.
Why is standby lube inhibited when the chiller is open to atmosphere?
When a standby lube is requested by automatic control and either the pump oil pressure transducer or the sump oil pressure transducer reads less than 2 psig, the warning is set and the standby lube cycle is inhibited — the manual connects this with the chiller being open to atmosphere.
What oil pressure must a YK standby lubrication cycle reach?
A minimum of 15 psid, achieved within the first 30 s of the cycle and held for the remainder of the cycle.
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