YORK YK — Oil - Low viscosity

The panel shows Oil - Low viscosity; the manuals also print it in capitals as OIL - LOW VISCOSITY. It appears in the manuals' Safety fault messages list as well as in the display messages list, and both describe it as a safety fault.

This is a safety fault that only applies when the Oil Quality Protection and Oil Cooling control are both enabled. When the trip occurs, the oil kinematic viscosity of the running chiller has stayed below one of the JCI Service programmable trip thresholds long enough to meet the long trip or the short trip condition set out under causes.

• Long trip: after 10 min of running, the oil kinematic viscosity stayed below the JCI Service programmable Low Viscosity Trip Threshold Long Trip (default 8.0 cSt) for 5 min.
• Short trip: after 1 min of running, the viscosity stayed below the JCI Service programmable Low Viscosity Trip Threshold Short Trip (default 6.0 cSt) for 10 s.

1. Confirm that both Oil Quality Protection and Oil Cooling control are enabled, since the fault only applies when they are.
2. Check the running time and the oil kinematic viscosity against the two trip conditions listed under causes to see which one the chiller met.

• Low Viscosity Trip Threshold Long Trip — a JCI Service programmable parameter, default 8.0 cSt; the long trip needs 5 min below it once the chiller has run 10 min.
• Low Viscosity Trip Threshold Short Trip — a JCI Service programmable parameter, default 6.0 cSt; the short trip needs 10 s below it once the chiller has run 1 min.

The manuals allow the fault to be cleared only once the chiller has stopped. On the Systems Details Screen, press the Clear button next to the listed event; the other manuals word the same step as selecting the Clear Fault key.