YORK YK — Motor - Cooling coil leak

The panel shows Motor - Cooling coil leak. This exact wording is the only form the manuals print for this message, and it belongs to the chiller's safety fault messages — a message of this kind means the unit has carried out a safety shutdown.

The motor cooling coil leak detector has registered a fault condition for at least 3 s continuously. Which sensor input produced the trip depends on the type of sensor the motor cooling coil leak protection setpoint enables: with an optical sensor, the input to the motor monitoring board goes high to indicate a leak; with a float switch, the input goes low to indicate a leak. The manual classifies this trip as a safety shutdown.

• The motor cooling coil leak detector registered a fault condition continuously for at least 3 s.
• With an optical sensor, the input to the motor monitoring board goes high to indicate a leak.
• With a float switch, the input goes low to indicate a leak.

• The motor cooling coil leak protection setpoint enables the type of sensor employed — an optical sensor or a float switch.
• When the motor cooling coil leak protection setpoint is set to disabled, this safety shutdown does not occur.

The chiller can be started again only once the leak sensor no longer indicates a leak and the event has been cleared from the display. The two manuals for this model describe the clearing action differently: one instructs to press the CLEAR FAULT key on the display, the other to press the Clear button next to the listed event on the Systems Details Screen. Once the sensor no longer indicates a leak and the event has been cleared in either of these ways, the chiller can be started.