Welbilt Koolaire KD0270A, Technician'S Handbook, Page: 103 / 136

Part Number STH047 Rev01 10/18 103
Fan Cycle Control
Function
Cycles the fan motor on and off to maintain proper
operating discharge pressure.
The fan cycle control closes on an increase, and opens on a
decrease in discharge pressure.
Specifications
Model Cut-In (Close) Cut-Out (Open)
KF150 K170 275 psig ±5 225 psig ±5
KF250 K270 250 psig ±5 200 psig ±5
Check Procedure
1. Disconnect electrical power to the ice machine at the
electrical service disconnect.
2. Verify fan motor windings are not open or grounded,
and fan spins freely.
3. Connect manifold gauge set to ice machine.
4. Hook voltmeter in parallel across the fan cycle control,
leaving wires attached.
5. Reconnect electrical power to the ice machine and set
the ON/OFF/WASH toggle switch to ON.
6. Wait until water flows over the evaporator then refer
to chart below.
System
Pressure:
Reading
Should Be:
Fan
Should Be:
above cut-in 0 volts running
below cut-out line voltage off