Koolaire KD0172A, Technician'S Handbook

Page: 103 / 132

Part Number STH047 5/16 103
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-n (Close) Cut-Out (Open)
K170 275 psig ±5 225 psig ±5
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 gauges 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