Manitowoc STH042 4/16, Technician'S Handbook

Page: 110 / 146

110 Part Number STH042 4/16
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)
U140
U190 250 psig ±5 200 psig ±5
U240
U310 275 psig ±5 225 psig ±5
Check Procedure
Disconnect electrical power to the ice machine at the
electrical service disconnect.
Verify fan motor windings are not open or grounded, and
fan spins freely.
Connect manifold gauge to ice machine.
Hook voltmeter in parallel across the fan cycle control,
leaving wires attached.
Reconnect electrical power to the ice machine and press
the power button to ON.
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