Fan Cycle Control (Self-Contained Air-Cooled Models Only); Specifications - Manitowoc Q450 Service Technician's Handbook

Fan Cycle Control
(Self-Contained Air-Cooled Models Only)
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.
Model
Q200/Q280
Q320/Q370/
Q420/Q450/
Q600
Q800/Q1000/
Q1300/Q1800
CHECK PROCEDURE
1. Verify fan motor windings are not open or
grounded, and fan spins freely.
2. Connect manifold gauges to ice machine.
3. Hook voltmeter in parallel across the fan cycle
control, leaving wires attached.
4. Refer to chart below.
FCC Setpoint:
Above Cut-In
Below Cut-Out

Specifications

Cut-In (Close)
250 psig ±5
(1724 kPa ±35)
275 psig ±5
(1896 kPa ±35)
Reading
Should Be:
0 Volts
Line Voltage
–115–
Cut-Out (Open)
200 psig ±5
(1379 kPa ±35)
225 psig ±5
(1551 kPa ±35)
Fan
Should Be:
Running
Off