Welbilt FB081TF, Service Manual

Page: 66 / 96

66 Part Number REV00 04/08/2020
Component Check Procedures Section 7
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
Specifications
Refrigerant Type Cut-In (Close) Cut-Out (Open)
R404A 250 ±5
(1723 kPa ±.34)
(17.23 bar ±.34)
200 ±5
(1517 kPa ±.34)
(15.17 bar ±.34)
R290 250 ±5
(1723 kPa ±.34)
(17.23 bar ±.34)
200 ±5
(1517 kPa ±.34)
(15.17 bar ±.34)
CHECK PROCEDURE
1. Verify fan motor windings are not open or grounded,
and fan spins freely.
2. Connect manifold gauge set to ice machine.
3. Hook voltmeter in parallel across the fan cycle control,
leaving wires attached.
4. Refer to chart below.
FCC Setpoint:
Reading
Should Be:
Fan
Should Be:
Above Cut-In 0 Volts Running
Below Cut-Out Line Voltage Off
ICE CHUTE SWITCH
Function
When the storage bin is full, the ice contacts the paddle
and holds the switch open. After the switch is open for 5
continuous seconds, the ice machine shuts off and a15
minute delay period starts. The ice machine remains off
until enough ice is removed from the storage bin to allow
the switch to close. The ice machine will then restart,
provided the 15-minute delay has expired.
Specifications
Normally closed, 5 amps 125/250 VOLTS
Symptoms
Ice Chute Switch Fails Open
• The ice machine will not start an ice making cycle and
the control board bin switch light remains on.
Bin Switch Fails Closed
• The ice machine continues to run after ice contacts the
ice damper and the control board light remains off.
DIAGNOSTICS
1. Open and close the ice chute switch repeatedly while
observing the control board lights.
A. Ice chute switch cycles open/closed and control
board light energizes/de-energizes - Ice chute
switch is operating normally
B. Ice chute switch remains closed and the control
board light remains off. Disconnect the ice chute
switch wire from the control board (Bin Level
connector). If the light energizes replace the ice
chute switch; if the light remains off replace the
control board.
C. Ice chute switch remains open and control board
light remains on. Disconnect the ice chute switch
wire from the control board (Bin Level connector)
and jumper control board terminals. If the light de-
energizes replace the ice chute switch; if the light
remains on replace the control board.