Vollrath Stoelting O431, Service Manual

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SPIGOT SWITCH REPLACEMENT
1. Remove the header panel.
2. Remove the dispense rate adjuster knob located
below the header panel. (Refer to Figure 6-9)
3. Remove the two Phillips head screws that attach
the spigot cam assembly to the panel. Remove
the assembly.
4. Disconnect the connector from the switch and
remove the switch.
5. Install the replacement switch onto the handle
assembly. Do not fully tighten the retaining screws
at this time.
6. Using a pencil, mark the spigot glide 1/4” from
the spigot housing. Adjust the switch to activate
when the spigot handle moves the glide to the
mark.
7. Fully tighten the retaining screws.
8. Attach the connector to the spigot switch.
9. Position the spigot handle assembly in the
electrical box and fasten securely with the two
Phillips head screws.
10. Replace the dispense rate adjuster knob and
tighten.
11. Replace the header panel and secure with the
two Phillips head screws.
B. PUMP PRESSURE SWITCH
The pump pressure switch maintains 21-24 psig in the
mix line.
PUMP PRESSURE SWITCH TEST
1. Turn off the pump motor.
2. Open the spigot to relieve air pressure in the
system.
3. Connect a gauge between the 1/4” ID tubing and
the air line into the cab. The air line is at the top
rear of the cab.
4. Turn on the pump motor.
5. The motor should cutout when the gauge reads
24 psig ±1.
6. Open the spigot and monitor the gauge. The motor
should cutin when the gauge reads 21 psig ±1.
C. CAB DOOR MAGNETIC REED SWITCH
The cab door magnetic reed switch is a normally closed
held open switch. When the cab door is opened, the
switch sends a signal to the control to stop refrigeration
to the cabinet. This prevents the evaporator from icing up.
REED SWITCH TEST
1. Place the Main Power OFF/ON switch and both
Freezing Cylinder OFF/ON switches in the OFF
position.
2. Refer to the wiring diagram and remove the wires
at terminals 5 and 9 of the left control board.
3. Check resistance readings across the wires. When
the cab door is closed, the resistance should
show an open. When the cab door is opened,
the resistance should be 0 ohms.
4. Reconnect the wires to the control board.
Figure 6-10 Attaching Gauge to Pump
Attach Pressure
Gauge
Cab Door
Switch
1/4”
Figure 6-11 Cab Door Switch (Side View)