Repair manual

Page 22
Location:
The blanket warmer is wrapped around the tank
assembly.
Operation:
The blanket warmer provides a low consistent heat
around the tank at the point of the temperature sensor.
This additional heat aids the heater circuit by reducing
the number of on/off cycles, thereby extending the life
of the relay contacts and the heater.
Test Procedures:
1. Disconnect the brewer from the power source.
2. With a voltmeter, check voltage across the two
wires at the warmer element with the "ON/OFF"
switch in the "ON" position. Connect the brewer
to the power source. The indication must be 120
volts ac for two wire 120 volt models and three
wire 120/208 and 120/240 volt models, or 230
volts ac for two wire 230 volt models.
3. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to Wiring
Diagrams and check wiring harness.
4. Check the resistance across the two terminals on
the blanket warmer. Refer to chart below.
If resistance is to specifi cation, reconnect the two
wires to the blanket warmer.
If resistance is not to specifi cation, replace the blanket
warmer.
Removal and Replacement:
1. Disconnect the blanket warmer wire from the pig-
gyback terminal on the refi ll valve.
2. Remove the tank assembly from the brewer.
3. Peel old blanket warmer off tank.
4. Install new blanket warmer on tank with bottom
of blanket 1½˝ from bottom of tank.
5. Connect one of the white wires to the piggyback
terminal on the limit thermostat.
6. Reinstall tank assembly.
7. Connect the other white wire to the piggyback
terminal on the refi ll valve.
FIG. 22-1 BLANKET WARMER
BLANKET WARMER
50W-120V 288.0
50W-220V 968.0
WARMER RESISTANCE
39132 041708