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Page 22
FIG. 20 TANK HEATER
SERVICE (cont.)
Tank Heater
Removal and Replacement:
1. Disconnect the brewer from the power source.
2. Remove the top cover or top warmer housing and
the rear access panel.
3. Disconnect the wires to the tank heater.
4. Gently pull the thermostat bulb with grommet out
of the tank lid.
5. Disconnect and remove the fill basin tube.
6. Remove the four #8-32 nuts and hold-down brack-
ets attaching the tank lid to the tank assembly and
remove the tank lid and gasket.
7. Drain the water from the tank using a syphon or
similar device.
8. Remove the two nuts securing the tank heater to
the bottom of the tank and remove the tank heater.
9. Install a new tank heater with new washers and
secure with two nuts. Nuts should be securely
tightened to insure a proper seal.
10. Install the tank lid and gasket using the four hold-
down brackets and #8-32 nuts.
11. Install the fill basin tube and tighten the nuts se-
curely.
12. Slide the grommet to the red mark on the capil-
lary tube.
13. Carefully bend the capillary tube so that the tube
and bulb inside the tank are in a vertical position.
14. Insert the bulb through the hole in the tank lid and
press the grommet firmly and evenly so that the
groove in the grommet fits into the tank lid.
15. Refer to FIG. 21 when reconnecting the wires.
16. Refer to Initial Setup to refill the tank.
Location:
The tank heater is located in the bottom of the
tank assembly, FIG. 20.
Test Procedure:
1. Check the voltage across the black and white or
red wires on the tank heater with a voltmeter when
the control thermostat is turned "ON" (fully clock-
wise). Connect the brewer to the power source.
The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models
b) 240 volts ac for two wire 240 volt models.
2. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #3.
If voltage is not present as described, refer to the Wir-
ing Diagrams and check the brewer wiring harness.
3. Check for continuity across the terminals of the
tank heater.
If continuity is present as described, reconnect the
wires, the tank heater is operating properly.
If continuity is not present as described, replace the
tank heater.
NOTE - If the tank heater remains unable to heat, re-
move and inspect the heater for cracks in the sheath.
P1715
(Added November 1999)
FIG. 21 TANK HEATER WIRING
BLK to Limit Ther-
mostat
WHI or RED to
Terminal Block
P1716