Tank Heater - Bunn S Operating & Service Manual

SERVICE (cont.)

TANK HEATER

FIG. 12 TANK HEATER
Location:
The tank heater is located inside the tank and
secured to the tank bottom.
Test Procedures:
1. Disconnect the brewer from the power supply.
2. Check the voltage across the black and white
wires on 100 or 120 volt models or the black and
red wires for 120/240 volt models, 200 volt
models and 240 volt models with a voltmeter.
Connect the brew to the power source. The
indication must be:
a) 120 volts ac for two wire 120 volt 15 and 20
amp models .
b) 240 volts ac for three wire 120/240 volt
models.
c) 200 to 240 volts ac for two wire 200 or 240 volt
models.
d) 100 volts ac for two wire 100 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 the
Wiring Diagrams and check wiring harness.
4. Disconnect the black wire and the white wire or
red wire from the tank heater terminals.
5. Check for continuity across the tank heater termi-
nals.
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.
P1592
NOTE- If the tank heater remains unable to heat,
remove and inspect heater for cracks in the sheath.
Removal and Replacement:
1. Remove top cover or top warmer housing as
prevoiusly described.
2. Disconnect the water supply tube from the sole-
noid.
3. On brewers with faucet, disconnect the faucet.
4. Remove sprayhead and the hex nut securing the
sprayhead tube to the hood. Set aside for reas-
sembly.
5. Disconnect the wire from the tank level probe.
6. Remove the thermostat capillary bulb as de-
scribed in section for control thermostat.
7. Disconnect the wires from the limit thermostat.
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