Tank Heater - Bunn H5M Operating & Service Manual

SERVICE (cont.)

Tank Heater

Location:
The tank heater is located in the tank lid.
FIG. 7 TANK HEATER
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Check the voltage across the terminals of the tank
heater with a voltmeter. Connect the dispenser to
the power source. The indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt models,
b.) 200 to 240 volts ac for 200 to 240 volt models,
c.) 230 volts ac for 230 volt models.
3. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to #4.
If voltage is not present as described, replace the tank
heater.
4. Remove the tank heater from the tank lid and in-
spect it for cracks in the sheath.
If the sheath shows no sign of damage, proceed to #5.
If the sheath is damaged, replace the tank heater.
5. Check for continuity across the tank heater termi-
nals.
If continuity is present as described, reinstall the tank
heater. The tank heater is operating properly.
If continuity is not present as described, replace the
tank heater.
Removal and Replacement:
P1793
1. Remove the wires to the tank heater.
2. Remove the 8-32 nuts from the tank heater flange.
3. Remove the tank heater.
4. Inspect the tank heater gasket and replace if nec-
essary.
5. Securely install the new tank heater. Be certain of a
watertight seal.
6. Reconnect the wires, FIG. 8.
WHI to Terminal
Block or RED to
Contactor
FIG. 8 TANK HEATER WIRING
13
BLK to Limit
Thermostat or
BLK to Contactor
P1780
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