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 mod-
els,
b.) 200 to 240 volts ac for 200 to 240 volt mod-
els,
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.
P1793
Removal and Replacement:
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 neces-
sary.
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
10267 011599