Bunn TU5Q User Manual

Page 22

Page 22

SERVICE (cont.)

TANK HEATER

FIG. 20 TANK HEATER

Location:

The tank heater is located inside the tank and se-

cured to the tank lid.

Test Procedures:
1. Disconnect the brewer from the power supply.
2. With a voltmeter, check the voltage across the

black and white or red wires. Connect the brewer
to the power source. The indication must be:
a) 120 volts ac for 2-wire 120 volt models.
b) 208 volts ac for 3-wire 120/208 volt models.
c) 240 volts ac for 3-wire 120/240 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 Diagram

and check wiring harness.

4. Disconnect the black wire and the white 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.

P2143.35

If continuity is not present as described, replace the
tank heater.
NOTE- If the tank heater remains unable to heat, re-

move and inspect heater for cracks in the sheath.

Removal and Replacement:
1. Disconnect the black wire and the white or red

wire from the tank heater terminals.

2. Remove sprayhead and the hex nut securing the

sprayhead tube to the hood. Set aside for reas-
sembly.

3. Disconnect vent tube and water inlet tube.
4. Remove the eight #8 keps nuts securing the tank

lid to the tank.

5. Remove the tank lid with limit thermostat, spray-

head tube, tank heater and vent tube.

6. Remove the two hex nuts securing the tank heater

to the tank lid. Remove tank heater with gaskets
and discard.

7. Install new tank heater with gaskets on the tank

lid and secure with two hex nuts.

8. Install tank lid with limit thermostat, sprayhead

tube, tank heater and vent tube using eight #8 keps
nuts.

9. Secure sprayhead tube to hood using a hex nut.
10. Install sprayhead.
11. Connect vent tube and water inlet tube to fitting.
12. Reconnect the wires to the limit thermostat and

tank heater. See limit thermostat section in this
manual when reconnecting wires.

13. Refer to Fig. 21 when reconnecting the tank heater

wires.

FIG. 21 TANK HEATER TERMINALS

P1284.80

BLK to Control
Thermostat

WHI to Terminal
Block (120V)
RED to Terminal
Block (208&240V)

10777 041500

MINUTES

BUNN-O-MATIC

P/N 05791-0006 120 VAC