Bunn CEZ-TS User Manual

Page 28

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. With  a  voltmeter,  check  the  voltage  across  the

white or red wire from the terminal block and the
black  wire  from  the  control  board.  Connect  the
brewer to the power source. The indication must
be 120 volts ac for two wire 120 volt models or 240
volts ac for three 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 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.

P1855

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,
remove and inspect heater for cracks in the sheath.

Removal and Replacement:
1. Remove the top cover or top warmer housing and

front access panel as previously described.

2. Disconnect the vent hose from the top of the tank

by pulling the elbow fitting from the grommet in
the top of the tank lid.

3. Drain water from the tank.
4. Disconnect the water supply tube to the dispense

valve from the side of the tank.

5. Disconnect the water supply tube to the solenoid

valve from the bottom of the tank.

6. On  brewers  with  faucet,  disconnect  the  outlet

water line to the faucet from the side of the tank.

7. Disconnect the temperature probe from the top of

the tank by pulling the probe from the grommet in
the top of the tank lid.

8. Disconnect the pink wire from the level probe.
9. Disconnect the green wire from the top of the tank.
10. Disconnect the limit thermostat from the side of

the tank.

11. Disconnect  the  two  white  wires  from  the  tank

warmer blanket.

12. Disconnect the black wire and the white or red wire

from the tank heater terminals.

13. Remove the four #8-32 nuts securing the tank to

the mounting brackets and remove the tank as-
sembly.

14. Remove the eight #8-32 nuts securing the tank lid

to the tank.

15. Remove the two hex nuts securing the tank heater

to the bottom of the tank. Remove tank heater with
gaskets and discard.

16. Install new tank heater with gaskets to the bottom

of the tank and secure with two hex nuts.

FIG. 13 TANK HEATER

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