Bunn OT Service Manual download pdf (Page 26)

Page 26

FIG. 30 TANK HEATER

FIG. 31 TANK HEATER WIRING

SERVICE (cont.)

Tank Heater

Removal and Replacement:

1. Remove the wires to the tank heater and limit

thermostat terminals.

2. Gently pull the thermostat tube with grommet out

of the tank lid.

3. Remove the sprayhead and sprayhead nut from

the panel on the bottom of the hood.

4. Disconnect the air vent tube from the fitting above

the sprayhead panel.

5. On units with faucet, disconnect the inlet and

outlet tubes from the faucet coil fittings.

6. Loosen the eight 8-32 nuts on the tank lid and

remove the tank lid.

7. Remove the two nuts from the tank heater fit-

tings.

8. Remove the tank heater.

9. Install the new tank heater with new sealing wash-

ers on the underside of the tank lid.

10. Securely tighten the nuts to be certain of a wa-

tertight seal.

11. Reinstall the tank lid and tighten the eight nuts.

12. Reconnect the air vent tube to the fitting above

the sprayhead panel.

13. Reconnect the inlet and outlet tubes to the fau-

cet coil fittings on units with faucet.

14. Reinstall the sprayhead tube nut and sprayhead.

15. Reinstall the thermostat into the tank lid.

16. Refer to FIG. 31 when reconnecting the wires.

Location:

The tank heater is located on the tank lid, FIG. 30.

Test Procedure:

1. Check the voltage across the black and white or

red wires on the tank heater with a voltmeter when

the control thermostat is turned "ON" (fully clock-

wise). Connect the brewer to the power source.

The indication must be:

a) 120 volts ac for two wire 120 volt models.

b) 200 or 240 volts ac for two wire 200 volt or

240 volt models and three wire 120/240 volt

models.

c) 100 volts ac for two wire 100 volt models.

2. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #3.

If voltage is not present as described, refer to the Wir-

ing Diagrams and check the brewer wiring harness.

3. Check for continuity across the terminals of the

tank heater.

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, re-

move and inspect the heater for cracks in the sheath.

WHI (Models OT15 & 20) to Terminal Block

RED (Models OT35 & RT35) to Terminal Block

BLK to Control Thermostat

P1698

P1700

10021 071700

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 35 36

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Bunn OT Service Manual Page 26

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