SERVICE (cont.)

 

 

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 six #10 thread cutting screws secur-

 

 

ing 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

P2200.50

 

lid and secure with two hex nuts.

FIG. 16 TANK HEATER

8.

Install tank lid with limit thermostat, sprayhead

Location:

 

tube, tank heater and vent tube using six #10

The tank heater is located inside the tank and se-

 

 

thread cutting screws.

cured to the tank lid.

 

9.

Secure sprayhead tube to hood using a hex nut.

 

Test Procedures:

10.

Install sprayhead.

11.

Connect vent tube and water inlet tube to fitting.

1. Disconnect the brewer from the power supply.

12.

Reconnect the wires to the limit thermostat, tank

2. With a voltmeter, check the voltage across the

 

heater. See limit thermostat section in this manual

black and white wires on 100 volt and 120 volt

 

 

when reconnecting wires.

models or the black and red wires for 230 volt

 

13.

Refer to Fig.17 when reconnecting the tank heater

models. Connect the brewer to the power source.

 

wires.

The indication must be:

 

 

 

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

b)230 volts ac for two wire 230 volt models.

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

BLK to Control

Thermostat

3. Disconnect the brewer from the power source.

 

If voltage is present as described, proceed to #4

WHI to Power Cord

(100/120V)or

If voltage is not present as described, refer to the

RED to Thermal Fuse

Wiring Diagrams and check wiring harness.

(230V)

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.

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.FIG. 17 TANK HEATER TERMINALS P1284.80

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Bunn TU3Q service manual Tank Heater