SERVICE (cont.)
TANK HEATER SWITCH
FIG 14 TANK HEATER SWITCH | P2186.45 |
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Location:
The tank heater switch is located on the rear of the brewer on the upper left side of the trunk.
Test Procedure:
1.Disconnect the brewer from the power source.
2.Disconnect the black wire from the limit thermo- stat.
3.With the tank heater switch in the "ON" positionand with a voltmeter, check the voltage between the black wire removed from the limit thermostat and the white wire or red wire on the tank heater. Connect the brewer to the power source. The indication must be:
a)120 volts ac on two wire 120 volt models.
b)240 volts ac on three wire 120/240 volt models.
c)200 to 240 volts ac on 200 volt or 240 volt models.
4.Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring har- ness.
5.With the tank heater switch in the "ON" upper position, check for continuity between the black wire removed from the limit thermostat and the black insert on the terminal block. Continuity should not be present in the "OFF" lower position.
If continuity is present as described, the tank heater switch is operating properly.
If continuity is not present as described, replace the tank heater switch.
Removal and Replacement:
1.Shut off and disconnect the incoming water sup- ply to the brewer.
2.On automatic brewers gently remove the fill tube from back of fill basin.
3.Remove the tank inlet fitting securing fill basin the tank lid. Remove fill basin and gasket. Set all three parts aside for reassembly.
4.On brewers with faucets, disconnect the water supply to coil assembly and remove the tube from the tank to the faucet.
5.Remove sprayhead and hex nut securing spray- head tube to the hood. Set aside for reassembly.
6.Disconnect the wires on the limit thermostat and the tank heater and the control thermostat (early models).
7.Gently pull the thermostat sensor and grommet from the tank lid.
8.Insert a tube to the bottom of the tank and syphon ALL of the water out.
9.Remove the two
10.Lift tank and components out as an assembly and set aside for reassembly.
11.Disconnect the two black wires from the tank heater switch.
12.Remove the plastic facenut, hex facenut and the switch indicator/guard bracket that secures tank heater switch to the rear of the brewer. Remove switch and discard.
13.Insert new tank heater switch through the hole in the upper left rear of the trunk and secure with switch indicator/guard bracket, hex facenut and plastic facenut.
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