Bunn VP17B service manual Tank Heater

Page 13

SERVICE (cont.)

TANK HEATER

P1161.40

FIG. 8 TANK HEATER

Location:

The tank heater is located inside the tank and secured 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 wires on the tank heater. Connect the brewer to the power source. The indication must be:

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

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

3.Disconnect the brewer from the power source.

2.Disconnect the black wire on the limit thermostat from the tank heater switch and disconnect the blue wire from the limit thermostat to the control thermostat.

3.Disconnect the black wire and the white wire from the tank heater terminals.

4.Remove sprayhead and the hex nut securing the sprayhead tube to the hood. Set aside for reas- sembly.

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

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

head tube and tank heater

7Remove the two hex nuts securing the tank heater

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

8.Install new tank heater with gaskets on the tank lid and secure with two hex nuts.

9.Install tank lid with limit thermostat, sprayhead tube and tank heater using eight #8-32 hex nut.

10.Secure spayhead tube to hood using a hex nut.

11.Install sprayhead.

12.Reconnect the wires to the limit thermostat, tank heater and control thermostat. See Limit Thermo- stat and Control Thermostat sections in this manual when reconnecting wires.

13.Install fill basin, secure with tank inlet fitting and gasket.

14.Refer to Fig. 9 when reconnecting the tank heater wires.

If voltage is present as described, proceed to #4

 

 

If voltage is not present as described, refer to the

WHI to WHI Lead on

 

Wiring Diagrams and check wiring harness.

 

Power Cord (120V

BLK to Control

 

Models)

 

Thermostat

4. Disconnect the black wire and the white wire from

WHI to Terminal Block

 

the tank heater terminals.

(White Insert) (100 V

 

5. Check for continuity across the tank heater termi-

Models)

 

 

 

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.

NOTE- If the tank heater remains unable to heat, remove and inspect heater for cracks in the sheath.

Removal and Replacement:

 

 

 

 

1. Remove the tank inlet fitting securing the fill basin

 

 

 

 

to the tank lid, remove fill basin and tank inlet

FIG. 9 TANK HEATER TERMINALS

 

P1163

 

 

 

 

 

gasket. Set all three parts aside for reassembly.

10860

090800

 

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Contents Post Office BOX SPRINGFIELD, Illinois BUNNVP17Introduction WarrantyUser Notices User Notices Initial SET-UP Electrical RequirementsCoffee Brewing CleaningProblem TroubleshootingProbable Cause RemedyTroubleshooting Probable Cause Remedy Water TemperatureComponent Access ServiceControl Thermostat Control ThermostatLimit Thermostat Limit ThermostatConnect wire to Terminal #1 as follows ON/OFF Warmer SwitchTank Heater Tank HeaterService Tank Heater Switch VP17B and early model VP17 Service Tank Heater Switch Warmer Element Terminals Warmer ElementsVolts AC 2 Wire Single Phase Schematic Wiring DiagramSchematic Wiring Diagram VP17B-1/-2/-3
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