Bunn FMD-1 Mode D'Emploi

38

NOTE - If the tank heater remains unable to heat, remove 

and inspect heater for cracks in the sheath.

Removal and Replacement:

1.  Disconnect the dispenser from the power source.

2.  Disconnect the water supply tube on the tank lid.

3.  Disconnect  the  black    wires  on  the  limit 

thermstat.

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

from the tank heater terminals.

5.  Disconnect the pink wire from the liquid level probe 

and the green wire from the tank.

6.  Remove  the  thermostat  capillary  bulb  by  firmly 

pulling-up on the capillary at the tank lid. This will 

disengage the grommet from the tank lid.

7.   Remove the ten #8-32 nuts securing the tank lid to 

the tank.

8.  Remove tank lid with limit thermostat, liquid level 

probe and tank heater as an assembly.

9.  Remove the two hex nuts securing the tank heater 

to the tank lid. Remove tank heater with gaskets 

and discard.

10. Install new tank heater with gaskets on the tank lid 

and secure with two hex nuts.

11. Install  tank  lid  with  limit  thermostat,  liquid  level 

probe and tank heater on the tank and secure with 

ten #8-32 hex nuts.

12. Connect water inlet line to the tank lid.

13. Reconnect the black wires to limit thermostat,  the 

pink wire to the liquid level probe and the green 

wire to the tank. Refer to the limit thermostat and 

the liquid level board and probe sections in this 

manual when reconnecting wires.

14. Refer to Fig. 41  when reconnecting the wires to 

the tank heater.

FIG. 41 TANK HEATER TERMINALS

P1218

WHI or RED to

Main Harness

BLK to Limit

Thermostat

J1

FIG. 42 TANK HEATER SWITCH

P1665

Location:
 

The tank heater switch located inside the dis-

penser on the upper right of the front panel.

Test Procedure:

1.  Disconnect the dispenser from the power source.

2.  Disconnect the black wires  from the main wiring 

harness.

3.  With the switch in the “ON” lower position check 

for  continuity  between  the  center  and  the  upper 

terminal. With the switch in the “OFF” upper posi-

tion no continuity should be present between center 

and upper terminals.

If continuity is present as described, the tank heater 

“ON/OFF” switch is operating properly.

If continuity is not present as described, replace the 

switch.

Removal and Replacement:

1.  Remove the switch mounting nut on the front of 

the front panel.

2.   Remove switch with wires attached from the rear 

of the front panel.

3.  Remove the wires from the switch terminals and 

discard switch.

4.   Connect the wires to the new switch, refer to Fig. 

43.

5.  Push new switch through hole in the front panel 

and secure with facenut.

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