Service manual

Page 23
SERVICE (cont.)
TANK HEATER SWITCH (cont.)
14. 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.
15. Reconnect the two black wires to the tank heater
switch terminals.
16. Set tank assembly inside the hood on mounting
brackets and secure with two #8-32 screws.
17. Reconnect the wires to the limit thermostat, tank
heater and the control thermostat. Refer to limit
thermostat, tank heater and control thermostat
sections in this manual when reconnecting
wires.
18. Brewers with faucet reinstall the faucet tube and
reconnect the water supply tube to the coil as-
sembly.
19. Secure the sprayhead tube to the hood using hex
nut.
20. Install sprayhead.
21. Install fill basin, inlet gasket and secure to tank
lid with tank inlet fitting.
22. Carefully install water fill tube into the back of
the fill basin.
23. Reconnect and turn on the incoming water sup-
ply.
24. Refer to the illustration below when reconnecting
the wires.
5. Check for continuity between the black wire re-
moved from the limit thermostat and the black
insert on the terminal block. with the tank heater
switch in the "ON" upper position. Continuity
should not be present in the "OFF" lower posi-
tion.
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 reassem-
bly.
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. (BUNN-O-MATIC
has #12440 syphon assembly available for this
purpose.
9. Gently reinstall the thermostat sensor and grom-
met in the tank lid.
10. Remove the two #8-32 screws securing the tank
assembly to the hood.
11. Lift tank and components out as an assembly
and set aside for reassembly.
12. Disconnect the two black wires from the tank
heater switch.
13. 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.
10841 020503
P1135
BLK to Terminal Block
(Black Insert)
BLK to Limit Thermostat
FIG. 18 TANK HEATER SWITCH WIRING