Bunn FMD-5 - Manual (Page 38)

38
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. 36 when reconnecting the wires to the
tank heater.
SERVICE (cont.)
FIG. 36 TANK HEATER TERMINALS P1218
WHI or RED to
Main Harness BLK to Limit
Thermostat
TANK HEATER
FIG. 35 TANK HEATER
Location:
The tank heater is located inside the tank and se-
cured to the tank lid.
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Check the voltage across the black and white wires
120 volt models or black and red wires for 120/208
volt models or 120/240 volt models with a voltme-
ter. Connect the dispenser to the power source.
The indication must be:
a) 120 volts ac for two wire 120 volt models;
b) 208 volts ac for three wire 120/208 volt models.
c) 240 volts ac for three wire 120/240 volt models.
3. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the
dispenser wiring diagram and check the wiring har-
ness.
4. Disconnect the black wire and the white 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.
NOTE - If the tank heater remains unable to heat,
remove and inspect heater for cracks in the sheath.
P2635
35135 012103