Tank Heater - Bunn CWA-APS Operating & Service Manual

SERVICE (cont.)

TANK HEATER

FIG. 12 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 red wires. Connect the brewer to the
power source. The indication must be 240 volts
ac.
3. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #4
If voltage is not present as described, refer to the
Wiring Diagram and check wiring harness.
4. Disconnect the black wire and the 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.
Removal and Replacement:
1. Disconnect the water supply tube from the fill
basin(Automatics only).
2. Remove the tank inlet fitting securing the fill basin
to the tank lid, remove fill basin and tank inlet
gasket. Set all three parts aside for reassembly.
3. On brewers with faucet, shut off water supply to
the brewer and disconnect the inlet and outlet
water lines to the faucet coil assembly.
4. Disconnect the wires from the tank heater termi-
nals and limit thermostat (automatics only).
6. Remove sprayhead and the hex nut securing the
sprayhead tube to the hood. Set aside for reas-
sembly.
7. Remove the eight #8-32 nuts securing the tank lid
to the tank.
8. Remove the tank lid with limit thermostat, spray-
head tube, tank heater and coil assembly (brewers
P2195.40
with faucet).
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 (automatics
only), sprayhead tube, tank heater, coil assembly
(brewers with faucet) using eight #8-32 hex nut.
12. Reconnect the inlet and outlet water lines to the
faucet coil assembly (brewers with faucet).
13. Secure sprayhead tube to hood using a hex nut.
14. Install sprayhead.
15. Reconnect the wires to the limit thermostat (auto-
matics only) and tank heater. See limit thermostat
section in this manual when reconnecting wires.
16. Install fill basin, secure with tank inlet fitting and
gasket. Insert water supply line through grommet
in fill basin (Automatics only).
17. Refer to Fig.13 when reconnecting the tank heater
wires.
Thermal Fuse to
RED from Tank
Heater Switch
FIG. 13 TANK HEATER TERMINALS
Page 19
Thermal Fuse to
BLK from Control
Thermostat
P1134.65
10690.1 063000