Tank Heater - Bunn CWT Twin Operating & Service Manual

SERVICE (cont.)

TANK HEATER

FIG. 14 TANK HEATER
Location:
The tank heaters are 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 black
and red wires on the tank heater. Connect the
brewer to the power source. The indication must
be:
a) 240 volts ac for three wire 120/240 volt mod-
els.
b) 200 volts ac for two wire 200 volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for three wire three phase 230 volt
models.
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 Diagrams and check wiring harness.
4. Disconnect the black wire and 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
1
2
3
4
5
P2197
1. Splash Guard
2. Tank Inlet Fitting
3. Tank Inlet Gasket
4. Fill Basin
5. Fill Tube Assembly
Removal and Replacement:
1. Disconnect the water supply tube (5) from the fi ll
basin (4).
2. Remove the tank inlet fi tting (2) securing the fi ll
basin (4) to the tank lid, remove fi ll basin (4),
splash guard (1) and tank inlet gasket (3). Set all
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 black wire on the limit thermostat
from the tank heater switch. On late model brew-
ers also disconnect the blue wire from the limit
thermostat to the control thermostat.
5. Disconnect the black wire and red wire from the
tank heater terminals.
Page 21
FIG. 15 FILL BASIN
P1238
10737 120800