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SERVICE (cont.)
CONTROL THERMOSTAT
P2414
FIG. 3 CONTROL THERMOSTAT
Location:
The control thermostat is located inside the hood
on the left end of the mounting bracket.
Test Procedures:
1.
Disconnect the brewer from the power source.
2.
Locate the black wire on the control thermostat.
3.
Check the voltage across the black wire on the
control thermostat and the white wire on the tank
heater or the red wire on the tank heater with a
voltmeter. Plug-in the brewer to the power source.
The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 220 volts ac for two wire 220 volt models.
4.
Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the
wiring diagrams and check the brewer wiring harness.
5.
Locate the blue/black wire on the control thermo-
stat.
6.
Gently remove the capillary bulb and grommet
from the tank.
7.
Check the voltage across the blue/black wire of
the control thermostat and the white wire on the
tank heater or red wire on the tank heater with a
voltmeter when the control thermostat is turned
"ON" (fully counterclockwise for thermostat with
tee handle control or fully clockwise for thermo-
stats with control knob). Plug-in the brewer to
the power source. The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 220 volts ac for two wire 220 volt models.
Voltage must not be present across these terminals
when the thermostat is turned "OFF" (fully counter-
clockwise).
8.
Disconnect the brewer from the power source.
If voltage is present as described, reinstall the capillary
tube into the tank to the line 4.5" above the bulb, the
control thermostat is operating properly.
If voltage is not present as described, replace the
thermostat.
Removal and Replacement:
1.
Remove wires from control thermostat leads or
terminals.
BLU to BLU/BLK Lead
from Limit Thermostat
BLK to BLK Lead from
Terminal Block
EARLY MODELS
BLK to Terminal Block
BLU/BLK to
Limit Thermostat
or Thermal Cut-Off
P1252
FIG.4 CONTROL THERMOSTAT TERMINALS
Page 9
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