Bunn T3A, T6A service manual SERVICE cont, Control Thermostat

SERVICE (cont.)				240 volt two wire models when the control ther-
CONTROL THERMOSTAT
				mostat is turned fully clockwise. Connect the
				brewer to the power source. The indication must
				be:
				a) 120 volts ac for two wire 120 volt models.
				b) 240 volts ac for two wire 240 volt models.
				c) 100 volts ac for two wire 100 volt models.
			8. Disconnect the brewer from the power source.
			If voltage is present as described, reinstall the capil-
			lary 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 ther-
			mostat.
	FIG. 8 CONTROL THERMOSTAT	P2207.40
			Removal and Replacement:
Location:			1. Remove both wires from the control thermostat
				terminals.
	The control thermostat is located inside hood on
			2. Remove the thermostat capillary bulb by firmly
the right side just behind the dilution timer.
				pulling up on the capillary tube at the tank lid. This
Test Procedures:				will disengage the grommet from the tank lid.
			3.	Remove the #8-32 screw holding the control ther-
1. Disconnect the brewer from the power source.
				mostat to its bracket.
2. Locate the blue/black wire on the control thermo-
			4. Slide the grommet to the line 4.5" above the bulb
	stat.
				on the new capillary tube.
3.	With a voltmeter, check the voltage across the blue/
			5. Insert the capillary bulb through the hole in the
	black wire on the control thermostat and the white
				tank lid and press the grommet firmly and evenly
	wire on the tank heater for 100 volt and 120 volt
				so that the groove in the grommet fits into the
	two wire models or red wire on the tank heater for
				tank lid.
	240 volt two wire models. Connect the brewer to
			6. Carefully bend the capillary tube so that the tube
	the power source. The indication must be:
				and bulb inside the tank are in a vertical position.
	a) 120 volts ac for two wire 120 volt models.
	b) 240 volts ac for two wire 240 volt models.		NOTE – The capillary tube must be clear of any elec-
	c) 100 volts ac for two wire 100 volt models.		trical termination and not kinked.
4. Disconnect the brewer from the power source.			7. Fasten the new control thermostat to its bracket.
If voltage is present as described, proceed to #5.			8. Refer to Fig. 9 when reconnecting the wires.
			9. Adjust the control thermostat as required.
If voltage is not present as described, refer to the
Wiring Diagrams and check the brewer wiring har-
ness.				BLK to Tank
5. Locate the black wire on the control thermostat.				Heater
6. Gently remove the capillary bulb and grommet
	from the tank.
7.	With a voltmeter, check the voltage across the			BLU/BLK to Limit
	black wire of the control thermostat and the white			Thermostat
	wire on the tank heater for 100 volt and 120 volt
	two wire models or red wire on the tank heater for			P1280
		Page 20		FIG. 9 CONTROL THERMOSTAT TERMINALS
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