Bradford-White Corp TGHE-160I-N(X), TGHE-1991-N(X) instruction manual Flame Rod

	Table 18. (IG) Ignition System.
Wire Color	Voltage	Resistance	Connector	Pin
			No.	Nos.
Grey-Grey	90-110 VAC	n/a	D1	1-2
	Table 19. (FM) Combustion Fan Motor.
Wire Color	Voltage	Resistance	Connector	Pin
			No.	Nos.
Red-Black	6-45 VDC	n/a	L1	1-2
White-Black	5-10 VDC	9.2-9.4k ohms	L1	2-4
Yellow-Black	11-13 VDC	3.5-3.9k ohms	L1	2-3

Set your meter to the hertz scale. Reading across the white and black wires at terminals 2 and 4 you should read between 60 and 420 hertz.

	Table 20. Thermal Fuse / Overheat Switch.
Wire Color	Voltage	Resistance	Connector	Pin
			No.	Nos.
Red-White	11-13 VDC	Below 1 ohms	B1	B13-
			E1	E9

Flame Rod:

Place one lead of your meter to the flame rod and the other to ground. With the unit running, you should read between 5-150 VAC. Set your meter to micro-amp scale and series your meter in line with the flame rod. You should read 1 micro-amp or greater for proper flame circuit. In the event of low flame circuit, remove the flame rod and check for carbon or damage.

Heat Exchanger and Outgoing Water Temperature Thermistors:

Check all Thermistors by inserting meter leads into each end of the thermistor plug. Set your meter to the 20k scale and read resistance. Applying heat to the thermistor bulb should decrease the resistance. Applying ice to the thermistor bulb should increase the resistance. See below for examples of typical temperatures and resistance readings.

Example:		59ºF = 11.4-14kΩ	140ºF = 2.2-2.7kΩ
		86ºF = 6.4-7.8kΩ	221ºF = 0.6-0.8kΩ
		113º = 3.6-4.5kΩ
		Table 21. Outgoing Water Thermistor.
Wire Color		Voltage	Resistance	Connector	Pin
				No.	Nos.
White-White		n/a	See example	E4	E3-E4
			above
Blue-Blue		n/a	See example	E3	E6-E5
			above
	Table 22. Heat Exchanger Temperature Thermistor.
Wire Color		Voltage	Resistance	Connector	Pin
				No.	Nos.
Pink-Pink		n/a	See example	E2	5-10
			above
		Table 23. Surge Protector.
Wire Color		Voltage	Resistance	Connector	Pin
				No.	Nos.
Black-White		108-132 VAC	n/a	C2	1-3
White-White		108-132 VAC	n/a	C1	1-3

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