Bradford-White Corp TG-180E-N(X), TG-237E-N(X)A, TG-150E-N(X), TG237E-N(X), TG-199E-N(X) Flame Rod

	Table 17. Thermal Fuse / Overheat Switch.
Wire Color	Voltage	Resistance	Connector	Pin
			No.	Nos.
Red-Red	11-13 VDC	Below 1 ohms	F6	F6-
			H1	H12

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 µ amp scale and series your meter in line with the flame rod. You should read 1 µ 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 18. Outgoing Water Thermistor.
Wire Color		Voltage	Resistance	Connector	Pin
				No.	Nos.
White-White		n/a	See example	F5	3-4
			above
	Table 19. Heat Exchanger Temperature Thermistor.
Wire Color		Voltage	Resistance	Connector	Pin
				No.	Nos.
Pink-White		n/a	See example	F4	3-11
			above
	Table 20. Intake Air Thermistor (Indoor Model Only).
Wire Color		Voltage	Resistance	Connector	Pin
				No.	Nos.
Orange-White		n/a	See example	F3	3-12
			above
		Table 21. Surge Protector.
Wire Color		Voltage	Resistance	Connector	Pin
				No.	Nos.
Black-White		108-132 VAC	n/a	D2	1-3
Blue-Brown		108-132 VAC	n/a	D1	1-3

With the power off, you can check the continuity through the surge protector. Place a meter lead on the top pin #1 of the surge protector and pin #3 on the bottom of the surge protector. Check across the top pin #3 and the bottom pin #1. If you read continuity across these two points, the surge protector is good. If you do not get continuity, replace the surge protector.

	Table 22. Remote Controls.
Wire Color	Voltage	Resistance	Connector	Pin
			No.	Nos.
Terminals B1	10-13 VDC	1.5-3.0k ohms	B	1-3
		38