Weil-McLain LGB-23 Wiring diagram, Universal Control System - Natural gas, Natural Gas, thru

Universal Control System – Natural gas

H		LADDER WIRING DIAGRAM							N	EQUIPMENT
										GROUND
				120 V.A.C.						(NOTE 10)
				HIGH
SERVICE SWITCH	OPERATING		LOW WATER	LIMIT
(BY OTHERS)	CONTROL		CUT-OFF	CONTROL	PRIMARY
R									C
					24 V.A.C.
					PRIMARY
R
					24 V.A.C.
					FIRING RATE CONTROL			MAIN GAS VALVE HIGH FIRE
						(WHEN USED)		OPERATOR (NOTE 6)
				MV				MV	MV/PV
				MV/PV		MAIN GAS VALVE LOW FIRE OPERATOR
				PV		PV			MV/PV
				GND
								(NOTE 6)
				(BURNER)
					24V		PV	MV/PV
					(GND)	SECONDARY GAS VALVE
					24V
				SENSE		MAIN FLAME SENSOR
				SPARK
			MV	NO. 1 BASE
				MAIN FLAME PROVING MODULE
			MV/PV					PILOT SOLENOID VALVE
		PV
HIGH GAS		GND
PRESSURE
	(BURNER)
SWITCH
		24V
(WHEN USED)							2
(NOTE 5)		(GND)
	1		24V
		SENSE		PILOT FLAME SENSOR
		SPARK
		NO. 1 BASE				PILOT BURNER
						(NOTE 9)
	PILOT PROVING MODULE
					FIRING RATE CONTROL			MAIN GAS VALVE HIGH FIRE
						(WHEN USED)		OPERATOR (NOTE 6)
				MV				MV	MV/PV
				MV/PV
						MAIN GAS VALVE LOW FIRE OPERATOR
				PV		PV			MV/PV
				GND
								(NOTE 6)
				(BURNER)
					24V		PV	MV/PV
						SECONDARY GAS VALVE
					(GND)
					24V
				SENSE		MAIN FLAME SENSOR
				SPARK
			MV	NO. 2 BASE
				MAIN FLAME PROVING MODULE
			MV/PV					PILOT SOLENOID VALVE
		PV
		GND
	(BURNER)
		24V					2
		(GND)
	1		24V
HIGH GAS				PILOT FLAME SENSOR
		SENSE
PRESSURE
SWITCH		SPARK
(WHEN USED)		NO. 2 BASE				PILOT BURNER
(NOTE 5)						(NOTE 9)
	PILOT PROVING MODULE
	LGB			Intermittent Pilot			A United Dominion Company
				Universal Control System
						Weil-McLain	500 Blaine St.		Michigan City, IN 46360-2388
Natural Gas				Steam or Water
				6 thru 23
					PART NUMBER			550-101-131/0798WM
	Part Number 550-141-916/1001

Figure 3

Wiring diagram

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