Lochinvar 3.5, 2.5 service manual 2Wiring Diagram

Installation & Operation Manual

12 Diagrams (continued)

Figure 12-2Wiring Diagram

	MODBUS
	BOARD
LARGE CONNECTION BOARD	X1-1
	X1-2

BOX DEPICTS OPTIONAL ITEMS

BOX DEPICTS

DUAL SENSOR

SINGLE HOUSING

						X1-3
SHIELD			17	CN6-3	GY	X6-3
MODBUS	A		18	CN6-2	R	X6-1
OPTION	B		19	CN6-1	PR	X6-2
SHIELD			20			X4-1	BK
RATE	+	0-10V	21			X4-2	T
OUT	-		22			X4-3
				CN3-4
BOILER	+		23
		0-10V		CN3-6			BL
PUMP OUT	-		24
				CN3-7			R
SYSTEM RETURN			25
				CN3-14			BL
SENSOR			26
				CN3-13			R
SYSTEM SUPPLY			27
				CN3-12			BR
SENSOR			28
				CN3-11			W
TANK			29
				CN3-10			OR
SENSOR			30
				CN3-9			OR/W
OUTDOOR			31
				CN3-8			P
SENSOR			32
				CN3-1			W
BMS	+		33
		0-10V		CN3-2			BL
IN	-		34
				CN3-3			BK
SYSTEM	+		35
		0-10V		CN3-5			Y/BK
PUMP IN	-		36
SHIELD			37			-T	BL
CASCADE	A		38
						INLET SENSOR
	B		39
SHIELD			40			-T	R/W
					OUTLET SENSOR (S9)
						-T	R
					OUTLET SENSOR (S1)
						-T	W
						FLUE SENSOR
						-T	GY
					FLUE SENSOR (S10)
		LCD				-T	GY
		DISPLAY			PRE-MIX SENSOR 1 (S11)
						-T	BR
					PRE-MIX SENSOR 1 (S13)
						-T	BK
					PRE-MIX SENSOR 2 (S12)
						-T	T
			CN3		PRE-MIX SENSOR 2 (S14)
		DU941
			CN1
			SMALL CONNECTION BOARD
ALARM			1
CONTACTS			2
RUN-TIME			3	CN1-4			R
CONTACTS			4	CN1-5			R
TANK			5	CN1-6			OR
THERMOSTAT			6	CN1-12			OR
ENABLE		R	7	CN1-10			BL
		W	8	CN1-11			BK
LOUVER			9	CN1-9			BR
PROVING			10	CN1-8			R
24 VAC LOUVER			11	CN1-7			Y
RELAY COIL			12	CN1-1		HIGH LIMIT	OR
AUX			13	CN1-2
						SWITCH
SWITCH 1			14	CN1-3		R	BL
AUX			15				R
SWITCH 2			16
						LWCO
						BOARD
						J3-6
		LWCO		TEST		J3-5
						J3-4	OR
		PROBE		SWITCH
			OR/BK	OR/BK		J3-3
			LWCO RESET			J3-2
				OR		J2-1
				OR		J2-2
			GPS1	OR		OR	BR
				GPS2			GPS3
			BLOWER PROVING			OR
			SWITCH (LARGE)
			BLOWER PROVING			T
			SWITCH (SMALL)
						PR
			BLOCKED FLUE
				SWITCH
						BK
			BLOCKED DRAIN
				SWITCH
						"X5"
					BLOCK WIRING
						IS MODEL
					DEPENDANT

INTEGRATED CONTROL
X8-20
X8-10
X7-8
X7-7
X8-13
X8-14
X8-12
X8-11
X8-5
X8-15
X8-6
X8-16
X8-7
X8-17
X8-18
X8-1
X8-3
X8-8
X8-2
X8-4
X8-9	X1-6
	X1-3
X7-1	X1-12
	X10-1
X7-5	X10-4
	X1-1
	X1-2
X7-2	X1-4
	X10-2
X7-6	X10-5
	X10-3
	X10-6
	X6-18
	X6-8
	X1-8
X4
X3-3
X3-4	X6-9
X3-1
	X6-17
X3-2
X6-1	X2-4
X6-11
X6-2
X6-14
X6-10
X6-13
X6-4
	X13-2
	X13-3
	X2-3
	X1-7
X6-3	X1-10
	X1-5
	X2-5
X6-5
X6-15
	X13-4
X6-12
X13-1
X6-6
X5-1
X5-7
X5-2	X11
X5-8
X5-3	USB
X5-9	INTERFACE
X5-4
X5-10
X5-5
X5-41
X5-6
X5-12

LOW VOLTAGE 120 VAC HIGH VOLTAGE

				1.5A EACH MAX
				SYSTEM PUMP
	120V			CONTACTOR
				BOILER PUMP
	SUPPLY
	GND			CONTACTOR
	L	N		DHW PUMP
				CONTACTOR
				JUNCTION
				BOX
	BK
	ON/OFF
	SWITCH
	BK
	W
	G
	PR
	T
	OR
	OR			GAS VALVE
	BL			(SMALL)
	R			GAS VALVE
	BL			(LARGE)
	R
	BK
GY
				BK
	SMALL
	BLOWER			1 2 3
	RELAY
				BLOWER
				(SMALL)
				1 2 3 4 5
	W
	T
T
	BK/W			G/W
	LARGE
	BLOWER	R/W		1 2 3
	RELAY
				BLOWER
				(LARGE)
		BK/W		1 2 3 4 5
	W/BK
	T
R			FLAME SENSE 2
R	SPARK		SPARK ROD
R	GENERATOR
P			FLAME SENSE 1
	FLUE DAMPER
	TRANSFORMER
BK
				FLUE DAMPER GND
		BL		1
				M
		Y		2
		OR		3
			24V
		TRANSFORMER
		BL
		Y

Notes:

1.All wiring must be installed in accordance with: local, state, provincial and national code requirements per either N.E.C. in USA or C.S.A. in Canada.

2.If any original equipment wire as supplied with the appliance must be replaced, it must be replaced with wire having same wire gauge (AWG) and rated for a minimum of 105°C. Exceptions: Replacement high vo ltage spark lead and ribbon cables must be purchased from the factory. Use of a non-approved spark lead or ribbon cables can lead to operational problems which could result in non-repairable damage to the integrated controller or other components.

3.Actual connector block locations may vary from those shown on diagrams. Refer to actual components for proper connector block locations when using diagrams to troubleshoot unit.

WIRING DIAGRAM LBL20280 REV A

59