Lochinvar 51-211 operation manual Diagrams, 1 Ladder Diagram, Pc Interface

Installation & Operation Manual

13 Diagrams

Figure 13-1Ladder Diagram

120VAC				JUNCTION BOX							NEUTRAL GROUND
	TERMINAL STRIP									TERMINAL STRIP
	120V SUPPLY "L"									120V SUPPLY "N"
									1		2
KB ONLY	ON / OFF		INTEGRATED CONTROL					GND		BLOWER
	SWITCH					SYSTEM		SYSTEM
	X1-6		F2		X1-1					3
					X1-2	PUMP "L"		PUMP "N"
			3.15A
			F1				SYSTEM	GND
						BOILER	PUMP	BOILER
			5A	SYSTEM PUMP
					X1-4	PUMP "L"		PUMP "N"
				RELAY
				BOILER PUMP			BOILER	GND
				RELAY			PUMP
						DHW		DHW
				DHW PUMP	X1-3	PUMP "L"		PUMP "N"
			F3	RELAY
						TERMINAL		TERMINAL
			.8A	24V DC		STRIP	DHW	STRIP
	X5-9			SUPPLY	X5-1		PUMP
			120 VAC
	X4-3	3.5A	24 VAC
	KB 801				CONNECTION BOARD
		ONLY
											INTEGRATED
	CN5-5			LWCO							CONTROL
								FLOW		CN5-14	X4-8
			CN7-3			CN7-4	11	SWITCH	12	CN5-10	X4-12

24 VAC

			CN7-1		CN7-2
				HEAT/LOOPDEMAND 1				CN5-7		X4-1
			19		20
				HEAT/LOOPDEMAND 2				CN5-13		X4-9
			17		18
				HEAT/LOOPDEMAND 3				CN5-6		X4-2
			15		16
				TANK
				THERMOSTAT				CN5-12		X4-10
			13		14
				LOW GAS	HIGH GAS
				PRESSURE	PRESSURE
				SWITCH	SWITCH			CN5-11		X4-11
			10		9			CN5-3		X4-5
					INTEGRATED
						LOUVER
					CONTROL		5
						RELAY COIL
						24VAC	6
						LOUVER	7
						PROVING SWITCH		CN5-4		X4-4
					X7		8
				RIBBON CABLE
						KB 286 ONLY			X5-2
	PC INTERFACE					O-TEMP HEX SW	BLOCKED		X5-10
					X5-6		DRAIN SWITCH
				S2
			INLET
ALARM	BELL	1	SENSOR				AIR PRESSURE
					X5-4				X5-11
			OPERATING S1a				SWITCH
			SENSOR
			HIGH LIMIT	S1b	X5-12	GAS VALVE
									X2-2
			SENSOR

2

6

FLUE SENSOR

S3a

X5-5

X5-13

	GAS VALVE
X2-1	RELAY

FLUE

S3b

SENSOR

X5-14

13

CONNECTION

BOARD

BLOWER	1	X5-7
	2	X5-16

	ALARM		1		CN5-1		X4-7
CONTACTS			2		CN5-8		X4-14
			3		CN5-2		X4-6
	RUN-TIME
CONTACTS			4		CN5-9		X4-13
SYSTEM		S6	21		CN6		X6
SENSOR			22		CN6		X6
OUTDOOR		S5	23		CN6		X6
SENSOR			24
TANK		S4	26		CN6		X6
SENSOR			27		CN6		X6
SHIELD			29		CN6
	A		30				X6
CASCADE
	B		31		CN6		X6
SHIELD			32		CN6		X6
BMS +			33		CN6		X6
		0-10V
IN -			34		CN6		X6
					CN6
SYS PUMP	+		35				X6
		0-10V
IN	-		36		CN6		X6
BLR PUMP	+		37		CN6		X6
		0-10V
OUT	-		38		CN6		X6
RATE	+		39		CN6		X6
		0-10V
OUT	-		40
						M
SHIELD			41
	A		42	CN8-1	X6-1	O	X4-1	X9-2
						D
MODBUS B			43	CN8-2	X6-2	B	X4-2	X9-1
SHIELD			44	CN8-3	X6-3 U X4-3			X9-3
						S

4 X5-8

5 X5-15

TR2

X1-7

FLAME ROD

SPARK

ROD

CAUTION HIGH VOLTAGE SPARK LEAD

NOTES:

1.Where possible, switches are shown without utilities (gas, water or electricity) connected to the unit. As such, actual switch states may vary from those shown on diagrams depending upon whether utilities are connected or a fault condition is present.

2.See wiring diagram for additional notes.

BOX DEPICTS

OPTIONAL ITEMS

LOW VOLTAGE 120 VAC HIGH VOLTAGE

LADDER DIAGRAM

LBL20148 REV D

78