Lochinvar 151-286 operation manual Number of Units

Outdoor Knight Boiler Installation & Operation Manual

3 Hydronic piping

Figure 3-9Multiple Boilers - Single Temperature Zoned with Valves

						Number of Units
			Model	2	3	4	5	6	7	8
						Required Pipe Sizes
			151	2"	2"	2-1/2" 2-1/2"		3"	3"	3-1/2"
		ZONE #1	211	2"	2-1/2"	3"	3"	3-1/2"	4"	4"
			286	2-1/2"	2-1/2"	3"	3-1/2"	3-1/2"	4"	5"
	PRESSURE
BACKFLOW REDUCING VALVE			ZONE #2 ZONE #3 ZONE #4
PREVENTER	PRESSURE
BALL VALVE	GAUGE					ZONE VALVES
(TYPICAL)						(TYPICAL)
MAKE UP WATER	SYSTEM SUPPLY						DIFFERENTIAL
	SENSOR						PRESSURE BYPASS
	(WHEN USED)
							VALVE (IF USED)

AIR SEPARATOR

SYSTEM

CIRCULATOR

EXPANSION

TANK

	MAY SUBSTITUTE LOW LOSS HEADER
DRAIN POINT	NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
(TYPICAL)
		ANTI-SCALD	HOT
	BOILER	MIXING VALVE	WATER
			OUT
	CIRCULATOR
		DOMESTIC
		HOT WATER
		CIRCULATOR	COLD
	Y-STRAINER		WATER
	(RECOMMENDED)		IN
	(TYPICAL)

TEMPERATURE /	UNION
	(TYPICAL)
PRESSURE	DRAIN
GAUGE
BOILER 2	BOILER 1	INDIRECT
(MEMBER 1)	(LEADER)	DHW TANK

NOTICE

IMG00375

Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.

Indoor tank shown for illustration purposes.

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