Lochinvar 151-286 operation manual Number of Units Model Required Pipe Sizes

Outdoor Knight Boiler Installation & Operation Manual

3 Hydronic piping

Figure 3-5Multiple Boilers - Single Temperature Zoned with Circulators

			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"
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"

ZONE #1

		PRESSURE
	REDUCING VALVE PRESSURE			ZONE #2 ZONE #3 ZONE #4
BACKFLOW			GAUGE
PREVENTER

		FLOW CHECK
MAKE UP WATER	SYSTEM SUPPLY	VALVE
	SENSOR	(TYPICAL)

AIR SEPARATOR
	ZONE CIRCULATORS
	(TYPICAL)
	EXPANSION
MAY SUBSTITUTE	TANK
LOW LOSS HEADER
BALL VALVE	NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
(TYPICAL)
DRAIN POINT
(TYPICAL)

	ANTI-SCALD	HOT
BOILER	MIXING VALVE	WATER
		OUT
CIRCULATOR
	DOMESTIC
	HOT WATER
Y-STRAINER	CIRCULATOR	COLD
		WATER
(RECOMMENDED)		IN
(TYPICAL)

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

NOTICE

IMG00371

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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