Lochinvar WH 55-399 Hydronic piping, Number of Units, Required Pipe Sizes, Model, Notice

Installation & Operation Manual

6 Hydronic piping

Figure 6-7Multiple Boilers - Single Temperature Zoned with Circulators - DHW Priority

			Number of Units
Model	2	3	4	5	6	7	8
		Required Pipe Sizes
55	1-1/4"	1-1/2"	1-1/2"	2"	2"	2"	2"
85	1-1/4"	1-1/2"	2"	2"	2"	2-1/2"	2-1/2"
110	1-1/2"	2"	2"	2-1/2"	2-1/2"	2-1/2"	3"
155	2"	2"	2-1/2"	2-1/2"	3"	3"	4"
199	2"	2"	2-1/2"	3"	4"	4"	4"
285	2-1/2"	2-1/2"	3"	4"	4"	4"	5"
399	2-1/2"	3"	4"	4"	5"	5"	5"

		ZONE #1
PRESSURE
REDUCING VALVE	PRESSURE	ZONE #2 ZONE #3 ZONE #4
BACKFLOW	GAUGE
PREVENTER
MAKE UP				FLOW CHECK
WATER
				VALVE
SYSTEM SUPPLY				(TYPICAL)
SENSOR
AIR SEPARATOR				ZONE CIRCULATORS
				(TYPICAL)
	EXPANSION
		TANK
BALL VALVE		MAY SUBSTITUTE LOW LOSS HEADER
(TYPICAL)		NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
DRAIN POINT
(TYPICAL)			ANTI-SCALD
				HOT
		Y-STRAINER	MIXING VALVE
				WATER
		(RECOMMENDED)
				OUT
		(TYPICAL)	DOMESTIC
			HOT WATER
BOILER			CIRCULATOR	COLD
CIRCULATOR				WATER
	PRESSURE			IN
RELIEF VALVE

BOILER 2	BOILER 1
(MEMBER 1)	(LEADER)

					INDIRECT
			DRAIN
TEMPERATURE /					DHW TANK
				UNION
	PRESSURE		(TYPICAL)
		GAUGE

NOTICE

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.

42