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

Installation & Operation Manual

6 Hydronic piping (continued)

Figure 6-6Multiple Boilers - Single Temperature Zoned with Zone Valves - 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
BACKFLOW	REDUCING	ZONE #2 ZONE #3 ZONE #4
PREVENTER	VALVE	PRESSURE
BALL VALVE		GAUGE
		ZONE VALVES
(TYPICAL)		(TYPICAL)
	MAKE UP WATER
	SYSTEM SUPPLY	DIFFERENTIAL PRESSURE
		BYPASS VALVE
	SENSOR	(RECOMMENDED)
AIR SEPARATOR
		SYSTEM
EXPANSION		CIRCULATOR
	TANK

DRAIN POINT

(TYPICAL)

BOILER

CIRCULATOR

PRESSURE

RELIEF VALVE

MAY SUBSTITUTE LOW LOSS HEADER

NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART

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

COLD

WATER

IN

BOILER 2

(MEMBER 1)

BOILER 1 (LEADER)

INDIRECT

DHW TANK

TEMPERATURE /	DRAIN
	UNION
PRESSURE
GAUGE	(TYPICAL)

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.

41