Lochinvar 51-211 operation manual Number of Units

Installation & Operation Manual

6 Hydronic piping (continued)

Figure 6-4Multiple Boilers - Single Temperature Zoned with Circulators

Model

Number of Units

2

3

4

5

6

7

8

Required Pipe Sizes

51

1"

1-1/4"

1-1/2"

2"

2"

2"

2"

81

1-1/4"

1-1/2"

2"

2"

2-1/2"

2-1/2"

2-1/2"

ZONE #1

106

1-1/2"

2"

2"

2-1/2"

2-1/2"

2-1/2"

3"

151

2"

2"

2-1/2"

2-1/2"

3"

3-1/2"

3-1/2"

PRESSURE

211

2"

2-1/2"

3"

3-1/2"

3-1/2"

4"

4"

REDUCING VALVE

PRESSURE

ZO

NE

#2

ZO

NE

#3

ZO

NE

#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
			IN

PRESSURE

RELIEF VALVE

BOILER 2	BOILER 1
(MEMBER 1)
	(LEADER)

TEMPERATURE /			INDIRECT
	DRAIN	UNION	DHW TANK
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.

41