Lochinvar 51-211 operation manual Model Number of Units

Installation & Operation Manual

6 Hydronic piping

Figure 6-9Multiple Boilers Zoned with Valves

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"

211

2"

2-1/2"

3"

3-1/2"

3-1/2"

4"

4"

PRESSURE

BACKFLOW

REDUCING VALVE

ZONE #2 ZONE #3 ZONE #4

PREVENTER

PRESSURE

BALL VALVE

GAUGE

ZONE VALVES

(TYPICAL)

(TYPICAL)

MAKE UP WATER

DIFFERENTIAL

SYSTEM SUPPLY

PRESSURE BYPASS

SENSOR

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
		Y-STRAINER	MIXING VALVE
		(RECOMMENDED)		HOT
		(TYPICAL)	DOMESTIC	WATER
	BOILER	FLOW CHECK	HOT WATER	OUT
		VALVE	CIRCULATOR
	CIRCULATOR			COLD
	PRESSURE			WATER
				IN
	RELIEF VALVE
	BOILER 2		BOILER 1
			(LEADER)
	(MEMBER 1)
			INDIRECT
TEMPERATURE /		UNION	DHW TANK
PRESSURE	DRAIN
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.

46