Lochinvar 51-211 operation manual Model

Installation & Operation Manual

6 Hydronic piping

Figure 6-7Multiple Boilers - Multiple Temperatures with DHW Piped as a Zone

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"
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		TEMPERATURE		TEMPERATURE		TEMPERATURE
BACKFLOW	REDUCING VALVE			LOOP #1		LOOP #2		LOOP #3
PREVENTER		PRESSURE
		GAUGE

MAKE
UP	SYSTEM
WATER
	SUPPLY
	SENSOR

MIXING VALVES

(TYPICAL)

AIR SEPARATOR

EXPANSION

TANK

MAY SUBSTITUTE

LOW LOSS HEADER

BALL VALVE

(TYPICAL)

DRAIN POINT

(TYPICAL)

Y-STRAINER (RECOMMENDED)

BOILER

CIRCULATOR

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

120VAC TO PUMPS
24V SIGNAL TO MIXING VALVES
WIRES TO LOOP SENSORS
MULTI-TEMP LOOP CONTROL
(OPTIONAL)
DOMESTIC HOT WATER	SHIELDED CABLE TO
CIRCULATOR	BOILER CONTROL
FLOW CHECK	ANTI-SCALD	HOT WATER
VALVE	MIXING VALVE	OUT

COLD

WATER

IN

PRESSURE

RELIEF

VALVE

BOILER	BOILER
DRAIN		INDIRECT
UNION	TEMPERATURE /	DHW TANK
(TYPICAL)	PRESSURE GAUGE	IMG00189

CAUTION

NOTICE

NOTICE

Mixing valves are required for the protection of low temperature loops.

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.

Please note that the installer is responsible for ensuring DHW prioritization when piped as a zone.

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