Lochinvar 51-211 operation manual Required Pipe Sizes

Installation & Operation Manual

6 Hydronic piping (continued)

Figure 6-6Multiple Boilers - Multiple Temperatures

Number of Units

Model 2 3 4 5 6 7 8

Required Pipe Sizes

51 1" 1-1/4" 1-1/2" 2" 2" 2" 2"

811-1/4" 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"

1512" 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"

				WIRES TO
				LOOP
	PRESSURE	TEMPERATURE	TEMPERATURE	SENSORS
				TEMPERATURE
BACKFLOW	REDUCING VALVE	LOOP #1	LOOP #2	LOOP #3
PREVENTER				MIXING VALVES
	PRESSURE			(TYPICAL)
	GAUGE
MAKE	SYSTEM
UP	SUPPLY
WATER	SENSOR

AIR SEPARATOR

	EXPANSION			24V
	TANK			SIGNAL
				TO MIXING
	MAY SUBSTITUTE			VALVES
	LOW LOSS HEADER
BALL VALVE	NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
(TYPICAL)		120VAC TO PUMPS
DRAIN POINT
(TYPICAL)	BOILER	MULTI-TEMP
	CIRCULATOR	LOOP CONTROL
		(OPTIONAL)
			SHIELDED CABLE TO
	FLOW CHECK	DOMESTIC	BOILER CONTROL
				HOT
	VALVE	HOT WATER	ANTI-SCALD	WATER
		CIRCULATOR	MIXING	OUT
Y-STRAINER			VALVE	COLD
(RECOMMENDED)				WATER
				IN
	BOILER	BOILER

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

IMG00188

CAUTION

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.

43