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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Lochinvar 51-211 operation manual Model