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6
System piping
Figure 6-7 Double Heater - Single Tank
COLD WATER
SUPPLY
EXPANSION
TANK
MIXING VALVE
HOT WATER
SUPPLY
THERMOMETER
UNION
(TYPICAL)
TEMPERATURE
& PRESSURE
RELIEF VALVE
STORAGE
TANK
(continued)
DRAIN
Installation & Operation Manual
Number of Units
Model
2
3
4
Required Pipe Sizes in NPT
150
1 1/2"
2"
2"
199
1 1/2"
2"
2 1/2" 2 1/2"
285
2"
2 1/2" 2 1/2"
399
2 1/2"
3"
3"
500
2 1/2"
3"
4"
WATER HEATER
CIRCULATOR
(TYPICAL)
5
6
7
8
2 1/2" 2 1/2"
3"
3"
3"
3"
4"
3"
3"
4"
4"
4"
4"
5"
5"
4"
4"
5"
6"
WATER
HEATER
(TYPICAL)
BALL VALVE
(TYPICAL)
FLOW CHECK
VALVE (TYPICAL)
BUILDING
RETURN
33
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