Installation & Operation Manual
6 System piping (continued)
Figure 6-8 Double Heater - Double Tank
COLD WATER
SUPPLY
EXPANSION
TANK
FLOW CHECK
VALVE (TYPICAL)
BUILDING 
RETURN
HOT WATER
SUPPLY
THERMOMETER
MIXING VALVE
UNION 
(TYPICAL) 
TEMPERATURE & PRESSURE RELIEF VALVE (TYPICAL)
STORAGE TANK (TYPICAL)
DRAIN (TYPICAL)
|
|
| Number of Units |
|
| ||
Model | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|
| Required Pipe Sizes in NPT |
| ||||
151 | 1 1/2" | 2" | 2" | 2" | 2 1/2" | 3" | 3" |
200 | 1 1/2" | 2" | 2 1/2" | 2 1/2" | 3" | 3" | 4" |
286 | 2" | 2 1/2" | 2 1/2" | 3" | 3" | 4" | 4" |
400 | 2 1/2" | 3" | 3 1/2" | 4" | 4" | 5" | 5" |
501 | 3" | 3 1/2" | 4" | 5" | 5" | 5" | 6" |
601 | 3" | 3 1/2" | 4" | 5" | 5" | 5" | 6" |
701 | 3" | 4" | 5" | 5" | 6" | 6" | 6" |
801 | 3" | 4" | 5" | 6" | 6" | 6" | 6" |
WATER
HEATER (TYPICAL)
FLOW SWITCH (TYPICAL)
WATER HEATER CIRCULATOR (TYPICAL)
BALL VALVE (TYPICAL)
CAUTION
The piping will not support the weight of the water heater circulator pump. Do not attempt to support the weight of the water heater circulator pump with the piping or its accessories. Refer to the pump manufacturer’s installation instructions. Failure to comply could result in severe personal injury, death, or substantial property damage.
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.
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