LP-551 Rev. 3.9.16
20
Figure 10 - VWH Boiler with Two Storage Tanks
Figure 9 - Three VHW Boilers with Two Storage Tanks
NOTES:
1. This drawing is meant to show system piping concept only.
Installer is responsible for all equipment & detailing required by local codes.
2. Boiler circulator must be rated for open loop application. Do not use cast-iron circulators.
3. Boiler circulator(s) operate continuously.
4. Piping to the water storage tank must be at least the size of the boiler return and supply connections.
5. See this manual for minimum pipe sizing.
6. All pumps are shown with isolation anges or full port ball valves for isolation. The alternative is standard anges with full port ball valves
and a separate ow check valve.
7. Install a minimum of 12 diameters of straight pipe upstream of all circulators and check valves.
8. Install vacuum relief valve in accordance with local code requirements.
9. All multiple boilers and multiple storage tanks must be installed with reverse return piping as shown.
10. Expansion tank must be rated for use with potable water.
11. Use either indirect/tank sensor or system/pipe sensor mounted on common return to the boiler.
12. Aquastat or system/pipe sensor connects to DHW sensor input on boiler.
The piping will not support the weight of the circulators. Refer to the circulator manufacturer’s instructions to properly support
the circulator. Failure to comply with these instructions could result in property damage, severe personal injury, or death.
An ASSE 1017 thermostatic mixing valve is recommended on all tanks if the hot water temperature leaving the tank is above
119
o
F. Failure to do so could result in substantial property damage, serious injury, or death.
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