HTP EL-399NVWH - Manual (Page 23)

23
LP- 346 REV. 3.20.14
J. PIPING DETAILS
Elite VWH with Storage Tank
Figure 7
NOTES:
1. This drawing is meant to show system piping concept only.
Installer is responsible for all equipment & detailing required by local codes.
2. Heater circulator must be rated for open loop application. Do not use cast-iron circulators.
3. Heater circulator(s) operate continuously.
4. Piping to the water storage tank must be at least the size of the heater return and supply connections.
5. See Table 10 for minimum pipe sizing.
6. All pipes are shown with isolation flanges or full port ball valves for isolation. The alternative is standard flanges with full port ball valves and a
separate flow 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 heaters and multiple storage tanks must be installed with reverse return piping as shown.
10. Anti-scald rated mixing valve is recommended on all tanks if the hot water temperature leaving the tank is above 119
o F.
11. Expansion tank must be rated for use with potable water.
12. Use either indirect/tank sensor or system/pipe sensor mounted on common return to the heater.
13. Aquastat or system/pipe sensor connects to DHW sensor input on heater.