HTP EL-399NVWH - Manual (Page 26)

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LP- 346 REV. 3.20.14
Three Elite VWH Heaters with Two Storage Tanks
Figure 10
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. When using multiple heaters, see Tables 9 and 10 and Figure 6 for 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.
PART 5 – VENTING, COMBUSTION AIR, AND CONDENSATE REMOVAL
The boiler must be vented as detailed in this Venting Section. Ensure exhaust vent and intake piping complies with these instructions
regarding vent system. Inspect finished exhaust vent and intake piping thoroughly to ensure all joints are well secured, airtight, and
comply with all applicable code requirements, as well as with the instructions provided in this manual. Failure to properly install the vent
system will result in property damage, severe personal injury, or death.
A. GENERAL
This boiler is certified as a “Category IV” appliance, and requires a special venting system. The vent system will operate with a positive
pressure in the pipe. Exhaust gases must be piped directly outdoors using the vent materials and rules outlined in these instructions.
Do not connect vent connectors serving appliances vented by natural draft into any portion of mechanical draft systems operating under
positive pressure. Follow the venting instructions below carefully. Failure to do so will result in substantial property damage, severe
personal injury, or death.
1. Installation should be made in accordance with the regulations of the Authority Having Jurisdiction, local code authorities, and utility
companies which pertain to this type of water heating equipment.
2. Install the venting system in accordance with these instructions and with the National Fuel Gas Code, ANSI Z223.1/NFPA 54,
CAN/CGA B149, and/or applicable provisions of local building codes.