HTP EL-399 - Manual (Page 27)

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LP- 293 REV. 5.20.14
N. ZONING WITH CIRCULATORS
1. When using circulator zoning, connect the boiler to the system as shown in Piping Details, Part 4, Section G. NOTE: The boiler
circulator cannot be used for a zone. It must only supply the boiler loop.
2. Install a separate circulator for each zone.
3. Connect DHW (domestic hot water) piping to indirect storage water heater as shown in Piping Details.
O. MULTIPLE BOILERS
1. Connect multiple boilers as shown in Piping Details, Part 4, Section G.
2. All piping shown is reverse return to assure balanced flow throughout the connected boilers.
3. Each connected boiler must have its own circulator pump to assure adequate flow.
4. Connect DHW (domestic hot water) piping to indirect storage water heater as shown in Piping Details.
5. The system flow (secondary loop) must be greater than the boiler’s primary loop flow.
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.
3. This boiler must be vented with materials, components, and systems listed and approved for Category IV boilers.
Exhaust vent and intake pipes are to be piped separately. This boiler cannot share a common exhaust or intake with multiple
appliances. Failure to follow this instruction will result in substantial property damage, severe personal injury, or death.
NOTE: To avoid contamination often contained in indoor air, it is best to pipe all intake combustion air directly to the outdoors.
NOTE: If exhaust vent pipe system passes through an unheated space, such as an alcove or attic, the space must be heated or the
pipe must be insulated. The insulation must have an R value sufficient to prevent freezing of the condensate.
Improper seating of vent pipe gaskets can cause eventual gasket failure and exhaust gas leakage. Ensure the exhaust vent pipe is
properly beveled and seated before insertion into the flue adapter. Failure to do so could result in property damage, severe personal
injury, or death.