Venting - QHT Riva Installation, Operation And Service Instructions

9. Venting

The Riva is a mechanical draft, side wall vented boiler. There are two side wall flue
options available – separate and coaxial. The coaxial option has one configuration shown
on the next page. The separate option has two possible configurations shown on the
following pages. There is also a vertical roof venting option. Regardless of what vent kit
is installed, they should all conform to the Provisions for combustion and ventilation air in
accordance with section 5.3, Air for Combustion and Ventilation, of the National Fuel Gas
Code, ANSI Z223.1, or Sections 7.2, 7.3 or 7.4 of CAN/CGA B149, Installation Codes, or
applicable provisions of the local building codes.
If the Biasi Riva replaces a boiler that was attached to a common vent system, the
common venting system is likely to be too large for proper venting of the appliances
remaining connected to it. To ensure the remaining appliances will function properly, the
test procedure below should be followed:
At the time of removal of an existing boiler, the following steps shall be followed with
each appliance remaining connected to the common venting system placed in
operation, while the other appliances remaining connected to the common venting
system are not in operation.
Seal any unused openings in the common venting system.
A.
Visually inspect the venting system for proper size and horizontal pitch and
B.
determine there is no blockage or restriction, leakage, corrosion and other
deficiencies which could cause an unsafe condition.
insofar as is practical, close all building doors and windows and all doors between
C.
the space in which the appliances remaining connected to the common venting
system are located and other spaces of the building. Turn on clothes dryers and
any appliance not connected to the common venting system. Turn on any exhaust
fans, such as range hoods and bathroom exhausts, so they will operate at
maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.
Place in operation the appliance being inspected. Follow the lighting instructions.
D.
Adjust thermostat so appliance will operate continuously.
Test for spillage at the draft hood relief opening after 5 minutes of main burner
E.
operation. Use the flame of a match or candle, or smoke from a cigarette, cigar or
pipe.
After it has been determined that each appliance remaining connected to the
F.
common venting system properly vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers and any other gas-burning
appliance to their previous condition of use." (g) Any improper operation of the
common venting system should be corrected so the installation conforms with the
National Fuel Gas Code, ANSI Z223.1 and/or CAN/CGA B149, Installation Codes.
When resizing any portion of the common venting system, the common venting
system should be resized to approach the minimum size as determined using the
appropriate tables in Part 11 of the National Fuel Gas Code, ANSI Z223.1 and/or
CAN/CGA B149, Installation Codes.
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RIVA HEAT ONLY MANUAL - REV B