Venting - Biasi Riva Plus Installation And Operation Instructions Manual

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.
(a) Seal any unused openings in the common venting system.
(b) Visually inspect the venting system for proper size and horizontal pitch and determine
there is no blockage or restriction, leakage, corrosion and other deficiencies which
could cause an unsafe condition.
(c) Insofar as is practical, close all building doors and windows and all doors between 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.
(d) Place in operation the appliance being inspected. Follow the lighting instructions.
Adjust thermostat so appliance will operate continuously.
(e) Test for spillage at the draft hood relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle, or smoke from a cigarette, cigar or pipe.
(f) After it has been determined that each appliance remaining connected to the 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.
18 Riva Plus Manual