Existing Common Venting Guidelines - Slant/Fin VGH-299-CH Installation And Service Manual

Existing Common Venting Guidelines.

Do not common vent the VGH boiler with the vent pipe of any other boiler or appliance. However, when an existing
boiler is removed from an existing common venting system, the common venting system is likely to be too large
for proper venting of the appliances remaining connected to it. 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:
1) Seal any unused openings in the common venting system.
2) 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.
3) 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.
4) Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so
appliance will operate continuously.
5) 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.
6) 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.
7) Any improper operation of the common venting system must be corrected so the installation conforms
with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural Gas and
Propane Installation Code. When resizing any portion of the common venting system, the common venting
system must be resized to approach the minimum size as determined using the appropriate tables in
Chapter 13 in the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural Gas
and Propane Installation Codes.
E93.1601EN032.C VGH installation manual 55