Dunkirk WPSB SERIES II Operation & Maintenance Manual page 12

Removing Existing Boiler From Common Venting
System
When an existing boiler is removed from common venting
system, common venting system is likely to be too large for
proper venting of appliances remaining connected to it.
At time of removal of existing boiler, following steps shall
be followed with each appliance remaining connected to the
common venting system placed in operation, while other
appliances remaining connected to 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
conditions of use.
CHIMNEY AND VENT PIPE CONNECTION
7.
Vent connectors serving appliances vented by natural draft
shall not be connected into any portion of mechanical draft
systems operating under positive pressure.
12
Any improper operation of the common venting system
should be corrected so the installation conforms with
the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
When re-sizing any portion of the common venting
system, the common venting system should be re-sized
to approach the minimum size as determined using the
appropriate tables in Chapter 13 of the National Fuel
Gas Code, ANSI Z223.1/NFPA 54.