Minimum Vent Pipe Clearance; Removing Existing Boiler From Common Venting System - ECR Dunkirk PWB Series Manual

MINIMUM VENT PIPE CLEARANCE

Wood and other combustible materials must not be
closer than 6" from any surface of single wall metal
vent pipe. Listed Type B vent pipe or other listed
venting systems shall be installed in accordance with
their listing.
REMOVING EXISTING BOILER FROM COMMON
VENTING SYSTEM
When an existing boiler is removed from a 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.
CHIMNEY AND VENT PIPE CONNECTION
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
defi ciencies 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 fi replace
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 fl ame 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, fi replace dampers and
any other gas-burning appliance to their previous
conditions of use.
7. 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.
Vent connectors serving appliances vented by
natural draft shall not be connected into any
portion of mechanical draft systems operating
under positive pressure.
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