Combustion Air And Vent Piping; Removal Of Existing Boiler From Common Vent System; Materials; Pipe Installation - Dunkirk DKVLT-050 Installation, Operation & Maintenance Manual

6.1 General
This boiler requires a dedicated direct vent system.
Install combustion air and vent piping in accordance
with these instructions, authority having jurisdiction,
and National Fuel Gas Code, ANSI 223.1/NFPA 54.
Vent connections serving appliances vented by natural draft
shall not be connected into any portion of mechanical draft
systems operating under positive pressure.
Install vent system in accordance with these instructions.
6.2 Removal of Existing Boiler From Common
Vent System
When 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.
After removal of existing boiler, following steps shall
be followed with each appliance remaining connected to
common venting system placed in operation, while other
appliances remaining connected to common venting system
are not in operation:
• Seal any unused openings in common venting system.
• Visually inspect venting system for proper size and
horizontal pitch. Determine there is no blockage or
restrictions, leakage, corrosion and other defi ciencies
which could cause an unsafe condition.
• When practical, close all building doors, windows, and
all doors between space in which appliances remaining
connected to common venting system are located and
other spaces of building. Turn on clothes dryer and any
appliance not connected to common venting system.
Turn on exhaust fans, such as range hoods and bath-
room exhaust so they will operate at maximum speed.
Do not operate summer exhaust fan. Close fi replace
dampers.
• Turn on appliance being inspected. Follow lighting
instructions. Adjust thermostat so appliances will operate
continuously.
• Test for spillage at draft hood relief opening after 5
minutes of main burner operation. Use fl ame of match or
candle, smoke from cigarette, cigar or pipe.
• Determine each appliance remaining connected to
common venting system properly vents when tested
as outlined above. Then return doors, windows,
exhaust fans and any other gas-burning appliance to
their previous condition of use.

6 - COMBUSTION AIR AND VENT PIPING

• Any improper operation of common venting system
should be corrected so installation conforms with National
Fuel Code, ANSI Z223.1/NFPA 54. When re-sizing any
portion of common venting system, common venting
system should be re-sized to approach minimum size as
determined using appropriate tables in Chapter 13 of the
National Fuel Gas Code, ANSI Z223.1/NFPA 54.

6.3 Materials

• See Table 3

6.4 Pipe Installation

Table 3 - Combustion air and vent pipe fi ttings
must conform with the following:
Item Material
PVC schedule 40
PVC - DWV
CPVC schedule 40
Vent Pipe
SDR-21 & SDR-26 PVC
and Fittings
ABS-DWV
Schedule 40
Pipe
Cement/
Primer
Schedule 40 ABS
• IPEX is approved vent manufacturer in Canada listed
to ULC-S636.
• IPEX System 636 Cements and Primers are approved
in Canada listed to ULC-S636.
DO NOT USE CELLULAR (FOAM) CORE PIPE
WARNING
!
Use of cellular core PVC for venting fl ue gas could
result in death, serious injury.
17
Standards
ANSI/ASTM D1785
ANSI/ASTM D2665
ANSI/ASTM D1784/
F441
ANSI/ASTM D2241
ANSI/ASTM D2661
ANSI/ASTM F628
PVC ANSI/ASTM D2564
CPVC ANSI/ASTM F493
ANSI/ASTM D2235