Combustion Air And Vent Piping; Removal Of Existing Boiler From Common Vent System; Venting Materials - HELIX VX-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:
• USA - National Fuel Gas Code, ANSI 223.1/NFPA 54.
• Canada - Natural Gas and Propane Installation Code,
CAN/CSA B149.1
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 deficiencies
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
bathroom exhaust so they will operate at maximum
speed. Do not operate summer exhaust fan. Close
fireplace 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 flame 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

21
• Any improper operation of common venting system
should be corrected so installation conforms with National
Fuel Code, ANSI Z223.1/NFPA 54 and/or Natural Gas
and Propane Installation Code, CAN/CSA B149.1.
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 and/or Natural Gas and Propane Installation
Code, CAN/CSA B149.1.

6.3 Venting Materials

• See Table 4
Table 4 - Combustion air and vent pipe fittings
must conform with the following:
Item Material
PVC schedule 40
PVC - DWV
CPVC schedule 40
SDR-21 & SDR-26 PVC
Vent Pipe
and Fittings
ABS-DWV
Schedule 40ABS
PP (Polypropylene)
Pipe and Components
PVC
Pipe
Cement/ CPVC
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.
Use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel
(Polyphenolsulfone) in venting systems shall be prohibited.
!
WARNING
Use of cellular core PVC for venting flue gas could
result in death, or serious injury.
!
WARNING
Covering non-metallic vent pipe and fittings with
thermal insulation shall be prohibited.
Standards
ANSI/ASTM D1785
ANSI/ASTM D2665
ANSI/ASTM D1784/
F441
ANSI/ASTM D2241
ANSI/ASTM D2661
ANSI/ASTM F628
UL 1738
ULC S636-08
ANSI/ASTM D2564
ANSI/ASTM F493
ANSI/ASTM D2235
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