Dettson Chinook C15-M-V Instructions D'installation Et Manuel Du Propriétaire page 21

Figure 16 – Suggested heating cable insertion in vent
termination
7.3 DIRECT VENT
When this furnace is installed as a direct vent (2 pipes)
furnace, no special provisions for combustion air are
required.
Direct vent installations require a dedicated combustion
air and exhaust vent piping. The system is only using
outside air for combution.
The vent and combustion air pipe can terminate vertically,
through the roof or horizontaly through and outside wall.
Refer to figures for approved termination.
Penetration throught a roof requires appropriate sealing
and proper flashing.
In Canada, refer to manufacturer's instructions for
supporting ULC S636 venting. ABS can be used for the
combustion air pipe.
7.4 NON DIRECT VENT
All air for combustion comes directly to the furnace from a
space that is well ventilated with outdoor air (such as an
attic or crawlspace). In addition, other gas appliances
installed in the space with the furnace may require
outside air for combustion.
cannot be terminated in attics or crawlspaces that uses
ventilation fans designed to operate during the heating
season. If ventilation fans are present in these areas, the
combustion pipe must terminate outdoors as a direct vent
(2 pipe) system.
7.5 SPECIAL VENTING
REQUIREMENTS FOR
INSTALLATION IN CANADA
In Canada, S636 certified primers and cements must
be used and be of the same manufacturer of the S636
venting system. Do not mix primers and cements from
one manufacturer with a vent system from a different
manufacturer. Follow the manufacturer's instructions for
the use of primer and cement and never use primer or
cement beyond its expiration date.
The combustion air pipe
All fire stop and roof flashing used with this system must
be UL listed material.
Acceptability under Canadian standard CAN/CSA B149
requires full compliance with all installation instructions.
The authority having
authority, municipal building department, fire department,
etc.) should be consulted before installation to determine
the need to obtain a permit.
7.6 MATERIAL
USA:
Combustion air and vent pipe, fittings, primers and
solvents must conform to American National Standard
Institute (ANSI) and American Society for Testing and
Material (ASTM) and be of the same manufacturer. See
table 12
Table 12 – Approved Vent and Combustion air pipe
material USA installation
Material
PVC - DWV
PVC schedule 40
CPVC Schedule 40
SDR-21, SDR-26-26 PVC
ABS-DWV Schedule 40
Stainless steel (SS)
Polypropylene (PP)
All vent piping and combustion air piping MUST
conform to local and national codes.
Pipe cement must be PVC (ANSI/ASTM D2564) or
CPVC (ANSI/ASTM F493).
Primers must be PVC/CPVC (ANSI/ASTM F656).
CANADA:
Vent pipe installations in Canada must conform to
the requirements of CAN/CSA B149 code. PVC and
CPVC vent systems must be composed of pipe, fittings,
cements, and primers listed to ULC S636 and must be of
the same manufacturer.
Combustion air pipe can use ABS material meeting the
ASTM standard D2661 / CSA B181.1.
All vent piping and combustion air piping MUST conform
to local and national codes.
7.7 SIZE THE VENT AND
COMBUSTION AIR PIPES
Furnace combustion air and vent pipe connections are
sized for 2" pipe. Any pipe diameter change should be
made outside furnace casing in a vertical section of the
pipe. Any change in diameter to the pipe must be made
as close to the furnace as reasonably possible.
20
jurisdiction (gas inspection
Standards
ANSI/ASTM D2265
ANSI/ASTM D1785
ANSI/ASTM F441
ANSI/ASTM D2241
ANSI/ASTM D2661
UL-1738
UL-1738 and ULC-
S636