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NOTES:
This furnace must not be connected to Type B, BW, or L vent
or vent connector, and must not be vented into any portion of
a factory-built or masonry chimney except when used as a
pathway for PVC as described later in this section.
Do not common vent this appliance with another appliance or
use a vent which is used by a solid fuel appliance.
Do not use commercially available "no hub connectors" other
than those shipped with this product.
It is the responsibility of the installer to follow the manufacturers'
recommendations and to verify that all vent/flue piping and
connectors are compatible with furnace flue products.
Additionally, it is the responsibility of the installer to ensure that all
piping and connections possess adequate structural integrity and
support to avoid flue pipe separation, shifting or sagging during
furnace operation.
Dual Certification: Nondirect/Direct Vent
This furnace is dual certified and may be installed as a nondirect
vent (single pipe) or direct vent (dual pipe) appliance. A nondirect
vent installation requires only a vent/flue pipe, while a direct vent
installation requires both a vent/flue pipe and a combustion air
intake pipe. Refer to the appropriate section for details
concerning piping size, length, number of elbows, furnace
connections and terminations.
Materials and Joining Methods
WARNING
Goodman 55
To avoid bodily injury, fire or explosion, solvent cements
must be kept away from all ignition sources (for example,
sparks, open flames and excessive heat) as they are
combustible liquids. Avoid breathing cement vapors or
contact with skin and/or eyes.
2" or 3" (5.1 cm or 7.6 cm) nominal diameter PVC Schedule
40 pipe meeting ASTM D1785, PVC primer meeting ASTM F656
and PVC solvent cement meeting ASTM D2564 specifications
must be used. Fittings must be DWV type fittings meeting ASTM
D2665 and ASTM D3311. Carefully follow the pipe
manufacturer's instructions for cutting, cleaning and solvent
cementing of PVC.
The use of Schedule 40 PVC Cellular Core (Foam Core) plastic
pipe is also acceptable as a flue/vent and intake pipe material.
PVC primer meeting ASTM F656 and PVC solvent cement
meeting ASTM D2564 specifications must be used. Fittings must
be DWV type fittings meeting ASTM D2665 and ASTM D3311.
Carefully follow the pipe manufacturer's instructions for cutting,
cleaning and solvent cementing of PVC.
As an alternative to PVC pipe, primer, solvent cement and fittings,
ABS materials which are in compliance with the following
specifications may be used. 2" or 3" (5.1 cm or 7.6 cm) ABS
Schedule 40 pipe must meet ASTM D1527 and, if used in
Canada, must be CSA approved. Solvent cement for ABS to ABS
joints must meet ASTM D2235 and, if used in Canada, must be
CSA approved. The solvent cement for the PVC to ABS transition
joint must meet ASTM D3138. Fittings must be DWV type fittings
meeting ASTM D2661 and ASTM D3311 and, if used in Canada,
must be CSA approved. Carefully follow the manufacturer's
instructions for cutting, cleaning, and solvent cementing PVC
and/or ABS.
14
All 90° elbows must be medium-radius (¹⁄₄ bend DWV) or
long-radius (long sweep ¹⁄₄ bend DWV) types conforming to
ASTM D3311. A medium-radius (¹⁄₄ bend DWV) elbow measures
3¹⁄₁₆" (7.8 cm) minimum from the plane of one opening to the
centerline of the other opening for 2" (5.1 cm) diameter pipe, and
4⁹⁄₁₆" (11.6 cm) minimum for 3" (7.6 cm) pipe.
Proper Vent/Flue and Combustion Air
Piping Practices
Adhere to these instructions to ensure safe and proper furnace
performance. The length, diameter and number of elbows of the
vent/flue pipe and combustion air pipe (when applicable) affects
the performance of the furnace and must be carefully sized. All
piping must be installed in accordance with local codes and
these instructions.
Piping must be adequately secured and supported to prohibit
sagging, joint separation and/or detachment from the furnace.
Horizontal runs of vent/flue piping must be supported every 36"
to 60" (91.4 cm to 1.5 m) and must maintain a ¹⁄₄" (6.4 mm) per
foot downward slope, back toward the furnace, to properly return
condensate to the furnace's drain system. Allowances should be
made for minor expansion and contraction due to temperature
variations. For this reason, particular care must be taken to
secure piping when a long run is followed by a short offset of less
than 40" (101.6 cm).
Precautions should be taken to prevent condensate from freezing
inside the vent/flue pipe and/or at the vent/flue pipe termination.
All vent/flue piping exposed to freezing temperatures below 35°F
(2ºC) for extended periods of time must be insulated with ¹⁄₂"
(1.3 cm) thick closed-cell foam. Also all vent/flue piping exposed
outdoors in excess of the terminations shown in this manual (or in
unheated areas) must be insulated with ¹⁄₂" (1.3 cm) thick
closed-cell foam. Inspect piping for leaks prior to installing
insulation.
Termination Locations
NOTE: Refer to "Location Requirements and Considerations" for
combustion air contaminant restrictions.
The following bullets and illustration describe the restrictions
concerning the appropriate location of vent/flue pipe and
combustion air intake pipe (when applicable) terminations. Refer
to "Nondirect Vent (Single Pipe) Piping and Direct Vent (Dual
Pipe) Piping" located in this section for specific details on
termination construction.
All terminations (flue and/or intake) must be located at least
12" (30.5 cm) above ground level or the anticipated snow
level.
Vent terminations (nondirect and direct vent) must terminate
at least 36" (91.4 cm) above any forced air inlet located within
10 ft (3 m).
NOTE: This provision does not apply to the combustion air
intake termination of a direct vent application.
The vent termination of a nondirect vent application must
terminate at least 48" (121.9 cm) below, 48" (121.9 cm)
horizontally from or 12" (30.5 cm) above any door, window or
gravity air inlet into any building.
The vent termination of a direct vent application must
terminate at least 12" (30.5 cm) from any opening through
which flue gases may enter a building (door, window or
gravity air inlet).
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