Roper Ent Lue And Piping Practices; Termination Locations - Goodman *MVM96 Installation Instructions Manual

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 3 1/
16" minimum from the plane of one opening to the centerline of the
other opening for 2" diameter pipe, and 4 9/16" minimum for 3"
pipe.
The use of two short radius 45 degree elbows is permitted to
provide clearance to refrigerant piping above the furnace.
P V /F C
ROPER ENT LUE AND
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 sag-
ging, joint separation, and/or detachment from the furnace. Hori-
zontal runs of vent/flue and combustion air piping must be prop-
erly supported. PVC pipe supports must be no more than 5'
apart. For ABS pipe, supports must be no more than 3' apart.
Horizontal pipe runs must maintain a 1/4 inch per foot downward
slope, back towards the furnace, to properly return condensate to
the furnace's drain system.
PREFERRED
ACCEPTABLE
A P P
OMBUSTION IR IPING RACTICES
TRANSITION NO LESS
THAN 45 DEGREES TO
HORIZONTAL PLANE TO
AVOID CREATING A WATER
TRAP IN VENT PIPING.
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 temperatures below 35°F for extended
periods of time must be insulated with 1/2" thick closed cell foam.
Also, all vent/flue piping exposed outdoors in excess of the termi-
nations shown in this manual (or in unheated areas) must be insu-
lated with 1/2" thick closed cell foam. Inspect piping for leaks
prior to installing insulation.
T L
ERMINATION OCATIONS
NOTE: Refer to Location Requirements and Considerations for
combustion air contaminant restrictions.
The following bullets and diagram describe the restrictions con-
cerning the appropriate location of vent/flue pipe and combustion
air intake pipe (when applicable) terminations. Refer to Non-Direct
Vent (Single Pipe) Piping and Direct Vent (Dual Pipe) Piping lo-
cated in this section for specific details on termination construc-
tion.
• All terminations (flue and/or intake) must be located at
least 12 inches above ground level or the anticipated
snow level.
• Vent terminations (non-direct and direct vent) must
terminate at least 3 feet above any forced air inlet located
within 10 feet.
NOTE: This provision does not apply to the combustion
air intake termination of a direct vent application.
• The vent termination of a direct vent application must
terminate at least 12 inches from any opening through
which flue gases may enter a building (door, window, or
gravity air inlet).
• The vent termination running vertically through a roof
must terminate at least 12 inches above the roof line (or
the anticipated snow level) and be at least 12 inches
from any vertical wall (including any anticipated snow
build up).
• A vent termination shall not terminate over public walkways
or over an area where condensate or vapor could create
a nuisance or hazard or could be detrimental to the
operation of regulators, relief valves, or other equipment.
• The combustion air intake termination of a direct vent
application should not terminate in an area which is
frequently dusty or dirty.
NOTE: In Canada, the current edition of CAN/CSA B149.1
takes precedence over the preceding termination restriction.
17
NO TRANSITION ON
HORIZONTAL PLANE,
THIS CREATES A
WATER TRAP AND
RESTRICTS FLUE
GASES