Goodman ACS series Service Instructions Manual page 42

PRODUCT DESIGN
As an alternative to PVC pipe, primer, solvent cement, and
fittings, ABS materials which are in compliance with the
following specifications may be used. Two or three inch ABS
Schedule 40 pipe must meet ASTM D1527 and, if used in
Canada, must be CSA listed. Solvent cement for ABS to
ABS joints must meet ASTM D2235 and, if used in Canada,
must be CSA listed. 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 listed. Carefully follow
the manufacturers' instructions for cutting, cleaning, and
solvent cementing PVC and/or ABS.
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.
Proper Vent/Flue and Combustion Air Piping
Practices (90% Furnaces Only)
Adhere to these instructions to ensure safe and proper fur-
nace performance. The length, diameter, and number of el-
bows 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 pro-
hibit sagging, joint separation, and/or detachment from the
furnace. Horizontal runs of vent/flue piping must be supported
every three feet and must maintain a 1/4 inch per foot down-
ward slope, back towards the furnace, to properly return
condensate to the furnace's drain system. Allowances should
be made for minor expansion and contraction due to tem-
perature 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 inches.
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
termperatures 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 terminations
shown in this manual (or in unheated areas) must be insu-
lated with 1/2" thick closed cell foam such as "Armaflex" or
"Insultube". Inspect piping for leaks prior to installing insula-
tion.
Termination Locations (90% Furnaces Only)
NOTES: Refer to Location Requirements and Considerations
section of this manual or the installation instructions for com-
bustion air contaminant restrictions.
42
The following bullets and diagram describe the restrictions
concerning the appropriate location of vent/flue pipe and com-
bustion air intake pipe (when applicable) terminations. Re-
fer to Non-Direct Vent (Single Pipe) Piping and Direct Vent
(Dual Pipe) Piping sections located in this manual or the
installation instructions for specific details on termination
construction.
• All terminations must be located at least 12 inches
above ground level or the anticipated snow level.
• Vent terminations must terminate at least 3 feet above
any forced air inlet located within 10 feet.
NOTE: This provision does not apply to the combus-
tion air intake termination of a direct vent application.
• The vent termination of a non-direct vent application
must terminate at least 4 feet below, 4 feet horizon-
tally from, or 1 foot above any door, window, or gravity
air inlet into any building.
• 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 of vent pipe run 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 antici-
pated snow build up).
• A vent termination shall not terminate over public walk-
ways 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 Canadian Fuel Gas Code takes pre-
cedence over the preceding termination restrictions.
OTHER THAN
COMBUSTION AIR
TERMINATION INTAKE
NON-DIRECT VENT
VENT/FLUE TERMINATION
10'
12"
3"
GRADE OR HIGHEST
12"
ANTICIPATED
SNOW LEVEL
12"
FORCED AIR
INLET
DIRECT VENT
VENT/FLUE TERMINATION
90% Furnace Vent Termination Clearances
NO TERMINATIONS
ABOVE WALKWAY
4'
4'
12"
NON-DIRECT VENT
VENT/FLUE TERMINATION