Amana GUIA Series Service Instructions Manual page 46

PRODUCT DESIGN
It is the responsibility of the installer to follow the manufac-
turers' recommendations and to verify that all vent/flue pip-
ing and connectors are compatible with furnace flue prod-
ucts. Additionally, it is the responsibility of the installer to
ensure that all piping and connections possess adequate
structural integrity and support to prevent flue pipe separa-
tion, shifting, or sagging during furnace operation.
DUAL CERTIFICATION: NON-DIRECT/DIRECT VENT
(90% FURNACES ONLY)
The 90% furnace is dual certified and may be installed as a
non-direct vent (single pipe) or direct vent (dual pipe) appli-
ance. A non-direct 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 appropri-
ate section for details concerning piping size, length, num-
ber of elbows, furnace connections, and terminations.
MATERIALS AND JOINING METHODS (90%
FURNACES ONLY)
WARNING
To avoid fire, explosion, or bodily injury, solvent ce-
ments must be kept away from all ignition sources (i.e.,
sparks, open flames, and excessive heat) as they are
combustible liquids. Avoid breathing cement vapors
or contact with skin and/or eyes.
Two or three inch nominal diameter PVC Schedule 40 pipe
meeting ASTM D1785, PVC primer meeting ASTM F656,
and PVC solvent cement meeting ASTM D2564 specifica-
tions must be used. Fittings must be DWV type fittings meet-
ing ASTM D2665 and ASTM D3311. Carefully follow the
manufacturer's instructions for cutting, cleaning, and sol-
vent 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. 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. Fit-
tings 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.
46
Rev. 1
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
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 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 insu-
lation.
TERMINATION LOCATIONS (90% FURNACES ONLY)
NOTES: Refer to Location Requirements and Consider-
ations section of this manual or the installation instructions
for combustion air contaminant restrictions.
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).