Carrier 58HDX - Applicable ASTM Standards for Vent Materials; Sizing Combustion Air and Vent Pipe

Applicable ASTM Standards for Vent Materials
Cell Solvent
Materials sn ~ e. R Core | Fittings | Primer
P P Pipe Cement
D2468
ABS D1527 __ F628 & -- D2235
D2661
D2466
PVC D1785 | D2241 | F891 & F656 | D2564
D2665
CPVC F444 F442 -- F438 -- F493
ABS to
PVC -- -- -- -- -- D3138
NOTE:
1. In Canada, all pipe, fittings & cements must conform to
applicable CSA standards or to local codes having juris-
diction.
2. Only use solvent cements that are marked for use with the
specific venting material.
3. ABS to PVC transition joints REQUIRE a special solvent
cement that meets the requirements of ASTM D3138.
4. Refer to ASTM D2855 for general procedure to use for
cementing plastic pipe and fittings.
NOTE: In order to create a seal that allows future removal of
pipe, RTV sealant MUST be used on the inlet pipe where it
joins to the furnace.
NOTE: AI! vent piping MUST be installed in compliance with
local codes or ordinances, these instructions, good trade practices,
and codes of country having jurisdiction.
1. Determine the best routing and termination for the vent
pipe and air inlet pipe by referring to all of the instructions
and guidelines in this Section.
2. Determine the size required for the vent pipe and air inlet
pipe.
3. Loosely assemble all venting parts without adhesive (pipe
joint cement) for correct fit before final assembly.
4. Furnace shall be installed so as to prevent the accumula-
tion of condensate.
5. Use of vertical piping is preferred because there will be
some moisture in the flue gases that may condense as it
leaves the vent pipe (See Instructions For Horizontal
Vents).
6. The vertical vent pipe MUST be supported so that no
weight is allowed to rest on the combustion blower.
7. Exhaust vent piping or air inlet piping diameter MUST
NOT be reduced.
8. All exhaust vent piping from the furnace to termination
MUST slope upwards. A minimum of !/4” (6 mm) per foot
of run is required to properly return condensate to the fur-
nace drain system.
9. Use DWV type long radius elbows whenever possible, as
they provide for the minimum slope on horizontal runs and
they provide less resistance in the vent system. If DWV
elbows cannot be used, use two, 45° elbows when pos-
sible. On horizontal runs the elbows can be slightly mis-
aligned to provide the correct slope.
10. All horizontal pipe runs MUST be supported at least every
five feet with galvanized strap or other rust resistant ma-
terial. NO sags or dips are permitted.
11. All vertical pipe runs MUST be supported every six feet
where accessible.
12. The minimum pipe run length is 2’ (.6 M).
13. The piping can be run in the same chase or adjacent to
supply or vent pipe for water supply or waste plumbing. It
can also be run in the same chase with a vent from another
90+ furnace.
NOTE: In NO case can the piping be run in a chase where
temperatures can exceed 140° F (60° C). or where radiated heat
from adjacent surfaces would exceed 140° F (60° C).
14. The vent outlet MUST be installed to terminate in the
same atmospheric pressure zone as the combustion air in-
let.
15. The vent system can be installed in an existing unused
chimney provided that:
¢ Both the exhaust vent and air intake run the length of the
chimney.
¢ No other gas fired appliance or fireplace (solid fuel) is vented
into the chimney.
¢ The top of the chimney MUST be sealed flush or crowned up
to seal against rain or melting snow so ONLY the piping
protrudes.
¢ The termination clearances shown in Fig. 7 and 8 are
maintained.
16. Furnace applications with vertical vents requiring vent dia-
meter increaser fittings must have increaser fittings in-
stalled in vertical portion of the vent. Condensate will be
trapped in the vent if the vent diameter is increased prior
to having an elbow turned upward. This could cause nuis-
ance tripping of the pressure switch.
Combustion Air and Vent Piping Insulation
Guidelines
NOTE: Use closed cell, neoprene insulation or equivalent. If
Fiberglass or equivalent insulation is used it must have a vapor
barrier. Use R values of 7 up to 10’, (2.1 - 3.0 M) R-II if
exposure exceeds 10". If Fiberglass insulation is used, exterior to
the structure, the pipe MUST be boxed in and sealed against
moisture.
1. When the vent or combustion air pipe height above the
roof exceeds 30"(762 mm), or if an exterior vertical riser is
used on a horizontal vent to get above snow levels, the ex-
terior portion MUST be insulated.
2. When combustion air inlet piping is installed above a sus-
pended ceiling, the pipe MUST be insulated with moisture
resistant insulation such as Armaflex or other equivalent
type of insulation.
3. Insulate combustion air inlet piping when run in warm, hu-
mid spaces.
Sizing Combustion Air and Vent Pipe
Consult Table 3 to select the proper diameter exhaust and
combustion air piping. Exhaust and combustion air piping is sized
for each furnace BTUH size based on total lineal vent length (on
inlet or outlet side), and number of 90° elbows required. Two 45°
elbows can be substituted for one 90° elbow. The elbow or
elbows used for vent termination outside the structure ARE
counted, including elbows needed to bring termination above
expected snow levels. The elbow inside the furnace on the
58HDX IS NOT included in the count.