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D
C
: N
-D
UAL
ERTIFICATION
ON
This furnace is dual certified and may be installed as a non-direct
vent (single pipe) or direct vent (dual pipe) appliance. A non-
direct vent installation requires only a vent/flue pipe, while a
direct vent installation requires both a vent/flue pipe and a com-
bustion air intake pipe. Refer to the appropriate section for
details concerning piping size, length, number of elbows, fur-
nace connections, and terminations.
T
,
O AVOID BODILY INJURY
FIRE OR EXPLOSION
MUST BE KEPT AWAY FROM ALL IGNITION SOURCES
,
)
FLAMES
AND EXCESSIVE HEAT
A
VOID BREATHING CEMENT VAPORS OR CONTACT WITH SKIN AND
.
EYES
M
J
M
ATERIALS AND
OINING
Two- or three-inch nominal diameter PVC Schedule 40 pipe meet-
ing ASTM D1785, PVC primer meeting ASTM F656, and PVC sol-
vent 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 instruc-
tions for cutting, cleaning, and solvent cementing of PVC.
The use of Schedule 40 PVC cellular core DWV meeting ASTM
F891-1 or ABS 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 fol-
low the manufactures instructions for cutting, cleaning and sol-
vent cementing of PVC.
For Canadian installations; all PVC pipe, fittings and joining
materials must be UL S636 listed.
NOTE: Requirement does not apply to the combustion air
pipe.
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 solid
wall ABS Schedule 40 pipe must meet ASTM D1527 and, if
used in Canada, must be CSA listed or, two-or-three-inch
cellular core ABS Schedule 40 pipe must meet ASTM F628
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, clean-
ing, 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
16
/D
V
IRECT
IRECT
ENT
WARNING
,
SOLVENT CEMENTS
(
.
.,
I
E
SPARKS
AS THEY ARE COMBUSTIBLE LIQUIDS
ETHODS
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 permit-
ted to provide clearance to refrigerant piping above the
furnace.
P
V
/F
ROPER
ENT
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.
,
OPEN
.
Piping must be adequately secured and supported to prohibit
sagging, joint separation, and/or detachment from the fur-
/
OR
nace. Horizontal runs of vent/flue and combustion air pip-
ing must be properly 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.
ACCEPTABLE
C
A
P
LUE AND
OMBUSTION
IR
PREFERRED
Figure 6
TRANSITION NO LESS
THAN 45 DEGREES TO
HORIZONTAL PLANE TO
AVOID CREATING A WATER
TRAP IN VENT PIPING.
Figure 7
P
IPING
RACTICES
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