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F F u u r r n n a a c c e e G G e e n n e e r r a a l l I I n n s s t t a a l l l l a a t t i i o o n n
Figure 3. Upflow Side Entry
Combustion air
intake
Field fabricated trap
Primary drain vent stack must
terminate below the bottom of
the condensate trap
To an approved
vented drain
Special Case Venting
S S p p e e c c i i a a l l i i n n s s t t r r u u c c t t i i o o n n s s f f o o r r d d i i r r e e c c t t v v e e n n t t f f u u r r n n a a c c e e a a i i r r
i i n n t t a a k k e e . .
In certain applications, particularly when the furnace is
located in a basement, there are certain conditions that
can be met where warm humid air from the outside is
drawn into combustion air piping. If the area where the
piping is located is conditioned below 70° F,
condensation could occur inside the piping and
ultimately drain into the furnace compartment, which
could lead to premature component failure.
We recommend following one of the options to prevent
this condition from occurring and possibly damaging
components within the furnace:
N N o o t t e e : : Inlet air piping is not considered to be part of the
venting system. The inlet air piping may be
made from PVC.
O O p p t t i i o o n n 1 1
If possible, slope the inlet combustion air piping away
from the furnace. Condensation that may occur will
now drain outside of the home. The combustion air
outlet piping must remain sloped back to the furnace.
N N o o t t e e : : Combustion air drain fitting must remain capped
if not using the drain function. See
Drain Instructions," p. 66
40
Combustion air
exhaust
"Condensate
section.
Option 1
Combustion air
exhaust
Combustion air
intake
Slope equals 1/4" per foot
Primary drain vent stack must
terminate below the bottom of
the condensate trap
To an approved
vented drain
O O p p t t i i o o n n 2 2 – – T T o o p p c c o o m m b b u u s s t t i i o o n n a a i i r r i i n n t t a a k k e e
If sloping the combustion air intake pipe is not
possible, install a DWV Tee as close to the furnace as
possible with drain and trap to prevent condensation
from occurring in the furnace cabinet. Do not tee AC
condensate and combustion air condensate trap
together.
N N o o t t e e : : Combustion air drain fitting must remain capped
if not using the drain function. See
Drain Instructions," p. 66
Option 2
Slope equals 1/4" per foot
Combustion air
exhaust
Combustion air
intake
Approved DWV Tee
Field fabricated trap
Primary drain vent stack must
terminate below the bottom of
the condensate trap
To an approved
vented drain
"Condensate
section.
A952V-SVX001-1B-EN
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