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Venting Practices
SCHEDULE 40
PVC - 5'
all other pipe* - 3'
* See table 2 for allowable pipe.
NOTE - Isolate piping at the point where it exits the outside wall or
roof in order to prevent transmission of vibration to the structure.
NOTE -
ward unit a minimum of 1/4" (6mm) drop for each 12" (305mm).
Wall Thickness Guidelines
24" maximum
3/4" minimum
n i
s
d i
e
Figure 21. Piping Suspension Guidelines
31-5000724 Rev. 0
Wall
o
u
s t
d i
e
2"
2"
2"
3"
or
TRANSITION
*2"
* When transitioning up in pipe size, use the shortest length of 2" PVC pipe possible.
NOTE − Exhaust pipe and intake pipe must be the same diameter.
Figure 22. Typical Exhaust Pipe Connections
•
In areas where piping penetrates joists or interior
walls, hole must be large enough to allow clearance on
all sides of pipe through center of hole using a hanger.
•
When furnace is installed in a residence where unit
is shut down for an extended period of time, such
as a vacation home, make provisions for draining
condensate collection trap and lines.
Exhaust Piping (Figure 22 and Figure 23)
Route piping to outside of structure. Continue with
installation following instructions given in piping termination
section.
Do not discharge exhaust into an existing stack or
stack that also serves another gas appliance. If vertical
discharge through an existing unused stack is required,
insert PVC pipe inside the stack until the end is even
with the top or outlet end of the metal stack.
The exhaust vent pipe operates under positive pressure
and must be completely sealed to prevent leakage of
combustion products into the living space.
DO NOT transition
from smaller to larger
pipe size in horizontal
runs of exhaust pipe.
NOTE: 1-1/2" Vent
Pipe Diameter Allowed
Only on 070 Units
1-1/2"
TRANSITION
*2"
Page 33
CAUTION
CAUTION
Exhaust
Air Intake
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