508146-01
Issue 2051
Page 3
3
of 7
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Venting Practices
* 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.
SCHEDULE 40
PVC - 5'
all other pipe* - 3'
Wall
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24” maximum
3/4” minimum
Wall Thickness Guidelines
NOTE -
ward unit a minimum of 1/4” (6mm) drop for each 12” (305mm).
Figure 21. Piping Suspension Guidelines
•
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.
Intake Piping (Figure 22 and Figure 23)
The
GUH97M
furnace may be installed only in direct vent
applications.
The
GUH97M
is designed for combustion air intake
through an inlet in the unit’s top cap. Intake air piping
is independent of exhaust piping.
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.
CAUTION
The exhaust vent pipe operates under positive pressure
and must be completely sealed to prevent leakage of
combustion products into the living space.
CAUTION
