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508034-02
Issue 2135
Page 17 of 49
1. 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.
2. 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
See Figure 20, Figure 23 and Figure 24
The vent adapter must be must be attached to the exhaust
coupling on the furnace top panel. Use the provided bands.
See steps below.
1. Remove the caution sticker from vent adapter.
2. Fully insert vent adapter with both bands loosely
attached on the furnace exhaust coupling.
3. Insert PVC exhaust pipe through vent adapter. Ensure
vent pipe is fully seated into exhaust coupling.
4. Tighten both top and bottom bands to 40 in lbs. See
5. Tighten top band.
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.
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
Furnace
Top Band
(torque to 40in−lbs)
PVC
Exhaust Pipe
Top Panel
Bottom Band
(torque to 40in−lbs)
Vent
Adaptor
Furnace
Exhaust Coupling
Figure 20. Vent Adaptor to Exhaust Coupling
Vent Piping Guidelines
NOTE:
Allied Air has approved the use of DuraVent
®
and
Centrotherm manufactured vent pipe and terminations as
an option to PVC. When using the PolyPro
®
by DuraVent
or InnoFlue
®
by Centrotherm venting system the vent
pipe requirements stated in the unit installation instruction
– minimum & maximum vent lengths, termination
clearances, etc. – apply and must be followed. Follow
the instructions provided with PolyPro by DuraVent and
InnoFlue by Centrotherm venting system for assembly
or if requirements are more restrictive. The PolyPro by
Duravent and InnoFlue by Centrotherm venting system
must also follow the uninsulated and unconditioned space
The 95G1UHEX can be installed as either a Non-Direct
Vent or a Direct Vent gas central furnace.
NOTE:
In Non-Direct Vent installations, combustion air is
taken from indoors and flue gases are discharged outdoors.
In Direct Vent installations, combustion air is taken from
outdoors and flue gases are discharged outdoors.
Intake and exhaust pipe sizing -- Size pipe according
to Table 10 and Table 12A through Table 12B. Count all
elbows in side and outside the home. Table 10 lists the
minimum vent pipe lengths permitted. Table 12A through
Table 12B lists the maximum pipe lengths permitted.
Regardless of the diameter of pipe used, the standard roof
and wall terminations described in section Exhaust Piping
Terminations should be used. Exhaust vent termination
pipe is sized to optimize the velocity of the exhaust gas as