507762-01
Issue 1907
Page 16 of 46
4. Tighten both top and bottom bands to 40 in-lbs. See
Route piping to outside of structure. Continue with
installation following instructions given in piping termination
section.
If the 95G1UHEX furnace replaces a furnace that was
commonly vented with another gas appliance, the size of
the existing vent pipe for that gas appliance must be
checked. Without the heat of the original furnace flue prod-
ucts, the existing vent pipe is probably oversized for the
single water heater or other appliance. The vent should be
checked for proper draw with the remaining appliance.
CHIMNEY
OR GAS
VENT
(Check sizing
for water
heater only)
FURNACE
WATER
HEATER
OPENINGS
(To Adjacent
Room)
REPLACING FURNACE THAT
WAS PART OF A COMMON
VENT SYSTEM
Figure 22.
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
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
e
d
i
s
t
u
o
e
d
i
s
n
i
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
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 23, Figure 26 and Figure 27
The appliance adapter must be attached to the exhaust
coupling on the furnace top panel. Use the provided straps.
See steps below.
1. Remove caution tag from vent adapter
2. Fully insert vent adapter with both bands loosely
attached onto furnace exhaust coupling.
3. Insert PVC exhaust pipe through appliance adapter.
Ensure vent pipe is fully seated into exhaust coupling.
