Lennox EL195UHNE Series Manual page 19

Venting Practices
Piping Suspension Guidelines
SCHEDULE 40
PVC - 5'
all other pipe* - 3'
* See Piping and Fittings Specifications table
NOTE - Isolate piping at the point where it exits the outside wall or
roof in order to prevent transmission of vibration to the structure.
Wall Thickness Guidelines
24" maximum
3/4" minimum
i s n d i e
FIGURE 18
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.
REPLACING FURNACE THAT WAS PART OF A
COMMON VENT SYSTEM
CHIMNEY
OR GAS
VENT
(Check sizing
for water
heater only)
FURNACE
(Replaced)
If replacing a furnace which 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
products, 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.
FIGURE 19
Wall
o u s t d i e
WATER
HEATER
OPENINGS
(To Adjacent
Room)
Page 19
Exhaust Piping (Figures 20, 23 and 24)
The vent adapter must be attached to the exhaust cou-
pling on the furnace top panel. Use provided bands. See
steps below.
1 - Remove the caution tag 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 40in-lbs.
NOTE - PVC / ABS / NORYL transition solvent cement
WELD-ON 4052 (or equivalent) must be used for con-
necting PVC exhaust pipe to NORYL furnace exhaust
coupling.
Route piping to outside of structure. Continue with instal-
lation following instructions given in piping termination
section.
CAUTION
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.
Flue Coupling To Exhaust Coupling
PVC
Exhaust Pipe
Top Band
(torque to 40in-lbs)
Bottom Band
(torque to 40in-lbs)
FIGURE 20
Flue Couplig
Furnace
Exhaust Coupling
Furnace
Top Panel