Page 11
unit from operating properly. Longer run times of at least 5
minutes will alleviate most icing problems. Also, a heating
cable may be installed on exhaust piping and termination to
prevent freeze-ups. Heating cable installation kit is avail-
able from Lennox. See Condensate Piping section for part
numbers.
NOTE - Care must be taken to avoid recirculation of exĆ
haust back into intake pipe.
6 - On field supplied terminations for side wall exits, exĆ
haust piping should extend a maximum of 12 inches
(305mm) beyond the outside wall. Intake piping
should be as short as possible. See figure 9.
FIGURE 9
1/2 (13) ARMAFLEX
INSULATION IN
UNCONDITIONED SPACE
2 (51) PVC 1-1/2 (38) PVC
12 (305) MIN.
2 X 1-1/2
(51 x 38)
PVC REDUCER
1/2 (13) ARMAFLEX
INSULATION
6 (152)
MAXIMUM
2 (51) PVC
COUPLING
8 (203)
MINIMUM
OUTSIDE
WALL
Inches (mm)
TOP VIEW
WALL RING KIT
(15J74) LB-49107CB for 2 (50.8) Venting
7 - On field supplied terminations, a minimum separation
distance between the end of the exhaust pipe and the
end of the intake pipe is 8 inches (203mm).
8 - If intake and exhaust piping must be run up a side wall
to position above snow accumulation or other obĆ
structions. Piping must be supported every 3 feet
(.91m) as shown in figure 15. Refer to figures 13 and
14 for proper piping method. WTK wall termination kit
must be extended for use in this application. See figĆ
ure 18 or use kit WTKX shown in figure 19. When exĆ
haust and intake piping must be run up an outside
wall, the exhaust piping is reduced to 1-1/2 inches
(38mm) after the final elbow. The intake piping may
be equipped with a 90° elbow turndown. Using turnĆ
down will add 5 feet (1.5m) to the equivalent length of
the pipe.
FIGURE 10
TOP VIEW
WALL TERMINATION
(22G44) LB-49107CD for 2 (50.8) Venting
(44J40) LB-65701A for 3 (76.2) Venting
Inches(mm)
OUTSIDE WALL
1/2 (12.7) FOAM INSULATION
IN UNCONDITIONED SPACE
Optional Turndown
Shown
(Intake Only)
FIGURE 11
12 (305) ABOVE
AVERAGE SNOW
ACCUMULATION
EXHAUST
EXHAUST
TERMINATION
INTAKE
TERMINATION
INTAKE
Inches (mm)
CONCENTRIC ROOFTOP TERMINATION
(60G77) LB-49107CE for G26-50 & -75 Units Only
(33K97) LB-87942 for G26-100 & -125 Units Only
FIGURE 12
EXHAUST
EXHAUST
TERMINATION
INTAKE
TERMINATION
INTAKE
12 (305) Min.
above grade.
CONCENTRIC WALL TERMINATION
(60G77) LB-49107CE for G26-50 & -75 Units Only
(33K97) LB-87942 for G26-100 & -125 Units Only
Inches (mm)
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