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 ex-
haust back into intake pipe.
6 - On field supplied terminations for side wall exits, ex-
haust piping should extend a maximum of 12 inches
(3O5mm) beyond the outside wall. Intake piping
should be as short as possible. See figure 9.
1/2 (13) ARMAFLEX
INSULATION IN
UNCONDITIONED SPACE
12 (305) MIN.
2 X 1-1/2
(51x 38)
1-1/2 30 _VC
2(011 _
0(J02)
1/2 (13) ARMAFLEX I
INSULATION MAXIMUM
Z2 21_ PVC
COUPLING
OUTSlOEJ
WALL MINIMUM [
Inches (ram) TOP VIEW
WALL RING KiT
(15J74) LB-49107CB for 2 (50.8) Venting
FIGURE 9
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 ob-
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 fig-
ure 18 or use kit WTKX shown in figure 19. When ex-
haust and intake piping must be run up an outside
wall, the exhaust piping is reduced to 1-1/2 inches
(38ram) after the final elbow. The intake piping may
be equipped with a 90° elbow turndown. Using turn-
down will add 5 feet (1.5m) to the equivalent length of
the pipe.
112 (12.7) FOAM INSULATION
IN UNCONDITIONED SPACE
Inches(mm)
Optional Turndown
Shown
(Intake Only)
TOP VIEW
WALL TERMINATION
(22G44) LB49107CD for 2 (50.8) Venting
(44J40) LB-65701A for 3 (76.2) Venting
FIGURE 10
EXHAUST
TERMINATION _ _ 12 (305) ABOVE
AVERAGE SNOW
ACCUMULATION
_INTAKE
TERMINATION
F.XHAUST INTAKE
CONCENTRIC ROOFTOP TERMINATION
(60G77) LB49107CE for G26-50 & -75 Units Only
(33K07) LB-87942 for G26-t00 & -125 Units Only
FIGURE 11
EXHAUST
Inches (mm)
EXHAUST
INATION
TERMINATION I
12(305)Mln,
CONCENTRIC WALL TERMINATION
(60G77) LB-49107CE for G26-50 & -75 Units Only
(33K97) LB-87942 for G26-100 & -t25 Units Only
FIGURE 12
Page 11
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