Condensate Piping - Lennox G43UF SERIES Unit Information

3. If exhaust piping must be run up a side wall to position
above snow accumulation or other obstructions, pip-
ing must be supported every 3 feet (.9m) as shown in
figure 18. Refer to figure 35 for proper piping method.
When exhaust piping must be run up an outside wall,
any reduction in exhaust pipe size must be done after
the final elbow.
Inches(mm)
UNCONDITIONED
SPACE
OUTSIDE WALL
PROVIDE SUPPORT
FOR EXHAUST LINES
EVERY 36" (914)
FIELD−PROVIDED
REDUCER MAY BE
REQUIRED TO
ADAPT LARGER
VENT PIPE SIZE TO
TERMINATION
1/2" (13) FOAM
INSULATION IN
UNCONDITIONED
SPACE
SIDE VIEW
NON−DIRECT VENT WALL RING TERMINATION
FIGURE 35
G43UF NON−DIRECT VENT APPLICATION
USING EXISTING CHIMNEY
SIZE TERMINATION
PIPE PER TABLE 14.
3" − 8"
(76mm−
203mm)
MINIMUM 12"
MINIMUM
(305mm) ABOVE 12" (304mm)
ABOVE AVERAGE
AVERAGE SNOW
SNOW ACCUMULATION
ACCUMULATION
SHEET
METAL TOP
PLATE
INSULATE
TO FORM
SEAL
NOTE − Do not discharge exhaust gases directly into any chimney or vent stack. If ver-
tical discharge through an existing unused chimney or stack is required, insert piping
inside chimney until the pipe open end is above top of chimney and terminate as illus-
trated. In any exterior portion of chimney, the exhaust vent must be insulated.
FIGURE 36

Condensate Piping

This unit is designed for either right- or left-side exit of con-
densate piping. A 5−1/2" service clearance is required for
the condensate trap. Refer to figure 37 for condensate trap
locations.
When possible, the condensate drain lines should be
routed within the conditioned space to avoid freezing of
condensate and blockage of the drain line. When conden-
12" (305) Max. for 2" (51)
Unless Supported
SIZE TER-
MINATION
PIPE PER
TABLE 14.
12" (305) ABOVE
AVERAGE SNOW
ACCUMULATION
1/2" (13) FOAM
INSULATION
(15F74)
STRAIGHT−CUT OR
ANGLE−CUT IN DIRECTION
OF ROOF SLOPE
EXHAUST VENT
1/2" (13mm)
WEATHERPROOF
INSULATION
SHOULDER OF FITTINGS
PROVIDE SUPPORT
OF PIPE ON TOP PLATE
3" − 8"
(76mm−
203mm)
EXTERIOR
PORTION OF
CHIMNEY
sate drain line must be routed through unconditioned
space, use an electric heat cable to prevent freezing of con-
densate.
CONDENSATE TRAP LOCATIONS
Optional
upflow
NOTE − When side return air filter is installed on
same side as the condensate trap, filter rack
must be installed beyond condensate trap to
avoid interference.
1 − Determine which side condensate piping will exit the
unit. Remove plugs from the condensate collar at the
appropriate location on the side of the unit.
NOTE − The condensate trap is factory−shipped with
two rubber O−rings and two rubber clean−out caps
installed. Check to make sure that these items are in
place before installing the trap assembly. O−rings must
be properly positioned between trap and cabinet to en-
sure seal between the condensate trap and the cabi-
net. It is not necessary to apply glue or sealant.
2 − Install condensate trap onto the condensate collar.
Use provided HI/LO screws to secure two upper
flanges of the trap to the collar. Use provided sheet
metal screw to secure bottom trap flange to side of
unit. See figure 38.
DO NOT use a power driver to tighten screws which
secure condensate trap to cabinet. Screws should
be hand−tightened using a screw driver to avoid the
possibility of damage to the trap assembly.
3 − Glue the field−provided coupling or pipe to the trap.
Install a tee and vent pipe near the trap.
NOTE − The condensate trap drain stubs (both sides)
have an outer diameter which will accept a standard
3/4" PVC coupling. The inner diameter of each stub
will accept standard 1/2" diameter PVC pipe.
NOTE − Vinyl tubing may be used for condensate
drain. Tubing must be 1−1/4" OD X 1" ID and should be
attached to the drain stubs on the trap using a hose
clamp.
Page 31
Optional
upflow
FIGURE 37
CAUTION