Lennox G51MP SERIES Installation Instructions Manual page 20

Suspend piping using hangers at a minimum of every 5
feet (1.52m) for schedule
40 PVC and every 3 feet
(.91m) for ABS−DWV, PVC−
DWV, SPR−21 PVC, and
SDR−26 PVC piping. A suit-
able hanger can be fabri-
cated by using metal or
plastic strapping or a large
wire tie.
3 − 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.
4 − Secure piping at the point where it exits the outside
wall or roof in order to prevent transmission of vibra-
tion to the structure.
5 − 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 conden-
sate collection trap and lines.
TYPICAL EXHAUST PIPE CONNECTIONS AND CONDENSATE TRAP INSTALLATION
IN UPFLOW OR DOWNFLOW DIRECT OR NON−DIRECT VENT APPLICATIONS
PLUG
VENT PLUG
(Must be
glued in
place)
PLUG
*2" diameter street elbow provided.
** Street elbow may be used on −045, −070 and −090.
STRAPPING
(metal, plastic
or large wire
ties)
FIGURE 22
(Right−Hand Exit in Upflow Application Shown)
2"
PLUG
or
2"
2" **2"
CONDENSATE
TRAP
TRANSITION
(Must be installed
on same side as
exhaust piping)
2−1/2", 3", OR 4"
FIGURE 23
Page 20
Exhaust Piping
NOTE − A 2" diameter PVC street ell is located on the
blower deck of the 48C−110 and 60C−110 units. In upflow
or downflow applications, the street ell must be glued
using transition solvent cement directly into the unit flue
collar. See figure 23. A 3" to 2" PVC reducing ell is located
on the blower deck of the 60D−135 units. In upflow or
downflow applications, the reducing ell must be glued
using transition solvent cement directly into the unit flue
collar.
1 − Choose the appropriate side for venting in upflow or
downflow positions. Exhaust piping exits from the top
of the unit in horizontal air discharge applications.
Glue the field−provided exhaust vent pipe (or provided
street ell or reducing ell in upflow or downflow applica-
tions) to the flue collar. All PVC cement joints should
be made according to the specifications outlined in
ASTM D 2855. Refer to pipe and fittings specifications
and gluing procedures.
2−1/2",
3", OR
4"
TRANSITION
2"
−045, −070, or
−090 with
2−1/2", 3", or 4"
2"
vent pipe
2−1/2",
3", OR
4"
TRANSITION
(use only if 4"
pipe is
required)
2"
*2"
−110 with
−135 with
3" OR 4" vent pipe
vent pipe
45° 45°
MAX MAX
SIDE VIEW
4"
2"
3" to 2" REDUCING ELBOW
(provided)