Venting Practices - Lennox G61MPVT-36B-070 Installation Instructions Manual

Venting Practices

1 − Use recommended piping materials for exhaust piping
(Class E / Class 12 / Schedule 40).
2 − Secure all joints so that they are gas-tight using ap-
proved cement.
Suspend piping using hangers at a minimum of every
1.52m (5 feet) for Schedule
40 vent pipe. A suitable
hanger can be fabricated
by using metal or plastic
strapping or a large wire tie.
3 − In areas where piping
penetrates joists or interi-
or walls, hole must be large enough to allow clearance
on all sides of pipe through center of hole using a
hanger.
4 − Isolate piping at the point where it exits the outside wall
or roof in order to prevent transmission of vibration 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.
Exhaust Piping (Figures 15 and 16)
NOTE − Two 50mm diameter street ells and two 80mm to
50mm reducers are contained in a bag assembly
strapped to the blower deck of 60C−110 and 60D−135
units. The street ells must be glued directly into the unit
flue collar. See figure 15. The 80mm to 50mm reducers
must be glued to the street ells in upflow or downflow
applications.
1 − Choose the appropriate side for venting in upflow or
STRAPPING
(metal, plastic
or large wire
ties)
2 − All horizontal runs of exhaust pipe must slope back to-
FIGURE 14
3 − On the opposite side of the cabinet, glue the provided
4 − Route piping to outside of structure. Continue with
Do not discharge exhaust into an existing stack or
stack that also serves another gas appliance. If verti-
cal discharge through an existing unused stack is re-
quired, insert PVC pipe inside the stack until the end
is even with the top or outlet end of the metal stack.
The exhaust vent pipe operates under positive pres-
sure and must be completely sealed to prevent leak-
age of combustion products into the living space.
Page 13
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. Refer to pipe and fittings speci-
fications and gluing procedures.
IMPORTANT
Exhaust piping and condensate trap must be
installed on the same side of the unit in upflow and
dowflow applications.
ward unit. A minimum of 6mm (1/4") drop for each
305mm (12 inches) of horizontal run is mandatory for
drainage. Horizontal runs of exhaust piping must be sup-
ported every 1.5m (5 feet) using hangers.
NOTE − Exhaust piping should be checked carefully to
make sure there are no sags or low spots.
50mm vent plug into the unused flue collar.
installation following instructions given in piping ter-
mination section.
CAUTION
CAUTION