Lennox G61MPVT-36B-070 Installation Instructions Manual page 14

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
*50mm diameter street elbow provided.
**80mm diameter reducing elbow provided.
***Limit pipe length to 50mm.
TYPICAL EXHAUST PIPE CONNECTIONS
HORIZONTAL DIRECT OR
NON−DIRECT VENT APPLICATIONS
(Horizontal Right−Hand Air Discharge Application Shown)
*Limit pipe length to
50mm in G61MPVT−110
and −135 applications.
TRANSITION
DO NOT transition from
smaller to larger pipe
size in horizontal runs.
FIGURE 16
(Right−Hand Exit in Upflow Application Shown)
50mm
PLUG
50mm
50mm
CONDENSATE
TRAP
(Must be installed
on same side as
exhaust piping)
FIGURE 15
G61MPVT−36B−070
G61MPVT−60C−090
80mm
G61MPVT−60C−110*
G61MPVT−60D−135*
50mm
50mm
50mm
G61MPVT−36B−070
G61MPVT−60C−090
50mm
80mm
TRANSITION
50mm***
50mm*
G61MPVT−110
with
80mm vent pipe
Intake Piping
G61MPVT furnaces, with the exception of the
G61MPVT−60D−135, can be installed as either a Non−Di-
rect Vent or a Direct Vent gas central furnace. The
G61MPVT−60D−135 can only be installed as a Direct
Vent (two pipe) gas central furnace. In non−direct vent ap-
plications, when intake air will be drawn into the furnace
from the surrounding space, the indoor air quality must be
considered and guidelines listed in Combustion, Dilution
and Ventilation Air section must be followed.
The G61MPVT unit is designed for either left−side or right−
side air intake connections in either upflow or downflow ap-
plications. In horizontal applications, air intake must be
brought in through the top. Intake air piping is independent
of exhaust piping.
Follow the next four steps when installing the unit in direct
vent applications, where combustion air is taken from
outdoors and flue gases are discharged outdoors.
1 − Cement intake piping in slip connector located on the
side of the burner box.
2 − Use a sheet metal screw to secure the intake pipe to
the connector, if desired. A pilot indentation is pro-
vided in the slip connector to assist in locating and
starting the fastener.
3 − Glue the provided 50mm plug into the unused air intake
connector on the opposite side of the cabinet.
4 − Route piping to outside of structure. Continue with
installation following instructions given in general
guide lines for piping terminations and in intake and
exhaust piping terminations for direct vent sections.
Refer to figure 17 for pipe sizes.
Page 14
80mm
G61MPVT−070
TRANSITION
or 090 with 80mm
vent pipe
50mm
50mm
50mm
80mm**
G61MPVT−135
with
80mm vent pipe
80mm