Typical Exhaust Pipe Connections And Condensate Trap Installation; Typical Exhaust Pipe Connections; Intake Piping - Lennox G61MPV Service Manual

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.
**3" diameter reducing elbow provided.
***Limit pipe length to 2".

TYPICAL EXHAUST PIPE CONNECTIONS

HORIZONTAL DIRECT OR
NON−DIRECT VENT APPLICATIONS
(Horizontal Right−Hand Air Discharge Application Shown)
*Limit pipe length to 2"
in G61MPV−110 and
−135 applications.
TRANSITION
DO NOT transition from
smaller to larger pipe
size in horizontal runs.
FIGURE 23
(Right−Hand Exit in Upflow Application Shown)
2"
PLUG
2"
2"
CONDENSATE
TRAP
(Must be installed
on same side as
exhaust piping)
FIGURE 22
G61MPV−36B−045
G61MPV−36B−070
2−1/2",
G61MPV−36B−071
3", OR
G61MPV−36C−090
4"
G61MPV−60C−090
G61MPV−60C−091
G61MPV−60C−110*
G61MPV−60C−111*
G61MPV−60D−135*
2"*
2"
2"
G61MPV−36B−045
G61MPV−36B−070
G61MPV−36B−071
2"
G61MPV−36C−090
G61MPV−60C−090
G61MPV−60C−091
Page 51
2−1/2",
3", OR
TRANSITION
2"
2−1/2",
3", OR
4"
TRANSITION
2"***
2"*
G61MPV−110 with
2−1/2", 3", OR 4"
vent pipe

Intake Piping

The G61MPV furnace may be installed in either direct vent
or non−direct vent applications. In non−direct vent applica-
tions, when intake air will be drawn into the furnace from the
surrounding space, the indoor air quality must be consid-
ered and guidelines listed in Combustion, Dilution and Ven-
tilation Air section must be followed.
The G61MPV 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 out-
doors and flue gases are discharged outdoors. The pro-
vided air intake screen must not be used in direct vent ap-
plications.
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 provided in the
slip connector to assist in locating and starting the fasten-
er.
3 − Glue the provided 2" plug into the unused air intake con-
nector on the opposite side of the cabinet.
4 − Route piping to outside of structure. Continue with instal-
lation following instructions given in general guide lines for
piping terminations and in intake and exhaust piping ter-
minations for direct vent sections. Refer to figure 24 for
pipe sizes.
4"
G61MPV−045, 070, 071
090 or 091 with 2−1/2",
3", or 4" vent pipe
2"
2"
4"
TRANSITION
(use only if 4"
pipe is required)
3"
3"**
G61MPV−135 with
3" OR 4" vent pipe