Page 25
The G51MP 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 G51MP unit is designed for either left−side or right−side
air intake connections in either upflow or downflow applica-
tions. In horizontal applications, air intake must be brought
in through the top. Intake air piping is independent of ex-
haust 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 provided
air intake debris 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 installa-
tion 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 22 for
pipe sizes.
TYPICAL AIR INTAKE PIPE CONNECTIONS
UPFLOW OR DOWNFLOW DIRECT VENT APPLICATIONS
(Right−Hand Exit in Upflow Application Shown)
FIGURE 22
PLUG
(Must be
glued in
place)
G51MP−36B−045
G51MP−36B−070
G51MP−48C−090
G51MP−60C−090
G51MP−24B−045
G51MP−36B−045
G51MP−36B−070
G51MP−48C−090
G51MP−60C−090
G51MP−48C−110*
G51MP−60C−110*
G51MP−24B−045
G51MP−36B−045
G51MP−36B−070
G51MP−48C−090
G51MP−60C−090
G51MP−48C−110*
G51MP−60C−110*
G51MP−60D−135*
G51MP−36C−090 G51MP−36C−090 G51MP−36C−090
*Limit pipe length to 2"
in G51MP−110 and −135
applications.
G51MP−24B−045
2
2
2
2*
2
2*
2−1/2",
3" OR
4
TRANSITION
2"*
TRANSITION
2−1/2",
3" OR
4
G51MP−48C−110
G51MP−60C−110
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