INSTALLATION INSTRUCTIONS - Lennox
INSTALLATION INSTRUCTIONS - Lennox
INSTALLATION INSTRUCTIONS - Lennox
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TYPICAL AIR INTAKE PIPE CONNECTIONS<br />
UPFLOW DIRECT VENT APPLICATIONS<br />
(Right−Hand Exit Shown)<br />
2−1/2",<br />
3" OR<br />
4<br />
2<br />
TRANSITION<br />
2*<br />
TRANSITION<br />
2−1/2",<br />
3" OR<br />
4<br />
2<br />
2<br />
*2<br />
2<br />
*2"<br />
PLUG<br />
(Must be<br />
glued in<br />
place)<br />
−24B−045<br />
−24B−070<br />
−36B−070<br />
−36C−090<br />
−36C−090H<br />
−48C−090<br />
−48C−110<br />
48C−110H<br />
−60C−110<br />
−24B−045<br />
−24B−070<br />
−36B−070<br />
−36C−090<br />
−36C−090H<br />
−48C−090<br />
−48C−110*<br />
−48C−110H*<br />
−60C−110*<br />
−24B−045<br />
−24B−070<br />
−36B−070<br />
−36C−090<br />
−36C−090H<br />
−48C−090<br />
−48C−110<br />
−48C−110H<br />
−60C−110<br />
−60D−135*<br />
*Pipe length must be limited<br />
to 4" in −135 applications.<br />
FIGURE 16<br />
Intake Piping<br />
The G43UF furnace may be installed in either direct vent<br />
or non−direct vent applications. In non−direct vent applications,<br />
when intake air will be drawn into the furnace<br />
from the surrounding space, the indoor air quality must be<br />
considered and guidelines listed in Combustion, Dilution<br />
and Ventilation Air section must be followed.<br />
The G43UF unit is designed for either left−side or right−side<br />
air intake connections. Intake air piping is independent of<br />
exhaust piping.<br />
Follow the next four steps when installing the unit in Direct<br />
Vent applications, where combustion air is taken from<br />
outdoors and flue gases are discharged outdoors. The<br />
provided air intake screen must not be used in direct<br />
vent applications.<br />
1 − Use transition solvent cement to connect PVC pipe to<br />
the ABS slip connector located on the side of the burner<br />
box.<br />
2 − Use a sheet metal screw to secure the intake pipe to<br />
the connector, if desired. A pilot indentation is provided<br />
in the slip connector to assist in locating and<br />
starting the fastener.<br />
3 − Glue the provided 2" ABS plug into the unused ABS air<br />
intake connector on the opposite side of the cabinet with<br />
ABS all pupose cement.<br />
4 − Route piping to outside of structure. Continue with<br />
installation following instructions given in general<br />
guide lines for piping terminations and in intake and<br />
exhaust piping terminations for direct vent sections.<br />
Refer to figure 16 for pipe sizes.<br />
TYPICAL AIR INTAKE PIPE CONNECTIONS<br />
UPFLOW NON−DIRECT<br />
VENT APPLICATIONS<br />
(Right−Hand Exit Shown)<br />
PLUG<br />
(Must be<br />
glued in<br />
place)<br />
FIGURE 17<br />
6 in. Max.<br />
INTAKE<br />
DEBRIS<br />
SCREEN<br />
(Provided)<br />
NOTE − Debris screen and elbow may be rotated, so that<br />
screen may be positioned to face forward, backward or<br />
downward.<br />
Page 17
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