507271-02
Page 20 of 52
Issue 1621
Intake Piping
This furnace may be installed in either
direct vent
or
non-
direct vent
applications. In non-direct vent applications,
when intake air will be drawn into the furnace from the
surrounding space, the indoor air quality must be considered.
Guidelines listed in Combustion, Dilution and Ventilation Air
section must be followed.
Follow the next two steps when installing the unit in
Direct
Vent applications
, where combustion air is taken from
outdoors and flue gases are discharged outdoors.
The
provided air intake screen must not be used in direct
vent applications (outdoors).
1. Use cement or a sheet metal screw to secure the intake
pipe to the inlet air connector.
2. Route piping to outside of structure. Continue with
installation following instructions given in general guide
lines for piping terminations and intake and exhaust
piping terminations for direct vent sections. Refer to
Table 7 for pipe sizes.
Follow the next two steps when installing the unit in
Non-
Direct Vent applications
where combustion air is taken
from indoors and flue gases are discharged outdoors.
1. Use field-provided materials and the factory-provided
air intake screen to route the intake piping as shown in
Figure 27. Maintain a minimum clearance of 3” (76 mm)
around the air intake opening. The air intake opening
(with the protective screen) should always be directed
forward, or sideways.
2. If intake air is drawn from a ventilated attic (Figure 25)
or ventilated crawlspace (Figure 26) the exhaust vent
length must not exceed those listed in Table 8. If 3”
diameter pipe is used, reduce to 2” diameter pipe at the
ternmination point to accommodate the debris screen.
3. Use a sheet metal screw to secure the intake pipe to
the connector, if desired.
Typical Air
Intake
Pipe Connections
Non-Direct Vent Applications
Figure 24
Figure 26
Equipment in Confined Space
(Inlet Air from Ventilated Crawlspace & Outlet Air to Outside)
Figure 25
Equipment in Confined Space
(Inlet Air from Ventilated Attic and Outlet Air to Outside)
If this unit is being installed in an application with
combustion air coming in from a space serviced by an
exhaust fan, power exhaust fan, or other device which
may create a negative pressure in the space, take care
when sizing the inlet air opening. The inlet air opening
must be sized to accommodate the maximum volume
of exhausted air as well as the maximum volume of
combustion air required for all gas appliances serviced
by this space.
CAUTION
Summary of Contents for 92G1DF-P
Page 17: ...507271 02 Page 17 of 52 Issue 1621 A95DF 95G1DF and A93DF 92G1DF Table 7 ...
Page 18: ...507271 02 Page 18 of 52 Issue 1621 A95DF 95G1DF and A93DF 92G1DF Table 8 ...
Page 31: ...507271 02 Page 31 of 52 Issue 1621 Figure 49 Trap Drain Assembly Using 1 2 PVC or 3 4 PVC ...
Page 36: ...507271 02 Page 36 of 52 Issue 1621 Figure 56 Typical Wiring Diagram For A93DF 92G1DF ...
Page 37: ...507271 02 Page 37 of 52 Issue 1621 Typical Wiring Diagram Figure 57 For A95DF 95G1DF ...
Page 50: ...507271 02 Page 50 of 52 Issue 1621 Start Up Performance Check List ...
