Haier GE NF96UV Service Manual page 22

TYPICAL EXHAUST PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON-DIRECT VENT
DO NOT transition
from smaller to larger
pipe in horizontal runs
of exhaust pipe.
Figure 16. Typical Exhaust Pipe Connections in Horizontal Direct or Non-Direct Vent Applications
Intake Piping
The NF96UV 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 and guidelines listed in Combustion, Dilution
and Ventilation Air section must be followed.
Use the following 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 transition solvent 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
guidelines for piping terminations and intake and
exhaust piping terminations for direct vent sections.
Refer to Table 10A through Table 10B for pipe sizes.
Use the following steps when installing the unit in Non-
Direct Vent applications where combustion air is taken
from indoors or ventilated attic or crawlspace and flue
gases are discharged outdoors.
APPLICATIONS (RIGHT-HAND DISCHARGE SHOWN)
12" max.
2"
or
2"
2"
EXHAUST
DO NOT transition
from larger to smaller
pipe in horizontal runs
of exhaust pipe.
* When transitioning up in pipe size, use the shortest length of 2" PVC pipe possible.
NOTE: Exhaust pipe and intake pipe must be the same diameter.
(Right Hand Discharge Shown)
2"
3"
TRANSITION
2"
*2"
*2"
EXHAUST
.
EXHAUST
1. Use field-provided materials and the factory-provided
air intake screen to route the intake piping as shown in
Figure 17 or Figure 18. Maintain a minimum clearance
of 3" (76mm) around the air intake opening. The air
intake opening (with the protective screen) should
always be directed forward or to either side in the
upflow position, and either straight out or downward in
the horizontal position.
The air intake piping must not terminate too close to
the flooring or a platform. Ensure that the intake air
inlet will not be obstructed by loose insulation or other
items that may clog the debris screen.
2. If intake air is drawn from a ventilated attic (Figure 19)
or ventilated crawlspace (Figure 20) the exhaust vent
length must not exceed those listed in Table 10C. If
3" diameter pipe is used, reduce to 2" diameter pipe
at the termination point to accommodate the debris
screen.
3. Use a sheet metal screw to secure the intake pipe to
the connector, if desired.
Page 22
NOTE: 1-1/2" Vent
Pipe Diameter Allowed
Only on 045/070 Units
1-1/2"
or
TRANSITION
2"
2"
EXHAUST
45° 45°
MAX MAX
SIDE VIEW
31-5000726 Rev. 0