Single Stage Multi Position Furnace
Service Manual
31
440 08 2001 02
Figure 40
Downflow Installations (Single Pipe & Direct Vent N9MP1 & N9MP2(A1) Models)
Vent Pipe
Vent Pipe
Grommet
Vent Fitting
& Clamps
dwg 25--23--60
Return Air
Drain Line
Pressure
Switch,
Transition
Pressure Switch
Hose, Transition
Rubber
Plug
Plastic
Caps
Condensate
Trap & Gasket
3
/
4
²²²²
Hose & Clamps
Supply Air
5
/
8
²²²²
Hose &
Clamps
Ex
ha
us
t
Plastic Caps
Ex
ha
us
t
Return Air
RIGHT Side Venting
LEFT Side Venting
Combustion Blower
(Rotate 180
°°°°
for Left Side)
Supply Air
Transition Box
Pressure Switch
Hose, Blower
Pressure
Switch, Blower
DRAIN SIDE VIEW
Rotate
downward
20
°
to 30
°
Inle
t
Inle
t
Combustion
Air Pipe,
N9MP2 ONLY
Combustion Blower
Mounting Screws (4)
Downflow Installations - (Single Pipe & Direct Vent N9MP1 & N9MP2 Models)
(See Figure 40)
Mount the condensate drain trap in a vertical position to either the
right or left side of the furnace using the two screws and gasket that
are provided. If needed, remove the hole plugs from the furnace
side panel and relocated to the open set of holes in the opposite side
panel. Drill two
7
/
64
²
diameter holes in the casing using the conden-
sate trap as the template.
Ensure that the vent fitting and the 90
°
elbow is securely attached to
the combustion blower using the rubber coupling and clamps.
NOTE:
The vent fitting
MUST
be installed with the airflow marking
arrow pointed toward the vent pipe, with the drain stub at a 20
°
to 30
°
downward slope.
This configuration allows right side venting from the furnace. If the
left side venting is required, the combustion blower must be relo-
cated on the plastic transition box. Remove the four(4) screws that
secure the blower transition box. Rotate the blower 180
°
and secure
with the four(4) screws. Use caution to not over tighten the screws to
prevent stripping out of the plastic mounting holes.
Plug the upper drain stub on the vent fitting with the rubber plug. Use
a blunt pointed screwdriver to push the plug into the stub.
Remove the pressure switch hose from the upper stub on the plastic
transition.
Relocate the plastic caps on the stubs of the plastic transition box
from the lower stubs to the upper stubs and secure tightly with the
clamps.
Route the pressure switch hose to the lower drain stub on the plastic
transition box. Cut off excess hose and discard. Connect the pres-
sure switch hose to the lower stub on the plastic transition box.
NOTE:
Failure to correctly install the pressure switch hose to the
transition can adversely affect the safety control operation.
Connect the
3
/
4
²
OD rubber hose with the 90
°
bend to the drain stub
on the bottom of the plastic transition box and secure with a
3
/
4
²
clamp.
Route the hose to the large drain stub on the condensate trap. Cut
off excess hose and discard. Connect the hose to the drain stub on
the trap and secure with a
3
/
4
²
clamp.
Connect the
5
/
8
²
OD rubber hose with the 90
°
bend to the lower stub
on the vent fitting and secure with a
3
/
4
²
clamp.
Route the hose to the smaller stub on the condensate trap. Cut off
excess hose and discard. Connect the hose to the drain stub on the
trap and secure with a
5
/
8
²
clamp.
NOTE:
Ensure hoses maintain a downward slope to the conden-
sate trap with no kinking or binding for proper condensate drainage.
