Single Stage Multi Position Furnace
Service Manual
28
440 08 2001 02
clamp
Rubber
Hose
Rubber
Hose
clamp
Rigid
Plastic
Drain
Tube
Rotate
downward
20
°
to 30
°
DRAIN SIDE VIEW
Figure 37
Upflow Installations (Single Pipe & Direct Vent N9MP1 & N9MP2(A1) Models)
Vent Pipe
Vent Pipe
Grommet
Vent Fitting
& Clamps
dwg 25--23--57
Supply Air
Combustion Blower
(Rotate 180
°°°°
for
Left Side)
Return
Air
RIGHT Side Venting
Drain Line
Pressure Switch,
Blower
Pressure Switch,
Transition
Rubber
Plug
Plastic
Caps
Condensate
Trap & Gasket
3
/
4
²²²²
Hose & Clamps
LEFT Side Venting
Supply Air
5
/
8
²²²²
Hose & Clamps
Return
Air
Ex
ha
us
t
Ex
ha
us
t
Plastic
Caps
Combustion
Blower
Mounting
Screws (4)
Transition Box
Pressure Switch
Hose, Transition
Pressure Hose,
Blower
Inle
t
Rigid Plastic
Drain Tube
Inle
t
Combustion
Air Pipe,
N9MP2 ONLY
Combustion
Air Pipe,
N9MP2 ONLY
Upflow Installations -
(Single Pipe & Direct Vent N9MP1 & N9MP2 Models) (See Figure 37)
Mount the condensate drain trap in a vertical position to either the
left or right 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 relocate 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 left side venting from the furnace. If right
side venting is required, the combustion blower must be relocated
on the plastic transition box. Remove the four(4) screws that secure
the blower to the transition. Rotate the blower 180
°
and secure with
the four(4) screws. Use caution to not over tighten the screws to pre-
vent stripping out of the plastic mounting holes.
Plug the upper drain stub of the vent fitting with the rubber plug. Use
a blunt pointed screwdriver to push the plug into the stub.
For left side mounted condensate trap, 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.
For right side mounted condensate trap,
the rigid plastic drain
tube MUST be used. Cut two 2
²
long sections from the
3
/
4
²
OD rub-
ber hose. Connect the plastic drain tube to the drain stub on the bot-
tom of the plastic transition box and to the stub on the condensate
trap using the two hose sections and
3
/
4
²
clamps.
NOTE:
The support leg on the plastic drain tube MUST be posi-
tioned on the blower partition.
Connect the
5
/
8
²
OD rubber hose with the 90
°
bend to the lower
drain stub on the vent fitting and secure with a
5
/
8
²
clamp.
Route the hose to the smaller 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
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.
