Single Stage Multi Position Furnace
Service Manual
27
440 08 2001 02
Plastic
Caps
Figure 36
Downflow Installations (Dual Certified *9MPD(A1) Models)
Vent Pipe
Vent Pipe
Grommet
Vent Fitting
& Clamps
Combustion
Air Pipe, (Optional)
dwg 25--23--56
Supply Air
Ex
ha
us
t
Inle
t
Air Intake
Coupling
Combustion Blower
(Rotate 180
°°°°
for Left Side)
RIGHT Side Venting
Drain Line
Plastic
Caps
Pressure Switch,
Transition
Pressure Switch
Hose, Transition
Rubber
Plug
5
/
8
²²²²
Hose &
Clamps
Condensate
Trap & Gasket
3
/
4
²²²²
Hose
& Clamps
Return Air
LEFT Side Venting
Ex
ha
us
t
Supply Air
Inle
t
Combustion Blower
Mounting Screws (4)
Transition
Box
Gas Pipe
Grommet
Return Air
Pressure Switch
Hose, Blower
Pressure Switch,
Blower
DRAIN SIDE VIEW
Rotate downward
20
°
to 30
°
Downflow Installations - (Dual Certified *9MPD Models
)
(See Figure 36)
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.
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 to the transition. Rotate the blower 180
°
and se-
cure with the four(4) screws. Use caution to not over tighten the
screws to prevent stripping out of the plastic mounting holes.
For right side venting, remove vent fitting assembly from combus-
tion blower. Remove 90
°
elbow and rubber tubing from the vent fit-
ting by loosening the clamp on the vent fitting. Securely attach vent
fitting to combustion blower.
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.
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.
Remove the pressure switch hose from the upper stub on the plastic
transition box.
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 stub on the plastic tran-
sition box. Cut off excess hose and discard. Connect the pressure
switch hose to the lower stub on the plastic transition box.
NOTE:
Failure to correctly install the pressure switch hose to the transition
box 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 left drain
stub on the vent fitting and secure with a
5
/
8
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.
