Two- Stage Multi Position Furnace
Service Manual
28
440 08 2002 02
Figure 39
Upflow Installations (Dual Certified *9MPT & *9MPV(A1) Models)
Supply Air
Ex
ha
us
t
Inle
t
Return Air
Vent Pipe
Vent Pipe Grommet
Vent Fitting & Clamps
Rubber Plug
Drain Line
90
°°°°
Elbow
Plastic Caps
Rubber Cou-
pling
& Clamps
5
/
8
²²²²
Hose & Clamps
Combustion
Air Pipe (optional)
Air Intake Coupling
Combustion Blower
Pressure Switch Hose,
Transition
Pressure Switch,
Transition
(Lo Fire)
3
/
4
²²²²
Hose
& Clamps
Condensate
Trap & Gasket
(Left or Right Side)
Plastic Caps
Gas Pipe Grommet
Transition Box
Combustion
Blower
Mounting
Screws (4)
Pressure Switch
Hose, Blower
Pressure Switch,
Blower (Hi Fire)
AIR FLOW
25--23--53a
RIGHT Side Venting
LEFT Side Venting
clamp
Rubber
Hose
Rubber
Hose
clamp
Rigid
Plastic
Drain
Tube
25--23--53b
Inle
t
Ex
ha
us
t
Rigid Plastic
Drain Tube
Rotate
downward
20
°
to 30
°
DRAIN SIDE VIEW
Upflow Installations - (Dual Certified *9MPT & *9MPV
)
(See Figure 39)
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.
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.
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 directly 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 right 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 left drain
stub on the vent fitting and secure with a
5
/
8
²
clamp.
Route the hose to the small 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.