Single Stage Multi Position Furnace
Service
Manual
41
440 08 2001 02
Horizontal Right Installations (Single Pipe & Direct Vent N9MP1 & N9MP2--A2 Models)
Vent Pipe
Vent Pipe
Grommet
Vent Fitting
&Clamps
dwg 25--23--59a
Combustion Blower
Return
Air
Drain Line
Pressure
Switch, Transition
Pressure Switch
Hose, Transition
Yellow
Plastic
Cap
Plastic
Caps
Condensate
Trap & Gasket
3
/
4
²
²²
² Hose
&Clamps
Supply
Air
5
/
8
²
²²
² Hose &
Clamps
Exhaust
Plastic
Caps
Transition Box
Combustion Blower
Mounting Screws (4)
Pressure
Switch, Blower
Pressure Switch
Hose, Blower
Combustion
Air Pipe,
N9MP2 ONLY
Inlet
Some Models
have one
pressure switch
Figure 49
Horizontal Trap Connection
Preassemble
and insert
into furnace
“Clamp ears”
Pointed OUT
NOTE: TRAP MUST BE PRIMED BEFORE OPERATION
Horizontal Right Installations - (Single Pipe & Direct Vent N9MP1 & N9MP2 Models) (See Figure 49)
Note: For easier installation of the drain hoses and clamps to the
condensate trap, follow the directions outlined below except do not
make any clamp connections to any of the drain stubs and hoses
until the hose routing and lengths have been determined. Remove
the condensate trap and drain hoses from the furnace and secure
the drain hoses to the drain stubs on the trap with the hose clamps
(position the clamps as shown in Figure 49). Install the condensate
trap/hose assembly to the furnace casing. Hook one side of the
“clamp ears” on the drain stub through the hole in the casing and
push the condensate trap into position. Secure with the two screws.
Reconnect the drain hoses to the stubs on the vent fitting and the
plastic transition and secure with the clamps.
Relocate the plastic caps and clamps on the condensate drain trap
from the vertical drain stub to the horizontal drain stubs. Secure the
clamps tightly to prevent condensate leakage.
Mount the condensate drain trap in a vertical position to the right
side of the furnace using the two screws and gasket that are pro-
vided. Note: The condensate trap will be located under the furnace
in a vertical position when the furnace is placed horizontally on the
right side. If needed, remove the hole plugs from the furnace side
panel and relocate to the open set of holes in the opposite side pan-
el.
NOTE: All gaskets and seals must be in place for sealed combus-
tion applications.
Ensure that the vent fitting is securely attached to the combustion
blower using the clamps.
NOTE: The vent fitting MUST be installed with the airflow marking
arrow pointed toward the vent pipe.
Plug the left drain stub on the v ent fitting with the yellow plastic cap.
Remove the pressure switch hose from the upper stub on theplastic
transition box.
Relocate the plastic caps on the stubs of the plastic transition 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. Ensure
that the hose is routed above the stub on the transition box so that
condensate does not collect in the hose. NOTE: Failure to correctly
install the pressure switch hose to the transitioncan adversely affect
the safety control operation.
Connect the
3
/
4
² OD rubber hose with the 90° bend to the large drain
stub on the condensate trap and secure with a
3
/
4
² clamp.
Route the hose to the drain stub on the bottom of the plastic transi-
tion box. Cut off excess hose and discard. Connect the hose to the
drain stub on the transition and secure with a
3
/
4
² clamp.
Connect the
5
/
8
² OD rubber hose with the 90° bend to the right stub
on the vent fitting and secure with a
5
/
8
² clamp.
Route the hose to the smallerdrain 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.
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