Downflow Installations (Single Pipe & Direct Vent NBMP1 & NBMP2 Models)
Vent Fitting
& Clamps
5/8" Hose &
Plastic Caps
Trap & Gasket
Drain Line
LEFT Side Venting RIGHT Side Venting
<z> <Z>
Return Air
Return Air
Combustion Blower
Mounting Screws (4)
Hose & Clamps
Supply Air
Pressure Switch
Hose, Transition
Plastic
Transition Box
Pressure
Switch, Blowe_rr
Pressure Switch
Hose, Blower
Combustion Blower
(Rotate 180° for Left Side)
Pressure
Switch,
Transition
Supply Air
dwg
Vent Pipe
Grommet
Combustion
NBMP2 ONLY
DRAIN SIDE VIEW
Rotate
downward
20 ° to 30°
D0wnfl0wInstallations- (Single Pipe& Direct
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 fur-
nace side panel and relocated to the open set of holes in the oppo-
site side panel. Drill two 7/64" diameter holes in the casing using
the condensate 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. Ifthe
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.
VentN9MP1& N9MP2 Models)(See Figure 15)
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 pressure 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" 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" 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" clamp.
Connect the 5/8" OD rubber hose with the 90 ° bend to the lower
stub on the vent fitting and secure with a 3/4" 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" clamp.
NOTE: Ensure hoses maintain a downward slope to the conden-
sate trap with no kinking or binding for proper condensate drain-
age.
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