22
Hose #11
Hose #2
Figure 23
Upflow Model Installed Horizontally with
Right Side Down
Minimum 5 1/2” clearance is required for the drain trap
beneath the furnace.
1. Remove the clamps from both ends of the drain
hoses.
2. Remove the two screws holding the drain trap to the
blower deck.
3. Remove the trap and two hoses from the blower deck
4. Remove the two plugs from the right side of the
cabinet and install them in the blower deck.
5. (Draining the Vent Elbow ) Locate hose #2 (factory
installed) and cut 1” away from the 45 degree bend,
discard the 45 degree section. Insert hose #2 from
outside the cabinet through the cabinet drain hole
nearest the top, secure it to the barbed fitting in the
elbow with a red clamp.
6. For models *MSS920403AN and *MSS960403AN; locate
the hose #2 (factory installed) and cut 1.5 length
from the end of the hose. Insert hose #2 from outside
the cabinet through the cabinet’s drain hole nearest
to the top. Secure it to the barbed fitting in the elbow
with a red clamp.
7. (Draining the Collector Box) Install the non-grommet
end of hose #11 from outside the cabinet in the
bottom drain hole. Install on collector box and
secure with a silver clamp.
8. Use two silver clamps and secure the hoses to drain
trap. The trap outlet faces the front of the furnace.
Secure the trap to the cabinet using two screws
removed in step 2 by inserting the two screws through
the large set of holes in the top mounting tabs of the
trap into the two pre-drilled holes in the side of the
cabinet.
9. Refer to Field Supplied Drain section for instructions
on field supplied / installed drain on outlet of furnace
trap.
Upflow Model Installed Horizontally with
Left Side Down
Minimum 5 1/2” clearance is required for the drain trap
beneath the furnace.
*Also see Front Cover Pressure Switch Tube Location on
page 10.
1. Remove the clamps from the two drain tubes on the
trap.
2. Remove the two screws holding the drain trap to the
blower deck.
3. Remove the trap and hoses from the blower deck.
Hose #6
Hose #5
Hose #11
Figure 24
4. Remove the two plugs from the left side of the cabinet
and install them in the blower deck.
5. (Draining the Vent Elbow) Locate hose #6. Measuring
from the non-grommet end; cut off and discard 1 ½”
for a “D” width cabinet, 5” for a “C” width cabinet,
8 ½” for a “B” width cabinet.
6. Remove the rubber plug from vent – drain elbow side
port. Place hose #6 on the vent – drain elbow side port
and secure with a silver clamp .
7.
Unused vent-drain elbow drip leg port must be
sealed to prevent flue gases from escaping. Insert
the rubber plug removed in step 6 into the unused
elbow drain port. Inserting a blunt tool such as a
3/16’’ Allen wrench into the center of the rubber plug
will stretch the plug and allow complete insertion.
8. Locate hose #5 and cut 3” from the non-grommet end.
Discard the section without the grommet.
9. Insert the cut end of tube #5 through the lower cabinet
drain hole.
10. Connect hose #6 & hose #5 using 100º elbow and secure
with two red clamps
