66832-UIM-D-1205
Unitary Products Group
5
TO CONVERT FROM DOWNFLOW TO UPFLOW
CONFIGURATION (50-125 MBH Models)
1.
Lay the furnace on its back.
2.
Remove the front door.
3.
Remove the seven sheet metal screws that are used to fasten the
top cap to the casing. Remove the top cap and save the screws.
4.
Remove the four sheet metal screws that are used to fasten the
bottom cap to the casing. Remove the bottom cap and save the
screws.
5.
Unplug the vent blower wires.
6.
Disconnect the pressure hose from the vent blower.
7.
Remove the four machine screws that fasten the vent blower to
the vent pan and save the screws. Leave the gasket in place on
the pan.
8.
Remove the two extra machine screws in the vent pan front and
save the screws.
9.
Rotate the vent blower and transition 180° so that its outlet points
to the outlet air end of the furnaces as shown in Figure 1.
10. Line up the vent blower mounting holes with the holes in the vent
pan and screw it into place. Use the same machine screws that
held the vent blower in place previously.
11.
Install the two extra machine screws in the two open holes in the
front of the vent pan See Figure 1.
12. Plug in the vent motor wires.
13. Plug the pressure hose into the vent blower.
14. Remove the rectangular knockout in the center of the top cap. See
Figure 4.
15. Install the top cap at the same end of the furnace as the vent
blower, using the sheet metal screws saved earlier. See Figure 1.
16. Install the bottom cap on the bottom of the furnace using the sheet
metal screws saved earlier. See Figure 1.
17. The conversion is now complete. The furnace may now be
installed in the upflow position or in the horizontal position on
either side.
TO CONVERT FROM UPFLOW TO DOWNFLOW CON-
FIGURATION
(50-125 MBH Models)
1.
Lay the furnace on its back.
2.
Remove the front door.
3.
Remove the seven sheet metal screws that are used to fasten the
top cap to the casing.
4.
Remove the four sheet metal screws that are used to fasten the
bottom cap to the casing. Remove the bottom cap and save the
screws.
5.
Unplug the vent blower wires.
6.
Disconnect the pressure hose from the vent blower.
7.
Remove the four machine screws that fasten the vent blower to
the vent pan and save the screws. Leave the gasket in place on
the vent pan.
8.
Remove the two extra machine screws in the vent pan front and
save the screws.
9.
Install the cast aluminum transition on the vent blower, using the
three screws supplied on the vent blower. See Figure 3.
FIGURE 1: Upflow/Horizontal Configuration
GASKET
EXTRA
SCREWS
TOP
CAP
TRANSITION
PRESSURE
HOSE
PRESSURE
SWITCH
VENT
BLOWER
BOTTOM
CAP
VENT
PAN
FIGURE 2: Downflow/Horizontal Configuration
FIGURE 3: Vent Blower
GASKET
EXTRA
SCREWS
TOP
CAP
TRANSITION
PRESSURE
HOSE
VENT
BLOWER
VENT
PAN
BOTTOM
CAP
TRANSITION
