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6. Remove 7/8-in. diameter accessory hole knock-outs in blower compartment from mating sides of furnaces. (See Fig. 3.)
7. Insert a plastic snap bushing through the 7/8” knock-out from the outside of the casing.
8. Bend or remove the supply flanges as required for upflow or downflow installation. Refer to the furnace installation instructions for
complete details.
9. Position furnaces against each other on return air plenum, supply air plenum or evaporator coil casing. Adjust and shim each furnace to align
7/8-in. diameter holes in both furnaces.
10. Drill two 1/8-in. holes, approximately 1 in. below discharge flange, from inside top of discharge opening and through both furnaces. (See
Fig. 6.)
Drill two 1/8-in. holes, approximately 1 in. below return air flange, from inside top of return air opening and through both furnaces. (See
Fig. 7. as an example)
11. Drive 1 factory-supplied screw through each hole and tighten until furnaces are secure and foam strips have sealed gap between furnaces.
12. Connect return- and supply-air ducts to furnaces. Seal duct connections to prevent air leakage.
13. Move 115-v junction box JB in RH furnace (as viewed from the upflow position) from left-hand side to right-hand side. Refer to furnace
installation instructions for complete details.
Fig. 4—Removing Bottom Closure Panel
A02098
Fig. 5—Location of Foam Strips
A02254
FOAM
STRIPS
FOR BACK-TO-BACK
APPLICATIONS, APPLY
FOAM STRIPS AT THIS
HEIGHT, ALONG BACK
OF FURNACE
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