Nordyne M4RC-072D-35C, Installation Instructions Manual

19

Upflow Furnace Installation

 WARNING:

The furnace must not be installed directly on 

carpeting, tile, or any combustible material other 

than wood flooring.

The *RC series gas furnace is certified for use on wood 
flooring or supports. The upflow furnace is shipped with 
the bottom panel (

Figure 41 (page 37)

) installed and 

must be removed from the bottom of the cabinet before 
positioning and installing the furnace. See Bottom Removal 
section for removal instructions.

NOTE: These Installation procedures are suggested for 
typical furnace installations. Since all installations are 
different from each other, the sequence of these steps 
may differ from the actual installation.

1. Position the furnace on top of the return air ductwork 

or return air stand ensuring even alignment of furnace 
air opening and return air duct. NOTE: The ductwork or 
stand must have an opening equal to that of the return 
air opening of the furnace. See the cabinet dimensions 
in 

Figure 41

 for the proper return air opening size.

2. Secure the furnace to the floor or base. Check for level 

from front to back and side to side. NOTE: Additional 
fasteners may be used at rear, sides or through door 
frame, as desired, to secure furnace to closet or alcove 
framing.

3. Secure the return air ductwork to the bottom of the 

furnace with self drilling screws.

4. Position the A/C coil box on the top of the furnace and 

secure in place using the provided attachment brackets. 
To install the brackets: position one bracket on side of 
furnace and using the provided self-drilling screws, 
secure the bracket to the A/C coil box and the furnace. 
Repeat for other side of furnace.

5. Position the plenum on top of the coil box and secure 

together with sheet metal screws. The screws must 
penetrate the sheet metal casing and coil box flange.

6. Secure the supply air ductwork to the plenum. Tape or 

seal all seams if required by local code.

Bottom Panel Removal

The steps listed below describe how to remove the bottom 

panel from the furnace. 

Figure 22

.

1. Remove the door (1) from the blower compartment.
2. Disconnect the blower motor wiring harness (2) from 

the control board.

3. Remove two screws (3) securing the blower assembly 

(4) to the furnace.

4. Carefully pull the blower assembly (4) out thru the front 

of the furnace.

5. Remove all screws (5) securing bottom panel (6) to 

bottom of furnace and front brace (7).

6.  Lift up and slide bottom panel (6) out through front of 

furnace.

7. Reinstall the blower assembly (4) in reverse order.

Figure 22

6

7

5

1

2

3

4

Figure 22. 

Bottom Panel Removal

Alternate Bottom Panel Removal

If the bottom panel cannot be removed using the previous 

instructions, the steps below are an alternate method for 
removing the bottom panel. See 

Figure 23 (page 20)

.

1. Remove the door (1) from the blower compartment .
2. Remove all screws securing the bottom panel (2) to the 

front brace (3).

3. Remove two screws (4) securing the furnace cabinet 

to the blower deck (5).

4. Remove all screws (6) securing the furnace cabinet to 

the bottom panel (2).

5. Remove the screw (7) securing the bottom corner of the 

furnace cabinet to the front brace (3).

6. Carefully spread the bottom corner of the furnace cabinet 

outwards while sliding the bottom panel (2) out through 
the front of the furnace.

7. Reassemble the furnace in reverse order.