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

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Figure 24
Figure 24.
Pressure Switch Tubing for Upflow
Furnaces (Models: *M4RC054, *M4RC072,
*M4RC090, & *M4RC108)
Figure 26
FACTORY INSTALLED
LOCATION
ALTERNATE
LOCATION
Figure 26.
Alternate Pressure Switch Location
Alternate Pressure Switch Location
In some inducer orientations, the inducer pressure switch
may interfere with gas pipe installation. Check the side
of the cabinet the gas pipe will enter and determine if the
inducer pressure switch needs to be moved. If the switch
interferes with gas pipe installation, please follow these
instructions for relocating it to the alternate location:
1. Shut off any electrical power to the furnace.
2. Label and disconnect the tubing and wires from the
pressure switch.
3. Remove two screws securing the pressure switch to
the inducer housing.
4. Remove the pressure switch from the mounts on the
inducer housing and relocate it to the other set of mounts
90° from previous location. See
Figure 26 .
5. Secure the pressure switch with two screws.
6. Reconnect the tubes and wires to the pressure switch.
Accessories
The components in Figure 27 , Figure 28 (page 22) ,
Figure 29 , & Figure 30 are included in the extra parts
bag that is supplied with the purchase of M4RC/M4RL
furnaces. Depending on your particular installation,
some of these components are optional and may not be
used. Please refer to the descriptions and accompanying
figures when installing these items.
Finish Flange
The finish flange must be installed to vent the combustion
air pipe through the top of the furnace. See
Figure 27 .
NOTE: For proper installation, it is important that the pipe
and screw holes in the finish flange, gasket, and cabinet
are aligned.
1. Position flange gasket and finish flange on top of the
furnace cabinet. Evenly align vent hole and screw holes
in gasket, flange, and cabinet.
2. Position finish flange on top of the flange gasket with
the FRONT lettering nearest to the front of the furnace.
3. Secure flange and gasket to cabinet with three field
supplied sheet metal screws.
Figure 25
Figure 25.
Pressure Switch Tubing for Downflow
Furnaces (Model: *M4RL090)
Figure 27
Figure 27.
Finish Flanges
Finish Flange
Flange Gasket
Hole for Flue
Vent Pipe Hole for Inlet
Air Vent Pipe
FRONT
FRONT lettering must be
located near front
of furnace