Nordyne M3RL Series installation instructions Closet or Alcove, Ducted Return Air

	REDUCER
FELT-SEAL(1)	C

SPACERS

(1)FINGER TAB DUCT CONNECTOR ONLY

(2)SCREW DOWN DUCT CONNECTOR ONLY

( )OPENING TO DUCT

(1)WITH PLATE (C) REMOVED OPENING BECOMES 13-1/4” x 13-1/4”

(2)WITH PLATE (C) REMOVED OPENING BECOMES

13" X 13". WITH REDUCER IT IS 13" X 10-1/8".

XSEE TABLE 5

Figure 5.

WALL

SIDE

ALT. FUEL

LINE HOLES

C

L

FUEL LINE

HOLE

REAR WALL

10"

C

L

FLOOR

OPENING

23 -1/4"

Figure 6. Closet or Alcove

i.Gas piping is not run in or through the return duct system.

j.Test the negative pressure in the closet with the air-circulating fan operating at high speed and the closet closed. The negative pressure is to be no more negative than minus 0.05 inch water column.

k.For floor return systems, the manufactured home manufacturer shall affix a prominent marking on or near the appliance where it can be easily read when the closet door is open. The marking shall read:

!CAUTION:

HAZARD OF ASPHYXIATION: Do not cover or restrict return air opening.

l.Air conditioning systems may require more duct register and open louver area to ob-

tain necessary airflow. Use NORDYNE’s certiduct program to determine proper duct size for A/C.

DUCTED RETURN AIR

M3 furnaces with model numbers ending in AW or BW are factory configured for the return air to flow through the front louvered door. The return air may also be attached to either side or the top of the furnace cabinet using a field installed kit. Refer to Table 12 for the NORDYNE ducted return kit P/N number. The location and size of the side and top return air connections are shown in Figure 1. The filter size for the side return air is 20” x 20” x 1”. For top return the filter size is 24” x 16” x 1”.

M3 furnaces with model numbers ending in BWT are factory configured for the return air to enter the top of the furnace.

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