Nordyne SERIES M1B Manuel D’Utilisation

8

Location, size, and number of registers should 
be selected on the basis of best air distribution 
and fl oor plan of the home. The supply air must 
be delivered to the heated space by duct(s) 
secured to the furnace casing, running full 
size and without interruption.

Three typical distribution systems are shown 
in Figure 5. The location, size, and number of 
registers should be selected on the basis of 
best air distribution and fl oor plan of the home.

NOTE:  These Installation procedures are 
suggested for typical furnace installations. 
Since all installations are different from each 
other, the sequence of instructions may differ 
from the actual installation. Only qualifi ed HVAC 
technicians should install this furnace.

General Information
•  The furnace must be leveled at installation and 

attached to a properly installed duct system. Do 
not use the back of the furnace for return 
air. See page 7 for circulating requirements.

• The furnace must be installed so that all 

electrical components are protected from 
water.

•  The dimensions of the room or alcove must be 

able to accommodate the overall size of the 
furnace and the installation clearances listed 
in Table 1 and Figure 3 (page 6)

•  The furnace must be installed upstream from 

a refrigeration system.

•  The plenum attached to the A/C coil box and 

ductwork within 3 ft. of the furnace must be 
installed so that surfaces are at least 1/4” from 
combustible construction.

•  The cabinet plug must always be used to close 

the hole in the side of the furnace when rotating 
the inducer.

•  M1/M5 models must be installed with the Nordyne 

A/C coil box which are listed according to the 
cabinet size of the furnace: “B” cabinet - 920169, 
“C” cabinet - 920171, and “D” cabinet - 920172.

•  The M1 Series gas and M5 Series oil furnace 

is certifi ed for use on wood fl ooring or supports, 
but must be installed on top of a duct connector. 
This factory supplied accessory must be 
installed in the fl oor cavity and attached to the 
supply air duct before the furnace is installed. 

Requirements and Codes
Installer must be familiar with and comply with 
all codes and regulations applicable to the 
installation of these heating appliances and 
related equipment. In the absence of local codes, 
the installation must be in accordance with the 
current provisions of one or more of the following 
standards.

•  Federal Manufactured Home Constructions 

& Safety Standard (H.U.D. Title 24, Part 
3280.707[a][2])

• American National Standard (ANSI-119.2/

NFPA-501C) for all recreational vehicle 
installations.

•  American National Standard (ANSI-Z223.1/

NFPA-54) and/or CAN/CSA B149 for all gas-
fi red furnace models.

• American National Standard (ANSI-Z95.1/

NFPA-31) and/or CSA B139 for all oil-fi red 
furnace models.

•  American National Standard (ANSI-C1/NFPA-

70) and/or CSA 22.1 Canadian Electric Code 
Part 1 for all electrical fi eld wiring.

•  Units have been researched under standards 

UL 307A & B, UL727-1999, ANSI Z21.47b/
CSA 2.3b-2008, and CSA B140.10.

Locating and Cutting Duct Openings
Floor cut-outs and fuel line holes must be carefully 
located to avoid misalignment of the furnace, 
and vent piping. To locate standard ducts see 
Figure 6 (page 9). For round ducts, see Figure 7.
1. Measure 10” from the rear wall or alcove and 

mark the centerline of the cut-out on the fl oor. 

2. Using the centerline as a starting point, draw 

the rest of the duct cut-out to the dimensions 
shown in Figures 6 or 7.

3. Cut out the fl oor opening 1/16” larger than 

the actual cutout drawn. This will allow some 
clearance when installing the duct connector.

4. Measure from the top of the fl oor down to the 

top of the supply air duct to obtain the depth of 
the fl oor cavity. NOTE: The depth of the fl oor 
cavity shown as “X” in Figure 9 (page 9) will 
determine the correct duct connector.

5. Determine which duct connector to use from 

Table 3 (page 9).

6.  Measure and drill gas hole. and cut out for cooling 

coil (if applicable). See Figures 6 or 7 (page 9).