a. Federal Manufactured Home Constructions
& Safety Standard (H.U.D. Title 24, Part 3280.707[a][2])
b.American National Standard
c.American National Standard
d.American National Standard
e.American National Standard
f.Units have been investigated under stan- dards UL 307A & B,
5.UNIT LOCATION
The furnace shall be appropriately located to the supply and return air distribution system. (See “AIR DISTRIBUTION”, Page 8) Sides and back of the furnace may be enclosed by wall framing. (See “Minimum Clearances,” Table 4, and Figures 2 through 5.)
The furnace installation is only intended for free air return through the furnace door louvers. DO NOT connect a ducted return air system di- rectly to the furnace. Improper installation may create a hazard and damage equipment, as well as void all warranties.
Furnace may be installed on combustible floor- ing when using NORDYNE Duct Connectors (see Section 10).
When installed in a residential garage, the fur- nace must be positioned so the burners and the source of the ignition are located no less than 18 inches above the floor and protected from physical damage by vehicles.
ALL MODELS | CLOSET | ALCOVE |
Front | 6" | 18" |
Back | 0" | 0" |
Sides | 0" | 0" |
Roof Jack | 0" | 0" |
Top | 6" | 6" |
Top and Sides of Duct | 0" | 0" |
Bottom of Duct |
|
|
B Cabinet | 0" | 0" |
A Cabinet (w/ coil box) | 0" | 0" |
A Cabinet (w/o coil box) | 1/4" | 1/4" |
Table 4. Minimum Clearances
6.MINIMUM CLEARANCES
This heating appliance must be installed with clearances not less than the minimums shown in Table 4. This heating appliance must be installed with ample clearance for easy access to the air filter, blower assembly, burner assem- bly, controls, and vent connections.
a. Alcove installations (see Figure 2): minimum 18" clearance at front of furnace shall be provided for future servicing. A removable access panel should be installed between top of the furnace door frame and the ceiling.
b.Closet installations must use a louvered door having a minimum free area of 235 sq. in. when located 6" from furnace (See Figure 3) or 390 sq. in. for 5 ton ready M1 furnaces. For special clearance between 1" and 6", re- quirements are a louvered door with a mini- mum of 250 sq. in. free area, with the open- ings in the closet door in line with the louvered openings in the furnace door . A fully louvered closet door may be used (See Figure 4 and section 7.i. to evaluate compliance with this requirement).
7.RETURN AIR PROVISIONS
U.S.A. home manufacturers shall comply with all of the following conditions to have acceptable return air systems for closet installed forced air heating appliances:
!CAUTION:
HAZARD OF ASPHYXIATION: Nega- tive pressure inside the closet, with closet door closed and the furnace blower operating on high speed, shall be no more negative than minus 0.05 inch water column.
A Single trunk duct | |
B | Dual trunk duct |
w/crossover connector | |
| Transition duct |
C | w/branches |
| |
Figure 5. Non-Platinum
Supply Duct System
6
