Fire Or Explosion Hazard; Gas Piping - Kenmore N8MSL0701412A1 Installation Instructions Manual

Upflow and Horizontal Furnaces
Connect supply-air duct to flanges on furnace supply-air
outlet. Bend flange upward to 90 ° with wide duct pliers. (See
Figure 14) The supply-air duct must be connected to ONLY
the furnace supply-outlet-air duct flanges or air conditioning
coil casing (when used). DO NOT cut main furnace casing
side to attach supply air duct, humidifier, or other accessories.
All accessories MUST be connected to duct external to
furnace main casing.
NOTE: For horizontal applications, the top-most flange may
be bent past 90 ° to allow the evaporator coil to hang on the
flange temporarily while the remaining attachment and
sealing of the coil are performed.
Downflow Furnaces
Connect supply-air duct to supply-air outlet on furnace. Bend
flange inward past 90 ° with wide duct pliers. (See Figure 14)
The supply-air duct must be connected to ONLY the furnace
supply-outlet or air conditioning coil casing (when used).
When installed on combustible material, supply-air duct must
be connected to ONLY the accessory subbase or a factory
approved air conditioning coil casing. DO NOT cut main
furnace casing to attach supply side air duct, humidifier, or
other accessories. All accessories MUST be connected to
duct external to furnace casing.
FIRE HAZARD
A failure to follow this warning could result in
personal injury, or death and/or property damage.
Never connect return-air ducts to the back of the
furnace. Follow instructions below.
Return Air Connections
Downflow Furnaces
The return-air duct must be connected to return-air opening
(bottom inlet) as shown in Figure 19. DO NOT cut into casing
sides (left or right). Side opening is permitted for only upflow
and most horizontal furnaces. (See Figure 19) Bypass
humidifier connections should be made at ductwork or coil
casing sides exterior to furnace.
Upflow and Horizontal Furnaces
The return-air duct must be connected to bottom, sides (left
or right), or a combination of bottom and side(s) of main
furnace casing as shown in Figure 18 and Figure 20. Bypass
humidifier may be attached into unused return air side of the
furnace casing. (See Figure 18 and Figure 20)
Not all horizontal furnaces are approved for side return air
connections. (See Figure 20)
GAS PIPING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Never purge a gas line into a combustion chamber.
Never test for gas leaks with an open flame. Use a
commercially available soap solution made
specifically for the detection of leaks to check all
connections.
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Use proper length of pipe to avoid stress on gas
control manifold and a gas leak.
Gas piping must be installed in accordance with national and
local codes. Refer to current edition of NFGC.
Installations must be made in accordance with all authorities
having jurisdiction. If possible, the gas supply line should be a
separate line running directly from meter to furnace.
NOTE: In the state of Massachusetts:
1. Gas supply connections MUST be performed by a li-
censed plumber or gas fitter.
2. When flexible connectors are used, the maximum
length shall not exceed 36 inches (915 mm).
3. When lever handle type manual equipment shutoff
valves are used, they shall be T-handle valves.
4. The use of copper tubing for gas piping is NOT ap-
proved by the state of Massachusetts.
Refer to Table 6 for recommended gas pipe sizing. Risers
must be used to connect to furnace and to meter. Support all
gas piping with appropriate straps, hangers, etc. Use a
minimum of 1 hanger every 6 ft. (1.8 M) Joint compound (pipe
dope) should be applied sparingly and only to male threads of
joints. Pipe dope must be resistant to the action of propane
gas.
NOMINAL
IRON PIPE
SIZE
IN. (MM)
1/2 (12,7)
3/4 (19.0)
1 (25.4)
1-1/4 (31.8)
1-1/2 (38.1)
Table 6--Maximum Capacity of Pipe
INTERNAL LENGTH OF PIPE - FT (M)
DIA.
'N. (MM) 110/ 1620 / 1930/ 11401/ 115502/
0.622 (158) 175 120 97 82 73
0.824 (20.9) 360 250 200 170 151
1.049 (26.6) 680 465 375 320 285
1.380 (35.0) 1400 950 770 660 580
1.610 (40.9) 2100 1460 1180 990 900
* Cubic ft. of natural gas per hr for gas pressures of 0.5 psig (14-in. w.c,) or
less and a pressure drop of 0.5-in. w,c. (based on a 0.60 specific gravity
gas). Ref: Table 6 and ANSI Z223-2009/NFPA 54-2009.
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
If local codes allow the use of a flexible gas appliance
connector, always use a new listed connector. Do not
use a connector which has previously served another
gas appliance. Black iron pipe shall be installed at the
furnace gas control valve and extend a minimum of 2
in. (51 mm) outside the furnace.
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