Gas Supply and Piping, Gas Pressures | Sears 8MPN125J20B1 specs

Ventdampersonanyapplianceconnectedto the common vent

can cause condensation and corrosion in the venting system. Do not use vent dampers on appliances common vented with this fur- nace.

8. Gas Supply and Piping

Gas Piping Requirements

CARBON MONOXIDE POISONING, FIRE AND EXPLOSION HAZARD.

NOTE: The gas supply line must be installed by a qualifted service technician in accordance with all building codes.

NOTE: In the state of Massachusetts.

Failure to follow safety warnings exactly could result in serious injury, death, and/or property damage.

Models designated for Natural Gas are to be used with Natural Gas ONLY, unless properly converted to use with LP gas.

Gas Supply Requirements

•Use only the Type of gas approved for this furnace. See rating plate for approved gas type.

•Gas input must not exceed the rated input shown on the rating plate. Overfiring will result in failure of heat exchanger and cause dangerous operation.

Do not allow minimum supply pressure to vary downward. Do- ing so will decrease input to furnace. Refer to Table 3 for gas supply. Refer to Table 6 and Table 7 for manifold pressures.

I Gas Pressures

Gas Type	Supply	Pressure
	Recommended	Max.	Min,

Natural	7"	14"	4.5"
Propa ne	11"	14"	11"

Typical Gas Piping (N8MP)

a.Gas supply connections MUST be performed by a li- censed plumber or gas fitter).

b.When flexible connectors are used, the maximum length shall not exceed 36" (915 mm).

c.When lever handle type manual equipment shutoff valves are used, they shall be T-handle valves.

d.The use ofcopper tubing for gas piping is NOT approved.

1.Install gas piping in accordance with local codes, or in the ab- sence of local codes, the applicable national codes.

2.It is recommended that a manual equipment shutoff valve be installed in the gas supply line outside the furnace. Locate valve as close to the furnace as possible where it is readily ac- cessible. Refer to Figure 12.

FIRE HAZARD

Failure to follow safety warnings exactly could result in death or personal injury.

Use wrench to hold furnace gas control valve when turning elbows and gas line to prevent damage to the gas control valve and furnace.

Drip Leg and Union, Union*	should be outside the		Manual shut- off
cabinet. Manual shut- off valve MUST be upstream		of
dripleg, union, and furnace.			valve

Alterative

Use elbows and 3" pipenipple to connectvalveto piping when using right side gas pipe entry. _.

LP Low pressure	3'pipe
switch.

25-24-86

* Union may be installed inside the cabinet when necessary because of clearances.

3. Useblackironorsteelpipeandfittingsorotherpipeapproved	4. Use	pipe thread compound which is resistant to natural and
by local code.	LP	gases.

_]	441 01 261302

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