Lennox Hearth MPD35ST-NM manual Burn-in Period, Orifice Sizes Sea Level to High Altitude All Models

Manifold Gas Supply Pressure

(electronic models)

Fuel #	Fixed
Natural Gas	3.5" WC
	(.87 kPa)
Propane	10.0" WC
	(2.49 kPa)

Table 5

Test gauge connections are provided on the front of the millivolt gas control valve, identified IN for the inlet and OUT for the manifold side (see Figure 2 on Page 4 ). A 1/8" NPT Test gauge connection is provided at the inlet and outlet (manifold) ports on the electronic gas control valve (see Figure 3 on Page 5 ).

These appliances must be isolated from the gas supply piping system (by closing their individual manual shut-off valve) during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.5 kPa).

These appliances and their individual shut-off valves must be disconnected from the gas supply piping system during any pressure testing of that system at pressures greater than 1/2 psig (3.5 kPa).

Orifice Sizes - Sea Level to High Altitude (All Models)

These appliances are tested and approved for installations at elevations of 0-4500 feet (0-1372 meters) above sea level using the standard burner orifice sizes (marked with an "*" in Table 6 ). At the time of installation, it must be determined if the appliance needs to be derated. Contact your local gas supplier for deration requirements for your area.

Deration - At higher elevations, the amount of BTU fuel value delivered must be reduced by either using gas that has been derated by the gas company or by changing the burner orifice to a smaller size as regulated by the local authorities having jurisdiction and by the (USA) National Fuel Gas Code NFPA 54 / ANSI Z223.1 - latest edition or, in Canada, the CAN1-B149.1 and .2 codes - latest edition.

Burner Orifice Sizes (all models)

Elevation	Natural	Propane
	Gas	Gas
Feet (meters)
	drill size (inches)	drill size (inches)
0-4500	#37 (.104") *	1.55 mm (.061")*
(0-1372)	24M1001 •	42M7901 •

*Standard size installed at factory

• Part /Cat. Number

Table 6

Burn-in Period

During the first few fires of this appliance there will be some odor due to the curing of the paint and burning off of lubricants used in the manufacturing process.

Depending on your use, the burn-in period may take a few hours or a few days.

KEEP YOUR HOUSE WELL VENTILATED DURING THE CURING PROCESS. THE ODOR AND HAZE EMITTED DURING THE CURING PROCESS CAN BE QUITE NOTICEABLE AND MAY SET OFF A SMOKE DETECTOR.

If an optional blower is installed, Do not turn it on during the Burn-In period.

A white film may develop on the glass front during the first few fires as part of the curing process. The glass should be kept clean during the first two weeks of use to prevent the film from baking on (making it very difficult to remove). See Cleaning Glass on Page 5.

WARNING

If the information in this manual is not followed exactly,a fireorexplosion may result causing prop- erty damage, personal injury or loss of life.

WARNING

Failure to comply with the instal- lation and operating instructions provided in this document will result in an improperly installed and operating appliance, voiding its warranty. Any change to this appliance and/or its operating controls is dangerous. Improper installation or use of this appli- ance can cause serious injury or death from fire, burns, explosion or carbon monoxide poisoning.

IMPORTANT

These appliances must not be connected to a chimney or flue serving a separate solid fuel burning appliance.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

WARNING

Do not use these appliances if any part has been under water. Immediately call a qualified, professional service technician to inspect the appliances and to replace any parts of the control system and any gas controls which have been under water.

WARNING

Do not attempt to alter or modify the construction of the appli- ance or its components. Any modification or alteration may void the warranty, certification and listings of this unit.

WARNING

Improper installation, adjust- ment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information consult a qualified installer, service agency or the gas supplier.

WARNING

These fireplaces are vented heaters. Do not burn wood or other material in these appli- ances.

WARNING

This appliance is only for use with the type of gas indicated on the rating plate. This appliance is not convertible for use with other gases, unless a certified kit is used.

WARNING

Do not place clothing or other flammable materials on or near this appliance.

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