Lennox Hearth LSM40ST-N-PV Inputs and Efficiencies, Orifice Sizes, Burn-inPeriod, Page, A, Table

LENNOX HEARTH PRODUCTS • MONTEBELLO® SEE-THROUGH POWER VENT DV GAS FIREPLACES (LSM40ST-N-PV) • CARE AND OPERATION INSTRUCTIONS

GENERAL INFORMATION

The fireplace models covered in this manual are direct-vent, sealed combustion gas fire- places designed for residential application. Direct-vent appliances operate with the com- bustion chamber completely isolated from the indoor environment.

All air for combustion is brought in from the outside, and exhaust gases are vented through the same direct-vent, coaxial (intake/exhaust) vent system.

These appliances are designed to operate on natural or propane gas (propane units are avail- able as a field conversion only). The system is switchable between standing and intermit- tent pilot modes. External electrical power is required to operate these units.

These models come standard with a remotely modulated gas valve. The included transmitter remotely controls flame appearance and heat output (manual gas valve adjustment is not possible).

These appliances comply with National Safety Standards and are tested and listed by Intertek (Report No. 100326550PRT-001) to ANSI Z21.88 (in Canada, CSA-2.33), and CAN/CGA- 2.17-M91 (CSA P4.1) in both USA and Canada, as vented gas fireplace.

The installation must conform to local codes or, in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 - lat- est edition, or the Natural Gas and Propane Installation Code, CAN/CSA-B149.1 - latest edition. The appliance, when installed, must be electrically grounded in accordance with local codes or, in the absence of local codes, with the National Electrical Code, ANSI/NFPA 70 - latest edition, or the Canadian Electrical Code, CSA C22.1 - latest edition.

Inputs and Efficiencies

Appliance BTU inputs are listed in Table 1A. Appliance efficiencies are listed in Table 1B.

Inputs

Gas Type (Fireplace Model)	Inputs
Natural Gas	40,000 to 60,000
(LSM40ST-N-PV)	BTU/hr
Liquid Propane	43,500 to 56,000
(LSM40ST-N-PV field-
	BTU/hr
converted to LP)
Table 1A

EFFICIENCIES

Gas Type (Fireplace Model) AFUE EnerGuide

Natural Gas	68%	62%
(LSM40ST-N-PV)
Table 1B
	Gas Fireplace Energy Ef￿ciency Rating
	Based on CSA P.4.1-02

Gas Pressure Requirements (All Models)

Tables 2 and 3 show the appliances’ gas pres- sure requirements.

Inlet Gas Supply Pressure (all models)

Fuel #	Minimum	Maximum
Natural	5.0" WC	10.5" WC
Gas	(1.24 kPa)	(2.61 kPa)
Liquid	11.0" WC	13.0" WC
Propane*	(2.74 kPa)	(3.23 kPa)
Table 2	*Available as field conversion only.

Manifold Gas Supply Pressure (all models)

Fuel #	Low	High
Natural	(Lo) 1.6" WC	(Hi) 3.5" WC
Gas	(0.4 kPa)	(0.87 kPa)
Liquid	(Lo) 6.3" WC	(Hi) 10.0" WC
Propane*	(1.57 kPa)	(2.49 kPa)
Table 3	*Available as field conversion only.

Test gauge connections are provided on the front of the gas control valve, identified IN for the inlet and OUT for the manifold side (see Figure 3 on Page 9 ). The control valve has a 3/8" (10 mm) NPT thread inlet and outlet side of the valve.

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 dur- ing 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 (see Table 4 ).

For higher elevations, contact your gas supplier or qualified service technician.

Burner Orifice Sizes

(USA and Canada)

Elevation 0-4500 ft (0–1372 m)

Natural Gas	Propane
Drill size (inches)	Drill size (inches)

#32 (0.116") 	#52 (0.0635") 
[Cat. No. H8002]	[Cat. No. H8003]

Standard size installed at factory.

Table 4  Standard size in LP conversion kit.

Deration

At the time of installation, it must be deter- mined if the appliance needs to be derated. Contact your local gas supplier for deration requirements for your area.

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 CAN/CSA-B149.1 codes - latest edition.

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.

NOTICE: A white film may develop on the glass enclosure panel during the first few fires as part of the burn-in process.

The first few times you use the fireplace, clean the glass after each use

(AFTER THE GLASS HAS COMPLETELY COOLED); otherwise, the white film will bake onto the glass and become difficult to remove.

See glass cleaning instructions on

Page 9.

7

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.