Lennox Hearth LSM40ST-N-PV Burner Adjustments, Flame Appearance and Sooting, Pilot Assembly

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

16

Burner Adjustments

(QUALIFIED TECHNICIANS ONLY)

Flame Appearance and Sooting

Proper flame appearance is a flame that is blue at the base and becomes yellowish-orange in the body of the flame. When the appliance is first lit, the entire flame may be blue and will gradually turn yellowish-orange during the first 30 minutes of operation. After 30 minutes of operation, if the flame is blue, or if the flame is orange with evidence of sooting (black tip), the air shutter opening may need to be adjusted.

If the air shutter opening is closed too far, sooting may develop. Sooting is indicated by black puffs developing at the tips of very long orange flames. Sooting results in black deposits forming on the logs, appliance inside surfaces and on exterior surfaces adjacent to the vent termination.

Sooting is caused by incomplete combustion in the flames and lack of combustion air enter- ing the air shutter opening. To achieve a warm yellowish-orange flame with an orange body that does not soot, the shutter opening must be adjusted between these two extremes.

Burner Air Shutter Adjustment Guidelines

•If there is smoke or soot present, first check the log set positioning to ensure that the flames are not impinging on any of the logs. If the log set is properly positioned and a sooting condition still exists, then the air shutter opening should be increased.

•The more offsets in the vent system, the larger the air shutter opening will need to be.

•An appliance operated with the air shutter opened too far, may have flames that appear blue and transparent. These weak, blue and transparent flames are termed anemic.

•Propane models may exhibit flames which candle or appear stringy. If this is present and persists, adjust the air shutter to a more OPEN position, then operate the appliance for a few more minutes to ensure that the flame normalizes and the flames do not appear sooty.

The following chart is provided to aid you in achieving the correct air shutter adjustment for your installation.

Air Shutter Adjustment Guidelines:

Amount of

Flame

Air Shutter

Primary Air

Color

Adjustment

 

 

 

 

 

 

 

If air shutter is

Flame will

Air shutter

closed too far

be orange

gap should be

 

 

 

 

 

 

increased

 

 

 

 

 

 

If air shutter is

Flame will

Air shutter

open too far

be blue

gap should be

 

 

 

 

 

 

decreased

 

 

 

 

 

 

Burner Air Shutter Adjustment Procedure

WARNING

Hot GLASS WILL CAUSE BURNS.

DO NOT TOUCH GLASS UNTIL COOLED.

•Fireplace surfaces get EXTREMELY HOT!

•The glass on the front of the fireplace reaches EXTREMELY HIGH temperatures and can cause severe burns if touched. Even after the gas is turned off, fireplace surfaces remain extremely hot.

CAUTION

Risk of personal injury

or property damage.

•Air shutter adjustment should only be performed by a qualified professional service technician.

•Soot will be produced if the air shutter is closed too much. Any damage due to carboning resulting from improperly setting the air shutter is not covered under the warranty.

1.Light the appliance (follow lighting proce- dure in Care and Operation Instructions or on lighting label in control compartment).

2.Allow the burner to operate for at least 30 minutes while continuously observing the flame to ensure that the proper flame ap- pearance has been achieved (see Figures 21 and 22).

3.Adjust the air shutter using the Air Shutter Adjustment Lever on the lower right side of the firebox (see Figure 21).

•For more OPEN air shutter, slide lever to the RIGHT.

•For more CLOSED air shutter, slide lever to the LEFT.

A minimum shutter setting is designed into the venturi by four 1/16"‑inch tabs.

•If the flame appears weak or sooty (as described on the previous page), adjust the air shutter until proper flame appear- ance is achieved.

•If flame stays lowered blue, incremen- tally adjust the air shutter to a more CLOSED position until proper flame appearance is achieved.

Note: See Figures 21 and 22 for proper burner flame appearance.

Volcanic Stone

Air Shutter

Adjustment Lever

Burner Flame Appearance

(Control Side)

Figure 21

Volcanic Stone

Burner Flame Appearance

(Opposite Control Side)

Figure 22

Electronic Appliance Checkout

To light the burner, refer to the lighting instruc- tions on Page 20. Ensure the igniter lights the pilot. The pilot flame should engulf the flame sensor as shown in Figure 23.

PILOT ASSEMBLY

Proper Pilot Flame Appearance

Igniter

Rod

Pilot Hood

Flame

Sensor

Pilot

Nozzels

Figure 23

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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Contents LSM40ST-N-PV 506025-03 Rev. C 04/2011Whats Inside ModelsSafety Your Fireplace Spanish Seguridad y su chimenea Important Safety Information Et toute commande qui a été plongée dans l’eauAttaching Safety-in-Operation Warnings Colocación de advertencias de seguridad en operaciónLennox Hearth Products LennoxWarranty Information Appliance Installation, Service, and Maintenance NoticesAppliance Operation Notices General Information EfficienciesOperation and care of your appliance Gas ControlsAppliance Operation Purge CycleRemote Control System Using the Remote Transmitter Press the ON/OFF key Key LockManual Bypass of the Remote System Flame LevelMaintenance Install only when fireplace is OFF and Cold Install one of the glass doors, as followsHot Glass will Cause Burns Removing Glass Doors, Mesh Pull Screens, and Modesty PanelPlacement of Volcanic STONE, Glowing EMBERS, and Logs Bag of Glowing EmbersControl Side Control Side Top view of burner shownLog, Top Left Log, Center Log, Top RightLog, Top Front Groove Location PinDetail Burner Adjustments Burner Air Shutter Adjustment GuidelinesPilot Assembly Flame Appearance and SootingOrdering Replacement parts Wiring DiagramProduct Reference InformationAccessory Components Andiron KitsCeramic and Porcelain Panel Kits Bag of Glowing Embers Bag of Volcanic StoneOutdoor Kit Arch Screen KitsClassic Screen Kits Barrier Screen KitsFor Your Safety Read Before Operating What to do if YOU Smell GASOperating Instructions To Turn OFF GAS to ApplianceQUE Faire SI Vous Sentez UNE Odeur DE GAZ Pour Plus DE Sécurité Lire Avant DE Mettre EN MarcheComment Couper L’ADMISSION DE GAZ DE L’APPAREIL Maintenance Schedule Maintenance TaskProcedure Do not touch or attempt to clean glass while hotSymptom Possible causes Corrective action Troubleshooting Guide Power Vent System StartGas Controls SIT Electronic Replacement Parts ListCat. No Replacement Parts Illustration Power Vent Replacement Parts 2520506025-03 Rev. C 05/2011

LSM40ST-N-PV specifications

The Lennox Hearth LSM40ST-N-PV is a premium gas fireplace that combines elegance with advanced technology to create an unparalleled heating experience. Designed for both aesthetic appeal and functional efficiency, this model is perfect for homeowners seeking to enhance their living spaces while enjoying the warmth of a traditional fireplace.

One of the standout features of the LSM40ST-N-PV is its sleek and contemporary design. The fireplace boasts a clean face, which allows for a larger viewing area, ensuring that the mesmerizing flames become the focal point of any room. Its glass front adds a modern touch, making it suitable for various interior styles, from classic to contemporary.

In terms of performance, this gas fireplace utilizes the latest innovations in venting technology, offering versatility for installation. The direct vent system draws air from outside for combustion, ensuring optimal efficiency while maintaining indoor air quality. This feature allows homeowners to enjoy a cozy fire without worrying about the impact on the surrounding environment.

The LSM40ST-N-PV is equipped with a powerful, multi-functional remote control, enabling users to adjust the flames, heat settings, and even the blower fan from the comfort of their couch. This user-friendly control system enhances the overall convenience and allows for a customized heating experience.

Another significant characteristic of the Lennox Hearth LSM40ST-N-PV is its high-efficiency rating. With minimal heat loss and effective distribution, this fireplace quickly warms up spaces, offering comfort even during the coldest months. The model also features an adjustable flame height, allowing homeowners to create the perfect ambiance, whether for a cozy evening or a festive gathering.

In terms of aesthetics, the fireplace can be fitted with a variety of decorative media options, such as glass, logs, or stones, catering to individual tastes and enhancing the visual appeal. Additionally, the unit operates quietly, ensuring that the crackle of flames is the only sound heard, promoting a peaceful environment.

Durability is also a key attribute of the LSM40ST-N-PV. Constructed from high-quality materials, it's built to last while requiring minimal maintenance. Easy installation and clear documentation mean that homeowners can enjoy their new fireplace with ease.

In summary, the Lennox Hearth LSM40ST-N-PV gas fireplace offers modern design, advanced technologies, and exceptional efficiency, making it a perfect addition to any home looking to elevate its comfort and style.
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