Lennox Hearth LSM40ST-N-PV Flame Appearance and Sooting, Electronic Appliance Checkout, Figure

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.