Lennox International Inc MPB35ST-NM This appliance is not designed to burn wood. Any attempt to

10.Place Log (E) as shown in Figure 13.

Position round end of log (E) against the notch of log (D) here. Two charred spots face the front

E

D

C

Position Small End of	(Valve Access Side)
Log (E) on The Notch of
Log (C) Here	Figure 13

11.Place Log (F) as shown in Figure 14.

Log (F) sits in front of the grate

WARNING

Logs get very hot and will remain hot up to one hour after gas supply is turned off. Handle only when logs are cool. Turn off all electricity to the appliance before you install grate and logs.

BURNER ADJUSTMENTS (QUALIFIED TECHNICIANS ONLY)

If the air shutter openings 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 entering 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.

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 per- sists, adjust the air shutter to a more closed position, then operate the appliance for a few more minutes to ensure that the flame normalizes and the flames do not appear sooty.

(Valve Access Side)
F	Figure 14

WARNING

This appliance is not designed to burn wood. Any attempt to

Flame Appearance & Sooting

Proper flame appearance is a flame which is blue at the base andbecomesyellowish-orangein the body of the flame. When the applianceisfirstlit,theentireflame maybeblueandwillgraduallyturn yellowish-orange during the first

15minutes of operation. If after period the flame stays lowered blue, or if the flame is orange with evidenceofsooting(blacktip),the air shutter opening may need to be adjusted.

Figure 15 *- Burner Flame Appearance

Vermiculite

10

do so could cause irreparable damage to appliance and prove hazardous to your safety.

WARNING

If logs are not installed according totheloginstallationinstructions, flame impingement and improper combustioncouldoccurandresult in soot and/or excessive produc- tion of carbon monoxide (CO), a colorless, odorless, toxic gas.

WARNING

DO NOT attempt to install the logs untiltheapplianceinstallationhas been completed, the gas line con- nected and tested for leaks and the initial burner operation has been checked out.

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

WARNING

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

WARNING

Ensure front glass panels are in place and sealed during adjust- ment.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

CAUTION

The air shutter door and nearby appliance surfaces are hot. Exer- cise caution to avoid injury while adjusting flame appearance.

CAUTION

Carbon will be produced if the air shutter is closed too much. Any damage due to carboning result- ing from improperly setting the air shutter is not covered under the warranty.

Burner Air Shutter Adjustment Procedure

1. Locate adjustment rod and adjust air shutter to the standard setting as shown in Figure 16 (adjustment rod is located in the lower control area). Note: Rotating the adjustment rod counterclockwise decreases air and clockwise increases air.