Lennox Hearth LSBV-3628EN Millivolt Appliance Checkout, Electronic Appliance Checkout, Hood

Millivolt Appliance Checkout

The pilot flame should be steady, not lifting or floating. Flame should be blue in color with traces of orange at the outer edge.

The top 3/8" (9 mm) at the pilot generator (thermopile) should be engulfed in the pilot flame. The flame should project 1" (25 mm) beyond the hood at all three ports (Figure 20 ).

Hood Ignitor Rod

3/8" Min (9 mm)

Pilot

Nozzels

Figure 20

Replace logs if removed for pilot inspection.

To light the burner; rotate the gas valve control knob counterclockwise to the “ON” position (“ON” will be to the right hand side of the valve). Turn “ON” the remote wall switch.

Electronic Appliance Checkout

To light the burner, turn ‘ON’ the optional remote wall switch. Ensure the ignitor lights the pilot. The pilot flame should engulf the flame rod as shown in Figure 21.

Hood Ignitor Rod

Flame

Sensor

Pilot

Nozzels

Figure 21

Step 10. Adjustments – The following para- graphs address adjustment concerns and pro- cedures.

Flame Appearance and Sooting

Proper flame appearance is a matter of taste. Generally most people prefer the warm glow of a yellow to orange flame. Appliances operated with air shutter openings that are too large, or with long vertical vent runs, will exhibit flames that are blue and transparent. These weak, blue and transparent flames are termed anemic.

If the air shutter opening is too small sooting may develop. Sooting is indicated by black puffs developing at the tips of very long orange flames. Sooting results in black deposits form- ing on the logs, appliance inside surfaces and on exterior surfaces adjacent to the vent termi- nation. Sooting is caused by incomplete com- bustion in the flames and a lack of combustion air entering the air shutter opening.

To achieve a warm yellow to orange flame with an orange body that does not soot, the shutter opening must be adjusted between these two extremes.

No smoke or soot should be present. Reposi- tion the log set if the flames impinge on any of them.

If sooting conditions exist, the air shutter opening on the main burner can be adjusted. Normally, the more offsets in the vent system, the greater the need for the air shutter to be opened further.

WARNING: AIR SHUTTER ADJUSTMENT SHOULD ONLY BE PERFORMED BY A QUALIFIED PROFESSIONAL SERVICE TECHNICIAN.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Adjustment

To adjust the flame, position the air shutter to the nominal setting (Figure 22 ). Allow the burner to operate for at least 30 minutes. Observe the flame continuously. If it appears weak or sooty as previously described, adjust the air shutter open or closed until desired effect is achieved.

Note: If the flame still appears anemic with the air shutter closed all the way (usually a result of lengthy vertical venting runs), turn off the appli- ance, turn off the gas supply, wait for the parts to cool and access the air shutter. The shutter is prevented from actually closing by a tab that is bent over into the opening. Remove this obstruction by bending back. Reassemble and restart the appliance and after 24 minutes reobserve the flame. Adjust the air shutter as described.

Orifice

Air Shutter

Adjusting

Set Screw

	Burner Tube
	Gas	Factory Air
Models		Shutter Setting
	Type
		Inches (mm)
LSBV-3628	Natural	1/8" (3.175 mm)
	Propane	1/2" (12.7 mm)
LSBV-4228	Natural	1/8" (3.175 mm)
	Propane	1/2" (12.7 mm)

Figure 22

When satisfied that the appliance operates prop- erly, proceed to finish the installation. Leave the control knob/lever in “ON” position and turn the remote switch “OFF.” Replace the refractory access panel.

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