LENNOX HEARTH PRODUCTS • MONTEBELLO®
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 20 and 21).
3.Adjust the air shutter using the Air Shutter Adjustment Lever on the lower right side of the firebox (see Figure 20).
•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 20 and 21 for proper burner flame appearance.
Electronic Appliance Checkout
To light the burner, refer to the lighting instruc- tions on Page 21. Ensure the igniter lights the pilot. The pilot flame should engulf the flame sensor as shown in Figure 22.
PILOT ASSEMBLY
Proper Pilot Flame Appearance
Igniter
Rod
Pilot Hood
Flame 
Sensor
Pilot
Nozzels
Figure 22
17
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
