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LENNOX HEARTH PRODUCTS • MERIT® SERIES B-VENT GAS FIREPLACES • MODELS MLBV-35, MLBV-40 • CARE AND OPERATION INSTRUCTIONS
MAINTENANCE TASK ACCOMPLISHING PERSON PROCEDURE
Inspect/Clean Burner, Logs,
and Controls
Qualified Service Technician Inspect valve and ensure it is properly operating. Check piping for
leaks. Vacuum the control compartment, logs, and burner area.
Check Flame Patterns and
Flame Height
Qualified Service Technician Refer to Figures 11 and 12 on Page 15 and verify the flame
pattern and height displayed by the appliance conforms to the
picture. Flames must not impinge on the logs. Ensure flames
are steady (not lifting or floating).
Inspect/Clean Pilot and Burner Qualified Service Technician Refer to Figure 14 (SIT Millivolt) or Figure 15 (Electronic) on Page
16. Remove any surface build-up on pilot and burner assembly.
Wipe the pilot nozzles, igniter/ame rod and hood. Ensure the
pilot flame engulfs the flame sensor as shown.
Check Vent System Qualified Service Technician Inspect the vent system at the top and at the base (within the
rebox) for signs of blockage or obstruction. Look for any signs
of dislocation or deterioration of the vent components. Reconnect
or replace, as needed.
Note: Excessive condensation can cause corrosion of caps,
pipe and fittings (excessive condensation can be caused by
long lateral runs, too many elbows and/or exterior portions of
the system being exposed to cold weather). Also inspect wall
straps or plumbers's tape to ensure it is secure and in place.
Appliance Checkout Qualified Service Technician Perform the appropriate appliance checkout procedure detailed
in this manual.
Replace Glowing Ember Materials
(Rockwool)
Homeowner/Qualified Service
Technician
Remove old glowing ember materials (rockwool) and vacuum
the ember placement area. Place new embers as described and
shown in Figures 8–10.
Periodically (after burning season)
MAINTENANCE TASK ACCOMPLISHING PERSON PROCEDURE
Clean Firebox Interior Homeowner Carefully remove logs, glowing embers (rockwool), and volcanic
stone. Vacuum out interior of the firebox. Clean firebox walls and
log grate. Replace logs, rockwool, and volcanic stone as detailed
in this manual.
Check Flame Patterns and Flame Height Homeowner Refer to Figures 11 and 12 on Page 15 and verify the flame pat-
tern and height displayed by the appliance conforms to the picture.
Flames must not impinge on the logs.
Check Vent System Homeowner Inspect the vent system at the top and at the base (within the firebox)
for signs of blockage or obstruction. Look for any signs of disloca-
tion of the vent components. Reconnect or replace, as needed.
Clean Front Glass Enclosure Panel Homeowner Clean as necessary following the directions provided in this manual.
DO NOT TOUCH OR CLEAN GLASS WHILE HOT.