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LENNOX HEARTH PRODUCTS • MERIT
®
SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • 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, replace logs and
burner area.
Check Flame Patterns and Flame
Height
Qualified Service Technician Refer to Figure 11 (MLDVT-35), Figure 12 (MLDVT-40) 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/flame 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 (recon-
nect or replace as necessary). Note: Excessive condensation
can cause corrosion of caps, pipe and fittings (excessive con-
densation 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 Embers Homeowner/Qualified Service
Technician
Remove old ember materials (rockwool) and vacuum the ember
placement area. Place new embers as described and shown in
Figures 9 and 10.
Periodically (After the Burning Season)
MAINTENANCE TASK ACCOMPLISHING PERSON PROCEDURE
Clean Firebox Interior Homeowner Carefully remove logs, glowing embers and volcanic stone.
Vacuum out interior of the firebox. Clean firebox walls and log
grate. Replace logs, glowing embers, and volcanic stone as
detailed in this manual.
Check Flame Patterns and Flame
Height
Homeowner Refer to Figures 11 (MLDVT-35) and 12 (MLDVT-40) 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.
Check Vent System Homeowner 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 of the vent components (reconnect or replace as
necessary).
Clean Front Glass Enclosure Panel Homeowner Clean as necessary following the directions provided in this
manual. DO NOT TOUCH OR ATTEMPT TO CLEAN GLASS
WHILE HOT.
MAINTENANCE SCHEDULE
Turn off gas and electrical power to the fireplace and allow it to cool before cleaning or servicing the appliance.
Annually (Before the onset of the Burning Season)