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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
DIRECT VENT GAS FIREPLACES (MPDP35/40) • CARE AND OPERATION INSTRUCTIONS
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)
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, fireplace logs and burner area.
Check Flame Patterns and Flame Height Qualified Service Technician Refer to Figure 13 (MPDP35) or 14 (MPDP40) on Page 16 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 16 on Page 17. 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 firebox) for
signs of blockage or obstruction. Look for any signs of dislocation or
deterioration of the vent components (reconnect or replace as necessary).
Appliance Checkout Qualified Service Technician Perform the appropriate appliance checkout procedure detailed in this
manual.
Replace Glowing Embers Homeowner/Qualified Service
Technician
Remove old glowing ember materials and vacuum the ember placement
area. Place new embers per instructions on Page 13.
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 Figure 13 (MPDP35) or 14 (MPDP40) on Page 16 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 firebox)
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 (see
Page 11). DO NOT TOUCH OR ATTEMPT TO CLEAN GLASS WHILE HOT.
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