23
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • CARE AND OPERATION INSTRUCTIONS
Periodically (After the Burning Season)
Maintenance Task Accomplishing Person Procedure
Clean Firebox Interior
Carefully remove logs, glowing embers and
decorative volcanic stone. Vacuum out interior
of the fi rebox. Clean fi rebox walls and log grate.
Replace logs, glowing embers and volcanic
stone as detailed in this manual.
Maintenance Task Accomplishing Person Procedure
Inspect and Clean Burner, Logs
and Controls
Check Flame Patterns and Flame Height
Inspect and Clean Pilot and Burner
Check Vent System
Appliance Checkout
Replace Glowing Embers
Qualifi ed Service Technician
Qualifi ed Service Technician
Qualifi ed Service Technician
Qualifi ed Service Technician
Qualifi ed Service Technician
Homeowner/Qualifi ed Services Technician
Inspect valve and ensure it is properly
operating. Check piping for leaks. Vacuum
the control compartment, fi replace logs and
burner area.
Refer to Figures 10 (MPD33), 11 (MPD35) or
12 (MPD40 & MPD45) on page 16 and verify
the fl ame pattern and height displayed by the
appliance conforms to the picture. Flames
must not impinge on the logs. Ensure fl ames
are steady (not lifting or fl oating).
Refer to Figure 13 (SIT) or Figure 14
(Honeywell) on page 17. Remove any surface
build-up on pilot and burner assembly. Wipe
the pilot nozzles, igniter/fl ame rod and hood.
Ensure the pilot fl ame engulfs the fl ame sensor
as shown.
Inspect the vent system at the top and
at the base (within the fi rebox) for signs
of blockage or obstruction. Look for any
signs of dislocation of the vent components
(reconnect or replace as necessary).
Perform the appropriate appliance checkout
procedure detailed in this manual.
Remove old ember materials and vacuum
the rockwool placement area. Place new
rockwool as described in this document.
MAINTENANCE SCHEDULE
Annually (Before the onset of the Burning Season)
Clean as necessary following the directions
provided in this manual. DO NOT TOUCH OR
ATTEMPT TO CLEAN GLASS WHILE HOT.
Inspect the vent system at the top and at the
base (within the fi rebox) for signs of blockage
or obstruction. Look for any signs of dislocation
of the vent components (reconnect or replace as
necessary).
Refer to Refer to Figures 10 (MPD33),
11 (MPD35) or 12 (MPD40 & MPD45) on
Page 16 and verify the fl ame pattern and height
displayed by the appliance conforms to the
picture. Flames must not impinge on the logs.
Homeowner
Homeowner
Homeowner
Homeowner
Check Flame Patterns and Flame Height
Check Vent System
Clean Front Glass Enclosure Panel
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