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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX MERIT
®
SERIES B-VENT GAS FIREPLACES • 42" LMBV MODELS • INSTALLATION INSTRUCTIONS
Replace logs if removed for pilot inspection.
To light the burner; turn “ON” the remote wall
switch and rotate the gas valve control knob
counterclockwise to the “ON” position (“ON”
will be to the left hand side of the valve).
Electronic Appliance Checkout
To light the burner, turn ‘ON’ the optional remote
wall switch and turn the gas control switch to
the “ON” position. Ensure the ignitor lights the
pilot. The pilot ame should engulf the ame
rod as shown in Figure 20.
Figure 19
3/8” Min
(9 mm)
Hood
Pilot
Nozzels
Ignitor Rod
MANUALLY-RESET BLOCKED FLUE SAFETY
SWITCH
This appliance is equipped with a manually-
reset blocked ue safety switch. Refer to
Figure 18 for its location. If during appliance
operation, the ame goes out (independently of
the burner on/off wall switch), it may be due to
the operation of this safety limit switch. First
allow the appliance to cool. Then reset the
safety switch by pushing the red reset button
on the back of the switch.
CAUTION: THE ELECTRONIC APPLIANCE
SHOULD BE TURNED OFF BEFORE REMOVING
THE LIMIT SWITCH.
To access the safety limit switch reset button,
remove the screen rod and screen from the right
side of the fireplace. Unscrew two screws and
remove the limit switch with low voltage wires
attached. Push the reset button, then reinstall
the limit switch. Reinstall the screen and rod. At
this time turn the electronic appliance back on.
The appliance should then relight and remain
lit. If this does not occur, turn off the appliance
and call a qualified service technician.
Millivolt Appliance Checkout
The pilot ame should be steady, not lifting
or oating. Flame should be blue in color with
traces of orange at the outer edge.
Figure 18
Limit Switch Screws
Manual
Reset
Limit
Switch
Screen
Rod
Lintel Extension Right Side Refractory Panel
Screen
The top 3/8" (9 mm) at the pilot generator
(thermopile) should be engulfed in the pilot
ame. The ame should project 1" (25 mm)
beyond the hood at all three ports (Figure 19 ).
Figure 17
Operate the actuator through several cycles
including the "lock" position. Ensuring proper
operation and freedom of movement. Return
the actuator arm to the locked position.
Step 8. Installing Logs and Rockwool – The
logs are packaged and boxed within the firebox.
The bag of rockwool is in the lower control
compartment. Remove the rockwool from the
packaging and tear into quarter size pieces (see
Homeowners Care and Operation Instructions).
Carefully position the ceramic fiber log assembly
onto the burner, refer to the Homeowners Care
and Operation Instructions for detailed log de-
scription and placement instructions. Position
the logs onto the pins of the burner, with the
cutouts fitted around the burner tube. Ensure
the rear log matches the cutout on its bottom
with the position of the pilot.
APPLIANCE OPERATION
Step 9. Checking the System – With the
gas line installed, run initial system checkout
before closing up the front of the unit. Follow
the pilot lighting instructions provided in the
Homeowner's Care and Operation Instructions.
The piezo ignitor is located in the control com-
partment (see Figure 13 ).
Note: Instructions are also found on the pull
out labels attached to the gas control valve.
The valve is shown in Figure 17.
When first lighting the appliance, it will take a
few minutes for the line to purge itself of air.
Once purging is complete, the pilot and burner
will light and operate as indicated in the instruc-
tion manual.
Subsequent lightings of the appliance will not
require such purging. Inspect the pilot ame
(remove logs, if necessary, handling carefully).
SIT Valve