Appliance Operation; Step 9. Check Appliance Operation; Manual Limit Switch; Millivolt Checkout - Lennox Hearth Products LMBV-42RMN Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MERIT

AppLIANCe OpeRATION

Step 9. Check Appliance Operation

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 Care and Operation Instructions. The piezo
Igniter is located in the control compartment
(see Figure 15).
NOTE: Instructions are also found on the pull
out labels attached to the gas control valve.
The valve is shown in Figure 24.
SIT Valve
Figure 24
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 instruction manual.
Subsequent lightings of the appliance will not
require such purging. Inspect the pilot flame
(remove logs, if necessary, handling carefully).
14
SERIES B-VENT GAS FIREPLACES • 42" LMBV MODELS • INSTALLATION INSTRUCTIONS
®
Manual
Reset
Limit
Switch
Figure 25
Lintel Extension

manual Limit Switch

(manually-reset blocked flue safety switch)
This appliance is equipped with a manually-
reset blocked flue safety switch. Refer to
Figure 25 for its location. If during appliance
operation, the flame 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 appli-
ance and call a qualified service technician.
millivolt Appliance Checkout
The pilot flame should be steady, not lifting
or floating. Flame should be blue in color with
traces of orange at the outer edge.
The top 3/8" (9 mm) at the pilot generator
(thermopile) should be engulfed in the pilot
flame. The flame should project 1" (25 mm)
beyond the hood at all three ports (Figure 26).
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).
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Limit Switch Screws
Right Side Refractory Panel
Hood
Igniter Rod
Pilot
Nozzels
Figure 26 - Millivolt Pilot
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 Igniter lights the
pilot. The pilot flame should engulf the flame
rod as shown in Figure 27.
proper Flame
Adjustment
pilot
Nozzels
Figure 27 - Electronic Pilot
Screen
Rod
Screen
3/8" Min
(9 mm)
3/8" to 1/2"
(9 -13 mm)
Ground
electrode
Flame Rod
Hot Surface
Igniter