Appliance Operation; Step 9. Check Appliance Operation; Manual Limit Switch; Millivolt Checkout - Lennox Hearth Products LMBV-36RMN 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 • 36" LMBV MODELS • INSTALLATION INSTRUCTIONS
®
Limit
Switch
Screws
Fireplace Front
Figure 25

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 opera-
tion 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 two screws. Pull out limit switch
with low voltage wires attached, push the reset
button, then reinstall the limit switch. 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.
Manual Reset Limit Switch
Left Side Refractory Panel
Hood
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
Lintel
Extention
Igniter Rod
3/8" Min
(9 mm)
3/8" to 1/2"
(9 -13 mm)
Ground
electrode
Flame Rod
Hot Surface
Igniter