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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT
®
SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • CARE AND OPERATION INSTRUCTIONS
Figure 3 - SIT Millivolt Gas Valve
Variable Flame
Height Adjustment
Manifold Pressure
Port
Inlet
Pressure
Port
Main Gas Control Knob
H
I
L
O
W
TPTH TP TH
P
I
L
O
T
P
I
L
O
T
O
N
it
O
F
F
IN
OUT
Gas Inlet
Terminals TPTH, TP and TH
Gas
Outlet
Figure 4 - Dexen Electronic Gas Valve
Variable Flame
Height Adjustment
Manifold Pressure
Port
Inlet
Pressure
Port
Main Gas Control Knob
H
I
L
O
W
TPTH TP TH
P
I
L
O
T
P
I
L
O
T
O
N
it
O
F
F
IN
OUT
Gas Inlet
Terminals TPTH, TP and TH
Gas
Outlet
Supply Gas
Inlet
Pressure-Tap
(Manifold)
Regulator
Mounting
Screw
Burner Stage
Terminal
Gas
Outlet
To Burner
Ground (TP)
Pilot Stage
Terminal
Pilot Gas Outlet
Pressure-Tap
(Inlet)
PILOT
OUT
VENT
LO
TH
TP
TH
TP
HI
IN
IN
Note: It is recommended that batteries not
be installed in the battery holder until a power
outage, or if the appliance is to be operated
solely with two (2) "D" batteries.
Refer to the Lighting Instructions on Page 23
to light the appliance in the event of a power
failure.
TO LIGHT YOUR APPLIANCE IN A POWER
OUTAGE DO THE FOLLOWING:
•Installbatteriesinbatterypack.
•Turnunitmountedswitchorwallswitch
to the ON Position.
•Unitshouldsparkatpilotandlight.
•OperateNormally.
•Replacebatteriesifneeded.
•Afterpowerisrestored,removebatter-
ies.
Variable Flame Height Adjustment
All millivolt and electronic appliances are
equipped with a variable gas control valve. Flame
height for these models may be adjusted through
a range between fixed low and high settings while
the appliance is in operation. Adjust the flame
height as desired after lighting the appliance by
rotating the variable adjustment control knob
(HI/LO) located on the front of the valve (refer
to Figures 3 and 4).
Electronic Appliances
To light electronic appliances refer to the detailed
lighting instructions found on Pages 23 and
24 of these instructions. Electronic appliance
lighting instructions may also be found on the
pull out lighting instruction labels attached to
the gas control valve.
If your electronic appliance is equipped with an
optional remote wall switch or remote control kit
the appliance main burner may be turned on and
off with the wall switch or remote control.
If your electronic appliance is not equipped
with a wall switch or remote control, the main
burner must be turned off and on with a gas
control switch located in some other location
by the installer. Contact the installer for direc-
tions. Check batteries, if installed, routinely
(ever three months).