Lennox MLDVT-35NM - Variable Flame Adjustment

9
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
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
Note: Install fresh batteries in the battery
holder prior to the start of burn season, so
the fireplace can automatically switch to
battery power (4 "AA" batteries) in the event
of a power outage.
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:
•Conrmbatteriesinstalledinbatterypack.
•Turnunitmountedswitchorwallswitch
to the ON Position.
•Unitshouldsparkatpilotandlight.
NOTE: If no spark, replace batteries.
•OperateNormally.
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).
CPI (Continuous Pilot Ignition) Switch
Models equipped with SIT electronic gas
valves may have a CPI switch located in the
lower control compartment (Figure 1).
This switch allows the pilot to be switched
from intermittent mode (pilot is extinguished
when the fireplace is OFF) to continuous
mode (pilot stays on when fireplace is OFF).
In periods of extreme cold, you may notice
condensation on the glass door when the
fireplace is OFF and the pilot is in intermittent
mode. Also, with the pilot in intermittent
mode, you may ocassionally experience
"cycle startup", where the pilot and burner
ignite but then the burner may extinguish and
reignite several times until the flue reaches
temperatures for proper drafting. Switching
the pilot to continuous mode during
periods of extreme weather may eliminate
condensation on the glass door and "cycle
startup". In more moderate weather, return
the pilot to intermittent mode.
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 directions.
Check batteries, if installed, routinely (every
three months).
Orange Wire
(from DFC
Wire
Harness)
Main
Gas Inlet
3/8 in. NPT
Green Wire
(from DFC Wire
Harness)
Inlet (IN) Test Port
Manifold (OUT)
Test Port
Figure 4: SIT Electronic Gas Valve
Hi/Lo
Flame
Control
Knob
Yellow Ground Wire
(from DFC
Wire Harness)