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LENNOX HEARTH PRODUCTS • MONTEBELLO
Step 6. CONNECTING GAS LINE
All codes require a shut-off valve mounted in
the supply line. The orientation of the shut-
off valve should face the front. Figure 30
illustrates two methods for connecting the
gas supply. A Sediment Trap is recommended
to prevent moisture and debris in gas line
from damaging the valve.
The flex-line method is acceptable in the USA
where local codes permit. Installation must
be in compliance with local codes. These
appliances are equipped with a gas flex-line
for use in connecting the unit to the gas line.
See Figure 30 for flex-line description.
A manual shutoff valve is also provided with
the flex-line. The gas control valve is located
on the right side of the unit.
When using solid gas line connector, access
the valve by removing the front door
assembly on the valve access side and the
access plate (see Figure 29).
The electronic control valve has a 3/8 in.
(10 mm) NPT thread gas supply inlet.
Secure all joints tightly using appropriate
tools and sealing compounds.
Bring the shutoff valve on the end of the
flex-line over to the hard pipe and tighten
with wrenches from above through the
firebox opening.
Right Side
Modesty Panel
Access Plate
Gas Shutoff
Valve
Gas Valve
Figure 29: Fireplace Right Side
TEST ALL CONNECTIONS FOR GAS LEAKS
(FACTORY AND FIELD)
WARNING
Never use an open flame to
check for leaks.
Turn on gas supply and test for gas leaks using
a gas leak test solution (also referred to as
bubble leak solution).
DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS
®
NOTE: Using a soapy water solution is
an effective leak test solution but it is not
recommended, because the soap residue
that is left on the pipes/fittings can result
in corrosion over time.
A. Light the appliance (refer to the
lighting instructions label in control
compartment or in the Care and Operation
instructions manual).
B. Brush all joints and connections with the
gas leak test solution to check for leaks.
Gas
Valve
3/8 in. Nipple
3/8 in. Union
3/8 in. Close
Nipple
Gas Solid Line Connector
Figure 30: Gas Connection
Step 7. INSTALL FIREBOX LINER KIT
Install the firebox liner kit per the
included instructions.
Step 8. VERIFYING APPLIANCE
OPERATION
Turn on burner then observe the individual
tongues of flame on the burner. Make sure all
ports are open and producing flame evenly
across the burner. If any ports are blocked, or
partially blocked, clean out the ports.
With gas line installed run initial system
checkout before closing up the front
of the unit. Follow the pilot lighting
instructions provided.
NOTE: Lighting Instructions are also found
on the literature tag tied to the bracket
above the gas valve. To access the tag,
reach into the right side opening.
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
lighting of the appliance will not require such
purging. Inspect the pilot flame (remove
logs, if necessary, handling carefully).
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
If bubbles are formed, or gas odor is
detected, turn the unit off. Either tighten
or refasten the leaking connection, then
retest as described above.
C. When the gas lines are tested and leak
free be sure to rinse off the leak testing
solution.
D. Re-install the access plate, making certain
the gasket has not been damaged.
Gas Flex Line Connector
3/8 in. NPT x
1/2 x 3/8 in. Flare
Flare Fitting
Shut-off Valve
3/8 in. Flex Tubing
Gas
1/2 x 3/8 in.
Stub
Reducer
3/8 in. Shut-off Valve
Electronic Appliance Checkout
To light the burner, turn the ON/REMOTE/
OFF wall switch or remote control to the ON
position. Ensure the igniter lights the pilot.
The pilot flame should engulf the flame
sensor as shown in Figure 31.
NOTE: The control must detect the pressure
switch in the open state, at startup, and
then close after the blower starts.
Flame
Sensor
Pilot
Nozzels
Figure 31: Electronic Pilot
Assembly—Proper Pilot
Flame Appearance
Note: The gas supply
line must be installed in
accordance with building
codes by a qualified
installer approved and/
or licensed as required
by the locality. In the
Commonwealth of
Massachusetts, installation
must be performed by a
licensed plumber or gas
fitter.
3 in.
Min
*Sediment
Trap
Igniter
Rod
Pilot Hood
21
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