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LENNOX HEARTH PRODUCTS • MONTEBELLO
Step 5. REMOVE GLASS DOOR FRAME
Remove the glass door assembly. See
Installation and Removal of Glass Door on
Page 26.
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 36 illustrates two
methods for connecting the gas supply. A Sedi-
ment Trap is recommended to prevent moisture
and debris in gas line from damaging the valve.
The flex-line method is acceptable in the U.S.A.
where local codes permit, however, Canadian
requirements vary depending on locality. Instal-
lation 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 36 for flex-line description. The
flex-line is rated for both natural and propane
gas. A manual shut off 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 37).
The electronic control valve has a 3/8 in. (10 mm)
NPT thread gas supply inlet.
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.
Secure all joints tightly using appropriate
tools and sealing compounds (ensure propane
resistant compounds are used in propane ap-
plications). It is recommended to seal around
the gas line to prevent cold air leakage.
Gas
Valve
3/8" Nipple
3/8" Union
3/8" Close
Nipple
Gas Solid Line Connector
Figure 36:
Gas Connection
DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
®
Modesty Panel
Access Plate
Gas Valve
Figure 37
TEST ALL CONNECTIONS FOR GAS LEAKS
(FACTORY AND FIELD):
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).
Note: Using a soapy water solution is an
effective leak test solution but it is not recom-
mended, because the soap residue that is left
on the pipes/fittings can result in corrosion
over time.
Gas Flex Line Connector
3/8" NPT x
1/2" x 3/8" Flare
Flare Fitting
Shut-off Valve
3/8" Flex Tubing
Gas
1/2" x 3/8"
Stub
Reducer
3/8" Shut-off Valve
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Right Side
WARNING
Note: The gas supply line
must be installed in accor-
dance 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"
Min
*Sediment
Trap
A. Light the appliance (refer to the
lighting instructions label in the 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. If
bubbles are formed, or gas odor is detected,
turn the receiver or remote control to the
"OFF" position. 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.
Step 7. CHECKING 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 lighting instructions provided
in the Care and Operation Instructions
manual.
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).
Electronic Appliance Checkout
To light the burner, turn 'ON' the optional
remote wall switch or turn the appliance
mounted ON/OFF switch to the "ON" position.
Ensure the igniter lights the pilot. The pilot
flame should engulf the flame sensor as
shown in Figure 38.
Igniter
Pilot
Hood
Flame Rod
(Sensor)
Figure 38
23
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