Step 6. Connecting Gas Line - Lennox LSM40ST-N Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MONTEBELLO
Step 6. CONNECT 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 local codes.
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 glass door assembly on
the control side (see Page 29) and the access
plate (see Figure 37).
The electronic control valve has a 3/8" (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
applications). Seal around gas line to prevent
cold air leakage. Use sealants approved by
local codes for the application.
Gas
Valve
3/8" Nipple
3/8" Union
3/8" Close
Nipple
Gas Solid Line Connector
Figure 36
24
SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS
®
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 effec-
tive 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. See the lighting instruc-
tions label in the fireplace control compart-
ment or Care and Operation Instructions.
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.
Eithertightenorrefastentheleakingconnection;
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. Reinstall the access plate, making certain the
gasket has not been damaged.
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.
WARNING
GAS CONNECTION
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
Right Side
Modesty Panel
Access Panel
Main Gas
Shut-Off Valve
Gas Valve
ON/OFF Switch*
Control
Compartment
Access
*ON/OFF Switch - Switches from intermittent
ignition to a standing pilot (a standing pilot
stays lit when fireplace is off).
Figure 37