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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
1508 Elm Hill Pike, Suite 108 • Nashville, TN 37210
Figure 59
Step 8. Reassemble the remaining components
by reversing the procedures outlined in the
preceding steps.
Step 9. Attach the conversion label provided
in the conversion kit to the rating plate on the
appliance.
Step 10. Turn on gas supply and test for gas
leaks.
Step 11. Attach manometer to the manifold
side pressure test fitting and verify manifold
pressure reads 3.5 inches water column (0.87
kPa) for natural gas, and 10.0 inches water
column (2.49 kPa) for propane gas.
ALWAYS TEST PRESSURES WITH THE VALVE
REGULATOR CONTROL AT THE HIGHEST
SETTING.
Step 7. (Refer to Figure 56 on Page 31 and
Figure 59)
VERIFY THE PROPER ORIFICE SIZE BE-
FORE INSTALLING IT.
A. Remove the orifice from the manifold and
replace it with the one provided in the kit. See
the following table for orifice sizes for natural
and propane models
. Figure 59 illustrates
the orifice. Use pipe joint compound or
Teflon tape on all pipe fittings before installing
(ensure propane resistant compounds are
used in propane applications, do not use pipe
joint compounds on flare fittings).
B. Retrieve the burner and slide the venturi tube
over the orifice. Set the burner assembly
into its position and secure it.
C. Reinstall the grate assembly.
Step 6. Refer to Figure 58 and remove the
pilot hood assembly to access the hexed pilot
orifice. Remove and replace the orifice with
the one provided with the kit.
SIT Millivolt Gas
Valve Shown
Pressure
Regulator
Remove
These
Components
Figure 57
Millivolt & Electronic Gas Valves
HI
LO
SIT Electronic Gas Valve
Pressure
Regulator
SIT Millivolt Pilot Assembly Shown
Figure 58
Pilot
Orifice
Thermopile
(on millivolt
pilot assem-
blies only)
Millivolt & Electronic Pilot Assemblies
SIT Electronic Pilot
Pilot
Orifice
Burner Orifice Sizes
Elevation 0-4500 feet ( 0-1372 meters)
Model Nat.Gas
drill size (inches)
Propane
drill size (inches)
LSM40-2 .1405" (#28)*
• H2286
.086" (#44)*
• H2287
LSM45-2 .161" (#20)*
• H2288
.093" (#42)*
• H4816
Table 9
* Standard size installed at factory
• Part /Cat. Number
Printed in U.S.A. © 2005 by Lennox Hearth Products
P/N 850,026M REV. E 03/2010
Lennox Hearth Products reserves the right to make changes at any time, without notice, in
design, materials, specifications, prices and also to discontinue colors, styles and products.
Consult your local distributor for fireplace code information.