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SUPERIOR
Step 4. Carefully remove the logs. Exercise
care so as not to break the logs.
Step 5. Remove the burner.
A. Remove the sub floor.
B. Remove the two (2) screws securing the
burner assembly.
C. Remove the burner assembly with
attached venturi tube.
Ignition System
Step 6. SIT Systems—Refer to Figure 59
and the instructions provided with the SIT
Regulator Conversion Kit. Using a Torx T20
driver (with 1/4 in. shank and center hole)
or slotted screwdriver, remove and discard
the three (3) pressure regulator mounting
screws, pressure regulator tower, the
diaphragm assembly (if applicable) and the
spring. Discard all removed components.
Step 7. Install the new pressure regulator
assembly using the supplied screws as
shown in Figure 59. Tighten the screws to
25 in-lb..
f i r e - p a r t s . c o m
Pressure
Regulator
Remove
These
Components
Figure 58: Millivolt Valve
Step 8. Install the enclosed identification
label to the valve body where it can be easily
seen.
Step 9. Refer to Figure 60 and replace the
pilot orifice.
Remove the pilot hood assembly to access
the hexed pilot orifice. Remove and replace
the orifice with the one provided with the kit.
Exercise extreme care to prevent damage to
or breakage of the igniter assembly.Step 10.
Refer to Figure 60 and replace the burner
orifice.
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.
LENNOX
, the LENNOX design, DAVE LENNOX, the image of DAVE LENNOX and other related
®
LENNOX marks are registered or common law trademarks of Lennox Industries Inc. and are used
with permission.
Printed in U.S.A. © 2012 Lennox Hearth Products LLC
P/N 506009-03 Rev. NC 06/2012
• DIRECT VENT GAS FIREPLACES (SDV35-N-2) • INSTALLATION INSTRUCTIONS
®
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 60 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 hold the venturi
tube above the orifice. Place the shutter
adjusting rod in the propane slot of the
shutter arm (see Figure 56 on Page 31).
Set the burner assem bly into its position
and secure the trapezoidal plate with the two
screws previously removed.
C. Reinstall the baffle with the two baffle
securing screws.
Step 11. Reassemble the remaining
components by reversing the procedures
outlined in the Steps 1–7.
Step 12. Attach the conversion label provided
in the conversion kit next to the rating plate
on the appliance.
Step 13. Turn on gas supply and test for gas
leaks (refer to Page 27).
Figure 59: Orifice
Step 14. Relight the main burner. The lighting
instructions can be found on the lighting
label in the control compartment or in the
Care and Operation Manual provided with
the appliance. Verify proper burner ignition
and operation. See Burner Adjustments and
Burner Flame Appearance on Page 31.
Inspect the pilot system for proper flame. The
pilot flame should engulf the flame sensor as
shown in Figure 50 on Page 27.
Step 15. Using a manometer, test the inlet
and manifold gas pressures. See Table 3 on
Page 4.
ALWAYS TEST PRESSURES WITH THE
VALVE REGULATOR CONTROL AT THE
HIGHEST SETTING.
Model
Nat.Gas
Series
drill size (inches)
#44 (0.086 in.)*
SDV35-2
60J80•
* Standard size installed at factory
• Part /Cat. Number
Table 13: Burner Orifice Sizes
Elevation 0–4500 ft ( 0–1372 m)
Lennox Hearth Products
1508 Elm Hill Pike, Suite 108 • Nashville, TN 37210
Propane
drill size (inches)
#55 (0.052 in.)*
19L52•
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