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LENNOX HEARTH PRODUCTS • MERIT
See Figure 71 and replace the pilot orifice as
follows: Remove the ignitor assembly retainer
clip, and carefully remove the ignitor assembly.
Exercise extreme care to prevent damage to
or breakage of the ignitor assembly. Remove
the screw securing the pilot assembly to its
mounting bracket. Back off the flare nut at
the end of the pilot gas line to free the pilot
assembly from the gas line. Remove the pilot
orifice and replace it with the one provided with
the conversion kit. Reinstall the pilot assembly
by reversing the steps detailed here.
When reinstalling the ignitor assembly, use
extreme care to prevent damage and break-
age. do not apply any leverage to the ignitor
assembly while restoring the retainer clip to
its original position.
Pilot
Orifice
Retaining
Flare Nut
Note: If the ignitor is damaged, a replacement
kit is available, order Catalog Number 87l54.
Figure 71
40
PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
®
All Models
Use pipe joint compound or Teflon tape on all
pipe fittings before installing (ensure propane
resistant compounds are used in propane ap-
plications, do not use pipe joint compounds
on flare fittings).
Step 8. (Refer to Figure 67 on page 39 )
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 72 illustrates
the orifice.
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 64 on page 34 ). Set the burner assem-
bly into its position and secure the trapezoidal
plate with the two screws previously removed.
Pilot
Assembly
C. Reinstall the baffle with the two baffle
securing screws.
Ignitor
Assembly
Elevation 0-4500 feet ( 0-1372 meters)
Model
Series
MPdT-3328
MPdR-3328
Clip
MPd-3530
MPd-4035
MPd-4540
Table 9
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Burner Orifice Sizes
Nat.Gas
Propane
drill size (inches)
drill size (inches)
#45 (0.0820")*
0.048 inch
39L66•
99K78•
#44 (0.0860")*
#55 (0.0520")*
60j80•
19L52•
#37 (0.1040")*
0.063 inch
24M10•
21L01•
#36 (0.1065")*
#52 (0.0635")*
18L40•
37G00•
* Standard size installed at factory
• Part /Cat. Number
Figure 72
Step 9. Reassemble the remaining components
by reversing the procedures outlined in the
preceding steps.
Step 10. Attach the conversion label provided
in the conversion kit next to the rating plate on
the appliance.
Step 11. Turn on gas supply and test for gas
leaks (refer to page 27).
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