Lennox Meris Series MLDVT-30NM Installation Instructions Manual page 39

LENNOX HEARTH PRODUCTS • MERIT
Step 8. See Figure 59 and replace the pilot
orifice as follows: Remove pilot hood assembly
to access the phillipped 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.
All Models
Step 9. (Refer to Figure 55 on Page 38 and
Figure 60)
VERIFY THE PROPER ORIFICE SIZE
BEFORE INSTALLING IT.
A. Remove the orifice from the manifold and
replace it with the one provided in the kit. See
Table 9 for orifice sizes for natural and pro-
pane 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 ap-
plications, do not use pipe joint compounds
on flare fittings).
B. Retrieve the burner and slide the venturi
tube over the orifice. Set the shutter adjust-
ing opening as shown in Figure 50, Page 32.
SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS
®
Burner Orifice Sizes
Elevation 0-4500 feet ( 0-1372 meters)
Model Nat.Gas
Series drill size (inches)
#50 (0.070")*
MLDVT-30
•
H4873
(0.0748")*
MLDVT-35
•
H1355
#44 (0.086")*
MLDVT-40
•
60J80
(0.090")*
MLDVT-45
•
37L70
*
Standard size installed at factory.
Table 9
•
Part /Cat. Number.
BURNER
ORIFICE
Figure 60
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Step 10. Reassemble the remaining compo-
nents by reversing the procedures outlined in
the preceding steps.
Propane
drill size (inches)
Step 11. Attach the conversion label provided
#59 (0.041")* in the conversion kit to the rating plate on the
•
appliance.
H7838
(0.045")*
Step 12. Turn on gas supply and test for gas
•
75L10
leaks. See Test All Connections For Gas Leaks
#55 (0.052")*
on Page 27.
•
19L52
Step 12. Attach manometer to the manifold
#54 (0.055")*
side pressure test fitting and verify manifold
•
99K79
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.
39