Burner Flame Adjustments; Millivolt Appliance Checkout; Electronic Appliance Checkout; Warranty - Lennox MLDVT-30NM Care And Operation Instructions Manual

Burner air shutter adjustment procedure
1. Locate adjustment rod and adjust air shutter
to the standard setting as shown in Figure
12 (adjustment rod is located in the lower
control compartment).
Note: Rotating the adjustment rod down to
decrease air and up to increase air.
2. Light appliance (follow lighting procedure on
lighting label in control compartment or see
the lighting instructions, pages 18 and 20
in this manual).
3. Allow the burner to operate for at least 15 min-
utes while observing the flame continuously
to ensure that the proper flame appearance
has been achieved (see Figure 10 or 11). If
the following conditions are present, adjust
accordingly.
• If flame appears weak or sooty, adjust
the air shutter, incrementally, to a more
open position until the proper flame
appearance is achieved.
• If flame stays lowered blue, adjust the
air shutter, incrementally, to a more
closed position until the proper flame
appearance is achieved.
4. Leave the control knob (off/pilot/on) in the
ON position and the burner OFF/ON switch
OFF (and remote switches, if applicable).
5. When satisfied that the burner flame ap-
pearance is normal, close the lower control
compartment door.
WarninG: air shutter adjust-
ment should only be performed by
a qualified professional service
technician.
WarninG: ensure front glass
panel is in place and sealed during
adjustment.
caution: the air shutter door and
nearby appliance surfaces are hot.
exercise caution to avoid injury while
adjusting flame appearance.
caution: carbon will be pro-
duced if the air shutter is closed
too much. any damage due to
carboning resulting from improp-
erly setting the air shutter is not
covered under the warranty.
Burner air shutter adjustment
adjustment set-screw
adjustment
rod up
(closed min.
Burner
position)
tube
air shutter
ref. air shutter patent:
adjustment rod down
(fully open air opening u.s. pat. 5,553,603
position)
Main Burner Factory air shutter
opening setting - inches (millimeter)
Model natural
Gas
1/32"
MLdVt-30
(0.795 mm)
1/32"
MLdVt-35
(0.795 mm)
1/32"
MLdVt-40
(0.795 mm)
1/32"
MLdVt-45
(0.795 mm)
Figure 12

Millivolt appliance checkout

The pilot flame should be steady, not lifting
or floating. Flame should be blue in color with
traces of orange at the outer edge.
The top 3/8" (10 mm) at the pilot generator
(thermopile) and the top 1/8" minimum (tip)
of the quick drop out thermocouple should be
engulfed in the pilot flame. The flame should
project 1" (25 mm) beyond the hood at all three
ports. See Figure 13.
To light the burner, refer to the lighting instruc-
tions on page 18.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
sit MiLLiVoLt piLot asseMBLY
proper pilot Flame appearance
thermocouple
pilot
nozzels
Figure 13

electronic appliance checkout

To light the burner, refer to the lighting instruc-
tions on page 20. Ensure the igniter lights the
pilot. The pilot flame should engulf the flame
sensor as shown in Figure 14.
eLectronic piLot asseMBLY
eLectronic
propane
sensor
Gas
1/8"
igniter
(3.2 mm)
1/8"
(3.2 mm)
1/4"
(6.4 mm)
3/16"
(4.8 mm)
Note: If the igniter is damaged, a
replacement kit is available, order
Catalog Number 87L54.
Figure 14

WarrantY

Your gas appliance is covered by a limited
twenty year warranty. You will find a copy
of the warranty accompanying this manual.
Please read the warranty to be familiar with
its coverage.
Retain this manual. File it with your other
documents for future reference.
igniter rod
Hood
3/8" Min.
(9 mm)
thermopile
pilot
Hood
13