Lucent Technologies MPB-33 User Manual

Page 9

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Electronic Appliance Checkout

To light the burner, refer to the lighting instruc-
tions on Page

20 and 21. Ensure the igniter

lights the pilot. The pilot fl ame should engulf
the fl ame sensor as shown in Figure 9.

With proper care and maintenance, your appli-
ance will provide many years of enjoyment. If
you should experience any problem, fi rst refer
to the trouble shooting guide in this manual.
If problem persists, contact your Lennox
distributor.

SIT Millivolt Appliance Checkout

The pilot fl ame should be steady, not lifting
or fl oating. 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" min (tip) of the
quick drop out thermocouple should be engulfed
in the pilot fl ame. The fl ame should project 1"
(25 mm) beyond the hood at all three ports
(Figure 8).

To light the burner, refer to the lighting instruc-
tions on Pages 20 & 21.

Figure 9

Burner Adjustments

Note - The air shutter for the burner primary
air opening is factory-set. Do not adjust the
factory-set position. The factory-set position
is shown in Figure 7.

Figure 7

Burner Air Shutter Adjustment

3/8" to 1/2"

(9 -13 mm)

Ground

Electrode

Flame Rod

Hot Surface

Igniter

Proper Flame

Adjustment

Pilot
Nozzels

ELECTRONIC PILOT ASSEMBLY

Proper Pilot Flame Appearance

Figure 8

Thermocouple

Thermopile

Pilot
Nozzels

SIT MILLIVOLT PILOT ASSEMBLY

3/8" Min.

(9 mm)

Igniter Rod

Hood

Proper Pilot Flame Appearance

Main Burner Factory Air Shutter

Opening Setting - Inches (millimeter)

Model

Natural

Gas

Propane

Gas

MPB-3328

Fully Closed

3/16"

(4.76 mm)

MPB-3530

Fully Closed

3/16"

(4.76 mm)

MPB-4035

Fully Closed

3/16"

(4.76 mm)

MPB-4540

Fully Closed

3/16"

(4.76 mm)

Air Shutter

Venturi

Setscrew - Factory Located in the
Natural Gas Position; Relocate Set
Screw for LP/Propane Gas in the
Alternate Position. See Table for
Air Shutter Openings for these
Setscrew Locations.

Ref. Air shutter Patent:
U.S. Pat. 5,553,603