TM-9-2540-207-14-P
HEATER, VEHICULAR COMPARTMENT, MODEL: A20
TECHNICAL MANUAL; OPERATOR, FIELD, AND SUSTAINMENT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
JULY 2007
TM-9-2540-207-14-P - Page 12 of 288
TM 9-2540-207-14&P
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LIST OF FIGURES
Figure 1.1-1. A20 heater.
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1-1
Figure 1.3-1. A20 heater, General Dimensions .
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1-6
Figure 1.4-1. Shipping Container.
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1-6
Figure 2.1-1.
Single Air Configuration.
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2-1
Figure 2.4-1.
Mounting Strap Locations.
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2-2
Figure 2.5-1.
Hunter A20 heater .
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2-3
Figure 2.7-1.
Ventilation Air Duct.
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2-5
Figure 3.1-1.
Approved Control Boxes.
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3-1
Figure 3.3-1.
Diagnostic Display, Segment Steps .
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3-2
Figure 3.3-2. Operating Modes.
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3-2
Figure 3.7-1. Data Codes.
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3-3
Figure 3.7-2.
Data Codes Mode Example.
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3-4
Figure 3.8-1.
Warning Faults .
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3-5
Figure 3.8-2.
Shut Down Faults .
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3-5
Figure 4.4-1.
Ignitor & Ignitor Holder Inspection .
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4-5
Figure 5.2-1 A20 Control Cover.
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5-2
Figure 5.2-2 Design Iteration #1 .
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5-3
Figure 5.2-3 Design Iteration #2 .
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5-4
Figure 5.2-4 Design Iteration #3 .
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5-5
Figure 5.3-1 heater, Major Assemblies.
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5-6
Figure 5.4-1 Shell Assembly.
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5-8
Figure 5.4-2 Top Cover.
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5-9
Figure 5.4-3 Top Shell .
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5-10
Figure 5.4-4
Bottom Shell .
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5-12
Figure 5.6-1 Vent Fan Assembly .
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5-14
Figure 5.6-2 Vent Fan Assembly .
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5-15
Figure 5.6-3 Bolt Removal Detail, Vent Fan Assembly.
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5-16
Figure 5.6-4 Vent Fan Assembly .
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5-18
Figure 5.6-5 Vent Fan Assembly .
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5-19
Figure 5.6-6 Vent Fan Assembly .
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5-20
Figure 5.6-7
Bolt Removal Detail, Vent Fan Assembly.
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5-20
Figure 5.6-8 Combustion Air Duct and Inlet Sealant Application.
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5-21
Figure 5.6-9 Motor Magnet .
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5-23
Figure 5.6-10 Motor Magnet Removal .
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5-25
Figure 5.6-11 Motor Magnet Installation .
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5-26
Figure 5.6-12 Vent Fan Shroud .
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5-27
Figure 5.6-13 Vent Fan Impeller .
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5-29
Figure 5.6-14 Detail, Vent Fan Impeller Orientation .
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5-30
Figure 5.6-15 Detail, Vent Fan Impeller Assembly .
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5-31
Figure 5.6-16 Electronic Programmed Controller & Vent Fan Driver Boards .
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5-32
Figure 5.6-17 Detail, Removal of Printed Circuit Boards .
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5-33
Figure 5.6-18 Detail, Screw Locations.
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5-34
Figure 5.6-19
Detail, Circuit Board Brackets Requiring Heat-Sink Compound.
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5-35
Figure 5.6-20 Vent Fan Driver Board.
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5-36
Figure 5.6-21
Detail, Removal of Printed Circuit Board Connector .
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5-37
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