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Page Title:
HEATER CUTOUT SWITCH S3 MAINTENANCE |
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 TM 9-4120-430-14
UNIT MAINTENANCE
AIR CONDITIONER, COMPACT, HORIZONTAL
HEATER CUTOUT SWITCH S3 MAINTENANCE
INSPECTION, REMOVAL, TEST, AND INSTALLATION
INITIAL SETUP:
Tools and Special Tools
Tool Kit, General Mechanics (Item 1, Table 2, WP 0067 00)
Test Equipment
References
Wire List and Schematic Diagram (WP 0038 00)
Personnel Required
One
Equipment Condition
Power disconnected form unit.
Top cover removed (WP 0018 00)
WARNING
Ensure power source is disconnected.
WARNING
Allow heating elements to cool for 15 minutes before touching.
INSPECTION
Inspect for wiring damage.
REMOVAL
1.
Verify wiring labels with wire list (WP 0038 00) and remove wire leads.
2.
Remove screw (1), lockwasher (2), and flat washer (3) that secure the thermostatic switch bracket (4) to the
evaporator coil top rail.
3.
Detach and lift the thermostatic switch bracket (4) from the evaporator coil top rail.
4.
Take out two screws (5) and lockwashers (6) to remove the high voltage heater cutout switch S3 (7) from the
thermostatic switch bracket (4). See figure 1.
TEST
1.
Using a multimeter on the lowest possible setting, test for continuity between contacts 1 and 2 and between contacts
3 and 4 on switch S3. See schematic diagram, WP 0038 00.
2.
Replace if defective.
0034 00-1
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