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 TM 9-4120-425-14&P
HEATER SUBASSEMBLY UNIT MAINTENANCE - Continued
0028-00
INSPECTION
Heater Elements and Electrical Wiring
1.
Inspect for damage to elements (3) or leads (1 and 2).
2.
Check heater element for continuity.
3.
Replace damaged leads and bad elements.
Heater Support Brackets (7, 10 and 29)
1.
Inspect for warping or cracking.
2.
Replace as necessary.
Terminal Board (TB4)
1.
Inspect TB4(17) for corrosion or damage.
2.
Replace as necessary.
TEST
1.
Test heater elements (3) by checking for continuity between the two electrical leads (1 and 2) of each heater
element. Refer to schematic diagram WP 0122-00. Test can be performed at terminal board TB(17). If continuity
does not exist, replace element.
2.
Test heater cutout switches. See WP 0027-00.
REMOVAL
1.
Tag and disconnect input power leads from terminal board TB4(17).
2.
Remove six screws (8) and six lockwashers (9) securing heater support bracket (10) to housing.
3.
Gently pull up and out the heater subassembly from housing.
4.
For each heater element (3), remove nut (11), lockwasher (12), flat washer (13), and insulator (14) securing heater
element (3) to heater support bracket (10).
5.
Slide each heating element (3) from heater support bracket (10) and heating angle bracket (7).
NOTE
Do not remove tags from heater element wire.
6.
Remove two screws (15) securing terminal board TB4(17) to bracket (10).
7.
Remove terminal board TB4 from bracket (10).
0028-00-2
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