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TM 9-4120-389-14
(4) See tags and wiring diagram (FO-1) and reconnect leads of heater elements showing continuity
to TB2.
c. Heater Removal
(1) Cut ties as needed.
(2) Disconnect wire leads from TB2.
(3) Remove two screws, washers and lockwashers from heater support.
(4) Separate the heater support from the six installed heating elements.
(5) Using wrench, remove mounting nut, flat washer and lockwasher (supplied with element) of the
defective element.
(6) Remove defective heater element from casing.
d. Installation
(1) Remove nut, flat washer and lockwasher from replacement heater element.
(2) Thread two wire leads through element mounting hole in casing.
(3) Install heater element in mounting hole in casing.
(4) Loosely install washer, lockwasher and nut on replacement heater element.
(5) Install the heater support on six heater elements.
NOTE
It may be necessary to loosen nuts on all elements in order to more easily install heater support.
(6) Align two mounting holes in heater support with mounting hardware in casing.
(7) Secure heater support to casing with two screws, lockwashers and flat washers.
(8) Using wrench, tighten nuts on heater elements.
(9) See wiring diagram (FO-1) and connect wire leads.
(10) Install ties as needed.
Follow-on procedures:
Install junction box (See para. 4-46).
Install top cover (See para. 4-14).
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