TM 9-4120-404-14
(1) Remove cable ties as needed.
(2) Tag and disconnect all heating element wires from heater relay (K1) and terminal post.
WARNING
Evaporator fins are very sharp and can injure personnel. Use extreme care when
removing heating elements.
CAUTION
Bending evaporator fins will reduce unit's operating efficiency.
Use care when
removing heating elements to not bend evaporator coil fins.
NOTE
Remove top heating element first. Element removal sequence is HR6, HR5, HR4,
HR3, HR2, and then HR1.
(3) Remove nut (1), lock washer (2), flat washer (3), insulating washer (4), and carefully maneuver heating
element (5) from unit.
(4) Repeat step (3) for each heating element.
b. Test.
Each element should
indicate a resistance of 10 ohms 30%.
(2) If any element does not read correct resistance, the element must be replaced.
c. Installation.
WARNING
Evaporator fins are very sharp and can injure personnel. Use extreme care when
removing heating elements.
CAUTION
Bending evaporator fins will reduce unit's operating efficiency.
Use care when
removing heating elements to not bend evaporator coil fins.
(1) Install heating element (5), insulating washer (4), flat washer (3), lock washer (2), and nut (1) into unit.
(2) Repeat step (1) for other heating elements.
(3) Install heating element wires as tagged during removal and then remove tags.
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