TM 9-4120-402-14
4-44. ELECTRIC HEATER ELEMENTS (HR1 THROUGH HR6). - continued
b. Test.
(1) Tag and disconnect wire leads (2) from heater (1) being tested.
(2) Using multimeter, check continuity between the two terminal studs of heater (1). Replace heater if no
continuity is indicated.
(3) Using tags and wiring diagram figure 4-10 connect wire leads (2) to heater (1). Remove tags.
c. Replace.
(1) Tag and disconnect wire leads (2) from heater (1) being removed.
(2) Loosen captive screw (3) and remove clamp (4).
(3) Pull heater (1) free from lower mounting clip (5) and remove heater (1).
(4) Insert heater (1) into lower mounting clip (5).
(5) Secure top of heater (1) to heater support (6) with clamp (4). Tighten captive screw (3).
(6) Using tags and wiring diagram figure 4-10 connect wire leads (2) to heater (1). Remove tags.
(7) Heater support (6) replacement.
(a) Remove all six heaters (1).
(b) Remove four sets of screws (7), lock washers (8), and flat washers (9). Remove heater support (6).
(c) Secure heater support (6) to unit and thermostat bracket with four sets of screws (7), lock washers (8), and
flat washers (9).
(d) Install heaters (1).
(8) Lower mounting clip (5) replacement.
(a) Remove heater (1).
(b) Remove clip (5) from unit.
(c) Install clip (5) into unit.
NOTE
FOLLOW-ON MAINTENANCE:
Attach top panel (para 4-19).
Connect power at power source.
4-129
