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Page Title: ELECTRIC HEATER (ELEMENTS) (HR1 THROUGH HR6)
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TM5-4120-377-14 b.  Test.  With  thermostat  at  room  temperature,  use  a  multimeter  set  on  the  lowest  OHMS  scale  to  check  for continuity between each pair of contacts (4 and 6, 4 and 5, and 5 and 6). If continuity is not indicated between all  contacts,  replace  the  thermostat. NOTE For  full  operational  test  of  thermostat  use  an  external  heat  source.  Thermostat  should open  (no  continuity  across  contacts)  at  temperature  increase  of  194°F  ±  9°  (90°C  ±  5°) and  close  at  temperature  decrease  at  142°F  ±  16°  (61°C  ±  9°). c.   Installation (1)  If  bracket  was  removed,  use  screwdriver  and  secure  bracket  to  heater  support  with  two  screws,  lock washers,  and  flat  washers. (2)  Using  screwdriver  and  wrench,  secure  thermostat  to  bracket  with  two  screws  and  lock  nuts. (3)  See  tags  and  wiring  diagram  (fig.  4-20)  and  solder  wire  leads. (4)  Remove  tags. Follow-on  procedure:  Install  top  cover.  (See  para  4-28.) 4-61. ELECTRIC HEATER (ELEMENTS) (HR1 THROUGH HR6) Preliminary   procedure: Remove top panel. (See para 4-28.) TS4120-377-14/4-72 Figure  4-72.  Electric  Heater  (Elements)  (HR1  through  HR6) 4-113

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