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Page Title: Cleaning and Inspection.
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c.   Cleaning   and   Inspection.   Wipe  off  any  ac- cumulation   of   dust   and   test   as   described   below. ( 1 ) Test for continuity between contacts 1 and 2  and  also  between  contacts  3  and  4.  Contacts should  open  on  temperature  rise  at  150°F   + 5 %F and  close  on  temperature  drop  at  110°F  +  10  %F. (2)   Replace   switch   if   it   fails   to   meet   test requirements. d.  Installation.  Refer   to   figure   4-9   and   install heater  thermostatic  switch. ( 1 ) Refer to wiring diagram and connect leads (6)  to  switch  (7)  with  screw  (5). (  2  )  Attach  switch  to  bracket  (4)  with  screws (2)   and   lock   washers   (3). (  3  )  Secure  bracket  to  center  cover  with  two screws (1 ), (4)   Refer   to   paragraph   4-21   and   install housing   front   cover. 4-35.   Heater   Elements a.  General.  The  single  phase  air  conditioners  are equipped   with   four   heater   elements   and   the   three phase  air  conditioners  are  equipped  with  six  heater elernents.  The  115  volt  single  phase  and  230  volt single   phase   heating   elements   are   the   same   but pairs   of   the   elements   are   connected   in   parallel circuits  on  the  115  volt  units  and  in  series  in  the 230   volt   units. b.   Removal.   Refer   to   figure   4-10   and   remove heater   elements   as   follows: (   1   )   Refer   to   paragraph   4-21   and   remove housing   cover. (2)   Disconnect   leads   from   heaters. (3)  Remove  two  screws,  washers,  and  lock washers that secure heater support to housing. Slide support   from   ends   of   heater   elements. (4)   Remove   heater   element   nut,   lock   washer and  flat  washer  from  each  heater  in  turn  and  slide heater   from   bracket. 4-18

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