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Page Title: Section X. MAINTENANCE OF ELECTRICAL SYSTEM
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Figure  4-9.  Heater  thermostatic  switch,  exploded  view.
opening   in   housing.   Install   outer   nuts   and   insert ends   of   wire   core   into   mechanical   posts   of   damper and   actuator.   Tighten   outer   nuts   on   casing. (2)   Install   clamp,   spacer,   screw,   nut,   and washer. (3)   Refer   to   paragraph   4-27   and   adjust   the control. ( 4 )    R e f e r    t o    p a r a g r a p h    4 - 2 1    a n d    i n s t a ll housing   covers. ( 5 )    R e f e r    t o    p a r a g r a p h    4 - 1 8    a n d    i n s t a ll evaporator   inlet   and   outlet   louvers. Section   X. MAINTENANCE    OF    ELECTRICAL    SYSTEM 4-31.   General The   electrical   system   consists   of   the   evaporator   and condenser   fan   motors,   electric   heaters   and   heater thermostatic   switch,   junction   box,   control   module, transformer,   rectifier,   condenser   fan   motor,   high- low   speed   thermostatic   switch   and   connecting harnesses   and   wiring.   Single   phase   air   conditioners are   equipped   with   motor   capacitors   and   a   com- pressor   start   relay.   Three   phase   air   conditioners   are equipped   with   phase   sequence   relays.   Electrical assemblies   and   groups   of   associated   components are   covered   in   separate   sections. Warning:   Disconnect   air   conditioner   power s u p p l y    b e f o r e    p e r f o r m i n g    m a i n t e n a n c e    w o rk on   electrical   system. 4-32.   Testing   and   Inspecting   the   Electrical System Troubleshooting   procedures   for   testing   the   elec- trical  system  to  isolate  cause  of  trouble  are  covered in   paragraph   4-12.   Additional   detailed   test   in- formation   is   contained   in specific    paragraphs covering   the   electrical   components.   Use   a   con- tinuity   tester   or   multimeter   set   on   low   ohms   range to   test   for   continuity.   Use   an   insulation   tester   or multimeter   set   on   higher   ohm   range   to   test   for shorts   between   the   circuit   in   a   component   and   the outside   case   of   the   component.   When   testing   air electrical   component,   check   also   for   visual   damage and   inspect   all   wiring   in   the   area   for   damage   or loose   connections. 4-33.  Wiring   Harnesses   and   Leads a.  G e n e r a l .   The   electrical   circuits   in   the   air conditioner   are   completed   by   individual   wire   leads or  by  wire  leads  laced  or  enclosed  in  a  loom  to  form a   wiring   harness.    All   of   the   wiring   carries   code numbers.   When   testing,   repairing   or   replacing   the wiring   harness   or   individual   wires,   refer   to   the wiring    diagrams. b.  Inspection.   Inspect   all   wiring   installation   for cracked   or   frayed   insulation   material.   Pay   par- ticular  attention  to  wires  passing  through  holes  in the   frame   or   around   sharp   edges.   Repair   or   replace defective   wiring.   Inspect   electrical   connectors   and fittings   for   damage   or   broken   condition.   Replace defective   connectors   and   fittings. c.  Testing.  Test   for   continuity   in   leads   or   wiring harnesses  by  disconnecting  each  end.  Where  wires terminate   in   an   electrical   connector,   disconnect connector   from   corresponding   receptacle   connector or   plug   connector.    Touch   the   test   probes   of   a continuity   tester   or   multimeter   set   on   low   ohms range   to   ends   of   wire   or   corresponding   pin   of connector.  If  continuity  is  not  indicated,  repair  or replace   wire. d.  Repair.   Remove   insulation   to   expose   1/2   inch of  bare  wire  on  each  side  of  break.  Twist  the  wire ends  together  and  solder  the  splice.  Cover  the  splice with  rubber  or  PVC  electrical  tape  and  friction  tape making   certain   to   cover   all   the   repaired   area. Replace   broken   terminal   lugs   with   exact   duplicates. To   replace   electrical   connectors,   unsolder   wires from   solder   wells and   insert   ends   of in   place.   Check wiring   diagram. to   inserts.   Install   new   connector wires   in   solder   wells.   Solder   wires connections   carefully.   Refer   to Section  Xl. MAINTENANCE   OF   HEATERS   AND   THERMOSTATIC   SWITCH 4-34.   Heater   Thermostatic   Switch (1)  R e f e r    t o    p a r a g r a p h    4 - 2 1    a n d    r e m o ve a.   General.  The   heater   thermostatic   switch housing   front   cover. mounted   in   a   bracket   under   the   housing   center (2)  Refer  to  figure  4-9  and  remove  two  screws cover,   protects   the   air   conditioner   from   overheating (1)   to   remove   bracket   and   switch   from   center   cover. if  the  heating  element  circuit  is  actuated  and  the  air (3)   Remove   two   screws   (2)   and   lock   washers flow  is  restricted  or  stopped. (3)   and   remove   bracket   (4). b.  Removal.  Remove   the   switch   as   follows: (4)   Remove   switch   screws   (5)   and   disconnect leads   (6)   from   thermostatic   switch   (7). 4-16

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