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Figure 3-13. switch   (S3)   contacts   will   open,   causing   relay (K4)   to   open   and   the   fan   speed   will   return   to L0-SPEED. (2)  Testing. (u)  With   power   off,   check   for   continuity between  A2  and  A3,  B2   and  B3,  and  D2  and   D3  of armature   relay   (K4).   Then   check   for   continuity between   C2   and  C3  and  D2   and   D3   of   armature relay  (K5).   If   continuity   is   not   indicated,   arma- ture   relay   is   defective   and   must   be   replaced.   If both  armature   relays   indicate   proper   continuity, proceed   to   next   test. (b)   Apply   208   volts,   60   Hertz,   3-phase   ac power  to  air  conditioner. (c)  place   rotary   switch   (S1)   in   VENT position  and  two-speed  switch  (S8)  in  HIGH. (d)   Check   voltage   between   terminals   X2 of   armature   relay   (K4)   and   ground   (El),   and terminal   X2   of   armature   relay   (K5)   and   ground (El).   30   (±3)   vdc   should   be   indicated,   or   relay 3-18

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