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Page Title: Section XVI. TRANSFORMER, RECTIFIER, AND PRESSURE SWITCHES
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KEY to fig. 4-20: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. Screw,  pan-hd,  10-32  x  5/8 Nut, hex, slflkg, 10-32 Washer, flat, no. 10 Compressor  motor  relay Heater relay Screw, fl-hd, 8-32 x 1/2 Nut, hex, slflkg, 6-32 Washer, flat, no. 6 (.156 ID) Bracket Condenser,  fan  relay Screw, fl-hd, 6-32 x 1/2 Nut, hex, slflkg, 6-32 Washer, flat, no. 6 (.156 ID) Washer, flat, no. 6 (.149 ID) Phase  sequence  relay Time delay relay. Circuit breaker d.  Phase  Sequence  Relay.  To  remove  the  phase sequence  relay  from  three  phase  units,  refer  to figure  4-20  and  remove  relay  as  follows: (1)  Remove  four  screws  (11),  nuts  (12)  and washers   (13). (2)   Remove   relay   (15)   and   two   each   of washers  (13  and  14). e.  Time  Delay  Relay.  To  remove  the  time  delay relay,  refer  to  figure  4-20  and  remove  relay  as follows  : (1) To remove time delay relay (16) from three phase units, remove the phase sequence relay then remove  two  remaining  screws  (11),  nut  (12),  and flat  washers  (13). (2)  To  remove  time  delay  relay  (18)  from single  phase  units,  remove  four  screws  (11),  nuts (12),  and  flat  washers  (13). f. Control Circuit Breaker.  To remove the control circuit  breaker  (17,  fig.  4-20),  remove  circuit breaker  nut  from  front  of  junction  box  and  pull breaker  to  the  rear  of  the  junction  box. 4-53.  Assembly a.  General.  Refer  to  figure  4-20  and  install  any components  that  were  removed.  After  installation of  components,  make  all  the  necessary  electrical connections. b. Control Circuit Breaker.  Install control circuit breaker  (17)  through  opening  in  junction  box  with locating  projection  in  opening  provided.  Install breaker  nut. c.  Time  Delay  Relay.  Install   time   delay   relay (16)  on  junction  box.  Secure  relay  to  single  phase junction  box  with  four  screws  (11),  nuts  (12),  and washers  (13).  For  three  phase  junction  boxes,  omit the  two  inner  sets  of  hardware. d.  Phase  Sequence  Relay.  To  install  the  phase sequence relay on three phase junction box proceed as   follows: (1)  Place  a  flat  washer  (14)  and  flat  washer (13)  over  outer  mounting  holes  of  phase  sequence relay. (2)  Install  phase  sequence  relay  (15)  on washers  and  mounting  flange  of  time  delay  relay. Install  four  screws  (11)  flat  washers  (13)  and  nuts (12). e.  Condenser  Fan  Relay.  Install   condenser   fan relay  (10)  on  bracket  (9)  and  secure  relay  with three nuts (7) and flat washers (8). Install bracket on junction box and install screws (6), nuts (7) and washers   (8). f.  Heater  and  Compressor  Motor  Relays.  Install heater  relay  (5)  or  compressor  motor  relay  (4)  and secure relay with four screws (1), nuts (2) and flat washers  (3). 4-54.  Installation a.  Making  any  electrical  connections  that  were disconnected  during  removal. b. Carefully install junction box into housing and install  seven  screws  and  lock  washers. c.  Refer  to  paragraph  4-48  and  install  control module. d.  Refer  to  paragraph  4-21  and  install  top  front cover. Section   XVI. TRANSFORMER,   RECTIFIER,   AND   PRESSURE   SWITCHES 4-55.  General The power transformer rectifier, reduces the power voltage   and   converts   the   alternating   current   to direct  current  to  operate  the  coils  and  switches  in the  control  circuit.  The  transformer  is  rated  at  a secondary voltage of 30 vac with a primary voltage of   115   vac.   The   transformer   and   rectifier   are located  below  the  junction  box.  The  high  and  low pressure cutout switches are also located below the junction   box   with   the   reset   buttons   extending through   the   front   of   the   housing.   The   pressure cutout  switches  are  connected  in  the  refrigeration system and are electrically connected in the control system to the compressor motor relay coil. Extreme high  or  low  pressure  opens  the  circuit  causing  the compressor  to  stop. 4-56.   Transformer a.  Testing.  Test  transformer  as  follows: (1)  Refer  to  paragraph  4-21  and  remove top  cover.  Refer  to  paragraph  4-50  and  partially remove   junction   box. (2)  Disconnect  leads  and  check  for  continuity across  the  primary  winding  and  then  across  the secondary  winding.    If  either  winding  is  open. replace  the  transformer. 4-33

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