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Filter-Dehydrator - TM-5-4210-230-14P-1_274
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BODIES AND CABS Vehicles    with    air    conditioning    have    a    powerful permanent  magnet  type  blower  motor  which  utilizes  a  vent tube for efficient motor cooling.  On vehicles with heater only, a smaller permanent magnet type motor is used. A   resistor   assembly   is   used   in   the   blower   motor circuit to provide three speed settings, "LOW", "MEDIUM" and "HIGH".  The resistors are located in the blower air stream to prevent overheating. On vehicles with air conditioning, a high speed relay is   used   to   accommodate   the   high   current   demand   of   the larger blower motor.  This avoids a high current flow through the  switch  during  high  speed  operation.    When  the  blower  is operated  on  "LOW"  or  "MEDIUM"  speed,  current  flows  from terminal  "2"  of  the  resistor  assembly  to  terminal  12"  of  the relay  and  out  through  terminal  "1"  of  the  relay  to  the  motor. When  the  switch  is  turned  to  "HIGH",  relay  terminal  "4"  is energized,  allowing  current  to  flow  from  a  30  amp  fuse  to terminal  "3"  of  the  relay  and  out  through  terminal  "1"  to  the motor.  (See wiring circuit diagram, Fig.  17.) Refrigerant Compressor The  compressor  (Fig.    6)  is  a  two-cylinder  recipro- cating type unit.  It is mounted on the engine and belt driven through an electromagnetic clutch mounted on the compressor   crankshaft.      The   compressor   compresses   and superheats  refrigerant  gas  received  from  the  evaporator  and propels the refrigerant through the system. Fig.  6  Refrigerant Compressor Magnetic Clutch The   electro-magnetic   clutch   (Fig.      7)   is   used   to couple and uncouple the compressor from the V-belt drive.  It cycles  the  compressor  "ON"  or  "OFF"  in  response  to  signals from   the   thermostatic   temperature   control   switch.      When thermostatic  switch  demands  cooling,  the  clutch  is  engaged setting    the    compressor    in    motion.        When    cab    interior temperature satisfies thermostatic switch, the clutch field coil is   de-energized   releasing   clutch   plate   from   pulley,   ceasing compressor    operation.        Use    of    a    cycling    clutch    system reduces engine load, maximizes compressor life and enhances fuel economy. Fig.  7   Magnetic Clutch Fig.  8   Refrigerant Condenser Condenser The refrigerant condenser (Fig.  8) is mounted at the front  of  the  vehicle  between  engine  cooling  system  radiator and grille.  As refrigerant passes through the condenser, heat that was picked up in the evaporator and during compression is  given  up  to  the  cooler  air  flowing  through  the  condenser fins.    Refrigerant  condenses  from  a  high  pressure  gas  to  a high pressure liquid. CTS-2731   Page 6 PRINTED IN UNITED STATES OF AMERICA

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