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Page Title: Figure 6-7. Time delay relay test points.
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TM 5-4120-270-15 Figure 6-7.  Time delay relay test points. and    4.0    amperes.        On    model    MAC6V60-360-2    the ammeter should indicate between 4.5 and 3.14 amperes at full load.  When testing the condenser fan motor, the ammeter should indicate between 18 and 12.6 amperes at   full   load   for   model   MAC4V60-360-.      On      model MAC6V60-36-2   the   ammeter   should   indicate   between 14.5 and 10.2 amperes at full load. c.  Removal.  Refer to paragraphs 6-21 and 5-33 and remove fan motors. d.    Disassembly.    Refer  to  figure  6-8  and  6-9  and disassemble the fan motors. e.    Testing  of  Overload  Protector.      Disconnect   the electrical  leads  from  the  overload  protector.    Test   the protector  with  a  multimeter  set  on  OHMS.    If  continuity does not exist, replace the overload protector. f.  Cleaning, Inspection and Repair. (1)  Clean  all  parts  with  a  cloth  dampened  in cleaning solvent. (2)    Inspect    the    stator    housing    for    cracks, breaks,    or    other    defects.        Replace    a    damaged    or defective housing. (3)   Inspect   bearings   for   pits,   scoring,   wear, and out-of-round.  Replace worn or defective bearings. (4)    Inspect    the    rotor    shaft    for    cracks,    wear,    and misalinement.  Replace a damaged or defective rotor. (5)  Inspect  the  rotor  for  cracks,  breaks,  and damaged  laminations.    Replace  the  rotor  and  stator  if they are damaged. (6)   Inspect   all   threaded   parts   for   damage. Replace as necessary. g.    Reassembly.      Refer   to   figure   6-8   and   6-9   and reassemble the fan motors. h.    Installation.    Refer  to  paragraphs  5-21  and  5-33 and install the fan motors. 6-10.  Electric Heater Elements a.    General.    Two  banks  of  three  electrical  heaters each are mounted directly behind the evaporator coil, in the     conditioned     air     stream,     and     provide     heat     on command   from   the   temperature   control   thermostat   to maintain the selected ambient temperature.  Placing the selector    switch    on    "LO-HEAT"    starts    the    evaporator blower  and  places  one  bank  of  heaters  in  operation  on command    from    the    temperature    control    thermostat. Placing  the  selector  switch  in  "HI-HEAT"  activates  the second  bank  of  heaters,  which  operates  continuously  in addition to the controlled bank. b.      Removal.      Refer   to   figure   53   and   remove   the heating element assembly from air conditioner. c.      Disassembly.      Refer   to   figure   53.      Disconnect electrical    leads    from    heating    elements    and    remove elements from support channel assembly. d.    Testing.    Using  a  multimeter  set  on  low  OHMS range, check resistance across each heating element in turn.    Normal  reading  is  7  ±  4  ohms.    Replace  heating element if resistance is not as specified. e.  Reassembly.  Refer to figure 5-3.  Install elements in support channel assembly and connect electrical leads. f.  Installation.  Refer to figure 5-3 and install heating element assembly in air conditioner. 6-11.  Heater High Temperature Cutout a.  General.  The heater high temperature cutout is a three-pole, single-throw, automatic reset thermal overload  and  overcurrent  protector  which  prevents  the heaters   from   operating   at   discharge   temperatures   in excess of 190° ± 40°F regardless of selector switch and temperature control thermostat settings.  Normal heater operation    resumes    automatically    at    140°    ±    40°F discharge air temperature. Note.        Normally,    cutout    temperature    will    be reached   only   if   evaporator   fan   motor   stops   due   to malfunction or if blowers are damaged or seized . 6-8

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