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CONTENTS (Continued)
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Combination (Blend Air) Unit
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BODIES AND CABS Fig. 1.  Comfort Control Heating and Air Conditioning System DESCRIPTION The  Comfort  Control,  blend  air  type  heater  or combination heater and air conditioner is used in the S- Series medium and medium heavy vehicles. In the combination system, both the heater core and  the  air  conditioning  evaporator  are  housed  in  the same  unit  and  utilize  the  same  air  ducts,  blower  and controls.    The  functions  of  each  system,  however,  are separate    and    different.        This    combination    system features compactness, convenience, good air distribution  and  service  accessibility.    All  components are  readily  accessible  for  service  resulting  in  care  of maintenance and low service costs. The  heater  and  air  conditioning  systems  have common     distribution     ducts     with     an     independently controlled ventilation system. Through control arrangement  and  common  ducting  of  treated  air,  the vehicle operator can select any degree of cab interior air temperature in a wide range of cab heating, defrosting, cooling (air conditioning), dehumidification and ventilation modes. All   of   the   air   treated   by   the   heater   and   air conditioning system comes into the unit through the air intake box.  The air intake box has three gravity closed recirculation     doors     as     well     as     fresh     air     supply connections to the fresh air chamber which is connected to the fresh air scoop. From   the   air   intake   box,   the   air   goes   to   the blower   and   is   "pushed"   through   the   evaporator   and heater cores.  In vehicles with A/C, a replaceable filter is placed  ahead  of  the  evaporator  to  prevent  plugging  of evaporator  with  lint  or  dirt.    Once  the  air  goes  through the  filter  and  evaporator  it  can  either  go  through  the heater   core   or   bypass   the   core   through   the   opened blend door.  (Hence the term "blend air".) Temperature control  is  achieved  through  the  blend  door  and  water valve  working  in  combination.    Both  the  water  and  the air   that   goes   through   the   heater   core   is   controlled, resulting  in  a  nearly  linear  temperature  response  and therefore the best possible cab comfort condition. Once the  air  leaves  the  unit,  it  has  been  filtered  and  either cooled,  dehumidified  or  heated  depending  on  operator need. From  the  heater/evaporator  unit,  air  enters  the duct   system   where   it   can   be   sent   to   the   defroster chamber,   various   register   outlets   or   the   floor   heat dumps. HEATER AND AIR CONDITIONING SYSTEM COMPONENTS The heater portion of the system employs basic components    of    any    automotive    hot    water    heating system.  These include: 1.  Heater Core. 2.  Hot Water Flow Control Valve. CTS-2731  Page 3 PRINTED IN UNITED STATES OF AMERICA

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