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Combination (Blend Air) Unit
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TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BODIES AND CABS Relative  positions  of  heater  core,  evaporator  core, blower  fan  and  motor  and  other  components  located  in  the combination unit are shown in Fig.  3.  These components are described in detail later in this .section. Control Panel Assembly Major   functions   of   the   heater   and   air   conditioning systems are controlled from the control panel assembly (Fig. 4).  The control panel has three levers (two levers on vehicles with heater only) and a blower switch. Fig.  4   Control Assembly The   top   (A/C)   lever   operates   the   air   conditioning thermostatic    control    switch    to    regulate    cab    cooling    (air conditioning).  The center lever (HTR) operates the hot water flow control valve and the blend door to regulate cab heating. The   lower   (AIR   CONTROL)   lever   divides   air   flow   between DEFROST and CAB AIR outlets. Separate controls (not in control panel) are provided for  operating  the  fresh  air  ventilation  system  and  the  driver and passenger floor heat dumps. The  three  speed  blower  switch  has  five  terminals. Feed  current  from  a  20  amp  fuse  enters  the  switch  through terminal "B".  Whenever switch lever is moved from the "OFF" position, current is provided through the terminal "A/C" to the thermostat control switch.  Terminals "L", "M" and "H" refer to low,  medium  and  high  speeds  and  are  energized  when  the switch  lever  is  moved  to  their  corresponding  positions.    On vehicles  with  heater  only,  the  "L",  "M"  and  "H"  terminals  are wired  to  the  resistor  terminals  "4",  "3"  and  "1"  respectively. On vehicles with air conditioning, the "H" terminal is wired to terminal   "4"   of   the   high   speed   relay.      (See   wiring   circuit diagrams, Figs.  16 and 17.) The  ventilation  system  is  controlled  by  rotating  the "VENT"  knob  located  just  to  the  left  of  the  center  instrument panel air outlets.  The driver floor heat dump is cable operated from a push-pull control located at the upper left hand corner of  the  instrument  panel.    The  passenger  floor  heat  dump  is operated by a hand lever located under the instrument panel. Heater Core The    heater    core    (Fig.        3)    is    mounted    in    the combination    unit    housing.        The    core    is    of    honeycomb construction.    Engine  coolant  is  circulated  through  the  core water passages and heat from the coolant is dissipated to air circulated through the core fins. Hot Water Flow Control Valve The hot water flow control valve regulates the flow of hot engine coolant through the heater core.  The control valve operates in conjunction with the blend door (Fig.  3). This arrangement is controlled through cable connected  to  the  second  (HTR)  lever  on  the  control  panel assembly.  In the "OFF" position, no coolant is allowed to flow through the heater core and the blend door is in the full open position,  bypassing  air  around  the  heater  core.    As  the  lever moves toward the maximum heat position, the flow of coolant through the core is increased and the air bypassing the core is reduced   until   at   maximum   lever   travel   (HOT)   all   air   flows through the core. Blower The   blower   fan   (Fig.      5)   provides   air   circulation through   the   heater   and   evaporator   cores   and   delivers   the treated air to the cab interior. Fig.  5  Air Blower and Resistor CTS-2731   Page 5 PRINTED IN UNITED STATES OF AMERICA

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