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SYSTEM HAC-235 < SYSTEM DESCRIPTION > [AUTO A/C (WITHOUT HEAT PUMP)] C D E F G H J K L M A B HAC N O P AIR DISTRIBUTION AUTOMATIC AIR CONDITIONING SYSTEM : PTC Heater Control INFOID:0000000010121949 DESCRIPTION • Based on the air mix door position and signals input from each sensor, the A/C auto amp. calculates the PTC heater outlet air temperature. • A/C auto amp. calculates the PTC heater operating rate so that the calculated PTC heater outlet air temper- ature is achieved, and transmits the PTC heater operating rate request signal to the PTC heater via LIN communication. • Based on the A/C auto amplifier command, the control circuit inside the PTC heater controls the PTC heater output by the PWM method. NOTE: MODE switch * VENT — — — B/L FOOT D/F DEF switch ON Intake switch * REC — — — — FRE Temperature control Full cold 16.0 °C — 16.5 °C – 29.5°C AUTO AUTO Full hot 30.0 °C ON/OFF switch OFF Fixed at the position where the ON/ OFF switch is pressed — — Switch position Door position Mode door In ta ke do or Air mix door Cen ter ve nt ila to r/ de fr os te r do or Sub - de fr ost er do or Si de v en til at or do or Fo ot doo r Up pe r a ir m ix do or Lowe r a ir m ix do or Discharge air flow MODE/DEF setting potion Air outlet/distribution (Approx.) Ventilator Foot Defroster Center Side Front Rear 50% 50% — — — 30% 30% 28% 12% — — 15% 45% 20% 20% — 15% 32% 13% 40% — 15% — — 85% |