HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A–101
according to the outside air temperature or the specified
interior temperature. This function removes the
difference in the blowing temperature in this state and
that of when the compressor is turned on.
When FH or FC is selected for the setup temperature,
the air mix door is accordingly fixed to the Full Heat or
Full Cool mode.
When the VENT mode is selected, aperture of the air
mix door is controlled so that excessively heated air may
not be blown from the VENT blow port.
C01RY00015
Air Flow Control
In the Auto Mode
• The automatic heater/air conditioner control unit
operates on the setup temperature signal and other
sensor signals to derive the total signal. Then, the
control unit adjusts base potential of the power
transistor to match it to the voltage pattern of the
target fan so that stage-less fan speed control can be
achieved.
When solar radiation quantity is detected in the VENT
or B/L mode, the control unit increases the minimum
fan voltage to offset.
When FH or FC is selected from the temperature
control switch, air flow is accordingly fixed to MAX HI
or AUTO HI.
In the Manual Mode
• Air flow specified from the fan switch is entered to the
automatic heater/air conditioner control unit as the
manual signal. The signal modifies the air flow to the
level specified from the fan switch so that the required
fan voltage is attained.
C01RY00008
Mode (Blow Port) Control
The automatic heater/air conditioner control unit
operates on the setup temperature from the control
switch, and temperature and solar radiation quantify
from the sensors to determine the total mode control
signal. According to the pattern specified by this signal,
the control unit selects either one of the VENT,
BI-LEVEL, FOOT or DEF/FOOT mode.
The mode actuator determines the rotation direction
comparing the target position against the current
position being determined by the position detection
signal.
When FH or FC is selected for the temperature from the
temperature control switch, mode is accordingly fixed to
the VENT or FOOT.
• In the manual operation of the mode switch, you can
select a desired blow port mode pressing the
corresponding mode switch.