– 32 –
Item
2. Indoor fan
motor
control
(continued)
Cool air discharge preventive control
1) In heating operation, the indoor fan is controlled based on the detected
temperature of Tc sensor or Tcj sensor. As shown below, the upper limit of
the fan speed is restricted.
However B zone is assumed as C zone for 6 minutes after compressor was
activated. In defrost operation, the control value of Tc is shifted up by 6˚C.
Tc
Tcj
(˚C)
32
30
28
26
20
16
HH
H
L
LL
OFF
E zone
D zone
C zone
B zone
A zone
In D and E zones, the
priority is given to air
volume selection setup
of remote controller.
In A zone while thermo
is ON, [PRE-HEAT
(Heating ready)] is
displayed.
Tcj:
Indoor heat exchanger
sensor temperature
Operation flow and applicable data, etc.
De
s
cription
3. Capacity
control
The cooling or heating capacity depending on the load is adjusted.
According to difference between the setup value of temperature and the room
temperature, the capacity is adjusted by the compressor revolution.
Remote controller
Indoor unit
S
et temp. (Ts)
Room temp. (Ta)
1) The difference between
set temperature on
remote controller (Ts)
and room temperature
(Ta) is calculated.
2) According to the
temperature difference,
the correction value of
Hz signal which
determines the
compressor speed is
set up.
3) The rotating position
and speed of the
motor are detected by
the electromotive force
occurred on the motor
winding with operation
of the compressor.
4) According to the
difference resulted
from comparison of
the correction value of
Hz signal with the
present operation Hz,
the inverter output is
varied.
5) Change the compressor
motor speed by
outputting power to the
compressor.
* The contents of
control operation are
same in cooling
operation and
heating operation
Correction of Hz signal
Detection of motor speed and rotor position
Detection of electromotive force
of compressor motor winding
Ts – Ta
Correction value of Hz signal . Operating Hz
Inverter output change
Change of compressor speed
