Item
5. Capacity
control
Operation flow and applicable data, etc.
The cooling capacity depending on the load is adjusted.
ture and the room temperature, the capacity is adjusted by
the compressor revolution.
Description
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 and the commuta-
tion timing are varied.
5) Change the compressor motor
speed by outputting power to the
compressor.
* The contents of control
operation are same in cooling
operation.
Set temp. (Ts)
Room temp. (Ta)
Correction of Hz signal
Detection of electromotive force
of compressor motor winding
Detection of motor speed and rotor position
In
verter output change
Commutation timing change
Change of compressor speed
Remote controller Indoor unit
Ts –Ta
Correction value of Hz signal ≤ Operating Hz
According to difference between the setup value of tempera-
6
2
A
J
K
I
(˚C)
6
Freeze preventive control
(Low temperature release)
1) The cooling operation (including Dry operation) is
performed as follows based on the detected
temperature of Tc sensor or Tcj sensor.
When [J] zone is detected for 6 minutes
(Following figure), the commanded frequency is
decreased from the real operation frequency.
After then the commanded frequency changes
every 30 seconds while operation is performed in
[J] zone.
In [K] zone, time counting is interrupted and the
operation is held.
When [ I ] zone is detected, the timer is cleared
and the operation returns to the normal operation.
If the commanded frequency becomes S0
because the operation continues in [J] zone, the
return temperature A is raised from 6°C to 12°C
until [ I ] zone is detected and the indoor fan
operates with [L] mode.
Tcj:
Indoor heat exchanger
sensor temperature
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