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Item
Operation flow and applicable data, etc.
Description
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.
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
4. Release
protective
control by
temperature
of indoor
heat
exchanger
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 7°C to
12°C until [ I ] zone is detected and the indoor fan operates with [L]
mode.
Tcj:
Indoor heat exchanger
sensor temperature
Set temp. (Ts)
Remote controller
Indoor unit
Room temp. (Ta)
Ts –Ta
Correction of Hz signal
Detection of electromotive force
of compressor motor winding
Detection of motor speed and rotor position
Correction value of Hz signal
≤
Operating Hz
Inverter output change
Change of compressor speed
7
5
A
J
K
I
(˚C)
Summary of Contents for ras-m07g3dv-e
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