Control Specification SiMT041509E
37 Function and Control
3.5 Input Current Control
Outline The microcomputer calculates the input current while the compressor is running, and sets the
frequency upper limit based on the input current.
In case of heat pump models, this control is the upper limit control of frequency and takes
priority over the lower limit control of four way valve operation compensation.
Detail
Frequency control in each zone
Stop zone
After 2.5 seconds in this zone, the compressor is stopped.
Dropping zone
The upper limit of the compressor frequency is defined as operation frequency – 2 Hz.
After this, the output frequency is lowered by 2 Hz every second until it reaches the keep
zone.
Keep zone
The present maximum frequency goes on.
Reset zone
Limit of the frequency is canceled.
Limitation of current dropping and stop value according to the outdoor temperature
The current drops when outdoor temperature becomes higher than a certain level
(depending on the model).
18 class 24 class 28 class
Cooling Heating Cooling Heating Cooling Heating
A (A)18.018.018.0
B (A) 9.5 7.5 12.0 8.5 14.5 9.5
C (A) 8.5 6.5 11.0 7.5 13.5 8.5
Compressor Stop
Input current
Dropping Zone
Stop Zone
Keep Zone
Reset Zone
(R14643)
A
(A)
B
C
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