Service Manual

Control Specification SiUS091133

47 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 from the input current.

In case of heat pump models, this control which is the upper limit control of the frequency takes

priority over the lower limit of 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).

09 class 12 class 15/18 class

Cooling Heating Cooling Heating Cooling Heating

A (A) 9.25 9.25 15.0 15.25

B (A) 6.25 7.5 8.25 13.0 13.25

C(A) 5.5 6.75 7.5 12.0 12.25

24 class 30/36 class

Cooling Heating Cooling Heating

A (A) 20.0 20.0

B (A) 15.0 17.0 19.0

C(A) 14.0 16.0 18.0

Compressor Stop

Input current

Dropping Zone

Stop Zone

Keep Zone

Reset Zone

(R14643)

(A)