Service Manual

SiUS071735E Control Specification
Functions and Control 34
2.5 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.
Details
Frequency control in each zone
Stop zone
 After the input current remains in the stop zone for 2.5 seconds, 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).
09/12 class 15 class 18 class 24 class
Cooling Heating Cooling Heating Cooling Heating Cooling Heating
A (A) 12 12 12 12.5 18
B (A) 7 7.5 8 10 10.75 12 11.5
C (A) 6 6.5 7 9 9.75 11 10.5
Compressor Stop
Input current
Dropping zone
Stop zone
Keep zone
Reset zone
(R23249)
A
(A)
B
C