Control Specification
SiBE061121
36
Function and Control
3.5
Input Current Control
Outline
The microcomputer calculates the input current during the compressor is running, and sets the
frequency upper limit from the input current.
In case of heat pump model, this control which is the upper limit control of the frequency takes
priority to 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 pulled down 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).
25 class
35 class
50 class
Cooling
Heating
Cooling
Heating
Cooling
Heating
A
(A)
9.25
9.25
20.0
B
(A)
6.25
7.5
8.25
10.0
15.0
C
(A)
5.5
6.75
7.5
9.0
14.0
Compressor Stop
Input current
Dropping Zone
Stop Zone
Keep Zone
Reset Zone
(R14643)
A
(A)
B
C
SiBE061121.book Page 36 Monday, April 25, 2011 3:20 PM
