SiUS041829E
Control Specification
Part 4 Functions and Control
51
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 the 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
18 class
Cooling
Heating
Cooling
Heating
A
(A)
12
12
12.5
B
(A)
7
7.5
10
10.75
C
(A)
6
6.5
9
9.75
Compressor Stop
Inp
u
t c
u
rrent
Dropping zone
Stop zone
Keep zone
Reset zone
(R23249)
A
(A)
B
C
Summary of Contents for FTXR-T Series
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