Input Current Control - Daikin FTX-N Series Service Manual

Control Specification
5.5

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.
A (A)
B (A)
C (A)
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).
83
(A)
A
B
C
Input current
09 class
Cooling Heating Cooling
12
7.5 8.5 11.5
6.5 7.5 10.75
Compressor Stop
12 class 15 class
Heating Cooling
13 18
12 12
11.25 11
SiUS091601EA
Stop zone
Dropping zone
Keep zone
Reset zone
(R23249)
18/24 class
Heating Cooling Heating
20
12 16.25 18.25
11 15.25 17.25
Part 4 Functions and Control