Daikin FVKS25BVMB, Service Manual

Page: 47 / 184

Control Specification SiBE06-514A
38 Function and Control
3.5 Input Current Control
Outline The microcomputer calculates the input current during the compressor is running, and set the
frequency upper limit from such input current.
In case of heat pump model, this control is the upper limit control function of the frequency
which takes priority of the lower limit of four way valve activating compensation.
Detail
Frequency control in each zone
Drooping zone
Š
The maximum limit of the compressor frequency in this control is defined as operation
frequency – 2Hz.
Š
After this, the output frequency is pulled down by 2Hz every second until it reaches the
steady zone.
Keep zone
Š
The present maximum frequency goes on.
Reset zone
Š
Limit of the frequency is cancelled.
Stop zone
Š
After 2.5 s in this zone, the compressor is stopped.
Limitation of current drooping and stop value according to the outdoor air temperature
1. In case the operation mode is cooling
Š
The current droops when outdoor air temperature becomes higher than a certain level
(model by model).
2. In case the operation mode is heating (only for heat pump model)
Š
The current droops when outdoor air temperature becomes higher than a certain level
(model by model).
Compressor Stop
Drooping Zone
Stop Zone
Keep Zone
Reset Zone
I4
I3
I3 –I
α
(R4304)
Cooling Heating
25 class 35 class 25 class 35 class
I4 (A) 12 12
6.0 7.25 7.5 8.25 I3 (A)
5.25 6.5 6.75 7.5 I3-I
α
(A)