Daikin FTXN25KEV1B Service Manual page 21

SiBE041102_A
Drawing of The following drawing shows a schematic view of the inverter principle:
Inverter
Inverter Features The inverter provides the following features:
Frequency Limits The following functions regulate the minimum and maximum frequency:
Low
High
Refer to page
Forced Cooling
Operation
Function and Control
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
freq=
constant
The regulating capacity can be changed according to the changes in the outdoor
temperature and cooling / heating load.
Quick heating and quick cooling
The compressor rotational speed is increased when starting the heating (or cooling). This
enables to reach the set temperature quickly.
Even during extreme cold weather, high capacity is achieved. It is maintained even when the
outdoor temperature is 2°C.
Comfortable air conditioning
A fine adjustment is integrated to keep the room temperature constant.
Energy saving heating and cooling
Once the set temperature is reached, the energy saving operation enables to maintain the
room temperature at low power.
Frequency
Four way valve operation compensation. Refer to page 25.
Compressor protection function. Refer to page 26.
Discharge pipe temperature control. Refer to page 26.
Input current control. Refer to page 27.
Freeze-up protection control. Refer to page 28.
Heating peak-cut control. Refer to page 28.
Defrost control. Refer to page 30.
for detail.
138
Refrigerant circulation rate (high)
high speed
high f
low f
low speed
50 Hz
capacity=
freq=variable
60 Hz
variable
Refrigerant circulation rate (low)
Functions
Main Functions
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
(R2812)
11