Daikin FTXL20G2V1B Service Manual page 35

SiENBE04-925_A
Drawing of
The following drawing shows a schematic view of the inverter principle:
Inverter
Inverter Features The inverter provides the following features:
„ The regulating capacity can be changed according to the changes in the outdoor
„ Quick heating and quick cooling
„ Even during extreme cold weather, the high capacity is achieved. It is maintained even when
„ Comfortable air conditioning
„ Energy saving heating and cooling
Frequency Limits
The following functions regulate the minimum and maximum frequency:
Low
High
Forced Cooling
Refer to "Forced operation mode" on page
Operation
Function and Control
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
freq=
constant
temperature and cooling / heating load.
The compressor rotational speed is increased when starting the heating (or cooling). This
enables to reach the set temperature quickly.
the outdoor temperature is 2°C.
A fine adjustment is integrated to keep the room temperature constant.
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 38.
„ Compressor protection function. Refer to page 38.
„ Discharge pipe temperature control. Refer to page 39.
„ Input current control. Refer to page 40.
„ Freeze-up protection control. Refer to page 41.
„ Heating peak-cut control. Refer to page 41.
„ Defrost control. Refer to page 43.
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
48 for detail.
Main Functions
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
(R2812)
21