Daikin FTX09NMVJU Service Manual page 32

Main Functions
The following drawing shows a schematic view of the inverter principle:
Inverter Features The inverter provides the following features:
Frequency Limits The following functions regulate the minimum and maximum frequency:
Low
High
Forced Cooling Refer to page 115 for details.
Operation
21
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 rotation speed of the compressor 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 (35.6 °F).
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 44.
Compressor protection function. Refer to page 44.
Discharge pipe temperature control. Refer to page 45.
Input current control. Refer to page 46.
Freeze-up protection control. Refer to page 47.
Heating peak-cut control. Refer to page 47.
Defrost control. Refer to page 49.
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
SiUS091601E
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
(R2812)
Functions and Control