Daikin SUPER MULTI NX CTXS07JVJU Service Manual page 44

SiUS12-928_B
Inverter Principle
To regulate the capacity, a frequency control is needed. The inverter makes it possible to alter the
rotation speed of the compressor. The following table explains the conversion principle:
Phase
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 temperature
 Quick heating and quick cooling
 Even during extremely cold weather, high capacity is achieved. It is maintained even when the
 Comfortable air conditioning
 Energy saving heating and cooling
Function and Control
1 The supplied AC power source is converted into the DC power source for the present.
2 The DC power source is reconverted into the three phase AC power source with variable
frequency.
 When the frequency increases, the rotation speed of the compressor increases resulting in
an increased refrigerant circulation. This leads to a higher amount of the heat exchange per
unit.
 When the frequency decreases, the rotation speed of the compressor decreases resulting
in a decreased refrigerant circulation. This leads to a lower amount of the heat exchange
per unit.
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
freq=
constant
and cooling / heating load.
The compressor rotational speed is increased when starting the heating (or cooling). This
enables reaching the set temperature quickly.
outdoor temperature is 35.6°F (2°C).
A fine adjustment is integrated to keep the room temperature constant.
Once the set temperature is reached, the energy saving operation activates to maintain the
room temperature at low power.
Description
Refrigerant circulation rate (high)
high speed
high f
low f
low speed
50 Hz
capacity=
freq=variable
60 Hz
variable
Refrigerant circulation rate (low)
Main Functions
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
(R2812)
36