Daikin FTX-N Series Service Manual page 50

Common Functions
 When the frequency increases, the rotation speed of the compressor increases resulting in an
 When the frequency decreases, the rotation speed of the compressor decreases resulting in a
The following drawing shows a schematic view of the inverter principle:
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 extreme cold weather, high capacity is achieved. It is maintained even when the
 Comfortable air conditioning
 Energy saving heating and cooling
Frequency Limits
The following functions regulate maximum frequency:
Low frequency
 Four way valve operation compensation. Refer to page 81.
High frequency
 Compressor protection function. Refer to page 81.
 Discharge pipe temperature control. Refer to page 82.
 Input current control. Refer to page 83.
 Freeze-up protection control. Refer to page 84.
 Heating peak-cut control. Refer to page 84.
 Defrost control. Refer to page 86.
Forced Cooling
Refer to page 199 for details.
Operation
45
increase of refrigerant circulation. This leads to a larger amount of heat exchange per unit.
decrease of refrigerant circulation. This leads to a smaller amount of heat exchange per unit.
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
freq=
constant
and cooling/heating load.
The rotation speed of the compressor is increased when starting the heating (cooling).
This enables to reach the set temperature quickly.
outdoor temperature is 2C (35.6°F).
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.
Refrigerant circulation rate (high)
high speed
high f
low f
low speed
50 Hz 50 Hz
capacity=
freq=variable
60 Hz 60 Hz
variable
Refrigerant circulation rate (low)
SiUS091601EA
Amount of heat exchanged air
(large)
Amount of heat exchanged air
(small)
(R2812)
Part 4 Functions and Control