Daikin K-Series Service Manual page 26

SiBE061121.book Page 16 Monday, April 25, 2011 3:20 PM
Main Functions
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
Forced Cooling Refer to page
Operation
16
Refrigerant circulation rate (high)
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
50 Hz
freq=
constant
60 Hz
Refrigerant circulation rate (low)
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 34.
Compressor protection function. Refer to page 34.
Discharge pipe temperature control. Refer to page 35.
Input current control. Refer to page 36.
Freeze-up protection control. Refer to page 37.
Heating peak-cut control. Refer to page 37.
Defrost control. Refer to page 39.
for detail.
131
high speed
high f
low f
low speed
capacity=
freq=variable
variable
Functions
SiBE061121
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
(R2812)
Function and Control