Daikin FDMQ09RVJU, Manual

Page: 29 / 152

SiUS071735EB Main Functions
Functions and Control 18
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
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 Limits
The following functions regulate the minimum and maximum frequency:
Forced Cooling
Operation
Refer to page 119 for details.
Refrigerant circulation rate (high)
high f
low f
freq=variable
Refrigerant circulation rate (low)
high speed
low speed
(R2812)
Amount of heat
exchanged air (large)
freq=
constant
50 Hz
60 Hz
capacity=
variable
Amount of heat
exchanged air (small)
AC
po
w
er
DC po
w
er
Amount of heat
exchanged air (large)
Amount of heat
exchanged air (small)
Frequency Functions
Low

Four way valve operation compensation. Refer to page 34.
High

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 38.
 Defrost control. Refer to page 40.