Main Functions
SiUS041829E
24
Part 4 Functions and Control
When the frequency decreases, the rotation speed of the compressor decreases resulting in a
decrease of refrigerant circulation. This leads to a smaller amount of heat exchange per unit.
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 (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:
Low frequency
Four way valve operation compensation. Refer to page 49.
High frequency
Compressor protection function. Refer to page 49.
Discharge pipe temperature control. Refer to page 50.
Input current control. Refer to page 51.
Freeze-up protection control. Refer to page 52.
Heating peak-cut control. Refer to page 52.
Defrost control. Refer to page 54.
Forced Cooling
Operation
Refer to page 126 for details.
Refrigerant circ
u
lation rate (high)
high f
low f
freq=variable
Refrigerant circ
u
lation rate (low)
high speed
low speed
(R2812)
Amo
u
nt of heat
exchanged air (large)
freq=
constant
50 Hz
50 Hz
60 Hz
60 Hz
capacity=
variable
Amo
u
nt of heat
exchanged air (small)
AC
po
w
e
r
DC po
w
er
Amo
u
nt of heat exchanged air
(large)
Amo
u
nt of heat exchanged air
(small)
Summary of Contents for RX09RMVJU9
Page 17: ...SiUS041829E Part 2 Specifications 13 1 Specifications 14 Part 2 Specifications ...
Page 125: ...SiUS041829E Check Part 6 Service Diagnosis 121 18 class R25105 1 2 3 4 Multimeter ...
Page 127: ...SiUS041829E Check Part 6 Service Diagnosis 123 18 class R20704 W V U DC_P1 DC_N1 ...
Page 143: ...SiUS041829E Operation Limit Part 8 Appendix 139 4 Operation Limit RX09 12 18RMVJU9 3D092209E ...
