Single compressors
Inverter compressors
Inverter technology offers more flexibility
in compressor selection than fixed-speed
compressors. Selection of the right inverter
compressor size can be made by different
methods:
1. Maximum cooling capacity: Select a
compressor size which achieves the peak load
system cooling capacity demand at its maximum
speed.
2. Nominal cooling capacity: Select a compressor
size which achieves the nominal system cooling
capacity at a rotational speed of 3600 - 4500 rpm
(60-75 rps).
3. Best Seasonal Efficiency Ratio: Select a
compressor size which achieves the minimum
system cooling demand at its minimum speed.
Ensure that the compressor is able to cover the
peak load system cooling capacity. This selection
makes the compressor run for a maximum time at
part load where the system efficiency is highest.
Performance tables at three speeds can be found
in the following pages. Detailed performances
can be found in datasheets and in selection
programs.
Compressor size
Different frequency converter variants are
available according to:
1. Mains supply voltage
2. IP class (CDS803 drives are available in IP20 or
IP21 (requiring additional kit) housings)
3. RFI (Radio Frequency Interference) class H4
4. Printed Circuit Board (PCB) coated
When the compressor size and mains voltage
have been defined in the above selection criteria,
the code number tables from the “Ordering
information and packaging” section provides the
appropriate frequency converter sizes and up
to eight corresponding code numbers for each
compressor model.
Note this compressor is equipped with
a four-pole electrical motor so the applied
frequency from the inverter will be 30 Hz
for 15 rps (900 rpm) up to 200 Hz for 100 rps
(6000 rpm).
Please refer to the table below
Frequency converter
variants
Compressor and
frequency converter
combinations
min
max
Compressor speed
rps
15
100
rpm
900
6000
Drive output frequency
Hz
30
200
7
FRCC.PC.034.A2.02
Application Guidelines
