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Application Guide /FLEXAIR-AGU-1505-E
1.5. ELECTRONIC EXPANSION
VALVES
The new electronic expansion valves are directly driven by the
eClimatic and optimize the performances in both cooling and
heating mode and provide reliable and accurate operation in all
conditions all year round.
This model of electronic expansion valves ensures also smooth
and precise control at low capacities for improved part load
performances.
Multiscroll” compressor technology with electronic expansion
valves allows energy consumption reduction when compared
to “inverter” solutions:
• Multiscroll compressors are always running at their best
nominal operating conditions whereas compressors with
inverter control usually run at 90 Hz for nominal point down
to 30 Hz for low capacities.
• Energy consumption due to inverter electronics for speed
variation can reduce effi ciency by up to 5%.
• Multiscroll compressor assemblies optimize heat exchanger
usage during part load operation. For example, with 50%
capacity load, a FLEXAIR would only start one compressor
on each circuit. The running compressors would then benefi t
from the whole heat exchange surface area and the whole
airfl ow rate: The EER is then increased to 4.5 in some cases.
• Multiscroll compressor assemblies improve operating limits
giving the possibility to unload compressors providing cooling
to the building even when the outdoor temperatures are very
high. With unloading, FLEXAIR can operate and supply
cooling operating one compressor with outdoor temperatures
reaching 50°C.
1- GENERAL DESCRIPTION
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