Danfoss MLM116, Инструкции по применению

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General overview
The application guidelines describe the
operating characteristics, design features and
application requirements for MLM/MLZ116
parallel compressors in medium temperature
refrigeration applications.
To ensure proper parallel installation and running
conditions, the following recommendations must
be followed:
• It is essential to follow all the instructions
given in these guidelines, the instruction
leaflet delivered with each compressor and the
Application Guidelines for single compressors.
• For additional system components related to
specific application requirements, the supplier's
recommendations must always be followed.
Parallel compressor installation refers to a system
of interconnected compressors with a common
suction line and common discharge line. The
technique of mounting compressors in parallel
is also referred to as manifolding. In a system
with only two compressors, this is referred to as a
tandem configuration.
The main reason for manifolding is reduced
operating cost through greater control of
capacity and power consumption. This is
achieved by staggering the compressor switch
on sequences that allow the parallel system to
match its power with the capacity needed.
A second reason for manifolding is improved
part load efficiency. In a parallel installation the
individual compressor(s) can be switched off
while the other compressor(s) keep operating at
100% load. Therefore the part load efficiency is
very near the full load efficiency. Conventional
fixed-speed compressor unloading methods
impose a serious penalty on part load efficiency,
mainly at low load conditions.
Scope
Benefits
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FRCC.PC.035.A4.02
Application Guidelines Manifold compressors