It is not necessary that the temperature setting is extremely close to the operating point, 135 ° C maximum, 120 ° C is here a good practice value. This task can be carried out by a simple mechanical thermostat with remote sensor (eg "KP 81"). For this reason, it is recommended to install or retrofit a compressed gas end temperature monitor for systems with scroll compressors, if this is not available. then it can quickly come to excessive pressure nozzle temperatures. that such a compressor, for example, by a permanent strong throttling of an evaporative pressure regulator - or for other reasons - a long time with the suction pressure far below its application limits is driven, then it can quickly come to excessive pressure nozzle temperatures. For example, "MLZ" scroll compressors, when operated at the usual evaporation temperatures of -10 ° C, will show no abnormality in terms of final compression temperature, which means that in the rarest of cases the value will rise above 100 ° C - for compressors, Bearing, scrollset and refrigeration oil are no problem. In particular, the compression end temperature is always an issue in scroll compressors. There are all housing sites on the compressor (with the exception of the pressure port) on the suction side and thus have no high temperatures. This is not the case with fully hermetic reciprocating compressors. In general, one should bear in mind when first contacting with scroll compressors that in this type of compressor the head, ie the upper 20% of the compressor, Compression end temperature (hot gas temperature) has. The assembly of the scroll compressors is done on rubber buffers. Inside the "scroll compressor head" is a check valve, which avoids a reverse rotation of the scroll set after switching off the compressor. Both are designed as solder sockets integrated directly into the compressor. The refrigeration connections for these compressors are arranged one above the other - suction side down (large connection) and pressure side up (small connection). This means that it may be possible to mount a silencer hood because the compressor releases all the excess heat from the refrigerant that flows through it. In this context, the installer should note that MLZ compressors may initially experience a certain under-performance during initial start-up.Īll Danfoss scroll compressors are 100% suction gas cooled. It is a flexible interaction of the two scroll screws while self-optimization of the interaction in practical operation. This "break-in phase" is completed at the latest after 72 hours of operation. As a result, the two spirals are "retracted", so to speak. During operation of the compressor, one of the two spirals is pressed against the other by means of a medium pressure from a "pocket" of the scroll set, in which the complete compaction has not yet been completed. Noise problems or malfunction of pressure switches caused by pulsations are not to be expected in systems with scroll compressors. For the fitter this means that a muffler rarely has to be used for pulsation damping. Thus, compared to reciprocating compressors, smaller portions of refrigerant are ejected more frequently. Due to this principle, there are different stages of compaction at each stage of the compaction process (different sized "pockets" in which compression is taking place). These two spirals engage and compress the refrigerant by an orbital motion from the outer part of the scrollset toward the center. This scrollset consists of a fixed and an orbiting spiral. Scroll compressors are also ideal for normal cooling applications.ĭanfoss scroll compressors have the crankshaft standing upright. The scroll compressor is also gaining more and more market share especially in the heat pump sector. Scroll compressors are very common in air conditioning applications - their classic application is the chiller. Today we focus on scroll compressors for refrigeration. These are, for example, scroll compressors, screw compressors, rotary piston compressors, turbo compressors and reciprocating compressors. Compressors are available with different operating principles. It brings vapor refrigerant from a low pressure level (low pressure suction side) to a high level (high pressure side). The compressor is the heart of every compression refrigeration cycle.
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