Emerson Climate Technologies has started the production of a family of semi-hermetic reciprocating compressors.

Called Stream, the range includes a range of 4 and 6 cylinder compressors designed for HFC refrigerants, a range of Digital semi-hermetic compressors for simple continuous capacity modulation as well as a range designed for CO2 transcritical applications.

All models are fitted with CoreSense Diagnostics that provides advanced compressor protection and diagnostics.

The range covers cooling capacities from 33 to 80 kW medium temperature, 11 to 28 kW low temperature with R404A and can be used also with R134a as well as R407A/C while being the most efficient compressors available.

Emerson says the ability to use several different types of refrigerant is down to the Discus valve plate technology.

It’s claimed that compared to other semi-hermetic reciprocating compressors, this technology allows 10 per cent better performance with R404A.

Contractors or installers can choose between two different modulation technologies: inverter technology or digital modulation.

Emerson say Stream is one of the quietest reciprocating compressors on the market with a sound reduction of up to 7dBA compared to previous generation of compressors depending on models and application.

A new sound shell can be fitted on Stream compressors and provides an additional 15dBA attenuation.

In addition to the HFC models 3 models for R744 (CO2) transcritical applications cover cooling capacities from 20 to 37 kW. This is the ideal solution for mediumtemperature cascade and booster systems when combined with Emerson’s ZO scroll range for CO2 subcritical.

These CO2 Stream models are characterised by a design pressure of 135 bar and are released for operation with frequency inverters. Refrigerant flow and heat transfer have been optimized for best performance.

All Stream compressor models feature CoreSense Diagnostics, an electronic module that provides advanced compressor protection and diagnostics benefits for improved system reliability, reduced service costs and increased equipment uptime.

With CoreSense technology, service engineers can now diagnose system-related problems faster or even before they occur in order to keep refrigeration systems in optimum condition over their entire lifetime.

The diagnostics module stores compressor asset and advanced runtime information. An individual compressor monitoring is also possible.

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