ASERCOM Guide Books

ASERCOM and its members combine excellent industry and technology intelligence. The association’s detailed recommendations for using frequency inverters with positive displacement refrigerant compressors have been published in the following guide books.


The rating standards for compressor and condensing unit performance data assume publication of data representative for the average produced units. The tolerance allowed according to the AHRI and EN standards is regularly reconsidered during revisions. These standards do contain descriptions of the rating conditions and associated tolerance values. The tolerance values in AHRI 510, AHRI 520, AHRI 540, AHRI 570, EN 12900 and EN 13215 are varying with the rating conditions and are considered necessary with the present state of USA and European production and testing standards.

ASERCOM guidelines for the design of multiple compressor racks using frequency inverters

This document provides a guideline for the design of compressor racks containing inverter driven and fixed speed compressors. The scope is limited to refrigeration application using semi-hermetic or hermetic compressors, based on scroll, reciprocating and screw compression technology.

Refrigerant Glide and Effect on Performances Declaration

The scope of this guideline is to give an overview of the relation between the dew and mid temperature for non-azeotropic mixtures, highlight the difference in performance and give a recommendation for converting the performance of the compressor regulated by the existing standards to mid-temperature performance. In this case, any misunderstanding and wrong interpretations of the result are avoided.

Recommendations for using frequency Inverters with positive displacement Refrigerant Compressors

The recommendations in this guide book concern the application of externally-mounted frequency inverters for the speed variation of refrigerant compressors driven by three-phase induction motors. This paper is directed to planners and contractors designing and installing such energy saving systems. The purpose is to reduce the risk of damage to refrigerant compressors when operated at variable-speed and to provide general design guidelines for reliable, energy-saving operations of refrigeration installations.