New ERM5 oil level regulators with increased pressure limits - available October 2015!

By Silvia Scaldaferri, Sep 10, 2015, 11:29 2 minute reading

Designed for all common compressors, the ERM5 series is now approved for pressure differences of 1.5 up to 100 bar, and a maximum working pressure up to the solenoid valve of 130 bar.

In multiple-compressor parallel systems oil level regulators are installed to maintain the adequate oil level, which is conventionally fed from an oil reservoir.

Available in October 2015, the ERM5 is the fifth generation of ESK Schultze’s oil regulators. This product class incorporates improved features such as a compact and modular design, and increased pressure limits. The main body connected to the compressor is approved for 60 bar or 130 bar (type: ERM5-CDH), while the maximum working pressure up to the solenoid valve is 130 bar.

Increased operational safety of frequency controlled compressors

The types ERM5-OC-FU and ERM5-0-BC-FU have been developed for frequency controlled compressors, which are becoming increasingly important in modern refrigeration systems. Seeing as these compressors have variable oil carry-over rates, the function of the ERM5*-FU is to alert the user if the carry-over oil exceeds the oil return and signals it. Therefore, it is possible to reduce the compressor frequency for a period of time and ensure higher operational safety.

Technical specifications of ERM5 Series

  • Working pressure difference oil return: 1.5 - 100 bar
  • Maximum allowable working pressure up to the solenoid valve: 130 bar
  • Oil refill cycles: filling - measuring: 5 sec / 10 sec

The main differences between models are that the ERM5-0-BC type has a 3/4-bolt-flange compressor connection, whereas the ERM5-OC has a 1.1/8"-18 UNEF threaded connection and a MWP of 60 bar.

* Main dimensions and all connectors remain unchanged.

Advantages of the ESK oil regulator family

  • Approved for a wide variety of refrigerants including CO2 (R744), hydrocarbons R290 (propane) and R600a (isobutane)
  • High control accuracy due to multi-point measurement
  • An integrated 230 V power supply
  • All components like the solenoid valve, electronic module and connectors are factory mounted (‘plug and play’)
  • Replaceable oil filling ratio for special working conditions via a programming key.
  • Modular design for an easy failure analysis and economical repair
  • For all common compressors adapters are available

Operating instructions for the ERM5

About ESK Schultze

ESK is a German manufacturer of components for refrigeration, air conditioning and heat pump applications. ESK produces components for subcritical and transcritical CO2 refrigeration systems, as well as components for ammonia and hydrocarbon systems. The company’s product range includes oil regulators, oil separators, oil reservoirs, check valves, shut off vales, strainers, filter driers, liquid receivers, discharge line mufflers and more.


By Silvia Scaldaferri

Sep 10, 2015, 11:29

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