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TraxOil products are approved by the
major compressor manufacturers.


General Information:

All versions use a hall sensor to measure the oil level. A magnetic float changes its position according to the oil level. The hall sensor converts these magnetic field changes into an equivalent signal, which is used by the internal electronic to show the actual oil level with LEDs and activate the integrated solenoid valve to feed missing oil directly into the compressor sump. For application in refrigeration systems according to EN 378.


  • TR4 is developed for all traditional refrigerants and subcritical CO2.
  • TR5 is specially adapted to the requirements of transcritical CO2 systems and must be used with dedicated types of CO2 adapters.
  • An A-7 or Y11236C valve is not required with a TraxOil Electronic OLC.

Key Features

  • Digital processor with SMT components
  • Alarm relay can switch 24 to 240 VAC
  • CE approved, EMC emissions and immunity
  • UL approved
  • Meets European RoHS and WEEE directives
  • All timing functions are in true time
  • IP65 rated for dust and water
  • Waterproof cables with no wiring at TraxOil unit
  • No orifice restrictor
  • Danfoss coil and enclosing tube complete with internal solenoid seat
  • Tamperproof, cannot be adjusted in field
  • Set point levels use true levels with no timing overruns
  • Easily removable inlet fitting with built-in filter screen
  • Recommended by leading compressor manufacturers

Low-Pressure Oil System with TraxOil Controls

High-Pressure Oil System with TraxOil Controls

Resource Documents:

Key Features

  • TR4 compatible with HFC refrigerants
  • TR5 compatible with transcritical CO2 system and R410A
  • IP65 rating with molded housing and cable assemblies
  • Supply 24VAC or 230 VAC
  • 3-Zone Level Control using precise hall sensor measurement not prone to errors caused by foaming, or light, such as optical sensors.
  • SPDT output contact for compressor shut-down or alarming, rating 230VAC/3A
  • Easy installation by sight glass replacement and front/side mounting without nuts
  • Self-contained unit with oil level sensor and integral solenoid to manage oil level supply
  • LED alarm, status and level indication
  • Adapters suitable for various types of compressors
  • Recommended by leading compressor manufacturers


TR4 and TR5 are fully level controlled. The sight glass of each device is divided into three operational zones. When the level reaches the yellow zone (Yellow) the TR starts filling after a time delay of 10 sec. A further level drop to the red zone (Red) will switch the alarm relay after a time delay of 20 sec / 120 sec.

The current status is indicated with the 3 LEDs according to the following table:

Operating Condition/Status Function Contact Position LED
Supply power is off or normal oil level (<50%) OK BK-BU close
BK-BN open
Oil Level (close 40%) Injection Green
Oil Level < 40% Injection Yellow
Oil level too low < 30% Alarm + Injection BK-BU open
BK-BN close

Technical Data

Max working pressure 870 Psig 1885 Psig (inlet), 1450 Psig (outlet)
Solenoid coils/Supply voltage ASC3-24VAC: 24VAC±10%, 50/60 Hz, 17VA ASC3-24V-60Hz: 24VAC±10%, 60 Hz, 35VA
Solenoid valve max MOPD at 24VAC -0% 435 Psig (50 Hz, ASC3-)

290 Psig (60 Hz, ASC3-)

1450 Psig  (ASC3-24V-60Hz)

Flow Rate and Differential Pressure between inlet and outlet TR5

(Oil type Reniso C85E, oil temperature 54°C)

0 Supply Voltage 24V -0% (60Hz)
Supply Voltage 24V -10%(60 Hz)
Current 0.7 A
Alarm contact rating 3A/230 VAC
Alarm switch SPDT
Time delay filling 10 sec.
Time delay alarm 20 sec.

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