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Refrigerant Piping Work
Design and installation of the refrigerant piping work largely affect the performance of the refrigeration unit as well
as the product life and problem occurrence.
Installation work should comply with the following items. Installation of all equipment have to be in accordance to
Pressure directive 2014/68/EU and European norm EN 378 «In the European Market».
Or, Australian norm AS/NZS 5149 «In the Australian and New Zealand market».
Selection of Refrigerant Piping Size
The connection piping size for refrigeration unit is, in principle, as shown below, but each should be determined by
calculating pressure loss of the piping and refrigerant flow speed and making sure no problem occurs in the cooling
capacity and oil return.
As refrigeration unit using CO
2
refrigerant incurs pressure higher than when using HFC refrigerant, it is necessary to
choose adequate materials.
Model No.
Suction line (Unit inlet)
Liquid line (Unit outlet)
OCU-CR1000VF8A(SL)
Ø19.05 mm, 3/4”
Ø15.88 mm, 5/8”
Note: Welding is outer diameter welding.
● Piping material should be seamless phosphorous-deoxidized copper pipes (refrigeration grade), K65.
● When cutting pipe, use a pipe cutter and always remove burrs.
● When bending pipe, secure a bending radius 4 times or greater of the outer diameter. During bending, pay attention
to distortion and scars.
Use sufficient caution for handling piping by sealing the pipe end with tape or any other cover for
avoiding entry of contaminants and moisture into the pipe.
Caution
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