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Thread: oil Return for R410a
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31-05-2010, 12:40 AM #1
oil Return for R410a
Would like to know what is the limit on the length of a vertical riser for the suction line, size 1.1/8 (Inch and one eighth) on a 410a installation. Capacity of system 12 kW, evaporating @ -5C, condensing @45C. What trapping arrangements is needed to insure proper oil return. All help appreciated.
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31-05-2010, 01:12 AM #2
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31-05-2010, 05:51 AM #3
Re: oil Return for R410a
You did not mention the length of the pipe both horizontal and vertical.
For 20 m run you need 7/8" suction tube. If you give exact number of fittings and length then I can give you the exact tube size.
About the vertical riser : If you use correct pipe size then only you need oil traps. Depending on your tube size you have to install oil traps every few meters. For example for 7/8" tube every 5 m is OK. There is no formula to calculate the traps distance. The bigger the diameter then more oil is on the tube walls.
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