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Thread: Air Conditioning Oil

  1. 16th February 2014, 01:32 PM #1
    Ancient Mariner
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    Air Conditioning Oil

    Anybody with a rear mounted evaporator unit in a Defender know how much extra oil was required in the system?Have just finished piping up my new unit ready to vac out 32000 btu 4.5 meters of 3/8" and 4.5 of 1/2" hose 7cyl Sanden
    compressor 650x 350 mm condensor and Redot horizontal filter dryer.The place I bought my fittings and hose suggested 50 mils but would`nt commit .If any AC guru would like to make a educated guesstimate it would be appreciated

    Thanks Noel
    Last edited by Ancient Mariner; 16th February 2014 at 01:51 PM. Reason: oil for gas
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  2. 16th February 2014, 02:07 PM #2
    Old Farang
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    Hmm, cannot exactly help you with the oil, but if the system is working correctly very little, if any, oil will be circulating around the system. So the advice given to you may well be on the mark.

    Just one thing though: maybe you have one extra zero on your BTU quote? 32,000 BTU is around 2.5 TONS of refrigeration, and seems a bit of an overkill.
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  3. 16th February 2014, 03:34 PM #3
    Ancient Mariner
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    Thanks 32000 btu is right
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  4. 16th February 2014, 03:50 PM #4
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    northiam
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    A new sanden 7 cyl compressor should have pre-charge of oil up to 250cc(ml)
    For a larger gas charge as yours, oil should be about right for testing
    Less than 80cc of oil should remain in compressor after 10min operation,

    See attached manual
    http://www.sanden.com/objects/Sanden...e%20Manual.pdf
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  5. 16th February 2014, 07:41 PM #5
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    Kev the Fridgy
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    50 mills would be pretty close to the mark
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