134a pressures

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  • March 8, 2006 at 5:04 pm #16204
    den
    Participant

    Silly question, but Ive been away from fridges for a wee while.
    On a normal domestic system, what does my gauge read when connected to the low pressure side if all is ok. This is with 134a.
    The last time I did a regass was with r12, and as far as I can recall. A good system was bang on zero.

    March 8, 2006 at 5:57 pm #168820
    bonzaco
    Participant

    Re: 134a pressures

    Broad brush – With the compressor running, somewhere between 2 and 5 psi. Hope that helps.

    March 8, 2006 at 8:15 pm #168821
    3stars
    Participant

    Re: 134a pressures

    I have always found with a cold cabinet R134a will be 0 – 2″Hg.

    March 8, 2006 at 9:26 pm #168822
    admin
    Keymaster

    Re: 134a pressures

    R134a boils off at -28 degrees C, this should equate to zero back pressure, therefore stat turns off the compressor.


    Thats if you can find an oil free system 😉


    Kevin

    March 8, 2006 at 10:48 pm #168823
    johnnyj
    Participant

    Re: 134a pressures

    Depends on the size of the system some GE Food centres can pull well into the -5 and below and be okay and a wee larder fridge could be + 3 or there abouts and be okay.

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