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Txv

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johnjohn89
johnjohn89 Member Posts: 100
in A-C, Heat Pumps & Refrigeration
Does TXV equalizing system when unit is off? why high side and low side need to balance during off cycle?

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  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,867
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    Equalizing the high side and low side pressure difference does happen thru the TXV valve over time. 3 to 5 minutes. Reason you need this to happen... so the electric motor that operates the compressor does not need to be extra large Horsepower. If you have a compressor start trying to compress a gas where there is already high pressure at the discharge port of the compressor, the motor must work harder to over come the already compressed gas. Like an air break the piston will not compress the already compressed gas as easily as it could if the pressure on the discharge port was much lower. This is the reason there is a time delay built into so many of the higher compression systems.

    Does that help?

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

  • pedmec
    pedmec Member Posts: 977
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    depends of the type of txv you are using. a bleed type or non-bleed type. a bleed type allows high side pressure to bleed into the low side of the system to equalize the pressures. a non-bleed does not have a bleed port. non-bleed requires a hard start kit to help the compressor on start-up.
  • johnjohn89
    johnjohn89 Member Posts: 100
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    EdTheHeaterMan said:
    Equalizing the high side and low side pressure difference does happen thru the TXV valve over time. 3 to 5 minutes. Reason you need this to happen... so the electric motor that operates the compressor does not need to be extra large Horsepower. If you have a compressor start trying to compress a gas where there is already high pressure at the discharge port of the compressor, the motor must work harder to over come the already compressed gas. Like an air break the piston will not compress the already compressed gas as easily as it could if the pressure on the discharge port was much lower. This is the reason there is a time delay built into so many of the higher compression systems. Does that help?
    Oh yeah! Thank u so much 
  • johnjohn89
    johnjohn89 Member Posts: 100
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    pedmec said:
    depends of the type of txv you are using. a bleed type or non-bleed type. a bleed type allows high side pressure to bleed into the low side of the system to equalize the pressures. a non-bleed does not have a bleed port. non-bleed requires a hard start kit to help the compressor on start-up.
    Oh ok thank u

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