Question about Coleman Mach 15 Air Conditioner

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Low and high pressure,

What is the normal low and high pressure, R-22..??????????????

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Thanks for the help>>

four blue blocks....fixya....

thanks wayne earles

Posted on Jul 01, 2008

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High pressure any where from 200-325. Low pressure around 65-70ish. But pressure doesn't really tell you much about how the system is working. You also need to check your superheat on the vapor line and your subcooling on the liquid line. If you don't know what I'm talking about, then you are treading in very dangerous territory of doing serious damage to your system if you are trying to adjust the charge based solely on pressure.

Posted on Jun 30, 2008

  • Chris Lyon
    Chris Lyon Jul 04, 2008


    If you would be so kind as to go back in and rate my solution from your "wearles" login. There is actually a Fix-Ya icon you need to click on there for the system to acknowledge your rating.

    Thank You,



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Indoor unit temperature between 60F & 70F after R22 charge..

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You should have a 15 to 20 degree temp drop across the evap coil. (return air vs supply air)

Can you verify that the compressor is running?
Not the condenser, but the compressor located inside the condenser (outdoor unit)

it really sounds like it is still undercharged.
Check the temp drop, let me know what it is.
Also tell me what the outdoor ambient temp is.

( for example.... 98 degree outdoors with 85 degree indoor temp could result in pressures something like 325 on the high side and 75 or 80 on the low side.
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