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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1 Answer

I have low suction pressureat 43 normal head pressure at 260 only a 2 degree temp drop what could be my problem thanks

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My AC doesn't seem to be as cool as usual ive checked the pressure ( 100 and 30 )but i cant find what normal is. the model # on my unit is 561cj048-f

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Jul 08, 2011 | Bryant Heating & Cooling

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May 19, 2011 | Heating & Cooling

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Temp off air coming out of register 74 degrees suction line temp is 42 degrees but high side line isnt warm dont look like it is wanting to take freon either compressor is running new system low side is...

Hello, what is your high side pressure? A bad compressor will show abnormally high low side pressure with abnormally low high side pressure. That 45 low side pressure is low And superheat high. If you high side pressure is normal toma little above normal but the low side remains low you have a restriction in the system, that might be why it's not taking in tne freon. Let me know you high side pressure

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May 10, 2010 | Heating & Cooling

2 Answers

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

The pressure changes with temperature, it is not a true gauge to ensure a proper charge.

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.
With the exact same unit, but 80 degree outdoor temp combined with 70 degree indoor temp, your pressures could read 215 low side and 55 low side. Not to mention that more efficient units often have higher pressures on the low side because they have more coil space and remove heat more efficiently)

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1 Answer

Gas pressure

for R-22 gas low is 400 kpa high is @ 1200 kpa depending upon the ambient temperature

Jul 27, 2009 | Ruud UBHC Air Conditioner

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