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A\c unit This a\c unit does not cool at all, the compressor does cut in

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  • g2nj Jul 22, 2008

    How do i check pressures and how should the thermostat be checked.

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It cold be different problems.
1-check for any air leaks around the house.
2-check the return box and see if have any opening and seal the holes.
3-check the insulation on the attic or any motor that takes the heat out the attic.
4-check if the unit is under tonage each tonage mean a 400 sf per ton.
5-check if the air handler coil is not dirty and enought air going thru the coil.
6-check the pressure of the condenser unit if have the rigth presures.
7-check thermostat if is set-up right.

Posted on Jul 22, 2008

  • Giovanny Mejia Jul 25, 2008

    To check pressure you need a gauge for r-22 or other refrigerant. regular pressure will be 70 in the low side and 250 in the hight side.



    To check thermostat you need to disconect the red wire and the green together them the unit inside will come on and put together the red wire with the yellow and the condenser unit will come on if they dont come on with this test the thermostat not working properly.

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