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A Commercial air unit does not produce enough air and what comes out does not come out cold. it sucking enough air through the filter, but producing very little. and the whole unit is running. is there a overload switch that we can check??

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  • Dana Newcombe
    Dana Newcombe May 11, 2010

    Is this a remote controled unit?


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If the return is pulling the proper amount of air in, and the supply side is not producing the proper amount of air, then the evaporator coil is clogged.

It could be from Ice due to freezing up, or a dirty coil, or both.

Examine the inlet side of the coil to see it's condition. Defrost/clean as needed. Then turn the unit back on and check the temperature drop. (the temp of the air going into the coil, vs the air coming out of the coil.)
It should be between 15 to 20 degreesF.
Also check the refridgerant charge. (this requires a CFC certification in the US.)

Dirty coils and low refridgerant will cause the coils to freeze up.

If the unit is low on refridgerant, it will need to be recharged.

Posted on Sep 07, 2009

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