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Why doesn't the second stage cooling work

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If you have a two stage cooling system, you are probably unaware of its turning the second stage on and off unless you are right there listening to it or have the proper tools with which to tell. Most of the times, it is just a higher speed that the compressor runs on with a change to stage two.

Many times, a two stage cooling stat is installed in a single stage system because that is what was on the service truck. If so, it will operate the same on first stage as a single stage will. Usually the tech gets into the setup and changes the configuration to make the stat believe it is only has one stage. Many people may think they have an option that's not there.

Just a possibility.

Posted on Dec 02, 2014

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Posted on Jan 02, 2017

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What do two snow flakes on the left side of the control display mean on a Robert Shaw 9420 thermostat?


The double snowflake means that the second stage cooling is on. (One snowflake indicates first stage cooling.) This gives a greater temperature change in extremely hot conditions with than you could get with a single cooling medium and drier air in your home.
From the patent: A two stage cooling system in which the first stage's cooling affect is transferred to the second stage through direct contact with an oil-like material. The oil-like material is cooled by direct contact with water which has been evaporatively cooled. The oil-like material is then utilized to cool the air stream prior to the second stage evaporative cooling. The use of an oil-like material in the first cooling stage of evaporative cooling allows a relatively dry air stream to be produced so as to fully capitalize upon the evaporative cooling affect of the second stage cooler.

The second stage comes on if your system hasn't reached the desired temperature at the thermostat within a programmed length of time (5 minutes is a usual setting). BTW: Your system also has two stage heating.

I hope this helps.

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