The heat of the tube is very clear. It is the sound of the airflow when the mechanism is hot. It will be small in a few minutes (close to hearing). Is this a little bit of a bunch of gas?

4-Way Reversing Valve or compressor after the appearance of the fault phenomenon is basically the same, after a short period of time after the pressure machine current small, pressure rise to the static pressure about, before all the first 4-Way Reversing Valve to try again. Now have a certain experience, the failure of the two valve off, it is best to stop the external fan, and then listen to the external machine there is no hissing similar to the sound of the refrigerant flow, if there is a sound that is the 4-Way Reversing Valve string gas, if there is no sound that is the pressure machine string gas. It is especially time-saving and accurate when the press is working at a certain time.

4-Way Reversing Valve4-Way Reversing Valve used in packaged and central air conditioners
The heat of the tube is very clear. It is the sound of the airflow when the mechanism is hot. It will be small in a few minutes (close to hearing). Is this a little bit of a bunch of gas? 4-Way Reversing Valve or compressor after the appearance of...