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I have central air (Amana). Is it common to hear a loud surge sound when the unit comes on. It was installed this summer.

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Hi, this surge sound that you are hearing is probably the freon moving through the lines on start up, and if this is a heat-pump and not a gas fired heater you have on this central unit, when the reversing valve is energized in either the cooling mode or the heating mode, you will hear a loud surge of freon gas moving the sleeve in the valve to switch it from one posistion to the other.It is rather loud but should only last for a few seconds or so. If it continues to make this sound after start up, it should still be under warranty, so I would call them out before it expires to be sure its not any thing else. I am sure if you have a heat-pump, and you don't have a gas heater, its just the reversing valve shifting over that is making this surging sound as this is the sound they make. Please keep me posted if it gets worse or you are not sure, and please don't forget to rate me as I know you will be kind.
A/C, Heating, & Refrigeration Contractor

Posted on Sep 08, 2010

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