Outside (condensing unit?) Hiss @ Shut Dn

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Old 06-14-09, 09:13 AM
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Outside (condensing unit?) Hiss @ Shut Dn

Hi - I have central zoned (Up/dn) system. One of the outdoor units (condensing unit??) hisses rather loud when it shuts down. Hiss will diminish/go away after about 8 or 10 seconds. Any thoughts on what this is? Is it normal? Unit(s) is/are 8yrs old (new 8yrs ago). I have not had them serviced/checked - ever. Other than this hiss, all operation is fine - always has been. Thanks for any insight. Thirsty Red.
 
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Old 06-14-09, 10:26 AM
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Is this a heat pump system?
 
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Old 06-14-09, 11:58 AM
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Not a Heat Pump System

No, this is not a heat pump system. Sorry, should have included in post. TR
 
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Old 06-14-09, 07:54 PM
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The pressures aare equalizing between the low and high side. It is normal.
 
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Old 06-15-09, 05:49 AM
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Pressure equalization at the condensing unit?...??
 
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