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Old 07-21-2012, 01:41 AM   #1
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overcharging an ac unit


can you explain what cause the pressure to rise on the low and high side when you overcharge an ac unit.

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Old 07-21-2012, 02:35 PM   #2
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overcharging an ac unit


Ah where to began...



Compressor is the pump the low side is the suction and the high side is the discharge. The discharge flow freely to it meets the metering device at the indoor coil. The metering device causes a designed restriction. This restriction causes a change of state and temperature. The low temperature low pressure refrigerant then travels back to the compressor where it is pumped back to a high pressure high temperature gas and is sent to the condenser (outside) coil where it is condensed into a liquid again and sent to the indoor unit again.



Add to much refrigerant and the pressures on both sides rise until you get a flooded evaporator which is a whole other matter....

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Old 07-21-2012, 05:35 PM   #3
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overcharging an ac unit


once the liquid line is formed out of the condenser anything over that 2 or 3 rows from the bottom takes up condenser area and the ejection of the heat from that discharge gas from the compressor.everything follow up by rising..head,liquid ine pressure and right into that suction.then the suction being 75PSI or above you lose the temperature to make the indoor coil drop the room air...a dirty condenser on a normal charge will cause the same effect...never charge a unit with a dirty condenser always clean it first with the guages on to see the cleaning results in pressure drop
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Old 07-21-2012, 09:22 PM   #4
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overcharging an ac unit


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Originally Posted by astovall7 View Post
can you explain what cause the pressure to rise on the low and high side when you overcharge an ac unit.
Homework??
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