charging a resicential ac

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  #1  
Old 07-22-02, 07:17 PM
gumbyglass
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charging a resicential ac

what is the proper procedure in charging a residential ac that has the line sets cut and rewelded with out a pump down being done to it?
 
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Old 07-23-02, 05:02 AM
ServiceGrunt
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There is no proper way to charge a system without a proper evacuation (pump down). There are shady characters out there who do it other ways which gives us plenty of business on repairs. Call a pro and get it done right. It will be cheaper in the long run.
 
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Old 07-23-02, 05:13 AM
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If system has been openned, installation of a line drier is recommened.
Leak test should be performed (e.g., nitrogen with soap solution).
Deep vacuum (<500 micron) system to remove moistrure. (tripple nitrogen purges and deep vacuums are recommended).
If refregerant is totally lost, you can charge by weight then check super heat/sub cooling by specs.
 
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Old 07-23-02, 05:20 AM
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By "pumping down", some HVAC tech mean to recover most refrigerant to condenser using the compressor, shut off the valves and recover rest refrigerant in line set and coil before open system for repair.
In this case, only small amount of refrigerant needs to be recharged after repair.
 
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