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How to evacuate system after installing air conditioner air handler?

I just installed a new-old-stock (2006 R22 scroll compr.) Amana condensing unit and matching Goodman air handler in an older house with existing vapor and liquid lines. I am a certified tech (10 years ago) with no experience. Now that I have the system installed I need to evacuate the lines and air handler I understand the condensing unit is pre-charged. I've discovered that the service ports on the condensing are not open to the lines so I can't evacuate unless I release the pre-charged R22 into the contaminated lines and air handler. Do I have to cut the lines and install a service port to evacuate the system?

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  • davep10000 Nov 01, 2012

    Actually, I've found out that the service ports on the service valves of the condensing unit are open to the lines and evaporator/airhandler when the valves are closed and holding the precharged freon in the condensing unit. You can make any leak repairs, line or evaporator replacement/service and then evacuate the air and any moisture before releasing the precharged freon.

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I've never seen service ports that are not connected to the lines. They should be. If you gently push on the shraeder core there should be no pressure. Once you open the valves, then you have pressure. So you must pull a vacuum on the lines, as you already know. How did you learn that the ports are not connected to the lines? They have pressure? Not sure what's going on but something's different.

Posted on Apr 12, 2017

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The service valves are closed. Therfore once you solder to the stubs on the valves your gauges will read what is in the line set and evaporator coil. Pressure test to 150 and let sit. If determined your pressures held then evacuate with vacuum pump. You are evacuating the line set and evap coil only because your service valves are closed. THIS IS THE PROPER WAY TO DO THIS. Once evacuated to 500 microns, close manifold and open valves. You will then see your refrigerant charge and determine if more refrigerant is needed. Good Luck !!

Posted on Apr 11, 2017

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icemelts
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SOURCE: I have a blown BDP 7.5 ton Condsor unit. The old

I've done what you are describing - "however" you could void the warranty on the new condenser - by not having 'matching' coils (inside/outside). I would do some serious checking with whoever you are buying the new condenser from.
Note: I would (if possible) go back with a R-22 condenser unit (price is about the same), and you would not have any 'warranty or matching issues' going on.

Posted on Jun 07, 2011

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