The steps found in this article must only be performed by a licensed HVAC Technician. Please note that it is against EPA Regulations for anyone that HAS NOT obtained a Section 608 Type 1,2,3, or Universal License to; buy or work with any type of Refrigerant.
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If you are not Section 608 Certified, do that first before continuing any further!
Locate the information panel of the unit you are working on and identify which type of refrigerant it uses. The most common types for residential unit are either R-22 or R410a. For car system R12 (old) or R134a (new)
Be sure you know which one your unit use before proceeding.
Hook up your gauges to the low side then the high side. Your low pressure is most commonly found to be the bigger tube, and of course the High side being the smaller.
Purge your hoses of any air that might have gotten inside so it. You do this by holding the yellow hose away from you and opening your low side slightly for 1 second, then your high side for one second. (Make sure to close both sides back when you’re done)
Hook up your yellow hose to the “IN” side of your recovery unit. Recovery Machines all look a little different but they all do essentially the same thing.
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Hook your extra yellow hose up to the “OUT” port of your recovery unit.
Just like with your gauges you’re going to want to purge your recovery unit as well so once you hook up the yellow hose just release some gas from the low side for 1 second.
Hook up the other end of the yellow hose to the Liquid side of your recovery tank. On your recovery tank, you should have two ports one blue, one red. Just like blue and red on your gauges represents low and high sides respectively your recovery tank is the same so you want to hook up to the RED port.
Open the low side on your gauges. Make sure both ports on your recovery unit are open, and then open your valve on your recovery tank.
Turn on the recovery unit and wait for your gauges to drop to zero psig. When you’re finished recovering close your gauges and turn the recovery machine off.