If you were only going to change one thing – this is it! If you’re stuck pulling through valve cores, get two of these.When liquid recovery is complete, switch to Direct Vapor Recovery. Open the vapor line service valve or core tool and then loosen and unseat the hose connected to the vapor port on the recovery tank until the refrigerant is present and then retighten.ħ. Open the liquid line service valve or core tool and then loosen and unseat the hose connected to the liquid port on the recovery tank until the refrigerant is present and then retighten.ī. PURGE THE HOSES OF AIR (this is done slightly differently than in direct recovery.)Ī. Start with all valves closed (recovery cylinder, recovery machine, manifold, hoses.)ĥ. Tip: Using an inline sight glass during push-pull recovery will allow you to visually determine when the liquid flow has stopped.ġ. The more refrigerant the system holds, the more time you’ll save. Close all valves and recovery is complete!Ī post shared by Gary McCreadie HVAC Tech will be your faster option if the system has 15 or more pounds of refrigerant. PURGE THE RECOVERY MACHINE – this one can be pretty specific – so check your manual if you’re unsure.ġ4. Many recovery machines will turn off once the system reaches a vacuum.ġ3. When the liquid recovery is complete, fully open both the high side and low side manifold valves.ġ2. The manifold high side valve may need to be adjusted to throttle refrigerant flow into the refrigerant recovery machine to avoid liquid slugging.ġ1. The below steps should be standard for most recovery machines-ġ0. Fully open the vapor valve on the recovery cylinder.Ģ. PURGE THE HOSES OF AIR, loosen and unseat the hose connected to the recovery tank until the refrigerant is present, and then retighten.Ĩ. Open the high side of the manifold for liquid recovery.ħ. Set the refrigerant recovery machine to recover.Ħ. The below steps will vary with your recovery machine-ĥ. Open hose valves, core removal tool valves or service valves.ġ. Start with all valves closed (recovery cylinder, recovery machine, manifold, hoses.)Ĥ. This is our typical recovery method, which will be how every recovery task will finish.ġ. You should always familiarize yourself with the equipment you are working with, but I’ve included a simple diagram of how to connect the required equipment and a “step-by-step” guide for the newer techs. There are two typical methods, direct recovery and push/pull. I’ll cover all this at the bottom of this article, but we’ve got to start with the basics! How do we recover? I had a reasonably repeatable situation on my hands, and I had the opportunity to try all sorts of things: recovery cylinder size, hose size, hose type, etc. So it was time to install a single valve core in 50 operational units in critical spaces, each holding between 50 and 100 pounds of R-410A. Remove the cap expecting a valve core, and well. This was a possible disaster for an unsuspecting tech. This all originated from some personal trial and error when an air conditioning manufacturer I worked for had a recall, a missing Schrader core at the receiver service valve ( king valve) of all things. If looking to connect with a strong culture of HVAC technicians, check out the subscription-based HVAC Know It All app. I often see new techs asking how to recover or experienced techs asking how to recover faster, so let’s take a look at both. Step by Step Refrigerant Recovery Process
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