Refrigerant The recuperationI often see new technologies asking how to restore – or even experienced technologies asking how to restore faster, so let’s take a look at both. If you want to connect with a strong culture of HVAC technicians, check out the subscription-based HVAC Know It All app. Read: how to restore freon This all stemmed from some personal trial and error when the manufacturer I worked with recalled, a Schrader went missing. core in the collection service valve (valve king) of all things. This is a possible disaster for an unsuspecting tech, take the cap off and expect a valve core… No fun. So it’s time to install a single valve core in 50 units that operate in critical spaces, and each of them holds between 50 and 100 pounds of R-410A. I ran into a reasonably reproducible situation at hand and I had the chance to try all sorts of things: recovery cylinder size, hose size, hose type, etc. I’ll cover all of those. This is at the end of this article, but we’ve got to start with the basics!How do we recuperate?There are two typical methods of direct recovery and push/pull. You should always familiarize yourself with the equipment you’re working with, but I’ve included a simple diagram of how to connect the necessary equipment as well as “step-by-step” instructions for newer technologies.Straight The recuperationThis is our typical recovery method, and this will be how any restore task will end.1. Start closing all valves (recovery cylinder, recuperator, manifold, hose.) 2. Set up hose as shown in diagram.3. NO/TARE refrigerant scale.4. Open faucet valve, core remover valve or service valve.1. –The below steps will change with your the recuperation machine–5. Set the recovery machine to restore. Open the high wall of the manifold for liquid recovery. PURGE THE HOSE OF THE AIR Loosen and open the hose connecting to the recovery tank until refrigerant is present and then re-tighten. Fully open the steam valve on the recovery cylinder. Read more: how to get rid of bees in the chimney9. Turn on the recovery machine. –The below steps Candlestick it is in Standard arrive most the recuperation machine-ten. It may be necessary to adjust the high side valve of the manifold to throttle the flow of refrigerant into the collector to prevent liquid from slipping.11. When liquid recovery is complete, fully open both the high and low side manifold valves.12. Many recovery machines will shut down when the system reaches vacuum.13. BUY RECOVERY – this can be quite specific – so check the manual if you are unsure.14. Close all valves and restore complete!Push / PullIf the system has 15 pounds or more of refrigerant, this will be your faster choice. The more refrigerant the system holds, the more time you save. Tip: Using the inline viewfinder during push-pull retrieval will allow you to visually determine when liquid flow has stopped. 1. Start closing all valves (recovery cylinder, recuperator, manifold, hose.) 2. Set up hose as shown in diagram.3. NO/TARE refrigerant scale.4. Set the recovery machine to restore. PURGE THE HOSE OF THE AIR (this is done a little differently than in live recovery.) one. Open the liquid line service valve or core tool, then loosen and open the cap of the hose that connects to the liquid port on the recovery tank until refrigerant is present and then tighten it again. b. Open the steam line service valve or core tool, then loosen and open the hose that connects to the steam port on the recovery tank until refrigerant is present and then tighten it again. Turn on the recovery machine. Read more: How to say yes in Russian7. When liquid recovery is complete, move on to Direct Vapor Recovery. The current, let’s speed, velocity it up….Valve Core Eliminate Tools• If you’re just going to change one thing – this is it! If you’re having trouble pulling through the valve cores, get two of these. They will even help speed up your evacuation.The recuperation Cylinder• Ensure that the cylinder is clean and has been vacuumed to 500 microns or less. And NEVER fill more than 80%, this allows refrigerant expansion. • If a larger cylinder is actually used, this will result in faster recovery.Hoses• Avoid hoses with “anti-blowback” or “low loss” fittings. • Standard tubing is ¼” – using larger diameter tubing will help you recover faster, these are often marketed as “heavy”, “charged” or “vacuum” tubes. • Use as short a tube as possible.Temperature• Cool the regenerative cylinder – this will reduce the pressure of the regenerative cylinder. • With many collectors, you can use a fan to draw air through the tank. • Water will work better, but you will need a stream of water • Cool the refrigerant! This tends to be your best bet if you are dealing with large volumes of refrigerant – heat exchangers are available just for this purpose.Filter It!• If you suspect the system refrigerant is dirty, use the inline filter desiccant at the inlet of the restorer. just about all apps. Try a few of these and see how they work for you. Dan ReggiHumber College ProfessorFollow HVAC Know It All on Instagram, Facebook, YouTube and LinkedIn and TO LISTEN to HVAC Know It All PodcastSave 8% when purchasing at TruTech Tools with the know code tool (fluke and Flir products not included) Read more: how to calculate highs and lows
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