HVAC recovery system hook-up and hose purge
April 8, 2010 by Air Phase - All About Air Conditioning
Filed under hvac
I show how to connect and purge hoses when recovering refrigerant from an a/c system. Please do not be confused by the R-410A gauges. My R-22 gauges were broken and I was forced to use my R-410A gauges.
@viperspeed172019 Thanks for watching. You can add the initial charge to the system by the liquid side. Then you have to fine tune the charge by vapor in the suction side.
@ariotto1 Its really simple. Cylinder upside down and at a lower level that the compressor. Bleed liquid refrigerent up to your gages. Then open the high side all the way and walk away. I get a smoke. Come back close off the valve and fire up the unit. Only a few time in 20 years have had to top off with vapor. Bur that was easy because my cylinder line was full of liquid. Thid will work on any HVAC system.
hey doc z!! awesome videos….question for ya ….i see you add freon to this system from the high side …liquid…do you recommend this practice whenever you charge a system??
thanx….your vids are killer!!!!!
@petesque can u explain that trick better? i really would like to try that!
@Khmerica26 Tonnage is a measurement referring to BTU. There are 12,000 BTU per ton. See my HVAC Safety video to see what kind of equipment you need to do the job.
@DrZarkloff Thanks for responding back. What is a tonnage? I haven’t learn that in class yet. So does that mean I need a recovery charge unit to get the job done? What equipments do I need?
@Khmerica26 Take the tonnage and multiply it by 2. Then charge that amount with liquid for your static charge.
@DrZarkloff can you please tell us approximately how much percent you need to fill from the high side and then from the low side after switching on the system?
@Khmerica26 I’d replace the temperature control for a digital control. They’re easier to keep the temperature where you want it.
Hi Dr z. I have a question. I have a soda machine that isn’t working properly. If I leave the unit plug overnight the soda can inside will froze so I have to unplug everytime I leave for the day. I ohm out the temperature control and is good. I am taking HVAC courses right now. So what can causes this to happen?
Thank you
@petesque Cool. I know what you mean. I just like to make sure that I don’t over or under charge on package systems.
Dr Zarkloff.
I like the videos. The guy who trained me was 70 years old and he taught me a trick that I have used in my 20 year career. If you can charge a system as you did here with the cylinder below the compressor and after bleeding you hose to the manifold. You can just open the high side and go take a break. I have done this for years and when I come back and run the system everything is so darn close I don’t mess with it.
@jonjon2121nyc Good eye. I probably did all that off camera. Some things sometimes slip by when filming.
@kingstonblackboy I wish that I had started my HVAC career when I was 22.
Hey doc. I live in Los Angeles CA and I’m intrested in HVAC I’m currently inrolled in Hvac classes for my california certification… My question is, is now a good time to join the trade??? I’m 22 years old.
Dr Zarkloff i watch all your videos all the time! I do HVAC myself and i think u screwed up a lil at your last purge connection before the cylinder on the discharge side of your recovery unit . shouldnt the hose have been attatched to the cylinder where from there u couldve bled the air from that hose before opening up your tank? you had the last yellow hose in your hand and then hooked it up to the cylinder and opened the valve. did you pull a vacuum on that tank? Good stuff though!!
@vabeach1989 The system need to be off when you put in the liquid static charge. Then you turn on the system to finish the charge with vapor the the low side.
Does the system needs running while giving the initial static charge on the hi side? Also, how much initial charge to give a system before finishing up the charge on the low side?
Do the system needs running while giving the initial static charge on the hi side? Also, how much initial charge to give a system before finishing up the charge on the low side?
@Wallabydam You need to charge the initial static charge by liquid in the high side and finish up the charge in the low side.
so does it matter if you charge form the high or low side?
@redhot916spd I was replacing the compressor.
great vacuum, why did you pull the existing refridgerant out, was there a leak? if so could you tell if there were any noncondensables in it?
@BiggDoggSoCal Yes.
Did you know how many ounces it holds by checking the data plate?