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How's it going and welcome back to the Channel in today's video we're going to Be servicing a package unit where we Came out probably about a month ago Where the system wasn't operating Properly and it was a little bit lower On charge we were super busy so we just Topped it off at the moment so today We're coming back we're going to Investigate where the leak is coming From hopefully we can actually find it Get it repaired and weigh the charge Back in so that way they're good to go This do some work all right so this is The unit we're working on today It's an Ameristar heat pump package unit I actually installed this I think it's Been a couple years now so Again we came out Um about a month ago and just topped it Off to get him going and we're just now Finally getting back to see what's going On And to be honest with you my gut feeling Is that it was one of the straighter Cores leaking and then once we hooked Our gauges up to top it off it probably Reset it but because we haven't had any Issues whatsoever But um We'll find out here in a moment so what I'm going to do Is I'm actually going to go ahead and Recover all the refrigerant out of the

System And uh and go ahead and do a really high Pressure test so we'll go ahead and hook Up the dry nitrogen and do a good Pressure test and uh instead of trying To waste a bunch of time trying to find A leak with the electronic leak detector So It holds five pounds And five ounces so and what I'm going to Do because I don't know how much we lost And I don't know because it's a blended Refrigerant I don't know which part was Lost so what I'm going to do is we're Just going to recover everything that's There and we're going to weigh in virgin Refrigerant so we know the mixture is Going to be right for the new Refrigerant so Let's get started All right so what I'm going to do is I'm Actually going to weigh how much Refrigerant that we are we're going to Be removing To give me an idea if If the system has been leaking from when We were back here last time even though I just weighed the charge in and I'm Sorry to weighed in even though I just Topped it off last time but we got the Pressures where they were supposed to be I don't know that if it was perfectly Charged if it was slightly overcharged Or slightly undercharged I don't really

Know that So anyhow by weighing what we take out That's going to give me a good Indication of how close we are to the Full capacity of the refrigerant that It's supposed to have you know it's just Another way of double checking to say Yep we are one pound low two pounds low Whatever and we know we still have a Leak that we need to be looking for if It's pretty much closed spot on then we Might have gotten lucky and it was a Straighter course so but anyway that's What I'm going to do is go ahead and get This thing Uh recovered and weigh all of the Refrigerant that we take out All right so this is fieldpiece's latest Refrigerant scale the sr47 Job Link Scale so this thing comes in a really Nice carrying bag with a shoulder strap Which is really nice but the scale Itself is um it's super rugged and Robust you can tell by looking at it With this this non-uh skid platform here For the the actual tank so it won't just Slide around on you but on this Particular model you can really see that They just beefed up the the device here It's really nice and of course you got The built-in display where it just comes Strapped into the back now with this Particular model compared to the last Version

This is a lot smaller and it's really Clean looking I really like it and not Only that it has this adjustable Magnetic Mount to it so now you can just Mount it to wherever you need to whether It's going to be on a vertical Orientation or on the side just like This so I really like that so this scale Can hold up to 252 pounds of weight it Is water resistant and it's also Job Link compatible which means you can Wirelessly sync this up to either your S-man gauges or the joblink app with up To a thousand feet of wireless range Which is fantastic All right so our empty tank is 17.1 Pounds Which typically it says it on the actual Tank anyway but I'm gonna go ahead and Zero that out So now we're starting fresh Love that magnetic uh remote there All right let's get this thing running Foreign So we are down into the negatives a Little bit And it looks like we got a little over Three pounds So that's a little over two pounds shy Of what it should have So I'm going to go ahead and disconnect Everything Remove the tank zero out the scales and Then re-measure I want to see if this

Thing weighs 20 pounds I don't know why I do that it's just something I like to Do Just to make sure that everything is Reading correctly 20 pounds on the DOT So yep we did remove three pounds So now it's time to pressure test with Some dry nitrogen And let's see what we can find When it comes to pressure testing what I Like to do is check the name plate and It'll tell you what the factory design Pressure is So on this one we have high side is 550 And the low side is 250. But because this is a heat pump Uh the high side is actually on both The outdoor coil and indoor coil so you Don't really have to worry about over Pressurizing As far as the 250 and the 550 goes so What I do is I'm going to go ahead and Pressure test a 550 and see what we got Let me go ahead and put this in a test Tightness Mode All right so I'm going to let this run For a good 10 or 15 minutes And it's going to calculate how much psi That we drop if we do which we should In that time period so now Um sometimes these things will drop Maybe like a half a PSI that's not going

To be a leak these things are so Sensitive so at 550 PSI in 15 minutes I Mean we should see quite a few PSI drop If not even more than that when you Actually have a leak so keep that in Mind if you're using digital gauges is They are very sensitive and you're able To read one tenth of a PSI so Um typically with a um you know analog Gauges or compound gauges you wouldn't Even be able to notice that on the uh on The gauge itself so just keep that in Mind Yeah so if you guys are in the market of Picking up a refrigerant scale I do Recommend the Sr47 job link scale I really do like This scale again it's super rugged and The remote on it has that magnetic base To it which is you know just something That simple Is very handy to have that way you've Got it Right where you want it it's not going To fall and get damaged and then of Course having it to where you can Put it in the back side to store it Where you don't lose it it's a fantastic Idea as well But just like anything that Fieldpiece Makes it's just super high quality and You know you're getting a good product So again if you're in the market for Picking up a scale check out the sr47

All right it has been 15 minutes And it's only dropped one PSI it's Actually been going from 0.9 to 1 psi Back and forth So again in my mind at 550 PSI if we had A leak it would be dropping down Consistently so That's where I'm a little bit confused Because We were two pounds shy when we recovered All the refrigerant And now I'm not quite sure why there Isn't the system does not have an Accumulator so it's not holding Refrigerator anywhere that's trapped Um at least that I'm aware of so if you Guys have any answers to that or any Recommendations on why this possibly Could be happening Uh leave them down in the comment Section below I'd appreciate it but at This point I mean I'm pressurizing it to 550 and it's held for uh you know over 15 minutes now so I feel good about it I Guess on a secondary way to check is I'm Gonna when I pull the vacuum with my Micron gauge we'll make sure that it Holds a Decay test But other than that I'm just gonna rock With it and get this thing charged back Up and just go from there All right so we're going to go ahead and Test the oil the pump real quick before We get started just by hooking up a

Micron gauge and making sure that it Gets below You know a hundred microns And we know our oil is still good to Move forward All right so what I'm going to do is I've removed the core on the low Pressure side so that's going to be Attached to the biggest side of the System as far as the largest diameter Piping and then I went ahead and Replaced the core on the high side port And then I'm going to go ahead and hook Up my micron gauge to that side and We're using a three-quarter inch Diameter hose vacuum rated hose with a Half inch connection at the pump so this Is going to flow very nicely in least Amount of connections as possible is Best when it comes to pulling vacuums so That's why I like to do a one hose setup Especially on smaller systems and not Not to mention that this particular area Is a little bit tight to get everything In here so this should work out well All right so everything's connected this Valve is shut we're going to go ahead Open up the gas ballast and turn it on So change of plans I decided to go ahead And hook up both hoses Because it was running kind of slow and I think it just sometimes it's best to Connect on both sides Um

That way if a valve or something is kind Of closed down we'll be able to pull Equally from both sides so anyhow That's just what we decided to do It's a little tight but we got it And right now we're Pulling down so Obviously doing it this way You want to let it run for a good 15 or 20 minutes And then valve off the core tools that Way you can get an accurate reading on That micron gauge All right so it's been a little over 25 Minutes now We're at 600 microns and uh it is shut Off there so that is reading true Microns on the system not from the Actual vacuum pump So I think I'm gonna go ahead and uh go Into the Decay test now Make sure that it That it holds and we should be good [Music] Now we wait about 10 minutes Okay so we got the vacuum pump removed And all the hoses and it's been about 10 To 15 minutes now And we went up just a few microns so I'm Feeling pretty good about this we're Gonna go ahead and hook up the The manifolds and weigh-in five point or Five pounds five ounces And get this started up

Foreign Foreign That's going to complete today's video Guys I really hope you got something out Of it if you have done something Differently on this particular repair Let me know down in the comment section Below but give it a thumbs up if you Liked it if you got something out of it And subscribe if you haven't already Until next time we'll see you guys later [Music] Foreign [Music]

This post may contain affiliate links which means I may receive a commission for purchases made through links. Learn more on my Private Policy page.

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