So we've got a walk-in cooler here that we noticed there was some issues when we were doing the preventive maintenance. We noticed the flashing sightglass and some other issues I'll show you once I get up there onto the roof, but the evaporator is free of ice. It's got a little bit of lint on it, but other than that. It's okay, so we'll go ahead and jump on the roof and take a look at what we can or I'll see what I can show you Kim looking on the roof set up some lights because it's a really dark.

This is like in a parking structure and back it's like it's very dark in here hard to work, so I set up some lights. The condensing unit was running when I got up here, I'm gon na go ahead. I went ahead and shut it off so that we have to get all the panels off before it pumped down, so I still haven't even put my gauges on, but there's oil everywhere. This is just condensation, but this is all oil oil everywhere.

In this thing, all over the liquid line - and it's not just spray and sleeping all over that service valve - I always want to try to catch that stuff before probably put the caps back on and do a quick leak check. Real quick because I'd already taking these caps off, but if I put them on a little, if you do a weak check and see if I can't pinpoint it before, I disrupt all the covers and caps so that Valve won't shut off completely and it's leaking out Of the receiver and then it's getting blown by the condenser fan blood all over everything over here, because these traders are leaking all the rubber o-rings are in everything actually haven't checked this one. That's traitors leak, so so, okay, we're gon na go ahead and continue on with the diagnosis now. Okay, so the diagnosis we had on this guy was that we might have a weak suction valve and a compressor.

So, first off I don't have my temperature clamps on this, but we are flooding back for sure. Okay, the Box temperatures about 41 degrees, so that TXV is just flooding this thing or sweating like crazy. The next thing is is that we have high suction pressure low head pressure: okay, it's currently 80. So if you just rule of thumb, 30 degrees above ambient 9110, our liquid saturation temperature should be you know, 110 somewhere in that range at least 100.

So we should be running around 250 240, high-pressure, okay, our suction pressure right now should be a lot colder. If you look at that not saying only our suction or vapor saturation temperature is about 35 degrees. It should be: let's see if it's 40 degrees in the box, it should be about 30 or 25 degrees, vapor saturation temperature, okay. So now let's go ahead and do now very, very important that we make sure we're not on this side of the valve.

This will only work if we're on this side, and this is a crude way to test what I want to test. We're gon na go ahead and pump down the suction side of this guy, see what happens. Okay, so I'm bypassing the pressure control to get it to point to a vacuum. If it will point to a vacuum, Copland actually doesn't recommend that you do this anymore.

They used to be on the semi-hermetic, so you could test a compressor by pumping down the suction valve and you're testing the bowel plate, but I'll uses us the secondary diagnosis so about negative 5 negative 10 inch. Let's see what happens here, it's not horrible! If that was extremely bad, it would piss right up, but this suction line is getting warm because the discharge gas is bypassing the compressor, so it is leaking by a little bit again. You don't want to use this test as a complete diagnosis, okay, but I definitely think there's something going on with the expansion valve. Also it's flooding - and I had someone here on Friday and they adjusted the expansion valve and we got no response out of it.

So my theory is is that expansion job has been flooding for a while and it's weakening the suction valve in this compressor. Okay, so I pulled my gauges off so altogether. We've got a weak suction valve. In the compressor we've got an expansion valve, that's flooding.

We've got a leaking receiver valve, that's not repairable, and then also I noticed over here when I looked at the defrost there's only two pins in the defrost that I'm wondering what the heck. Why and it's really hard to turn so got that defrost cocktail. This is a situation where, more than likely, we'll put in a Paragon clock. You know I've been having some comments in my videos about the grassland bushes, the tarragon and I like them both, but they both have their weaknesses.

My personal opinion is prefer the grassland clock, because you can do multiple defrost different and you can do you know 45-minute. He cross the middle night 15-minute. He fastened that all the day with a Paragon and at least the mechanical one you have to do the same. Defrost duration, all throughout, but these are susceptible to sand and dirt, and it's really sandy up here, you can see, there's just sand everywhere dust whatever so it'll get gummed up, burn marks on them too.

So we will. We will quote this too, depending on the price. I might even just quote a condensing unit. Does if you look at the big picture, compressor receiver time, clock I'll, look at the price difference to see how much more to be to change the condensing unit, so again big picture and then we'll go downstairs and look at the evap.

If I already have the information, so we can pour dat exp for that. Also something to think about is when I was all done. I went ahead and put my log on all the threads before I put the caps on and then clean the night log off. Okay and if you notice sigh class is slightly flashing too, but I'm not going to add any more refrigerant right now because of the weak suction valve it's working at the moment.

So we'll quote everything and then so we're just. You know again. Looking at the big picture here, you know just because I show it a tip, you know like checking the suction valve by pumping down the suction line. On that doesn't mean that's gold, and you can't, like I said, Copeland, doesn't recommend doing it.

That way, that was just a second way for me to check my letter confirm my suspicions by looking at my refrigerant pressures, you know, and then I pumped down the valve and verified that it wouldn't pull down very well and it leaps back when it does so. You always want to look at more than just one way to diagnose things, because you know what happens if this valve is leaking by right here. If that valve is leaking by, maybe the pressure could come back into that line. You know my my suspicion was confirmed when I grabbed this late for this suction line, and it was getting warm because that means that the hot discharged gas was bleeding back through the compressor.

So you can't always just you know, run with one thing. You really got to stop and think about your guys's diagnosis here, so I ended up leaving after that last clip. We got the unit operational or it was working submitted, a quote and got approvals to to do everything. A couple days later we got a service call.

We hadn't completed any of the work, yet we got another service call on their walk-in freezer and their walk-in cooler, and what I found when I got there was they were both going off on high head pressure and thermal overload you'll see in the clip. Why? I temporarily went downstairs and went ahead and replaced that expansion valve to get the produce walk in operating better to stop that valve from flooding. We still have to get an electrician involved to fix the high temperature issue, of which you'll see in the clip and we'll go from there. So this is an interesting one, I'm up on top of this little catwalk, whatever you want to call it with all this equipment, 121 and climbing, and none of my fans are running the cooling fans for this area up here.

So these are the disconnects for these fans and none of them are wired or none of them have power. So I'm gon na go down to the restaurant and try to find these breakers see what we can do took this panel cover off and look at this mess now looks safe, holy crap. Let me check and see if there's even any power in there and then we'll go so I've got I've, got no power in this mess and what it looks like I'm almost wondering if this has ever s been hooked up, because this restaurants only been here for About three years two years - and I have a feeling - I've never seen these fans work, but I don't know that I've ever been here in a heat wave like this. But if you look at the wires coming in those were pulled down because someone yanked on those wires.

It almost looks like someone pulled from down at the panel or something with a polling device and just yank those things right off the din rail in the back. I don't even know it looks like I can safely turn them on, but I don't even know I got ta go. Try to find this panel KB, I turned everything off and then I went to every motor starter and I tripped them all. You can just manually trip them by moving the little T right here, I just say, moved it over with my screwdriver on every one.

So that way, if I do restore power nothing's going to turn on until I'm up here so we'll see okay, so I came up under there walkins, which is on the other side of that wall that I was working on and I'm trying to find this conduit. It's coming through the wall, so I know there's a line set there. I found a line set on the roof and I kind of got a bearing, and then I knew that about six to eight feet. This side of that line set is where that electrical box was at, and this is what I found so this building's operating without those cooling fans, so the service call is, is that their equipment wasn't working the walk-in freezer just started working a few minutes ago, and It's slowly coming down to temperature.

Well, the problem is: is that they're going off on high head pressure because it's cooling down now, you know so earlier. In the day today we hit 110 and it probably hit a hundred and thirty hundred and forty up in that mezzanine. So they got to get an electrician involved in this. This is gon na be a big deal.

Those fans need to be hooked up, ASAP that equipments just falling off than that. So I'm gon na do what I can to get their produce, walk and running because they called about two things: a walk-in freezer which they said is already coming down to temperature and then a produce walk in the produce. Walk-Ins I like 50, so the produce walk-in. I already know: we've got a compressor with a weak, suction valve and it's low on refrigerant, so I'm gon na see if I can't top it off and get it operating half-ass.

Okay. So let's do a little recap. We were here doing a preventative maintenance. We found some issues with their produce, walk-in cooler.

We went and had a technician out there. He gave me what he thought was going on, which was a weak suction valve. In about t -- xv, I went out for a second opinion. Just to double-check.

The diagnosis confirm that everything was correct, submitted a quote to replace the compressor, all the other parts that we mentioned. The t -- xv all that good stuff a couple days later, they approved the quote and in the meantime we got another service call. We found that the system was shutting off on high temperature thermal overload and it was going off on high head pressure, also their other walk-in freezer was doing the same thing. I found that the temperatures up on that mezzanine were reaching over a hundred and twenty degrees, and it wasn't even a hot at the time it was heating 120 degrees.

On that mezzanine, it was only like 95 degrees outside the the dot day we actually hit a hundred and twenty ambient. So imagine up on that mezzanine. It was getting ridiculously hot. They also have a seven and a half ton condensing unit up there for an AC system, and then they have for walkins and an ice machine condenser.

So all that is just pushing heat into that area and it's just getting trapped. We found that the cooling fans for that mezzanine were never installed there. Those cooling fans are basically from the previous tenant four years ago, so this restaurant has been running like this for a while I've just begun doing service work on this. It's only been one summer.

I think I did a little bit of work last summer, but we must not have noticed this problem. You know this is one of those things so they're gon na have to get an electrician involved to fix the cooling fence, and then I'm still going to go back and change the compressor, the defrost clock, the dryer, all that good stuff. I I did change the TX feed just to get them operational, so the walk-in was working when I left, but I can only imagine if we get another heat wave where we get those high temps, they're gon na have some problems. So there we go.