This video is brought to you by spore'ln quality, integrity and tradition. Okay, so we're on the roof. We've got a service call today on a walk-in cooler, that's getting way too cold inside the box, so we're gon na open it up and see what we can find. So this is an interesting one: we've got a walk-in cooler and the complaint is that it's getting too cold in the box check this out.

Thermostat says 32 degrees. It said 29 when I walked in here. I'm gon na do is test the thermostat for you. So we've got 115 bullets coming into the thermostat and then it's jumping off of the power leg into the common circuit across the contact were open.

So the thermostat is not sending power to the solenoid. No okay, but check this out. Solenoid valve is stuck open. Look at my liquid line stamp at my suction line - town, it's ever so slightly bleeding by on the suction line.

Ever so slightly, it's not for 48, hey by the way, my last job - that's not good negative, but ever so slightly, it's bleeding live and you can see by the thing frosting up. I was bringing the block step away cold. So we've got a bad solenoid valve. It's it's got something stuck inside of it or something like that.

All right, so we've got the system pumped down. We've got our new valve in there we're gon na go ahead and sweat this new valve. In because of the tonnage I went with a half-inch diameter or connections, but remember it has nothing to do with the connection size. It has all to do with what the valve can handle and I had a 3/8 valve, but it could only handle one point.

Six tons - and this is like a two and a half ton system, so we want to make sure that the valve you also don't want to go too big also, but this valves perfect. So so it is, you know, common to see, bigger connection and just reducing with fittings. So you can see, we've got a half-inch valve and I'm reducing it down with a half inch by 3/8 bushing. So we're going to get that put in there real, quick and then we're going to change the thermostat okay, so the new solenoid valve is installed.

We went ahead and used it as the junction box now so there's wire going in wire going out. We put a key to therm temp + defrost controller in there. We've still got to mount this sensing bolt properly, put some more zip ties and clean it up right now we're in an anti short cycle delay, because I tested the thermostat and turned it on and off, and so the temperature controller is basically delay. So it'll turn on here in a minute.

Our vacuum is just about done: we'll go up there and check on that right now, okay, so we got a little peculiar setup going on here now remember: this system is pumped down so the refrigerants stored in the receiver and the compressor. I'm not saying that a vacuums not important, but what I'm saying is is that there's still refrigerant in the system there's still refrigerant in the oil of the compressor, that's slowly boiling off, so I'm not as hyper critical about a vacuum on this system. Okay, I do have hoses going directly to here, but what I did was I went ahead and connected my gauges to the extra port. Okay and I was kind of cheating and using them as a micron gauge.

I realize that's not the most effective way to do it, but again, I'm not so worried about the vacuum in this system. You're never going to achieve a perfect vacuum on a system, that's clumped down and the reason. Why is because that valve right there, the king valve, is never a hundred percent leak, free, you're gon na get refrigerant. If I left this vacuum pump on here for two days, there probably wouldn't be any refrigerant left in the system when we're done, because eventually it'll pull it right through those valves.

So with that being said, we're going to go ahead and close off these gauges. We're going to close the gauge ports, be crts, the vacuum core Google tools and looking at our micron levels are actually kind of dropping right now, so again, I'm not so worried about it. We're not seeing a huge thing. I put a new liquid dryer in here too.

I actually didn't have the right dryer. I just had a buy flow which will work. Fine, so just got to make sure same thing with the dryers. You don't size them for the line size you size them.

You look at the line size and then you also look at the tonnage that the dryer can allow through it. So this one had plenty of RAM in it. So, okay, we're gon na go ahead and open the system up, open the king valve and let the refrigerant through and watch the unit operation. I don't know if any of you guys caught it, but I actually have my hoses hooked up long.

I had made that mistake when I was doing the back, you might have the low-side hose on the liquid line in the high side. I was on the suction line, but it didn't matter for the vacuum, so I switched it over after I opened the system up. The positive pressure when I switched it over good running looking good, that's it. I had already earlier checked the receiver level.

It was good but a headmaster. Okay. So the complaint was the walk-in. Cooler was getting too cold and it was kind of an intermittent one and in all actuality we had this happen a previous day before another tech was there and they said hey, my walking cooler is getting too cold and we couldn't find anything wrong with it.

It was an intermittent issue: okay, and what we found obviously, was that when I got there it was 32 degrees in the box when it was set for 38, okay and immediately I kind of had a hunch. So I jumped right to that. Silla Knight valve and found that there was a temperature drop across the solenoid valve and then also put my low side gauge on the evaporator. Since I was right there and noticed that I had pressure so thus Illinois valve was getting stuck open.

There was more than likely something stuck inside the cylinder valve now the valve that was there before you know had been there for a very long time. So I don't think that there was a sizing issue with that valve, but who knows okay, so anyways? I went ahead and replaced it got the unit operational customer was happy. You saw that you know a couple different things like the the solenoid valve that I installed had bigger line sizes on it. Okay - and I explained that is very typical, because you sized a valve based off of the pressure drop and the tonnage of the system - okay, and so essentially that valve by up sizing, it made it well, you know it basically fit in there better with what I Had in my truck that was all I had, but it was a better valve choice than going with a really small one.

Okay, the other thing was was the liquid drier? I didn't have a standard spoilin, you know liquid line filter drier, like I usually use. I just happen to have a buy flow for a heat pump. You know a Mersenne drier, so it worked that the tonnage you know capacity. The dryer was still there.

So you know you can't always do everything perfect. You know. Sometimes you have to do what you have to do to get the customer going. Okay, so it is what it is.

It was either that or not change the dryer. You know I'd rather put that buy flow in there. You know, and then just you know that it worked fine, essentially, okay. I really appreciate you guys taking the time to watch these videos.

You know any questions you guys have send me. You know, put a comment. Send me an email, hvac, our videos, no more put a comment in the YouTube video. I try to get to everything, I'm always interested in your guys's feedback, whether it be good or bad.

If you have criticism for me, put it in the YouTube comments, I don't care, you know I got tough skin, I can take it so really appreciate it and we will catch you guys on the next one. Okay.