This video is brought to you by spore'ln quality, integrity and tradition. Alright, today is an interesting one because they called me saying: they're, walk-in, freezers at 30 degrees and the fans were not ready. They did not want me to come out last night, so I came out the next morning today and the walk-in freezer is not quite completely down to temp, but the fans are running. We're gon na have to go up onto the roof and try to troubleshoot.

An intermittent problem is what it seems like condensing unit compressors run in it's like last looks to be clear. An inch fan motors are running so we're just gon na have to go through everything. I'm gon na put some service gauges on this guy check the defrost clock alright, so everything is running at the time cyclases clear. I confirm that the head pressure control valve is currently bypassing, so I've got hot discharge gas, it shut off the flow coming out of the condenser and it's bypassing refrigerant into the receiver to keep the head pressure up.

So system is running right now. It's 10 degrees. In the box you see, the dry bulb temperature up there. I don't have any temperature clamps hooked up running the clear sight, glass we're just gon na watch.

This thing operate for a few minutes time. Clock doesn't really it's not too far off. It doesn't turn very well, it's kind of gummed up with there, so we're just gon na watch. This thing operate for a bit and see if we see anything jump out at us.

That would think we think there's a problem. We're gon na watch the cut in and cut out of the pressure control, sometimes not gon na, be an issue like I said I think we're dealing with an intermittent problem here. So so that's interesting. My system just pumped down that and my low pressure control is not accurate because it's bringing the box 10 or the box low side pressure down to low.

So, let's see what it turns back on. We might have a temperature controller issue because it's only ten degrees in the box and we should be getting down to negative ten. They keep ice cream in this freezer. That's interesting! We're not a defrost! So there's nothing there that caused that issue.

Defrost clocks, still in refrigeration mode, you can see by the green light right here, so I think we're pumped down all right. So it's certainly cold in here, just not cold enough. The temperature controllers back behind the box, I've seen these where they vibrate up in temperature. So I'm gon na climb back there, so this temperature controllers back here looks like it's set for about five degrees.

I'm gon na try to adjust it see where it clicks at that's what it is, and it's also going bad because it's cycling negative five. It's a positive 10 in here, so we're gon na crank this guy down. You can see, too, that this control wasn't played with because they have this cap on. It was payment asked about rock, so this says happens from vibration over time.

These things do this kind of John. This actually looks like a factory control. To be honest with you, don't think this has ever been never been changed before, so it is certainly getting colder. Now, inside that box, I'm gon na go ahead and watch it for a little bit make sure it doesn't have something else going on, but I have a feeling it was just that temperature controller, but I am gon na talk to them.

I'm gon na suggest replacing that control putting a digital mounting it on the wall, so we don't have vibration issues and then also I'll adjust the pressure control right now, but I'm gon na suggest that we go ahead and replace the pressure control, also cuz, that thing's Out of whack, but I mean I can get by by adjusting it, but you know it's it's starting to go bad. So we'll do that I'll, be honest with you! This customer is like they love to replace their equipment, so I wouldn't be the least bit surprised if they say no and then just have us replace everything, but that's on them. They order their own equipment and get like crazy, good prices and stuff. So they like to replace them and get a warranty with it and call it a day.

So I also changed up the defrost ID on there. Why I put even defrost throughout the day, basically every six hours, and then I threw one half-hour defrost in the middle of the night, the ex terminals hooked up. So you know a 45 minute. They had a 45 minute defrost on here I mean I guess I can leave it at 45 minutes, but I don't know I just forced to have it.

I put him at half an hour, I mean it is time and temperature terminated. So I guess 45 minutes really isn't gon na make much of a difference, because it's probably gon na time out in 20 minutes, but so yeah, I'm just gon na leave it up to half though, but like I said, I threw that extra one in the middle Of the night, so I'm just watching this thing, this thing's tracking and keeping time so far so we'll see you know, I get a lot of questions about grassland versus Paragon, defrost Fox and I honestly think both of them have good things and bad things. The grasslands are great because you can add these extra defrost in the middle of the night. You can make.

You know the defrost as long as you want. So you can do an hour here, 10 minutes or 15 here half-hour 40. But you know you can do all kinds of different stuffs with the Paragons you. Basically you adjust the center dial to the defrost setting and it's that for every defrost, the Paragons.

Usually, what I do is is I leave what's originally in there. Obviously, this one used to be a Paragon you can see by the bracket and it's got the conversion kit to make it a grassland, for whatever reason we did that, but I tend to leave if I was to change this clock. Unless I had a major issue with it being gummed up with sand, which this one has a little bit of dust, but it's not horrible, I would change to a Paragon, but I tend to lean towards the grasslands more. If I have the option just because I like them, I know a lot of people don't, but I really don't have that many problems with them.

So so this was a service call on a walk-in freezer that wasn't working properly. But, like I said in the beginning of the video, is a little strange because they said it wasn't working at all, or it was really warm. When I got there, it was kind of half-assed working okay, but I noticed it just wasn't quite cold enough inside the box. Okay found that the units temperature controller was going bad and that it sometimes happens on these ones where they mount the temperature controller on the coil over time.

The vibration adjusts the control, but then also the the setting on the control like the control is going out of calibration also because, even when it was set at negative five, it was only maintaining positive ten inside the box. Okay, so to compensate temporarily, I adjusted it colder and got the unit to come down to temperature and then went to the customer with a big picture item list and that customer actually decided to go ahead and replace that equipment. Like I'd mentioned, I thought they would and we've already sensed that equipment over to new heat craft stuff that they supply so got the unit operating. Another thing I wanted to point out, if any of you happened to catch my suction pressure.

My suction pressure in this was quite low. Okay, and if you looked at the saturation temperatures, the saturation temperature was really low too. Typically, if those boxes are does they're typically designed for about a 10 degree, evaporator TD and that's the difference between the return air and the saturation temperature of the refrigerant okay, I think this one was running something like almost a 20 or a 30 degree TD. Okay, what happens a lot of times, especially with cold zone equipment, as I tend to notice that the equipment is oversize? So in this situation they had an evaporator that was sized for the load in the box, but the condensing unit was almost a ton bigger, so they had like a three horsepower condensing unit running that evaporator and it was basically oversized causing us to low to run Lower suction pressures, okay and that's why we had such a low suction pressure on that unit, and that you know, sometimes you got to learn how to diagnose with that kind of stuff.

You can't always go in there with a mentality of this system should be working like this. Yes, you know, you do have those things in mind, but then you also have to be able to look and notice trends too, and I noticed that whenever I'm working with cold zone or rustle equipment, the condensing units tend to be slightly oversized also on cold zone. Refrigeration racks, I noticed that a lot of times to that we run lower head pressure because they tend to oversize the rack condensers, just something - and it's not necessarily a bad thing, depending on how much oversized it is. So you know you just got ta kind of notice, trends and and just kind of try to remember things, and it helps you I've, always in my head, whenever I'm working on anything cold zone, I always accept the fact that my head pressure might be a little Bit low, my suction pressure might be a little bit low and it's just one of those things.

Okay, so that's pretty much it on this one, like I said, we already replaced the equipment, you know and everything else was going good. I got the customer operating that day by just adjusting the low pressure control. You know and that's it. I really appreciate you guys taking the time to watch these videos.

Do a favor leave me some feedback down in the comments, and you know, let me know: do you see something that I did wrong? I'm always I'm always looking for feedback. So give me information. Let me know what you think: okay until next time: okay.