This was a service call on a Delfield reach in cooler not working on the bottom section, I found that the unit had a bad temperature controller and I replaced it.
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All right, today's service calls on a delfield little one door, reach in with the cold rail on the top. It's a refrigerated, cold rail. The complaint was that the bottom was not working, but the top was okay, so just doing a quick check out and move it outside, so I could work on it easier. The operative family is running first thing: I'm going to do is verify warranty status, so I'm going to call the manufacturer.
Particular manufacturer gives a three-year parts and labor warranty. So the first two digits designates the year, so this one very likely might still be covered under warranty. We're gon na call them depending on the ship date, so we'll call them verify that so anytime you're doing warranty work. You always want to call and get approvals before you start messing with calling the manufacturer under a five year compressor.
So I'm pretty comfortable with how this box works. So power comes in goes into the temperature controller for the rail and then goes to the temperature controller. For the bottom evaporator bottom evaporator fan motors around 24/7 is controlled by a thermostat that controls a solenoid valve this rail temperature controller right here, control this solenoid valve, which is for the cold rail. The compressor turns on and off via the low pressure control.
When the system solenoid belts, open or close, so there's a silhouette valve for the bottom section in the evaporator and then there's solenoid valve for the rail plug this guy back in and see what we can find very commonplace relief. Something is on such and stuff. Really such stuff too, the water rusts altitude, alright. So the next thing you're gon na do is open up the evaporator, so we've got our temperature controller right there and that controls a solenoid valve on the inside.
So I turned it off and I turned it on and I don't hear the song like valve clicking. So that's not a good sign, go ahead and pull that coil apart and testing that thermostat you telling that solenoid valve to pull in see if it's bad. What we're gon na do is test from one lead to ground. Okay, so here's the problem that I have.
I noticed that when I plugged this unit in, I didn't have a brown. That's probably why I'm not grounds, probably a really shitty ground right now we go. I tested to a flat to a fencepost. That's next to us.
We have 120 volts. So if I - and this is demonstrating what a bad ground would do and I'll show you guys the plug here in just a second. But if I take, if I touch my ground myself out and ground myself to something else, I'll become the path to ground and you'll feel nice little tingle. So we've got a hundred and fifteen volts coming into the control and obviously because we're gon na change it to audible, tone we're gon na test across the temperature control.
They have no tone and let me make sure it's on that temperature controllers turned all the way on and we have no tone there. We have tongue, but here we go so we have about temperature control. Now, whether or not that's the only thing that's bad. I have no idea, that's what I'm talking about. That's why I wasn't. I was only getting like 50 volts or something because it wasn't a good ground D and it wasn't grounded properly. So this is our temperature controller right here. Get this guy pulled out right now, better gloves on so when the hands don't smell, like a salad bar for the next week.
Call the term prep table funk, stinks to high hell that coil is pretty corroded and if it's not leaking right now, it's gon na be leaking soon. You want to make sure you get the numbers right so that way they make sense. You know the last backwards and then try and install the sensing bowl that way, it's not twisted up and going to rub out on something else to work on a lot of delfield the init. So I stopped a lot of their parts and we always go back with OEM parts.
I should say I try to go back with OMS as much as possible. This particular unit uses a constant cut in temperature controller, so it's very important that we put one back in because that's the defrost. You can actually hear it actuated now, unlike before she get your sensing ball, pushed all the way back up in there be honest with you. Normally I want to leak check that coil to since I had it apart, but I'm being lazy and don't want to walk back out to my dad yet so we'll throw some service gauges on this guy while we're down and check it.
Cooperative families running sentence number three, so we're just watching the unicycle right now, it's gon na take a little while it's gon na be ons and off. So it's currently pumping down right now because of the constant cut in temperature controller. It's gon na cycle a few times because the evaporator coil has got to kind of stabilize out the TXV. Is you know flooding when it opens and it's just kind of going back and forth, so we're gon na see these cycles happen all right, so the units operating and here's where we're at we're running an 85 degree ambient a refrigerant pressures are good.
Once I change the temperature controller, we started, I had the Box at 47 degrees Locksley. No, I had it at 51 and then it turned off at 47 and it's cycled multiple times. 47. 42.
42:36. 4135. 14:34. That was our final, where I have it set at number three: on the temperature controller, it's cutting out at 34 degrees in the box.
Turning on at 40, this is all that really matters. This is going to be our product temperature, the cutting temperature. Okay, that's the constant cutting controls doing this job now next, at 34 to 40 degree box temp here was my pressures: 48 psi low to 52 high for a saturation temperature of 14 degrees, so running a 14 degree coil with an evap TD of 26 degrees and 105 degree, condensing and denser with a condensing TD of 20 degrees, okay, we, this is an interesting number I came up with, while I was waiting for this unit to cycle unit cycles off for a minute and 45 seconds, and it runs for 32 seconds. So I average this up to a two minute off cycle: rounding that up to two minutes. That means this unicycles 720 times per day. Then you wonder why we go through starting components on this, and this is with me leaving the door shut, so that number will go up once the kitchen staff starts using this box and opening and closing the doors. It's an interesting number: how to think how many cycles per day it just shows you why we lose compressors on these things, so often why we go through starting components. These things run hard.
You got to give props these little compressors that do their job because they bust their ass, all right, so we're operating properly. One thing I do want to bring up is that delfield themselves has informed me that when you are troubleshooting this unit, so long as you're not having a problem with the top section, the cold rail you want to shut the top off when you're analyzing, your refrigerant Pressures: okay, because the top is a static, cold rail, meaning that there's no evaporator family, it's just a pan. Okay, it throws the pressure readings off and they prefer that you check pressures with the top section shut off all right, so we're looking good now, if you're having problems at the top, then you can turn it on and diagnose by super heat on the TX beat. But they won't tell you pressures what the top should be running, because it's kind of difficult for them to get those exact pressures because they don't know the exact temperatures and it's kind of difficult.
But that's pretty much it guys. This guy's working properly we're going to go ahead and put all the panels back on and give this one back to the restaurant tell them they can use it forgot to mention. Before I finished up, I put a new end on the plug. So that way, it has a proper ground now, all right.
So this was a service call on a table that wasn't working correctly. What I found was that the unit had a bad temperature controller, it's as simple as that, but I don't just stop at the temperature controller. I went through the operation of the entire unit to make sure everything was working properly and then, after I changed the temperature controller, I watched the unicycle until it came within the temperature levels that I wanted it to be a-okay, nothing too crazy. It's very important, though, that you monitor these things and make sure that they actually come down to temperature because it has a constant cut in temperature controller and low charge or TXV problems can drastically affects how the box works.
So, that's why you just got to watch and make sure it actually stabilizes out. That's pretty much it guys right now. You should see some other channels popping up. I suggest you give those other channels a shot, consider subscribing to them, and I will see you guys on the next one. Okay, thanks a lot.
Great presentation
Good video, thank you. That cut out matters tho, sometimes they freeze the product. Nice work.
Great as always!!!!
those units are an "ENGINEERS WET DREAM" . I work on constant temperature equipment where the compressor "NEVER" shuts off and operate for years without any problems, this is also true for "ULT" freezers, that are" on" more than they are" off". compressor failures happen on "ULT" freezers when the operator feels the need to "DEFROST" the freezer, and the compressors(2) can not handle the "HOT PULL DOWN "causing either first or second stage compressor to fail!!!!(older units— 20 years old or older). compressor wear takes place on "START UP"!!!!. rapid compressor cycling is nothing more than a "DEATH SENTENCE"!!!
Lol the "nice little tingle" is why they started running an earth wire along with power and neutral…. it sucked to touch the oven and fridge simultaneously in my dad's house because no earth wire and something had a bad ground…
Installed new compressor, replaced new dryer and capillary tube. Now, I have zero suction on my low side. Any advice?
Another great video! Thank you for making and posting this stuff. I’m not the smartest guy in the room by far and these videos help reduce my learning curve significantly. Service area Kanata??
so correct me if I'm wrong but based on your numbers condenser sat is 105°° and the TD is 20° so ambient was 125° and you're outside on a rooftop? That's a hot place
Hey bud do you have any books and other references for understanding this kind of equipment better. I’m a residential light commercial tech but would like to dive into some of this stuff, just wondering. Thanks in advance for your response. Are you in Orleans ?
I know I sound like a troll and a beginner when I say .. but does this stuff not get inspected or anything .. no ground and I’ve seen the units you’ve worked on how do people get away with this in the commercial industry.. is it because of them being private organizations ?
From the icon, I thought that was some Nortel Meridian thing on a roof. Service area Nepean??
That walk-in/cooler “funk” oder in your video reminds me of one of the reasons why I got out of the restaurant business.
You make good videos, I like how you explain everything step by step….thanks!
Do you bill the customer for all this wasted time? Are you in Barrhaven ?
Nice video, it wont cycle 720 times a day though, when it is full of stock and being opened constantly, the cycles will become much longer and therefore the total cycles will be fewer.
I'm guessing that prep station has seen too many vinegar spills.
I’m sure you know this but sometimes when I test that style thermostat you can put your lead on the two connector while the wires are plugged in and if you read 120 or 220 and your thermostat is calling you know that the contacts are bad in the t-stat, I do this on walk in coolers. Great video Service area Barrhaven??
Think that one stinks, try working on one at a Starbucks oh my god. You will smell like coffee for two days lol.
Very nice and educational video. Especially for someone who is learning the trade. Thank you sir.
I’ve watched damn near all of your videos and this is probably my favorite one so far. you explain things very well and go into a large number of easy but helpful troubleshooting methods. great video, man
GREAT JOB AGAIN Are you in Kanata ?
I like the homemade chart, it explains even better than the smart probe tablet. Lol. Thanks for the video.
Thanks for the good information. I have taken your suggestions to monitor the operation and temperatures on a prep table recently. Gave me a good perspective where to set the stat. I ended up with a 39 cut in and 34 cut out.
What symptoms or effects would a bad ground be?
When Delfield mentioned to check lower evap while top is deactivated, is that why you had a lower than normal sst of 14F? I’m very familiar, even with a brand new unit registering between 19f-25f for my sst, 19f being if my box is set slightly below 38f
Top notch diagnostics !!
Great video 👍🏻
thank you
Excellent job 👍👍
How long were you on this call out of curiosity. Being newer, I don’t really know what’s acceptable on different calls. I feel like everything takes a fair amount of time in this industry and bills get big quick
I worked on a cold pan unit for a hospital couple months ago. Surprise surprise dirty condenser was the only issue lol
Great video learn a lot from you thanks again
Is there a receiver in there somewhere?
Great video thank you chris. Does that unit have a defrost board?
Great work. You, Andrew, and Dave, are killing it. Thanks for the great content.
We got the funk prep table funk
You are a consummate professional. Keep it up. You are an example of the type of man we need in this world. Are you in Ottawa ?
Great video!
Damn good job explaining things! Thanks!!
Solid video Chris, you take the time to cross your t and dot your I. Seeing your procedures makes me step up my game 💪👍🤙💡💡💡
One question/ concern I have with what you're saying about grounding, and perhaps I'm misinterpreting. You show the missing equipment grounding conductor (EGC) prong on the plug, however… that is really only meant to handle fault current. Essentially it's to be used to hopefully trip the breaker or provide a safer path (than through the human body) to ground if the "hot" conductor has energized something it shouldn't (i.e. metal cabinet, which is connected / "bonded" to the EGC somewhere on the unit…). So, I'm thinking that if you need the EGC for things to work correctly… there's a faulty neutral, since that is the "proper" return path for current. Thoughts??
I just subscribed… Thanks for the great videos!! Great logical and systematic troubleshooting!
Great job !!!
Good video ! Good info here. alot of corrosion in evap section / txv for just a few years old & a compressor allready. wow , maybe time for a 5 minute time delay on that compressor to help it out a bit. those cycle times are really hard on that compressor. wow, great vid.
Are you getting Effect by the fire Service area Orleans??
Great video brother, you can tell how often you have worked on those. With the box full with a load I would think it would cycle less, correct(longer run times)? Just want to say again I appreciate you taking the time to make these videos👊 Thanks!
That is a delfield control? If not what control did you use?
All your videos are awesome I like them a lot they are on point however I dispute and not totally dispute cuz you are accurate and what you say about starting up a warm refrigerator and expansion valve tends to flood cycling the thermostat frequently I too work on a multitude of delfield refrigerators as well. it is accurate what you say if the top rail is turned off while you're testing the refrigerator part of the unit the compressors actually becomes somewhat oversized for the load of the coil so you dropped your suction pressure and being a constant cut in thermostat it senses this temperature colder temperature and thus Cycles more frequently great video
Can u do a video of wiring and seting of danfos presure switch
Nice one again brotha! 👍🏼🤙🏼🤘🏼🔥
Delfields work horse on small units. Good job, on TC. Chris
All this stuff is getting too complicated. They need to dial it back 30 years when the components were made much simpler. You get a few years out of anything made these days before you start running into issues.
Years ago, I worked for a catering/buffet place that sold out to a McDonalds recently. I attended the auction that they had and to my surprise, the walk in cooler/freezers bar/beer coolers prep tables etc. that were from the late 70's early 80's and were all still fully functional, with mostly original components. That said, the owner took care and maintained the equiptment and stuff was built to last.