WALK IN FREEZER SERVICE CALL

When troubleshooting don't ever just stop at the first problem, always keep looking and always test the system operations, I found a major flaw in the schematic on this evaporator and I'm glad I caught it while onsite.
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00:00 SPONSOR CARD
00:09 VIDEO START
00:39 ZOOMLOCK MAX FOR THE WIN
01:03 ELECTRICAL TROUBLESHOOTING
06:01 LOW [PRESSURE CONTROL DIAGNOSTICS
08:03 TEMPERATURE CONTROL DIAGNOSTICS
12:26 PLEASE DON'T BLOW UP
13:32 BAD VIBRATION
21:02 MAJOR SCHEMATIC FLAW
25:00 CLOSING WORDS

[@mynamesdan2164]

This video is so extremely beneficial, not only to me but to anyone starting in this field. I can't thank you enough for all the help you've given me with your videos, after almost a year at it myself they have helped me be successful. It is always so helpful to hear your thought process as well. Thanks again 👍👍👍👍

[@jasonjohnsonHVAC]

Not that you don't always do a great job of explaining.....but this one was straight.....class is in session video....Fantastic job in explaining the real in's and out's of the operation of the system and its components

[@HVACRVIDEOS]

Thanks so much bud!! go figure this video is performing the worst out of all my recent videos.... I can never predict what KZbin will do

[@jasonjohnsonHVAC]

@@HVACRVIDEOS its ok....i and many others enjoy all your videos and will continue to support you and your content

[@nightone9720]

This is why I like Chris so much. He's a real down to earth guy who actually talks about dealing with anxiety and depression. He always says that he's not perfect and that he's always working on himself to be better tomorrow. That's a real leader. That's a real person that can teach others. He shows his mistakes in his videos. I love that because I learn from those mistakes and he always addresses the mistakes and talks about them. This is why he is a great teacher for this trade and a great role model. Thanks again for everything brotha. You rule dude.

[@CHOMAHOMA]

Thank you for this video. The wiring to avoid the flaw while installing a digital temp controller is all memorized. Great video.

[@gabrielmendoza9165]

I feel like o just learned more from this video than a couple days at my job

[@rmhanseniii]

Actually this is brilliant….I bet these videos are really used for training his apprentices

[@MikeB9771]

Very thorough video, Chris you have very good teaching skills. I have tried to get some of the less experienced co-workers to start watching your videos so they can learn the basics of how a good service tech approaches the problems. Thanks again

[@rocker8692]

I didn't know you deal with anxiety and depression, I'm glad to see your working through it and able to function,I've had it bad for 20 years, it's a struggle.I never thought I was good enough to do commercial AC and refrigeration cause of my anxieties I get nervous easy,so I just do maintenance,you inspire me to say maybe I can do it.Thanks You dont come off as having any problems.

[@shine-cg9uf]

👍💪🇺🇸🙏❄ love the wiring diagram explanation. Thanks

[@SproutyPottedPlant]

These videos are so enjoyable, your voice relaxing and the equipment and diagnosis super interesting! My favourites are the ones where the compressor is dying especially if it’s making a terrible noise 😀 also when you get our the Viper coil cleaner!

[@MichaelAW17]

Dont know why I am here, but I love getting into new stuff. Love the content!

[@AlexJ5A13X99]

I love long video lengths. Too many people think knowledge can be just jammed into a 3 minute video because of short attention spans. I think the longer the video, the more I will learn. Awesome vids!!!

[@BeezyKing99]

Not first, nor last.... Love the content you bring out... gotta love stubborn customers, sometimes eh?

[@AIM54A]

That right condenser fan at 18:22 - 18:41 is sure jumping around on its mount.

[@mtucker3401]

Great breakdown on the wiring schematic! Once you jumped across that switch, I saw the issue right away.

[@pedrojardim1163]

Good staff I really appreciate 🙏 for ur hard work

[@AWD_DSM_FTW]

My favorite part of the HVAC videos is always seeing all the dry rotted closed-cell insulation that is just slid on instead of proper 3 piece 90's. Some PVC jacketing would make that stuff outlast the units and perform the same from day 1. The insulation I mean. :P

[@SCOTTYD2031]

That was really good explanation on the schematic. Thanks Chris!

[@eduardosaurez530]

Best KZbin channel for HVACR! I legitimately wait for videos to drop like 👀

[@pedrojardim1163]

Good staff from Chris very useful

[@HappilyHomicidalHooligan]

I still think you need to modify your Contracts to include a $500.00 Propping the Fridge/Freezer Door Open Penalty followed by a Mandatory addition of an Air-Raid Siren Open Door Alarm triggered by the Propped Door Penalty... So every time they Prop the door open and you can prove it, they pay both the $500.00 Penalty AND pay to have the Door Open Siren installed... Make sure you choose a Siren that can be heard in New York...

[@brucejones2354]

This is one GREAT IDEA ! ! ! THE PROBLEM IS, IT TAKES SOMETHING LIKE THAT TO TEACH THE PEOPLE TO CLOSE THE DOOR !

[@philltafolla]

Great video Chris . I must say for some reason those Russell / Cold Zone style evaporator coils have problems with blades rattling and vibrating and that causes a mounted on the coil thermostat to fail . Either the bulb breaks or it just goes out of range . Seen this also on the new style Larkin coils with the thermostat bracket . Thermostats fail due to vibration or thermostat bracket not fully secured .

[@JjMn1000]

Happy for the new video! Just a tiny bit more knowledge.

[@jamesmooney5348]

This job is so funny and typical!

[@Bruce19]

Great explanation!!!, keep up the great work. Enjoying my high quality HVACR hat up here in Ontario Canada Cheers

[@tbelding]

I had to look up when I heard "Ronco ETC 141". I didn't realize that Ron Popeil got into the HVAC business. Then I saw it was a "RANCO".

[@KoScosss]

Another new van incoming 👀 Expecting a video tour of new one with commentary like with current one 👍

[@Macdrew209]

Great work as usual, even us seasoned techs can use a detailed refresher from time to time , you always teach me something !!

[@kevinpoore5626]

Well I am not an HVAC technician I literally do everything else but and the reason why is if I were to learn the legalities of HVAC I probably wouldn't lose other pertinent information do I have held ETA cards for mold lead asbestos and biohazard but your videos are informational and because a good technician is always aware of his surroundings to quote Mikey pipes #pipe doctor

[@jamesmooney5348]

You're cool dude! Thanks for being so open!

[@lwangajohn3257]

I love the way you explain things

[@joshuapalmer248]

😂😂 it’s surprising how many people don’t realize using hot water is the best option to melt ice. I’m shocked they didn’t puncture the evap coil. I do supermarket refrigeration, had one store use a crowbar and hammer to chip ice, blew the entire charge.

[@brianmcdermott2430]

Great info. and troubleshooting. Like being in school. Thanks for all you work. Best to you Chris.

[@Tek69]

Nice work. Really enjoy your logical fault finding thought patterns. 👍

[@Damicske]

Wow that right fan motor on the compressor is wobling

[@joelacosta3521]

Thank you so much for the very informative video you have a good day

[@Rambogner]

You should get a tablet case, I recommend the Unicorn Beetle Pro for the Tab S8 Ultra, very rugged. Saves the tears when you drop $1k on the floor

[@XxTWMLxX]

I use those supcase ub pro cases on my phones. Have even survived being run over.

[@tcstom1243]

Chris, That circuit is always switching between #3 on the time clock and #4 depending if you are in refrigeration or defrost. So in theory you can never depend on a constant 208 volts at #3 or 4. N is always there. N and 3 is hot during defrost and N and 4 is hot during refrigeration. I always run a wire down from#1 on the time clock, now I always have 208 volts available no mater if its in defrost or refrigeration. I some time use this for the type of temp control you installed or power for a condensate drain heater. This saves running a 120 volt circuit for a condensate drain heater to plug into. If your pulling four wires one extra is easy. Great videos by the way, even after 51 years of doing this work there is always some thing that can be learned.

[@dino.w2189]

Chris Great point Always write issues you see on invoice so when something else fails you can say Yes I mentioned that last time and you didn't want it actioned

[@IFIXCASTLES]

When I can, I run power to the digital control full time and it never has to restart and go through a start up menu. There are usually unused wires connecting roof to evap. N is always there .

[@HumanRightsRevolutin]

Awesome video Chris TYVM. Please make more videos with the schematic drawings like you did on this video. So so helpful

[@juliuscostapeters]

hello i´m from Brazil i started to watch your videos because i lite to see soldering and braising is a type of solder. but because of you i learned to respect these who work in this area now wen o in the super-market and i see a reach-in cooler open i do my part and close it

[@thesilentonevictor]

Good video Chris on this one 👌

[@ericpaul4575]

18:22 I noticed the right condenser fan was vibrating. Looks like it needs a new bracket.

[@mainj54]

I personally first check the thermostat and solenoid operation before the roof.

[@LATINTHRONE]

Been working at a warehouse for 7 years. I'm 32 and want to join a hvac school. I'm so hungry to learn. 🙏🏼

[@Nighthawke70]

Here is a quick trick to balancing fan blades: Get a lawn mower blade balancer (5-15 bucks take your pick), set it on a level surface then set your fan up on it to determine how you need to tweak it. It's basically a top set upside down on a nail with concentric steps on it to set a variety of hub sizes properly. It's simple, easy, very portable, and can save time and money (which is both in any business) with replacing fan blades even if you can rebalance them without damaging the blades.

[@JM-wk2tz]

Awesome video!, I’ve found your channel through the compressor masterclass I’m taking with Trevor Matthews, great stuff!

[@HVACRVIDEOS]

Right on bud im also taking the current one right now!

[@JM-wk2tz]

That’s the one I’m in right now too!

[@baelevatorsmore728]

It’s funny. Quite a while back I mentioned my work replaced all of our display coolers with newer True display coolers. As it turns out, I was wrong. Target didn’t replace all of the coolers and one of them recently started doing the signature “leak of death” where, by my guess, the refrigerant is leaking out of the ailing compressor until it runs out and dies spectacularly.

[@randallweaver7034]

Another great vid!

[@JuanGomez_]

Good explanation

[@robertlapointe4093]

That switched neutral is some dumb-ass engineering. Besides the problems you encountered, it also means that all of the connections for the evaporator motors are always live, even when they are not being called for. A less cautious service tech (or an idiot trying to defrost the unit with a knife) could get a nasty surprise.

[@AnthonyDeRobertis]

At 208V, that's two hot legs off a three-phase supply. Each will have around 120V to ground. If they switched both legs, that'd provide a safety benefit.

[@Stuart68505]

It is 208 with two hot wires. The label of “N” is deceptive because there is not a neutral that they use for power

[@Stuart68505]

@@AnthonyDeRobertis I agree except in some cases it might just be a 208 volt A/C power supply to the building instead of a 3 phase building supply depending on the size or needs of the company.

[@robertlapointe4093]

@@Stuart68505 I could be wrong, but I thought that the evaporator fans were running on 120V, one leg of the three-phase 208 to neutral, as shown in the schematic. If those fans are 208, then they would need to be switched from both sides to prevent them being live when off.

[@More350Power]

I worked at a grocery store and my instructions were that if I saw the fans not running and the unit icing up, to use a wooden mop handle and smack the fans till it broke all the ice and they started running again.... not the right thing to do, but its what they asked lol

[@dunnar90]

Thanks!

[@Decap1956]

good job 👍

[@bait28]

Ive bent the top of the temperature control to physically press against the set wheel, to act as a friction lock, preventing it from moving, not a pretty solution but is a quick fix for customers who would prefer not to or can't spend the money on it, granted the vibration needed attending to more then that, that was pretty violent

[@draconightwalker4964]

18:30 the right hand fan is wobbling around like mad in this shot, take a look at the back of the motor compared the compressor

[@johndeerefan725]

With the fan motor, it failed before you guys left, prevented another service call, and with the customer chipping the ice off the coil with a knife, I'm surprised they didn't puncture the coil when chipping the ice.

[@rmx77]

something i noticed was that the one fan motor on the compressor was vibrating and shaking up and down. better to get the big picture as you always say. i just happen to notice it and yea. sometimes things get missed but oh well things happen

[@throttlebottle5906]

as long as the defrost clock cuts power to terminal 4 when it goes to defrost. then you could use the NC contact of thermostat, so the solenoid coil is always powered open and have the timer open it at set point. I imagine that's what they meant to do on the schematic and just used the wrong terminal, a thermostat failure would probably fail with circuit on and box getting too cold.

[@techaccount768]

dude you amazing. can you, or do you already have a video explaining the low pressure switch or dual pressure switch, I really want to understand that switch.

[@Stuart68505]

Very helpful ideas on analyzing the system. I wanted to hear you explain how you make the small adjustments to balance the evaporator fan blades. Apparently the digital controller power was in series with the solenoid coil. This would drop the voltage to the controller. When the solenoid was de-energized the digital controller would lose its power. I liked how you emphasized going through all the functions. Noticing lint on the grill for the evaporator fan motors was a new concept to me. I wanted to know how you got rid of the ice in the control section of the evaporator. How do you suggest the staff should get rid of the ice instead of using table knives? I suppose putting it into manual defrost a few times would be the safest way to clear the ice. Sometimes the staff would turn off the breakers for the compressor where I used to work but then they would forget to turn it back on. It seems to be a common problem when the staff hast to run in and out of the freezer maybe you could have a discussion about how companies can deal with the problems caused by leaving the door open. Thanks, Stuart

[@woaiakb48]

very good!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[@robertpeters9438]

Why not use a magnetic door hold open with the door open timer so that the door always auto closes. Noone can forget!

[@ralphgiampietro85]

Check that last comment i finished watching the vid i see how you wired it i myself wouldn't wire it that way but it works👍

[@MattTrevett]

Love how the last few videos have included "DIY" by the restaurant staff and it's always dead wrong.

[@jerryfrigeration]

Awesome

[@davidmiller9485]

If they don't want it to freeze up they need to learn to close the damn doors.

[@megacisco69]

That’s not true about the fan blades! I replace them all the time and i never have adjust them at all. You make it seems like you are so right amd I’m not trying to knock you down but just being real

[@bphc1969]

No your amazing

[@analogmoz]

Yes his amazing

[@jspilly82]

in Australia nothing is switched on the Neutral side. Ive noticed a lot of stuff from china is switched on the neutral side. we have to be very careful as sometimes even when things arent running there is power on a terminal we dont expext it to be. I wonder how many other countries experience this?

[@CKSChurch]

2:35 freaked me out, didn't realize that you had so many hands bud.

[@throttlebottle5906]

they may be breaking down/opening a lot of cardboard inside them with box cutters, that creates a ton of lint.

[@jamminwrenches860]

Every customer wants a cheaper call, some want you to only repair the current problem then like to blame for the next call in 3 months. They can't have it both ways.

[@jonathonturner5220]

Fan delay switch seems like it failed or was by passed. Fans came on immediately when you turned power back on. Would explain why they were chipping at the fan blades with a butter knife.

[@donwilliams9661]

You missed one point though, by powering the COM it also connects to H4 terminal which would power everything, did you mean to remove the existing line to H4 also?

[@More350Power]

When you first walked in, to my ear, it sounded like there was a bad motor or a motor with worn bearings..... also when the unit started that motor that failed didnt sound to well.....

[@farashvac]

So if I’m following the schematic correctly Chris , the wire on common on the original wiring based on their diagram dosent even need to be there after your modification by running a separate wire from N to Com?

[@joshm7347]

You mentioned that the customer did not turn the T-stat, but moved due to vibration. So did they ignore it for ages while it was slowly adjusting upward? In my limited experience I’ve seen them move, but never by 50° swing without customer interruption. Also given they leave the door open, they probably know it iced up and someone may have cheekily adjusted it (or maybe boxes hit it if they were stacking them)

[@nrdesign1991]

I have no experience in the field, but from an electronics standpoint power cycling a digital thermostat all the time doesnt really sound right.

[@jessepetty8636]

oh! im early! another great vid!!

[@kevinhoober1863]

Chris, You are a master instructor!

[@jonarmedpiandsecurityoffic9051]

I wonder if the corporate owned businesses come down on the stores for all the maintenance issues that they cause due to negligence

[@joehead1294]

How about jumping the com wire from H4 over to N instead of running another wire?

[@ShukenFlash]

Is it my imagination or was the right condenser fan motor wobbling quite a lot up on the roof?

[@sergiomateo7671]

Why were the fans running when the coil was not down in temperature? Wasn’t the fan delay supposed to be open?

[@stephwaylonwells3218]

👍

[@cthomas1864]

Why didn't you use the old knock out for the new temp controller?

[@Mburin_B]

why were the evap fans running in the beginning if the thermostat was not calling?

[@petenikolic5244]

Phase neutral colours incorrect . you are indicating Neutral as red

[@JjMn1000]

I think it’s because 208/240v and not 120v. Sometimes phase 2(on single phase) is marked as neutral. Sometimes it’s white and sometimes it’s red.

[@farmerhunterjr]

Correct it's labeled terminal N at the defrost clock which is why its marked N on that diagram but in this case its not N for neutral. Its one leg of 208v. In a smaller unit it might be neutral if the unit is 120v but in this case he is correct marking it red. In commercial refrigeration terminals marked N and G dont always mean Neutral and Ground. Its just whatever letters the manufacturer decided to label them as. You need to use your head. Also good luck diagnosing by colors. Ive seen everything under the sun used for whatever or my favorite when all they had is black so the whole unit is wired with black for all the control wires. Best advice i ever got when learning electrical is electricity is color blind you should be too. Dont trust colors.

[@ScootinCanadian]

What’s your thoughts on R744? Seeing it more and more often here.

[@ImZyluxOG]

I’ve only been doing service for a couple months. But upon going into any walk in not temping correctly, the very first thing I’d do is turn that temp control to see when the solenoid valve opens and closes in order to see if the temp control has failed (insanely common). Is there a reason why you didn’t just check that first considering you were in there first? I’d assume it’s because you’re training your apprentice?

[@timvener3723]

Broken condenser fan bracket on the right?

[@Kp-fv8jn]

Is it just me who Watch is this to fall asleep

[@Chris_In_Texas]

So it appears that you have not been talked into joining the Dark Side yet, I mean Wago side.... 👍😁 Wire nuts how so 60's! JK Great job.

[@staceymodisette1149]

products stacked to high

[@Brisket9392]

Chris. The digital controller will lose power during every defrost though as you lose the #4 leg. Could you wire L1 on the digital stat to both #3 and #4? I wish there was a good solution besides running a neutral which is what I do now. Rather keep all the wiring in the evap.

[@HVACRVIDEOS]

Yeah it loses power in defrost but it works fine that way

[@kaptaintrips]

@@HVACRVIDEOS Chris, you were working on old, hot garbage. Only because you are so thorough did you save a call-back and I commend you for that. A true serviceman! couldn't you just jump across in parallel to the 2 hot wires you pre ran in your conduit with to both legs provided in the evap terminal board to keep constant power to the digital Tstat? Doesn't really matter, I know because it will power up after defrost, go thu the anti cycle delay and power up the LLS... That must have been a frustrating call none the less. You have the patience of a saint. I must add: when you get those customers that start bemoaning about how you have been here X many times on a piece of equipment and all they do EVERY DAY is abuse it...... pashaw, guffaw!

[@Synergy-95]

It looks like the fans would run non stop and that fan delay wouldn’t change anything. Power from N goes into com then out of com into h4 then out of h4 into the fans. 4 has power always going into the other side of the fans so wouldn’t they always run and the fan delay basically bypassed? If I’m wrong please someone correct me so I can understand.

[@farbe123]

Time clock.. Why time clock? Are there different kinds of clocks? Clocks are always time, right? Shouldnt it be Timer clock because it runs multiple timers?

[@grashoprsmith]

I bet you are fun at parties 🥳

[@dashcamandy2242]

🎶 "Don't make me feel any colder... Time is like a clock in my heart..." 🎵 (I'm worse at parties...)

[@alexferia3323]

Sorry Chris But the vibration is a stretch

[@ralphgiampietro85]

Just curious where are you getting constant 208v to power the controller

[@farmerhunterjr]

Hes not, it will turn off when the unit goes into defrost and turn on when it goes back to refrigeration mode. Not my favorite way of doing it but kind of necessary because you dont have constant 208v run into the evap and running a set of wires for that would be a huge pain that the customer probably doesnt want to pay for and is not necessary. Plus if you dont wire it right then you could have a situation where the thermostat will keep the unit running and never cycle off during defrost. The way he did it was pretty much standard for how its done in walk in freezers. As you can see by the diagram thats how the factory set it up minus the typo he showed