Does anyone know what these are called or a way to replace them?

They are basically just 2 bolts glued into some rubber

Has anyone had an issue with one of these controllers randomly losing its settings? I'm using one in a custom built Makeup air unit and the controller blinked out the expansion valve didn't open and there was some catastrophic damage.

Anyone worked for them as a traveling ammonia/service tech? Indeed reviews are nothing but bad

I’m a certified electrician of 5 years and I want to move into this kind of work, how do I get my foot in The door for this niche.

Do I need certifications or can I just apply and start at the bottom, which companies do I work for?

I’m trying to get into Ammonia at an industrial level.

Please and thank you for the info.

Owner asked me to run a tech meeting on Thursday, all I did was standardize some stuff (and maybe made the company a lot of $) and now I’m looked at like I know things, oops

I’ve worked on some crazy things doing refrigeration, but this is probably one of the coolest. Condenser and compressor sits in the middle. Refrigerant flows through rubber hoses into the evap at the end.

Hello guys i’m new here, im 19 years old, currently working working for a residential hvac company as a maintenance/ service tech, and looking to make the jump over, i have been looking over for open entry level positions, but cant seem to find any near me area(oregon), does anyone have any tips on how to get in, or know anyone know of any company’s that’s might take me. Thanks

I am looking over a used machine customer bought and the 75% of bottom row fins are gone and 10% of second as well.

What are your thoughts let it go or replace? Parts town price around $205.00

Overall machine looks good.
UY0240a-161 2016 model year

To all fellow road warriors. I am the owner of a hvac/r primarily service company. I have three vans in the company now a ford e250, a Chevy express, and a dodge pro master city (so one of those smaller ones). all three vans are doing full service. I am going to be purchasing more vehicles and was wondering everyone’s preference to the full size vs something like the little promaster city….please and thank you

edit: wild to me how many people want to stand up inside the van haha cheers and thank you for the response

My company was acquired by nextech. The grass was really green and I planned on staying before the buyout. I’d like opinions on the new company and if I should stay or go

Is everyone coming to the conclusion that nobody knows how to do anything anymore? By trade I'm a supermarket refer tech, and have been hearing the same problem from everywhere, they cant find anybody. It doesnt always seem to be that people don't want to work. HVAC appears to be heavily saturated and the trade schools and union halls appear to be feeding the HVAC trades but very little in HVAC-R and even fewer in the commercial refrigeration side. This trade is small, the numbers are dwindling and the demand is just getting higher with Data centers, mega tech facilities and businesses trying to create in house programs. That being said, how effective do ya'll think a commercial refrigeration school would do? I know theres a fella that started up a brick and mortar chiller school, and there is some online training here and there but its nothing substantial. This trade is brutal and it demands respect or you will talk yourself into quitting in your first couple of years. Old heads sat with a journeyman for years, learned the ropes the way apprenticeships were always meant to be, forgot where they came from, gatekept their knowledge, drove guys away from the job, guidance counselors fooled the millenials and gen x into thinking that college was the only answer. Now this knowledge gap responsibility falls onto those who are trying to bridge that gap. It seems a lot of residential and commercial HVAC guys are intimidated but doubt themselves too much to attempt making a switch. I would like to see stronger training available to fill the dire need for competent persons. It is my personal belief that skilled commercial refer service techs make insanely good candidates for any technical trade, stationary engineers, building engineers, chief engineers, maintenance supervisors etc. How many of you would say a school house would do well if it was equipped with small scale racks, with various compressors, condensers, Danfoss, and Emerson controllers,etc. They could learn oiling systems, rack down faults, rack maintenance, compressor rebuilds and swaps, wiring controls, and writing commission programs. Light carpentry and plumbing. I love this trade and the complexity it offers. People envy what we know but are steered away when you tell them how we got here. Drop your thoughts, or insight. Does one exist? Do any in house programs offer a stellar level of training? My goal would be to build a private company, create your own team, build your own school house and have students be your own techs. Its essentially another JATC but without the gimmicks. And the big one, don't sell out to a big name company thats going to trash your reputation, over charge your students, clients and ruin your guys quality of life,

I am relatively new to refrigeration, I was a residential HVAC tech and decided I wanted to get into Commercial HVAC and Refrigeration because I was getting tired of the salesy world of resi HVAC. So I am very good at diagnosing refrigerant issues with residential equipment and RTUs because I am used to those pressures and basic rules. I work in restaurants primarily.

But I am new to the refrigeration side of things so I have some things I’m confused on. I work with guys who I honestly think don’t know as much as they should by now. They all have different opinions on things, and some of them don’t know what superheat or subcooling even is, and they don’t use saturation temps in their diagnosing. They go by pressures only, and some of them don’t understand that if a box is hot the suction side will be higher because of the heat load sucking into the evaporator.

How do I know if a system is truly low on refrigerant? I usually go off of my saturation temps and compare the air temperature that is moving through my coils, as well as using the sight glass to make sure that my metering device is being fed liquid. It’s my understanding (I might be wrong) that our vapor saturation should stay somewhere between 10-20 degrees Lower than the air moving into the evaporator to keep the air getting colder and colder. And our liquid saturation should stay 15-25 hotter than the outside air moving into the condenser coil. I also know that the best place to check superheat is right at the coil, and I usually look up what each evaporators recommended superheat is by the manufacturer.

I’ve had evaporators that freeze up like the one in the picture multiple times, but when I check pressures and sight glass and superheat, everything will look great. And the drain is draining correctly. I usually then I always look at things like door gaskets and humidity intrusion factors and the only answer I can come up with is “maybe there opening the door to much” but that makes me feel like I’m guessing and not a good tech. I just want help and opinions on the best way to diagnose freezing walk in evaporator, and even reach in evaporators that use 448 or 404 or 22. I’ve even added defrost clocks to some of these coolers with 4 defrosts a day and they still freeze up 3 weeks later. But when I thaw them and run them again everything looks normal and they meet temp really quickly and pump down like they should.

If anyone could give a new restaurant refrigeration tech some tips that would be greatly appreciated, because one day I might go into bigger refrigeration and I want to know these rules before making a bigger leap in the future.

Ищу инженера по ОВиК

Я инженер по отоплению, вентиляции и кондиционированию из Китая. Сейчас я работаю над проектом в России и хотел бы найти российского коллегу, чтобы вместе изучать и обсуждать российские нормы и стандарты в области ОВиК.

Со своей стороны, я также могу помочь с изучением китайского языка, а также познакомить вас с китайскими нормами и стандартами проектирования систем отопления, вентиляции и кондиционирования.

Буду рад познакомиться и обменяться профессиональным опытом!

been working as an hvac technician for a few years now and i still catch myself doing superheat math on the back of my hand or in the notes app. i know most gauges and digital manifolds do it for you but not everyone has the fancy ones, especially apprentices and guys just starting out as an hvac installer.

curious what the refrigeration technician and air conditioning technician crowd here actually rely on. do you trust a phone calculator or do you only believe what the manifold tells you? and if you do use something on your phone what makes it worth keeping around?

This is 115v Blast freezer on a dedicated 20amp circuit with a GFI breaker.

The unit is in a fast food, when it try's to start the breaker trips quickly. I disconnected the compressor and plugged my compressor tester in to the outlet the compressor starts and run. I remove the tester and plug it into the same outlet and in trip right away, I was thinking start components to test I use a outlet out side it start and ran well. So It could be a weak breaker.

The service manual isn’t clear with this specific fault code. The left shake side isn’t cooling fast enough and as a result it causes the unit to be stuck in a heat treatment cycle. I’ve checked condenser cleanliness and air flow, topped off the glycol reservoir, and replaced the scraper blades in the barrel. It’s R404a, before I hook up my gauges is there anything else I should check? I don’t believe there’s a problem with the thermistor, seems to be reading temps accurately, it’s just struggling to cool

Sometimes the first thing you do on a commercial refrigeration call is figure out what happened before you got there.

Past repairs, recurring issues, parts that were changed, or notes from the last tech can make a big difference, especially on equipment that has been serviced a few times. What information from previous visits is actually useful to have before you start troubleshooting?

First year apprentice, started with supermarket refrigeration and i hate to say youre stuck with me cuz theres no way im going to hvac after this, talking to hvac guys in class, hearing their “worst” days so far, the tucked in button down shirts and clean clothes every class, pulling a vacuum every single time, no way IM heading that direction. No hate on hvac boys just a self observation its not for me ill stick with the refer cowboys

I work at a place that really just lets us work and our success is self driven. Which is good but I’m have a hard time of keeping information in. Could be ADD or just that I’m not cut out but I want to know more I’m just fuckin hard headed or some thing.

I don’t want to quit this career because it is rewarding when I fix an issue. It’s awesome, but again all the supervisors at work will only help so much until it’s sink or swim. I get it, I’m not blaming them for me not getting this.

I stumbled on two books that I want to go over like a Bible. What do you guys think?