Rule that says when the new guy speaks you're supposed to ignore him? Or give one word responses to his trade related questions?
"Does this system work this way?"
"Nope"
Oh great. Thank you for not explaining the correct way it works
This is on a rack with ~500kg charge, cooling a number of high ceiling storage rooms to -4F.
This is the first time I've seen this with CO2. I've only seen this on undersized Freon racks before. I am suspecting the system or lineset is simply undersized, but I'm posting because there's something I might be missing.
Please don't make me do the metric conversion, but we had 100F outside at the time, receiver pressure is spot on, suction pressure is ~10K below setpoint, superheat of around 10K on every evap, nothing iced up. All looking good.
Rooms are not reaching setpoint. HP is at max, as it should be, and there's a garden sprinkler under the gas cooler, as is the style at the time.
I added a bit of charge because quite often that helps, but receiver is about 1/3 full and the sight glas still isn't clear.
I have a hunch that there's some room for improvement by playing with the pressures to decrease the flash gas content in the liquid line, but I was on-call and didn't have time for experiments.
We have a number of very similar CO2 racks that have no issues running at these temps without irrigation, which again leads me to think that this is a sizing issue.
Is there anything you would try?
Hi, I'm a pretty new apprentice, and I wanted to hear from folks how you pump down a rack compressor. I was shown what I'm fairly sure is the wrong way to do it. We were replacing a gasket on the high side of the compressor and the journeyman valved off the suction, oil lines and discharge in whatever order and blew off the high side. We replaced the gasket, then he opened the suction, cracked and blew out the air via the discharge (blow and go?), then opened everything up.
I'm replacing another gasket on Monday and want to learn what the right way is.
How hard is it to make a responsive touch screen? I miss keyboards. Thankfully the e3 touchscreen is much more responsive than these
I’m 24 and about to hit 6 months as an installer for supermarkets mostly Walmarts. I’m brand new to the trades and I have loved my experience so far and like what I do more every day. I’ve learned so much in a short amount of time and still feel like I know nothing. So I feel like this is the right trade for me since I love learning and want to know as much as I can.
So my question is what are typical career paths in this trade? My company is a non union company so is union something I should look into or does it not matter much. As the first in my family to go the trade route I don’t have much guidance on what is good and bad so it’s on me to figure it out.
Are there jobs in this field that aren’t overnight? Because while I like the overnight schedule right now I probably won’t like it if I have kids I can see that being difficult. If I do work overnights with kids how do you guys work around that?
And lastly my goal is to eventually own my own house and be able to learn do a lot of the work myself. Do I learn skills to do some residential HVAC work as well? Or if that’s something that interests me should I look into traditional HVAC jobs.
Overall I’m happy and really excited to be part of this and think it’s the right fit for me I just wanted to hear from people that have done this to get advice and hear experiences or stories.
25 year old have been in low temp since being out of school, about 3 years goin on 4 into the trade currently earn 25.50 for a small refrigeration company, am being offered a role in repairing and keepin maintenance up to par for a big franchise for low temp equipment and A/C units, no entirely comfortable with A/C being that all I know is low temp, I would be makin 7 dollars more than what I am currently at, just wondering if it’s worth jumping and getting more on my plate, also would be the only tech at the new place, would be taking care of 20 stores.
I am finishing up a co2 install. The last device I need to setup is the gas cooler controller to run off a 0-10vdc signal to drive the modbus EC fans. I need to have the fans to run 100% at 0vdc and 0% at 10vdc. I have the wires landed and the input configured in the controller but it is not responding to the input. This is my first time seeing this device and I cannot find a good manual. Any input would be helpful. I have the factory startup guys coming out next week but would like to get this setup before then. *fan alarm in picture is just from me shutting off the fan overload relays.
Hey guys I didn't have time to look at this little reach in while I was on another service call but just wondering what y'all would recommend to check next time I'm there for this true RIC sweating all around the frame.
I’m based in London and have been looking into becoming a hvac/r technician but all the apprenticeships are 4 years, does anyone have any experience in South America as it seems you can take a fast track course in 6-18 months, I can’t find anything similar in Europe.
Some parts of north america are in a heatwave now, and I hope everyone's staying cool and hydrated when possible... seen some of these attic psych readings...
Was on a hot rooftop an hour ago but it's nowhere that hot where I am, so I can't imagine! Anyway, as a break from the usual programming (mods remove if not appropriate), I came across this little history of refrigeration technology from the ASME! There are some interesting old patent drawings!
Cool (haha) to think that the first vapor-compression refrigeration machine was built all the way back in 1834, and the technology had been more or less invented several decades before! Have a great day and weekend!
As someone who is 6'3" who keeps it mainly in my back, 16" headroom is not enough
Train/Subway/Metro HVAC system
I know this ain't refrigeration but I thought I would share here as well in case anyone finds it interesting.
Working a freezer that has a unit with a poor temp drop across the coil. I have cleaned the condenser coil.
Haven't found a temp drop in the liquid line for a restriction
States draft pouring like shit and noticed a little ice. Verified timer is working and told him turn it off till all ice gone see ya!
Where to you prefer to install the filter drier - at the evaporator or the condenser? And why?
The reason I’m asking is when I first started 30 years ago it was stressed to install the drier at the condenser, I’m seeing more post, particularly residential, of installing the drier at the evaporator, I was just curious if it preference or a technical reason. Thanks in advance for everyone’s input.
We just purchased and received delivery of a larger 20x10 walk in freezer from Polar King. Since we fired it up one month ago we have the following issues:
short cycling - compressor and fan start up and run for a few seconds and then shut down. This occurs 5-6 times in a row and then stays on.
set point - the set point of -15 F is never achieved. Average temperature from temp stick positioned near evap room probe is -6F. Temperature logs show the temperature never exceeds -10F.
ice accumulation on evaporator coils - despite regular defrost cycles, the ice never goes away.
We had one warranty service tech make adjustments three days after delivery, however these issues are
Reoccurring and the unit simply doesn’t not work as it should.
Any thoughts?
454A refrigerant
Russel components
Hello,
I know that AI wont crawl in places, tingling with parts, but what about the diagnostic part? How likely do you think it is that AI will be able to analyze the system, diagnose and step by step come up with the solution?