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Flowing nitro is very common, the pro's do it.

Also, if you can get your hands on oxy acetylene, that would make it much easier.

Shouldn't require an outside guy, it's really not that difficult.

What I was taught at a class at Trane, is get the copper a dull cherry red color, then just stick the rod on there and it'll flow,...

Good, guess I might not have been around too much then.

Very true, that tends to be the fun part, when you get to where you've guessed it before you get to the unit, it tends to get kind of sad,...

Bberme,

Haven't seen you around for a while, how you been?

I try to occasionally sound intelligent.

I agree, I tend to look for leaks first just because it seems more common, non...

I feel fortunate to know who the Guru was or these things would go over my head.

Say your discharge temp is too high, what would your first thought be as to why? A restriction, low refrigerant or...

Well....

The alarm is high discharge temp, which probably means the unit is not getting cooled like it should be, the compressor that is. So, checking your suction SH would be the correct first...

Sure, but was it going off on overheat until someone messed with it? No.

I'm sure any of us could walk in anywhere and find some problem with some unit, small or big, that's what we do.

I believe as long as the discharge temp is below 225*F you'll be okay.

Why would I care all that much how much hotter my refrigerant is AFTER the compressor? Superheat is there to ensure flooding...

Normally when a wire connection burns up, it's at the point of the connection or section if wire that's burnt.

If the unit was overamping and your breaker didn't trip or a fuse didn't blow, it...

I agree with PHM on this one.

You didn't have a problem until someone messed with it, at least not performance wise. Sure, you could replace it, but I doubt it's necessary to get it working like...

Okay, sounds like you got it nearly figured out.

The reason it's hard to turn will most likely be a bearing issue and may require you remove the shaft and replace the bearing.

Great!

What's the temp of the discharge line?
Superheat?

What's this unit service? A walk in fridge, refrigerators?

Also, get an approach temp on the loop. Here's a thingy I made so I Would...

In this case you are talking about a vacuum pump and trying to fix it, I doubt that's something we can't help with since it's not really a danger to yourself nor are you able to call an HVAC tech...

Just logically speaking, the box wouldn't be cooling and the suction side would be 0 if the solenoid was not working.

Sounds overcharged to me.

Could definetley be, I've had them go bad on Vulcan convection units before, same problem where it wasn't as hot as it should be.

Very true, I agree with that.

This is the model.

LACA-032E-TAC-800

Looks similar but I don't think the models similar, it's quite large.

That is correct, according to copeland, 225*F is the MAX MAX MAX discharge temp on the discharge line.

Check the discharge temps, check the suction temps, SH and that'll tell you if it's too hot.

I know I have a similar one for a freezer but it has a fan on it and is water cooled.

I would think if overheating was a problem, there would be more indicators than that, I don't see any discoloration to where the oil might have been baked on.

Is the oil is sticky or tacky, I...

I do agree with the pay being more potentially attracting more people.

And it is true, unfortunately a lot of the youngin's are starting out gaming in a young age where they naturally lean more...

If all the other comps are the same type, you should check those units for inlet SH to the comp and see how they run, could've been JUST that compressor having a problem or a bigger problem in...

Important you keep an eye on it, a drop in suction pressure affects the compression ratio significantly and can rapidly cause the compressor to overwork itself.

Attaboy.

Makes sense.

Fully understand your position. The key is just to realize and understand that something killed the compressor you are pulling out and spending 10-20 minutes taking the head off to...

Hmm.

Got pictures?

How are the valves shot? Pistons look messed up?

any discoloration of the piston seats, rings or anything? Was the oil sticky, tacky and full of metal?

Details man,...

What's wrong with the old one?

Considering I learned this trade without going to school and mostly without someone else teaching me until I was quite a ways into it AS well as being of the "newer" generation, I can say that the...

There's a bit of a difference there. If a cop asked me straight up if I was speeding, I wouldn't lie to him.

I see your point though, I'm just saying, if I KNOW that the compressor is using a...

I agree, if I arrived to the job and saw it was different refrigerant than what was listed for the comp I wouldn't lie to the manufacturer, I would tell them and see if they would still honor the...

Yeah, I'm not convinced.

15-30 minutes is not a very long time, much less without an actual start and end reading, I can't tell you if it was good or bad.

Not pressure testing is cheap and...

Okay, that makes more sense but still,

A vacuum is not a good way to test for leaks, it could be a small leak and he could be seeing a micron rise on his gauges and blamed it on something else,...

I mean, I wouldn't lie to the manufacturer and I would personally feel bad about not telling them that something else was in it, if I knew about it.

They might check the oil in the compressor and...

Good point, that probably voided your warranty right there.

Better late than never.

Poodle Head knows much more about this than I do, in general, lol.

But I would also be wary of having refrigerant with one oil and a comp with another, there's a reason they aren't the same and I...

It shouldn't be stably dropping even if it has refrigerant in it.

If anything, it would go down, then up, then down, etc.

I had a nightmare one where the filtration bin had tubing that was clogged, I had to drill a hole into the tube and through the carbon blocking it, then weld it back together.

if it's just oil,...

Most compressors are designed for a specific application, BTU rating and volumetric flow as well as power and type of oil and refrigerant.

You can't just get any "2 Ton Compressor, it won't work....

80% of the load is the max rating of the breaker, 16 amps would the max allowed load on a 20 A breaker.

as far as I know, so I'd say you're good IF the unit was rated for 15 amps.

But it's MAX...

When is the next tech coming out?

Yeah, it all depends on the part you are trying to make.

Some things are not feasible to 3D print, others definetley are. Unless you drop a couple of grand on a printer, you won't be able to...

If it runs, I doubt it's the start cap but it could be other start components.

When the compressor starts the start capacitor gives it what is essentially a kick start and gets it going, there is...

Plenty of food safe filaments and there's ways to make them food safe after the fact if you are worried about it, I find that nylon gives the cleanest seams between the layers where another common...

True, doing writing or logo in 3D is really easy though.

Making a model which is "solid" and where all intersecting geometry is done properly is much more difficult, took me a while to get the...

Yeah, sounds like a safety going out.

Bypassing a hard start makes no sense, replacing one to see if the old one was bad I could understand, the compressor won't start without a hard start or...

I find the chefs normally have a pretty good idea if something is wrong, at least where I work.

As for the sound, It could be the spark module as mentioned above, otherwise I've had issues with...

The tech bypassed the start cap? For what?

:angel:

If the compressor didn't run then there's no way he could verify that. Getting pressures and seeing if they are good or bad takes at least a couple of minutes of run time.

He may have looked at...