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Yes all the walk ins are split systems that pump down with no controller call.

No, all different varieties!

Might have more to do with it being aluminum, than microchannel.

Got ya

I am at a facility which I’m guessing has 75% copper tube and fin (old school) coils and the rest of the 25% newer stuff being microchannel.

We are experiencing a disproportionate amount of...

Kinked liquid line? Sorry I didn’t read the last 7 pages of posting if someone already suggested it.

If I’m understanding the thread.... your incorrectly sized TXV caused a suction on the vapor...

I apologize, my response was a little over the top. I was kind of upset about the made up resolution. Best of luck to you.

It’s ok to not know what you are doing, it’s NOT ok to come on here, act like you do and then try and blast a bunch of veterans who know better.

Watch some basic YouTube videos, figure out what...

Damn it’s always that blasted water pump!!!

What was the voltage drop from L1 to R1 and L2 to R2?

I’ll answer for you... you don’t know.

Don’t come on this forum and act like you know what you are doing when you don’t, we will spot it...

Nope

Nope, something else was wrong.

Please enlighten us on how a “backwards” contactor doesn’t work as opposed to a forward one?

You had something else wrong.

Direction through a contactor has ZERO effect on its operation. You can say all day long that it does but all of the experienced people here know that it doesn’t.
...

Lol, an electrical check valve in a contactor!?
A water pump!?
Just wow.

Ok, when you say that it’s going out on overload, do you mean the internal compressor overload, or a high pressure...

My guess would be low airflow and someone added charge watching pressure only and not watching superheat.

Make sure the coils and blower wheel are clean, dial in the airflow as well as you can,...

I have done many evap pull and cleans over the years and notice that once in a while I have a coil that no matter how much time I spend or how much chemical I use the coil still retains a dark kind...

They squeeze off and valve off a piece of copper while still in the factory.

When your charging with liquid, stop when the compressor starts getting noisy. When it quiets down, start charging again.

The reason you can charge R22 as a vapor is that it’s not a blend.
...

Sounds like pressure “chatter”, kind of like a rapid water hammer.

I could be way out in left field here but if heat pump thermal expansion valves have check valves... could too stiff a spring or...

Window unit with electric heat... use a thermostat that will allow reheat for humidity control and wire in the heat strip with a relay?

Might not be energy efficient but it would probably work and...

Sorry y’all I meant to reply to the guy who said compressors don’t run well in reverse, I don’t post enough to know why it didn’t reply to his post directly.

Unless it’s a recip ☺️

Unless it’s a recip 😉

I have had the same issues over the last 20 years or so... to the point that I rarely use an electronic leak detector. I’m sure some would disagree, but in my experience I have had more success by...

Everything is sweating, hanging rod, sprinkler penetrations, armaflex, etc. it’s pooling up in low spots left from a sketchy installation.

If I had to guess it’s close to 3,000 sq ft with nothing...

Thank you guys, I think we will try re-insulating some and see where that takes us. Will update when we get around to doing it.

Thank you poodle head, this appears to be what was happening.

Sorry
It ended up being compressor valves

East central Florida here.

I’m not there now but I would say 3/4 inch walls and about 5 years old.

To me it does not look very deteriorated.

The large WIF that had the roof fall in made us suspicious of high humidity in...

At my site, we have 72 walk in freezers and coolers. Most of them are in un-conditioned spaces.

We have an ongoing issue with many of them with the suction side sweating.... the outside of the...

I’m fairly familiar with seeing a TXV hunt on startup or when failing.... but today I watched a piston metered system appear to “hunt”.

4 ton straight cool split with maybe 10 ft lineset.

3...

I reducted a remodel in Edgewater FL and the inspector would not budge on making me install R8 flex. Every where else in Florida we use R6 and the inspectors are fine with it. The supply house had to...

My suction SH is around 20. The discharge temperature right off the compressor is about 200 degrees.

Yes during on cycles the suction line frosts all the way back to the compressor.

My boss...

Ok, 5 years ago I got my class B Florida license. Here are my thoughts in retrospect:

1: Do not approach it in a nonshwlaunt manner. I literally took 4 months off from work to study. My schedule...

We are concerned about the compressor heat, as this is the reason the DTC keeps metering after the compressor shuts down. Is it better to have the compressor run hotter than desired than to short...

This is a good idea, I will run this by my boss.

Sorry it’s gone.

the DTC is causing the short cycling, but because it’s doing it’s job. The ultimate reason was the compressor running hot. I mistook the valve doing its job as an internal bleed by. Lesson learned.

This sounds like a very simple problem explained in a very complex manner.

That is why everyone commenting has responded the way they have... including me.

Please save your time and seek out a...

Snapperhead.... yes other units with the same exact setups are doing fine. I heard one cycle today, but only once after shut down.

This is interesting about the internal check valve possibly going bad.

I have noticed that when they try to shut down the feed from the discharge temp valve is so strong that it actually spins the...

Sounds like running the system with both gauge knobs wide open. It’s happened to the best of us!

Are you sure the compressor is on?

But you never know when something weird can show up!
...

Ok, I screwed up and had to learn the hard way once again... but have some questions.

Where I work we have 78 walk in freezers and coolers.

A couple of them have been short cycling like crazy....

Once upon a time, in a Florida town called Port Orange....

Someone was contracted to reduct a “gutted” home.

The contractor re-ducted the gutted home (after much due diligence with sizing and...

Why are you leaving?
What makes the new company more attractive?

Apps are a good reference for confirmation sometimes, but as stated above use your brain to diagnose, then use an app if necessary to double check what your thinking.

Apps alone suck in general...

I’m not familiar with seeing them burnt but maybe it’s because they are somewhat rare.

I wonder if the phase shift of the capacitor could throw neutral potential off?

My mind!

Just kidding, I did lose an a few screwdrivers or so... but nothing too expensive.

I left an sman on the side of a house once but upon returning it was still there.... thank god.

The problem you’re describing has to do mostly with the corrosive effect of arcing when the points are closing or opening.

The ark is caused by the potential between one side and the other.

I...