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Just noticed that reading this thread..

https://hvac-talk.com/vbb/threads/906802-True-T-49F

I was associating CPR with a headmaster.. a condenser pressure regulator.. lol.. didn't think of the...

The true is a t49f with a semi hermetic.
The EPR is exactly as seen in this YouTube video:
https://youtu.be/0GOgkPLarR0
About 2 minutes in he shows it.

On the suction side on both units for sure.

Both have electric defrost.
Could you explain a little more?
I tried to find out the answer on this form before I asked.. on this thread people say it isn't for hot pull down.. so I don't know...

I recently came across a single coil walk in freezer and it has an EPR on the suction side. Also same place working on a true two door freezer and noticed it also has an EPR for a single coil. I get...

I understand impedance, inductance, capacitance, reactance, and all that. Before refrigeration I did electronics. If any of you are are hams you can catch me on 10 meters KC1AFR.

Which is why I...

The 10k (watt I assume) would, but it's going to have half the resistance as the 5kW one.
If you mean a 5k ohm resistor vs 10k ohm resistor the 5k will make more heat.

Ohms law does work with...

No, because more windings is more resistance, therefore less current. Now that the pic is there, imagine m1 and m2 windings as one ohm each, so you get 2 ohms from A to B. Now the a1/a2 winding is...

Indeed is is techman... I got one 2.0 ohms and two 3.5 ohms. So like I was saying, the legs on both sides of the 2.0 ohm winding read high current, while the last leg connects to those two through...

My last post I learned about the current imbalance inherent in some (all?) 3 phase Copeland RST compressors. However I believe all the literature...... is WRONG!! My real world findings are the...

Thank you for the pdf. I've been trying to get on the Emerson opi site, but hasn't been loading up. Tried on my tablet/chrome, phone via Copeland mobile app, and win10 PC/explorer/edge.. none load...

Thank you! Only thing I find odd now is the that the article says two terminals will draw similar currents and the third will be HIGHER... My reading on the third leg is lower... I'll have to take a...

Wondering why I have current Imbalance in a 3 phase compressor..... Perhaps wye configuration windings?

Working on a 3 phase compressor RST70C1-TA5. Has an external overload hooked up to one of...

** Update **
Unit was not working when I posted this thread. I told the manager to unplug it overnight then plug it in in the morning. It's been working fine since. :)

Well the results are in. It worked, and is still working. Start off around 15degrees SST then maybe down to 5 when it shuts off. Head maxed about 110. Box temp right above 32. I don't like how the...

OEM is nice if you don't want to think about it and just fix it... But I want to understand the equipment more, and you cant stock everything on the truck, but if you know whats going on than you can...

So instead of unbrazing my cap tube and taking a look I cut it out so we all can have a look. Yup. plugged! the pressures weren't even equalized when I started recovery and the machine had been off...

What issue made someone to decide to open the TXV all the way though? Hmmmmm....

Well I like all the discussion here. Here is what I did today... I removed the condensing unit and the coiled lineset completely and brought it outside so I could do whatever without smoke or smells....

I agree with this too. my better success is when I look up the specs like that, they like the .046 and I saw the parts book said 10 feet. what I find odd is I will be in what appears to be a virgin...

It had a couple maybe three years after the conversion it was cooling without issue. I agree oil may play a part and I will likely be inspecting/replacing. I'll also post a pic of the flakey white...

83.9: Condenser starting to get backed up as cap tube getting restricted.
100.0: Front shot of condenser shortly after charging
111.7: demonstrating the last run of tube subcooling is taking place...

I do already have the JB cap tube gauge set, except it goes from .36 to .42 to .44, and looking at the chart a couple thousandths can make quite a difference to the length. So either I need another...

When you order a factory cap tube that has the OE spec inner diameter, are you supposed to toss it in as is or do you cut it down to suit your application? (True brand for this question) Supco starts...

OK still new to the field, but I have replaced some compressor/cap tube systems with success, but this one has me scratching my head. Its a small 1/3hp true beverage cooler. front doors, condensing...

I do have a receiver, I do have a clear glass, and being a new unit I'm hoping the comp vales would be ok. however I'm pretty sure I'm going to have to toss a new TXV in there, need to show up early...

That's what is seems to be doing. but with lower SST temps its sure to want to frost up faster especially with the leaky door seals. ?? I understand how to set a LPC to avoid frost but I think I'm...

I mean pulls 35 quick then down from there. Frost's quick. Also can you blow through a txv out of the system? What about with nitrogen at about 50 psi? Say below a minimum pressure diff the txv...

I saw the LPC right behind the front access panel and usually use my gauges and a service valve to simulate pressures but the service valves on this thing are aimed directly at the wall. I used a...

******UPDATE******
Just gone done vac & charge with a second new powerhead.. problem gone.. maybe bad part maybe I messed up either way it's working great now. Thanks for all the reads!

711431711441711451

There is a pic of unit, old power head, and new power head with frosty tube.

One drier for both txv. No llsv. Frost starts at txv.. no kinks that I see, haven't shredded the insulation off the back of unit yet. Don't want to tear it apart more than I have to. Didn't replace...

******UPDATE!!!!!!**********
Unit died this spring. Put a 3/4 HP 134 unit in with new evap. Everything looks normal now. We had a good run though for a unit from the bottom of a barn with valves...

Working on a six drawer delfield base unit refrigerator, the type you put a grill on top. R22 system, 1/2 HP condensing unit (mcph-a048-caa-212) dual evaporators each with its own txv in the same box...

Where was this answer 2 years ago??!! Easiest fix for this application and makes the most sense! Let's give flangehead a round of applause!!!

Wow! Last post was a long time ago but the system is still running strong. Yes 2 years isn't a long time compared to what should be expected but I guess it's not all that bad. Been enjoying the...

OK I've said it time and time again, but I'll say it again... I am an "in-house tech" with no liability... I can take what jobs I want. Leave what ones I dont. We have lots of small appliances in...

..My problem is high condensing temperature. the reason (i believe) is the coil isn't as good at rejecting heat as the old one was. The compressors are same HP so I'd imagine they have about the same...

OK new tech here but i tried... Work at a place with random used equipment to mess/learn with.. Had a burned out compressor on a condensing unit.. Found a similar HP condensing unit with barely...

Well I said I would have results friday but I got a late start. Leak checked with the h10 all joints seemed good. Currently the vac pump is on! down to 650 microns. Going to leave it on overnight.....

Speaking of youtube.... He's some outside the box thinking for u closed minded people..

http://www.youtube.com/watch?v=U1HmO7XPoXI

How many of you still have student loans???

Well we are all so anxious here I can't wait to get my h10 should be in friday. i initially used the 150psi n2 bubbles- had leaky service valves and replaced the one that I couldn't tighten the...

I never said I know it all I admitted I'm a noob I asked a legit question about the air.. Everybody moaned and groaned about the school instead of helping with the questions.. I gave the symptoms...

Yeah funny thing about propane.. an out-of-stater visiting for vacation blew up his daughter cause he was a hack. NH was all set until these summer meatheads ruined it.

at epa-test.com $150 Mainstream Engineering Universal 608.. self-study and one 100 question test at your local HVAC dealer. I like the quick route.. cheaper and about 5 years faster. local school...

Ahh nice to wake up to actually helpful comments.. Ambients in NH have been in 90's lately.. and when you said check for air in the system does that only work for a rooftop unit (or one w/ evap and...

Finally... JP i think you might be coming around and in denial but OldSchoolMech may have misunderstood what i meant about the air (air cooder condenser) but thank you for the help i think i was...

wow so many posts and only 2 actually related to the question. typical from you a/c guys... hvac69 was most on asking about readings, and i still need to check the sc for him.. and jpsmith marginally...

It's storage management (My cover job when nothing is happening) but It's more than that- the company has restaurants all over the state as well as self-storages and residential buildings they rent...

It would be nice to hire a guide but my boss wants to stop paying the guide and pay me, and the guide was never too informative anyways.. he never listened to what i had to say because he always...