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Mazak,
Your Pro Membership application has been received and all looks good. Well done!
I will send it out to The Committee for a vote later this morning, so I'll be back at you with the results...

masak,

I haven't received an application from you. However, recently I received documents with no accompanying application.

You should submit another application along with the required...

Me too;)



OK, I got that.



In my experience it's possible to have an evaporator superheat which is greater than the evaporator TD...ie, if you have a 35°F box and 25°F evaporator...

Hey, sorry. I read it and thought I had replied. It's possible I forgot to hit Submit. That kind of f-up happens more often than I'd like these days. ;)

Climacheck isn't something I was aware...

Sorry, but in my experience I have only used Sporlan or Also (Emerson) expansion valves and neither of them use evaporator superheat as a parameter in valve selection. So when you ask about how...

While I agree only an OEM trap will fit, but I've seen cases where the drain was reduced to 1" to accomodate a running trap.

Bob, you're mixing up you're terms and making a simple selection procedure much more difficult,

The static superheat value has no relationship to the valve's rated capacity, so disregard it when...

It's basically the same material as the pipe insulation but it's in sheet form. Here's a link: https://www.armacell.us/products/aparmaflexaparmaflexfs/

I haven't read his book, but I've watched most of his YouTube videos. He explains how we're being scammed through our health insurance and how their Medicare advantage and Supplement plans simply...

I started a thread some time ago about how to diagnose a cap tube system with what I call the Touchy Feely method, using only your sense of touch...ie, no tools.
...

You can use the Tecumseh Cap tube app that I used and select .042", which is the closest size J.B has.
Or you can use J.B.'s resizing chart to find the equivalent length of .042" cap tube:
...

The standard box temperature for an ice merchandiser is 20°F. I usually use a +10°F evaporator temperature for these cap tube selections.

The performance data sheet for a Tecumseh AEA4440 goes...

For a How-To guide to get rid of the OneDrive popups go here: https://www.howtogeek.com/342550/get-rid-of-the-annoying-microsoft-onedrive-sign-in-popup/

The 04 orifice looks good for a quick selection, but before finalizing your job planning it's always a good idea to do a longhand selection using the manufacturer's selection procedure. I've done a...

E&E, the QR3-112 will work fine. I agree at 2°C (35°F) box temperature it will run a higher TD of about 8.2°C (15°F) as well as a higher capacity of about 7750 w. A TD of 8.2°C (15°F) is quite...

Why is it in this right-hand dominant, righty-tighty / lefty-loosey world do I find so many twist ties that have been twisted on counter-clockwise?
Is it because bakeries somehow attract lefties?

Wow, I really messed up in my numbers above. :eek:
I think I tripped interpreting my scribbled calculations likely due to my Metric disabilities.
The last paragraph should read:

The medium...

I can see that the original compressor and evaporator would be a decent match at an evaporator temperature of approximately -23°C (-10°F). This was assuming the evaporator capacity of 5600 watts ...

Dad summed up the history of HVAC-Talk and Snuffy here:
https://hvac-talk.com/vbb/showthread.php?2214301-Sold-again-Welcome-to-Endeavor-Business-Media-!!

One great thing about Packless is they will help you with the proper selection of heat exchanger. So if you need a minimum of 20°F superheat at the compressor, they can size it for you.

They say...

To have 3°F superheat at the evaporator outlet and 0°F superheat after the accumulator makes no sense, unless the accumulator is metering back some liquid from a recent liquid slug.

What is the...

I've seen combo cooler/freezer walk-ins where the cooler had no floor and had 4" high floor screed sections to make up the difference.

As crazzycajun suggested, contact the manufacturer and ask...

Here's a good read from Fluke on HVAC motors Insulation Resistance Testing (IRT):

https://www.fluke.com/en/learn/blog/hvac/insulation-resistance-and-electrical-testing-for-hvac-compressor-motors

I don't recall posting that video, but I do have that publication by Megger:

819495

The refrigerant is a blend which probably contains R404A and several other components. Such refrigerants are typically proprietary so it is only available from its manufacturer.

I suggest you...

The nominal pressure drop for an expansion valve isn't fixed at 100 psi. For R404A at 40°F evaporator temperature it's 100 psi, but at 20°F it's 125 psi and at -20°F it's 150 psi. The temperature of...

Scroll down the page to the capacity chart. I selected -20°F SST at 95°F ambient. I notice now I got the NDB50 capacity wrong. I was in the wrong column. Oops!
It should have been 217,094/2 or...

It's impossible to put numbers on something like this. That 5% number is just a typical oil circulation rate that I've seen used quite often when describing a pumper. Also higher compression ratios...

The unit in your pic shows a single wide NSB model. The 50 hp unit is a double wide NDB, so there's plenty of room for two compressors.

819375819376

This isn't referring to the oil pump, but rather it's about the amount of oil leaving the compressor due to worn rings, pistons and/or cylinders. The normal amount of oil leaving is about 1% whereas...

That's a good point. I mentioned stranding of oil in the receiver with mixtures of mineral oil and POE, but I've read that stranding can happen with systems with very high oil circulation. The oil...

One circuit of a 40 hp condensing unit at -20°F/ 95°F ambient will do 81,510 Btuh. The 2 5/8"" suction line velocity would be 1481 FPM and the pressure drop over 100 ft would be 0.3 psi.

One...

https://century-refrigeration.com/wp-content/uploads/2017/05/NSB-404-507.pdf

Discharge on a condensing unit is factory piping within the unit, not liquid and suction which are field piping.

I read that to mean liquid line and suction line.... 1 1/8" / 2 5/8"

Is there a possibility of this circuit's oil having a mix of mineral oil and as well as POE, such as if someone inadvertently added mineral oil instead of POE sometime during all of these service...

What you describe is not oil migration, it sounds to me to be oil loss...most likely from the multiple header failures. (I assume these were discharge header cracks.)

What type of compressors and...

Most likely, if there is such a tool as you describe, it's only made by Emerson and not available for resale.

I've never had a need for one and if I had, the timely and least costly solution for...

I've done it on ocaission while waiting for the OEM temperature control and had no issues.

The one thing I can say about it though, is as the box temperature drops, the compressor's going to see...

I agree we fridgies tend not to pay much attention to subcooling, but there are times when it can be a valuable troubleshooting tool...and this is one of them.

I see this thread as an example of...

Basically the effect of the mechanical subcooling supplied to the case would have little to no difference in the required conditions at the case. The added subcooling is used for system capacity...

Tyler Refrigeration specified suction stop solenoids for some of their cases with conventional or single compressors. They didn't result in floodback or slugging.

If you think about it, during...

Based on 3000 Btuh at -10°F SST and 120°F SCT with R404A, a .052" ID x 95" cap tube with 36" of heat exchange length will work well.


818884

You're correct to have heat exchange between the cap tube and suction line for the added subcooling, but for the wrong reasoning.

The subcooling gained from this heat exchange doesn't increase the...

When there's a possibility of hydrostatic failure of liquid line piping or component, it's common to install a differential pressure type relief valve. If there's a solenoid valve downstream of a...

In the 50's and 60's my father kept a dozen or so spare motors on the shelf at the shop. They were 1/4 hp up to maybe 3 hp.
Whenever a customer's motor died they were installed as "loaners" while...

What is the Tecumseh condensing unit's model number?

Go to Tecumseh Boxload page, select Condensing Unit Data Sheets and scroll down the dropdown menu to find the model. It'll give you what the...

What is the model number of the existing compressor?

If you think in terms of temperature instead of pressure, then it's much easier to estimate what the conditions should be regardless of what refrigerant you have.

So the question should be: What...

Your link worked, but this one is more direct: https://icemeister.net/backroom/wp-content/uploads/2015/04/AndySchoen_A-Modern-Method-of-Properly-Sizing-Capillary-Tubes.pdf