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What you are looking for is this file. I posted the link earlier in another thread about this topic:
https://www.instrumart.com/assets/Megger-insulationtester.pdf

You need both. Learning the theory makes it easier to understand the practical part of the trade.

Guys, Megohm meters aka 'meggers' are not for finding shorts to ground. They are for determining insulation resistance, which is a totally different animal. For that you need 2 things, high voltage...

My pleasure, hope you find something useful there for you.

A few weeks ago I came upon this web site:
https://boilersinfo.com/books/hvac-books/

It has quite a few interesting books on it for free download. Some are a bit older already, but the principles...

What you noticed with that large compressor was the insulation getting polarised by the high voltage, increasing the insulation resistance. It is a sign of the insulation being in good condition....

I always use a Megaohm meter when I commission a new installation. I measure all the pumps and compressors in the system, including the cabling. Most of the time it is a requirement in the contract....

A good alternative is using an ink jet printer with refillable ink containers instead of cartridges. I have an HP 5810 now since a year, which I use almost daily. Filled the containers up once, and...

You might be in for a surprise. I have a 5 kWp system on my roof, and around noon at close to full load the closed loop DC voltage is approx 280V. That is a lot more nasty than 230 AC, let alone...

Sorry but I would not touch a live 460 system for anything else than measuring with proper equipment. I was trained on 11 kV equipment on the reefer ships when I was in the merchant navy, but this...

Yes, there is actually an MS Office for MacOS. And there is Excel, Word etc. for iPhone and iPad.
And when you are running a Linux system there is Open Office, which has the same components as MS...

It is hard to determine a rule of thumb, or a value of pressure difference which would indicate a dirty filter. Honestly, the only way is to find out. Start with a clean filter, measure the pressure...

I have seen people measure the pressure drop over the filter with U-tube pressure gauges before and after it, measuring mm water column. You need to establish what the pressure drop of a clean filter...

Use a little Kärcher unit or equivalent. That's what I see being used a lot here in the Philippines.
Handy at home as well for cleaning the mountain bike, quad, or just for cleaning molds and algae...

All the toilets here in the Philippines are equipped with those. And then there's often no paper.

I like the Getac laptops. They are rugged and designed with field service in mind. We used them on service jobs when I was in the marine business.
http://us.getac.com/index.html

Kärcher has some nice handy units. Not cheap, but they last a life time. I use it around the house as well for cleaning molds off the concrete, or mud off the bikes.

This speech nails it 100%. One of the better ones I have heard / seen. Thanks for sharing!

Ah, I get it. Bear in mind that the capacitors are calculated for the load they are to be serving. So just replacing with half the capacity will get you in trouble. What is your reason you want to...

Sorry, what exactly is your question?

Thank you all for your ideas and insights!

Thank you for your detailed post. You brought up a few valid points I actually did not even think off.

I live near Manila in the Philippines, where you need cooling all year around. A typical hotel or larger office building has 5 x 1000 RT chillers, with usually 4 running (80-90%) and one stand-by.
...

Ah yes, Lamao, Bataan. Nice. I live not far from Manila, in Cavite province. It's just a bit south of Metro Manila. I moved there from China in 2015 with my Filipina wife.
My first time in the...

Iridium actually still has the best area coverage, with the least dead spots. Airtime depends very much on the plan you choose. If you have a 10 min per month plan it's expensive with almost 5...

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Thanks, that could be the explanation. I am still quite new here :)

bump

What are the experiences here with automatic pipe cleaning systems with brushes for chiller condensers?

How do they compare with sponge balls, or twisted tape inserts?
Thanks!

Yeah, but they don't have a clue. But I still have a few more cement factories to go. :LOL:

You got THAT right. On top of that the plant is right next to the beach, so there is always wind. And the makeup water is slightly brackish.

Maybe not Jupiter, but some of its moons could be interesting. Like Europa for example.

That is a good question. The turbine part is actually a little Pelton wheel. We are only looking at the part from 50% of nominal pump speed to 100%. What we want to achieve is that the fan volume...

https://i.imgur.com/63TUI6O.jpg

https://i.imgur.com/EKZE4hN.jpg

This is my latest project, just finished a few weeks ago. It's a cooling tower for a cement factory in La Union in the...

Good Day,
I thought I had figured out how I could upload profile picture and avatar, made sure I had the right dimensions and file size for both but failed. I made several attempts, but no go.
Am I...

You can find people to help you with that on web sites like Upwork or Freelancer. You need to give a good description what you need and set a budget for that. We use these services for all kinds of...

Given the human nature, having exploring and testing new frontiers in the DNA so to speak, there is no doubt in my mind we should go. And we will.

Wow, what a beauty!! :)

OK, disregard that. I figured it out. :)

I notice this is an old thread, but maybe someone can point me in the right direction. Somehow I am not able to upload a profile picture. Is that because I am still a new guest, or have I overlooked...

You see it in many sectors of industry where the manufacturers do their utmost to lock in the after sales service markets by making it more and more difficult for the independent repairer to do the...