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In case your customer might like to add a variable frequency drive one day... make sure everyone understands the system is a "corner grounded, delta system" and follow the VFD installation...

On the "Multistack" water cooled chillers, the condenser coils are the same BPHE type. However water from the tower enters the bottom of the HEs. I think the heat transfer works well in either...

Been using Turbo Torch for brazing commercial work for over 15 years.

That's with just the Turbo Torch tips and acetylene only - no O2. Installed two 8-ton computer room AC units w/ remote...

Pretty sure one side of the 24v transformer is supposed to be grounded, if so make sure it's well grounded - no paint in between.

How many stages (contactors) can turn at once - can the...

Yep.

I've seen an extra section of pipe installed just past the chiller to make it easier for access and inspection. Remove the blank and the screens are right there.

Need a long hook to gently...

Sorry guys, I know it's been a while.

Last I heard the electricians (different company) were having trouble getting circuit breakers which feeds this buildings panel. Until then - no power. The...

Since it seems arc flash PPE is a requirement now, does anyone know if the HRC value increases with the more layers of arc flash rated clothing one wears? Does HRC2 long-sleeve shirt + HRC2 jacket =...

Never seen a 1/16'' tube used for TXV equalization before, always 1/4" - wouldn't even hesitate to change this. If the equalization tube plugs or can't ventillate itself, the result would be the...

You can lead a horse to water...

I would recommission the drive, no doubt about it.

Who knows maybe someone was curious and changed a parameter by mistake and doesn't want to say.

Make sure the switching frequency is not se...

How much load is there on the unit? What's the return air temp? Is the air filter full? How's the airflow? Is the termostat in a good location? What's the temp setpoint?

Answer these questions and...

Good answer.

Carrier - fusible plug. Notorious for leaks.

Replace it when you can. In the meantime, fill it with 95/5 solder - melts around 450F.

Don't just cap it off - dangerous.

Humid weather in Toronto? The higher the humidity - the more frost there'll be. Need to set the defrost timer to whatever works. Should only have frost forming, not ice remaining. If that's the case...

Been there too. Seems to be a design problem - happens often on small bore shafts with long spans. Shaft will "whip" with the smallest amount of fan unbalance.

If you can't have the fan (shaft,...

Most people don't concern themselves with this sort of thing for a small fan like this. If there's trouble, there would be other symptoms... vibration, bad bearings, noise... then troubleshoot from...

We put in the press transducer and temp sensor for SH calculation and an EEV, coil and air sensors too of course. Once it's up, I think the customer will go for the network connection so they can...

I installed one last week for the first time for a new 1200 sqft freezer. Start up and commissioning next week.

It better work is all I can say.

Certainly emergency circumstances will create crazy ideas, but when we have a choice to do the right thing as mechanics, we ought to.

Here's a good article on the topic.

Yes I remember Bernoulli's Principle from my industrial gas fitter's course, but I'm not sure it applies in a case like this. I can't think of any part of a refrigeration system that would form a...

No way. I wouldn't believe that even if the unit somehow ran under water.

Moisture has a mass and it moves by force like everything else. Until the forces equalize, moisture will stay where most...

Normally, domestic water or chilled water cooled condensers will have a head pressure regulating valve installed on the water outlet of the coil. When the unit starts and the head pressure builds the...

Gonna need two motors soon!

From a deep vacuum, weigh in your charge man! Why on earth wouldn't you? Read the Fujitsu IOM. End of story.

461pat, find and read the IOM for this unit. If I remember right, a new unit in cooling mode should have 11-14 deg F rise across the source side piping and 8-10 deg F drop in heating mode. This must...