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I'll get in touch with my former co-worker (I'm now retired) who was much more involved in this project than I was and possibly send you an e-mail message with more info. But, for a quick answer, the...

Google "california labor laws overtime hours"

Keep records of your hours and dates.

You can hire an attorney and get some backpay.

Call the State Labor Board first if you want.

There are...

I'd recommend checking for condenser fan motor bearing play. If the shaft moves side to side even a tiny amount, it will overheat and shut off after running a few hours on a hot day.

Regarding...

http://www.trutechtools.com/SMAN4

I have a friend, who fortunately escaped injury, who was doing pre-start-up checks inside a larger air handler. He had verified with his meter the power was off. He had just finished working at the...

http://www.yellowjacket.com/sites/default/files/product_manuals/142993_D%20English.pdf

Per the info at Ritchie Engineering website in link above, the gas ballast should remain open until 1,000 -...

http://streamlight.com/education/guide.aspx

Everyone has their own likes & dislikes when it comes to flashlights. An air balancer friend of mine had a Streamlight flashlight that impressed me so I...

Just remember that the purpose of an inverted trap is to prevent the liquid refrigerant from draining by gravity from the coil into the compressor during the off cycle.

So, if the air handler is...

So, the seasoned tech blames the problem on you for not checking the compressor terminals, but he didn't check the terminals either until after he was ready to button things up and walk away!

And...

I've never used Fieldpiece instruments.

1. With the SMAN3, if a person wanted to measure temperature on a pipe larger than the pipe clamp is suitable for, is it possible to plug a Fluke temp...

If the kink causes "a little bit" of pressure drop, it MIGHT cause trouble on the hottest days.

Pressure drop in the liquid line reduces subcooling, sometimes to the point of flashing liquid into...

So you have 47 degrees of superheat at the compressor. That seems pretty high. I'd open the TXV to bring the SH down, which will also increase the suction pressure and provide more capacity out of...

If he had done the job correctly the first time, replacing the refrigerant would be unnecessary. I agree with all of the above. Now the entire system needs to be evacuated, not simply the line set...

A. A leak can lead to a compressor "failure", but if your compressor worked long enough to produce a cool suction line as you described, my "guess" is that the compressor is ok. Compressor...

Refrigerant line whistling may also be caused by excessive velocity, which is caused by undersized lines.

If the line is kinked, such as at the bend where the line enters or leaves the wall, this...

Google "Examples of osmosis".

When you read a definition of osmosis, don't stop reading after the first couple of sentences. Keep reading to understand what it means.

The semi-permeable...

I'm not sure what you mean by the phrase "Head pressure: 118F 83 + 35 = 118F"

Head pressure and High Side Pressure are the same, and pressure is in psig, not degrees F.

You indicate the...

Yellow Jacket Flexible Steel Hoses!

Order the length and diameter you want, then treat them with care and don't loan them out. Most of the times I've loaned mine, even to those I thought would...

How many people are having flow loss issues with the Liebert XDC Chillers that use R-407C to cool the pumped R-134a? Also, is there anyone who has NEVER had this occur?

We've determined multiple...

I see you posted your question almost two months ago but received no responses. Have you solved the problem yet?

What model is the equipment?

Does the controller allow you to set the humidity...

I agree regarding the Thermal and cold weather. It took me awhile to figure out the problem and it was quite frustrating to arrive at the job site on mornings when the temp was around 40 degrees F...

I was told the fittings are solderless and are not shark-bites

223472
These fittings were seen on R-410A discharge & liquid lines to join soft tubing for a Liebert rooftop condenser. The system has been operating for a few months, including during some 100+...

These fittings were seen on R-410A discharge & liquid lines to join soft tubing to a rooftop Liebert condenser that has been in operation a few months, including some 100+ degree weather.

What...

Have some of you determined which is the best method to connect refrigerant pressure controls to avoid leaks?

Copper capillary tubes or 1/4" copper tubing used to be the standard for the equipment...

r22eric,

Since this is your first post, I suppose you don't understand how the forums work, because you should start a new thread instead of beginning a new topic in the middle of another thread....

Keep in mind, the correct way to check net oil pressure is by checking oil pump discharge pressure and "Crankcase" pressure, which may be higher than "Suction" pressure if your compressor has...

Our water cooled condensing units are connected to a closed loop cooling tower. All of the condensers are at a level lower than both the return and supply mains, so the condensers remain full of...

I HAVE to ask this! Did you obtain subcooling by comparing saturation temp to the discharge pressure? I assume you did since you didn't include a "Liquid Line" pressure. Most condensers have enough...

Thank you.

Your responses have given me some ideas as to reasons for piping one way or the other. I've seen it done both ways, and was curious why some instructions state to install on the inlet...

Water-regulating valves controlled by refrigerant head pressure are recommended to be installed in the supply water line to a condenser. I've seen several installed many years ago that are in the...

If there is a 24 degree rise in the glycol/water temp through the condenser with 20 tons of cooling, you're not getting much more than 1 gpm per ton (about 22 gpm total). According to the Liebert DS...

You'll need to determine the glycol flow through the condenser. Also, the specific gravity & specific heat of the glycol/water mixture is needed.

Water flow is typically designed at 3 gpm per ton,...

I know a 3rd year apprentice who took the HVAC Mastery exam and passed with no preparation at all. He didn't know it was the UA STAR exam because it was given to help determine who would be allowed...

From what I've heard others say, the Nu-Calgon Nu-Seal product is a permanent sealant when used per instructions. It was used 10 years on nuclear submarines, and underwent extensive testing prior to...

The issues are with Liebert Deluxe & also DS 30 ton 4 step units containing Carlyle 06DF537 compressors with unloading that were shipped from March 1, 2007 - Oct 19, 2008.

Any compressor with a...

Even though the condenser water supply is colder than recommended, since you have the head pressure controlled with the water regulating valve, is the water temperature the real issue?

It seems to...

Domcort,

These units are not sitting on a data room floor like we typically find, but instead are in small rooms just outside the actual data room, sitting on the typical Liebert stands, so the...

Has anybody come up with a method to more easily replace the Carlyle 06D compressors in the Liebert Deluxe System 3 units, such as the model DH380A?

Thanks!

I don't have much experience, but my co-workers have taught me enough and shown me enough to know the importance of using a micron gauge.

This is one experience I personally saw that may help you...