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TGO

TGO

Joined on March 20, 2004

Last Post on July 21, 2009

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Thanks Mike

@ July 14, 2005 8:49 PM in Weigh in of charges

> Although the entire system as a whole counts, you
> are only adding measureable ref. weight to the
> system as per manuf. charts because the liquid is
> measureable. Suction line is vapor so it is not
> considered. The addition of length to the L.L. is
> the actual chart you are adjusting to.
> Exmp...Longer or shorter. Keep in mind that the
> only true way to check is to measure sub-cooling
> or supper heat which ever applies. Hope this was
> helpful.

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Weigh in of charges

@ July 14, 2005 3:33 PM in Weigh in of charges

Hi Professor, When using the weight in method of charging do you need to figure the suction line as well as the liquid line? Will this change with different equiptment? I read through the installation guide for a new system, and it gives a chart for the addition of refergerant as .60 oz per foot of 3/8" liqid line but nothing for the suction line. What's the right thing to do? Thanks To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Thanks for the reply

@ July 13, 2005 6:57 PM in Subcooling

We had two thermometers on the liqid line, mine and the reps. I had an ambient temp of 72 and a liquid line temp of 74. He had a liquid line temp of 69 and was using my ambient temp reading. It didn't seem right to me that the liquid line could be cooler than the ambient temp, but I wanted to check with you before I tell the rep to get a new thermometer. Thanks To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Thanks for the reply

@ July 13, 2005 6:53 PM in Subcooling

> The purpose of the condenser is to reject system
> heat. PERIOD.
>
> The refrigerant leaves the
> compressor as a high temperature, high pressure
> supeheated vapor, which is hotter than the
> ambient temperature. As the refrigerant flows
> from the compressor to the condenser coil, heat
> transfers from the refrigerant to the air passing
> over the piping and condeser. Since high
> temperature flows to a lower temperature, the
> temperature of the refrigerant in the discharge
> line will drop.
>
> Given the laws of Physics, if
> the refrigerant in the line stopped flowing, it
> would eventually reach the temperature of the air
> surrounding the piping.
>
> Consider two glasses
> of water. Each glass contains 1 cup of water. The
> water in one cup is 50 degrees and the water in
> the other is 70 degrees. The air surrounding the
> cups is 40 degrees. If we mix the contents of the
> 2 cups, the water will be at a temperature of 60
> degrees. If the 60 degree water reamins in
> contact with the 40-degree ambient, the water
> will eventually reach a temperature of 40
> degrees. The water cannot cool to a temperature
> any lower than 40 degrees. Where would the water
> give up its heat to?
>
> So, in response to your
> question, if the liquid line temperature is lower
> than the outside ambient temperature you are
> defying the laws of Physcs. Since we know that
> such is not possible, either your thermometer is
> defective or there is a restriction in the liquid
> line.
>
> I would check the service valve on the
> condensing unit and make certain that the liquid
> line valve is open all the way. Simply cracking
> the valve open to allow refrigerant into the
> system on initial installation/startup can be the
> culprit for the problem your are experiencing.
> Keep me posted.

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Welcome Back!

@ July 12, 2005 7:18 PM in Just Got Back

Did you wander around South of the Boarder checking out the AC systems? Fall asleep on the beach dreaming of Pressure Enthalpy? Look at computers and think " I'll just check the wall real quick"? OK vacations over - back to work. ;-) To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Welcome Back!

@ July 12, 2005 7:13 PM in Just Got Back

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Welcome Back!

@ July 12, 2005 7:08 PM in Just Got Back

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Welcome Back!

@ July 12, 2005 7:08 PM in Just Got Back

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Subcooling

@ July 11, 2005 4:56 PM in Subcooling

On an air cooled condensing unit for a central air system can the measured temp of the liquid line (at the condensing unit) be lower than the ambient temp? If so by how much? Thanks To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Pans

@ July 8, 2005 11:30 AM in Newbie A/C question

Hi Mel, If your air handler is located above finished space, you want to have a pan under it. In the event that the air handler leaks water the secondary will catch it and prevent damage to your home. The drain line from the secondary should terminate where you will see water dripping and know there is a problem. You could also install a switch that will turn off the A/C if there is water in the pan. As to re-routing the drain lines, if you aren't 100% sure of how to do it call in a pro. If you want to do the work yourself, find someone who will show you what to do - it will be worth the price of the service call. Good Luck To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Duct sizing classes

@ July 1, 2005 10:13 AM in Duct sizing classes

Hello Professor, Any plans for teaching classes on duct sizing and layout? Thanks Tom To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Thanks Professor

@ July 1, 2005 10:09 AM in Checking system charge on start up

The system in question is rated at 12 Seer, I was suprised to see a piston type metering device but I verified that the system componets were matched and correct. You mentioned that the condensor saturation temp should be 30 to 35 degrees higher than outside air temp in a non high eff system. What is the cut off point for high eff? How much will the condensor saturation temp change as the SEER goes up? Thanks Tom To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Checking system charge on start up

@ June 29, 2005 2:12 PM in Checking system charge on start up

Hi Professor, When starting up a new installation with a fixed bore metering device, and the indoor air temp is very high (85 to 90) what is the best method to check the system charge? What about with a TXV? How much will humidity affect the readings? Thanks in advance To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Hi Dan,

@ June 19, 2005 10:20 AM in Dan's Blog

Your blog makes a good point about correcting mistakes, it also points out that more often than not it doesn't happen. Then (as you said) the lobster pots keep on killing. What I would like to know is how can you avoid this? The books and pamphlets are being given out by people who believe they contain valid information and will be helpful. The people who are reading them are doing so because they want to learn to do things the right way and believe they are doing so. Can you imagine the frustration when you follow a "sanctioned" procedure or method and then find out its wrong? I know of more than one tech who simply gave up and will no longer try to educate themselves - whats the point, you can't trust anything you read anyway. I know the information you have in your books is accurate, I consider them to be the final word on the subjects you address. I also know that I can come here with any questions I have about what you have written and you will answer me until the concept has penatrated my thick teutonic skull. There are a handfull of other authors who will do the same - George Lanthier, Timmie McElwain, and Eugene Silberstein come to mind. But what about the rest? How can you be sure the information you are getting is correct? Education is very important, it is also expensive and time consuming. How can you be sure that you are not wasting time and effort learning the wrong way? I am curious to see what other will have to say about this and hope that someone will have a solutuion to the problem. Thanks for all you do Tom To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Eugene,

@ May 29, 2005 10:08 AM in CHECK OUT THIS NICE REVIEW (Dan H.)

I hope all works out with your Mom. I wish her a speedy recovery and I know the Prince made the right choices. My thoughts will be with you both. Thanks Tom To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Eugene,

@ May 29, 2005 10:01 AM in CHECK OUT THIS NICE REVIEW (Dan H.)

> You guys just made my night! I just returned
> from the hospital a short while ago feeling
> somehat heavyhearted as my mother had just
> undergone bypass surgery on Friday. Although the
> procedure went as well as could be expected, it
> is always difficult to see loved ones in pain.
> As many of you guys will agree, reading the posts
> on Dan's site always provide an outlet and, quite
> often, a source of entertainment. This evening
> was no exception but was also quite
> different!
>
> Reading Tom's review of the air
> conditioning class he had just completed with me
> brought a smile to my face, knowing that the work
> I do is appreciated and valued by those to whom I
> am committed. Being an educator is a rewarding
> and challenging profession that, as with other
> career paths, has its ups and downs. Watching
> those I teach learn is an amazing expeience,
> especially knowing that the knowledge I am
> imparting will have lifelong effects on the
> industry.
>
> I am truly humbled by the positive
> comments made by all of you guys and I will do my
> best to continue to live up to them.

turns out well for your Mom. I know the situation you are it and my thoughts are with you both. Tom To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Thanks George

@ May 29, 2005 10:00 AM in CHECK OUT THIS NICE REVIEW (Dan H.)

That means a lot coming from you. See you at Carlin U To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Thanks George

@ May 29, 2005 9:57 AM in CHECK OUT THIS NICE REVIEW (Dan H.)

> the Professor, I do know Tom and he is a class
> act, FACT! If he says the instructor is good, he
> is!

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Replacemant coils

@ May 27, 2005 8:10 AM in hot/chilled water coil

should not be hard to find. I would be more concerned about why they went bad in the first place. Is there anti-freeze in the system? Has it been tested? You need to find the cause of the failures before the rest of the system is damaged any further. To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Lack of support

@ May 27, 2005 8:05 AM in Un-dropped header

Hi Ron, Nice work on the boiler - like always. I know what you mean about lack of support from a MFG, any chance your company will change brands of boiler for steam? I know you have been using Burnham for hot water - any reason you aren't using them for steam? To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Congratulations

@ May 24, 2005 8:31 AM in IT'S ANOTHER GIRL!!!!!!!

May she have a long, healthy, and prosperous life! Best to you, Barbara, and the rest of the Clan. Tom To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Try using

@ May 21, 2005 10:44 AM in Refrigeration fittings VS water fittings

Blockade. It is a brazing rod so you have to use high temps, but it will flow more like a solder. To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
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