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You both could be correct, it depends on the operating conditions.

It depends on the actual temps of the discharge and suction lines. I personally wouldn't condemn an r-valve for even a 10* rise...

The infamous Rheem "shorty". With this design, they eliminated the heater section that all other fan/coils have.

By doing this they also removed the 8-10 inches of same size duct to the blower...

I use Wrightsoft and have used Elitesoft before. They are both ACCA approved and easy to use especially if you know how to do loads by hand.

They cost a hell of alot more than others, but I think...

Poor sick start capacitor...it puuked itself to death :(

Do you estimate dry air mass flow and use this equation? btu/hr = ḿa(h1-h2)

If not, what range of delta h are you looking for as a pass/fail. Do you have any tables or charts that you use (and...

LMAO!

Me thinks Mark is referring to zeotropic refrigerants that don't have a single saturation temperature that corresponds to a single saturation pressure. Instead, you have a saturation pressure "range"...

Now that I've stopped laughing...

Drainage is definitely not improved. I've had a few callbacks because I failed to discover a double trapped condensate drain. They were never intentional though,...

The science is sound.

A scalpel in the hand of a trained surgeon is an effective tool, but in the hands of a child... would be dangerous.

If you feel insulted by this statement, you should ask...

The problem you describe is water in the ducts, and is due to warm moist air from the space migrating into and condensing inside the ducts.

Although it's not clear from the first post, I believe...

One often overlooked problem is low airflow.

Low airflow causes lower air temps.

This makes everything colder than design.

So...things that would not sweat with proper airflow...do

More info is needed.

If you do not have a certified "matched" system then a charge imbalance is a typical issue and one that is not easily correctable. Installing the correct coil may be the best...

There are two basic reasons your duct (or anything else) could be sweating.

1. Your duct is too cold.

2. The surrounding air is too humid.

In a nutshell, the surface achieves a temperature...

I give a warranty because I've correctly diagnosed micro leaks and have gotten all the moisture out. Works every time

Go for it, you're not violating any warranties or codes, you've got the OK from your customer.

Find out why the original compressor failed. 10 years is not a long life. Heck, periodically flooded...

Good tip!

Be aware that metal tape, rated for duct board, that is not applied to a clean surface with a squeegee... is unlikely to remain applied. It's one of the reasons that ductboard gets a bad...

New formulations of this sealant include a chemical dyer which will eliminate 20 drops of water, but it's ultimately up to you to get all the moisture out.

If you're in doubt about whether the...

jimmyed,

Notice the "divot" to the left of the split?

Is the underside of the split concave?

Is this a heat pump? Are the fins crinkled?

It looks as if the tube has had exterior freeze...

5 year parts and labor is standard on all my repairs. I couldn't have successfully offered this 10 years ago, I had too much to learn.

I can't stress enough the fact that if there is any...

Overcharging, low airflow, or any cause of flooding, will cause premature compressor wear and lockups.

Long lines, elevation, hard shut-off TXVs, and power issues, can require start kits.

Can't...

I like!

Rated this thread 5 stars :)

On systems that I've correctly diagnosed as micro-leaks in an evaporator (difficult to determine), successfully removed all the moisture, and applied the sealant during "wet coil seasons", it has...

Maybe a poor choice of words on my part. I mean no offence.

Rarely are customers or situations the same. I have no rules as to whether I suggest repair or replace, but every price to replace has a...

Someday I may buy some too.

It sounds like you have put an amp meter on it to verify, I have not, so I must entertain your position. I'm gonna ponder this for awhile. (i.e. do some more research)