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O is closed to R anytime the thermostat is in the "Cool" mode ("B" if in "Heat"). If "O is wired and shorted to "G" it would cause his symptoms.

Also if the O terminal on the stat is mistaken for...

X2 What Scotty says.

Sounds like the fan control device is getting 24v from the Thermostats "O" terminal.

You probably understand that you do not use Target Superheat for TXV systems now and your system may very well be running fine. But more information is needed to Really know for sure. I've taken the...

Wow, that doesn't jive with the readings you posted. Could it be that the accumulator was holding a significant amount of refrigerant while you were recording your values?

What was the problem that you found? I guessed at several wet bulb temps with my Air Conditioner Analyzer and it always diagnosed:

"TXV underfeeding/restricted or other restriction downstream of...

You have to know what the sensible and latent loads of the building are. Room by room if you wish to do a duct design based on room airflow.

Once you know what your Total Load is... you then...

Yes, what PHM said. Also return wet bulb is essential.

Fill in this form: http://efficientcomfort.net/asp/ACanalyzer_Web/ACanalyzer_Web.asp, it will give you a lot of info about what's going on...

X2 what doug1111 said

Long ago... when i used to let tanks roll around my van without any caps... a tank hit something and the valve opened just enough to not make a noise I could hear.

I had...

It is either a weak compressor OR the piston is stuck in the unseated position, not there at all or very much too big.

The piston issue can be easily identified by pumping down, opening the valve...

Fuses are like light bulbs and capacitors... they have a limited life.

If you only change the "blown" one and leave the other 2 (or 3) of the same age... you are pretty much guaranteeing a call...

Measuring amp draw while "testing" the TXV is just another way that gives you limited information. Adding up all the info you have obtained, it still leaves you with a guess.

Use what you have...

Changing a Sporlan TXV powerhead is a simple fix but it should only be done by a Professional. There is a very real risk of personal injury.

Diagnosing by sound alone is merely a guess. You may be...

The dampers axle should have a "mark" on it's end. If the mark is parallel with the duct, it is open. If it's perpendicular, it's closed.

Per site rules, we aren't able to give DIY advice. I don't...

X2

Just not an easy concept to explain. I think this 5:24 minute video does an excellent job.

https://www.youtube.com/watch?v=CL5cgXwKUXc

X2

Check for "side to side play" in the motor shaft. This would indicate worn bearings. This could be your intermittent failure. First the condenser fan goes out on internal overload and then the...

The drain should not plug up between annual maintenance visit. if it does, call them back out.

This is a result of the Master Bedroom not getting enough airflow.

If the Master Bedroom door is open or otherwise allowing an adequate path to return the air back to the fan/coil, then your issue...

AEW and BeenThere are spot on but to elaborate further:

Relative Humidity is the amount of moisture in the air compared to how much it could possibly hold at a given temperature.

Air will...

Condenser was 38 to 48 degrees above ambient? This is not good.

Something is amiss with the numbers you posted. A 97* condenser with 11.4* subcooling gives you an 85.6* liquid line. You cannot have a liquid line that is colder than the outdoor temperature (95.5)...

The duct design and application is responsible for making every room in the house the same temperature. It takes a precision engineered design, adherence to the plan and great workmanship to achieve...

A gross overcharge is one reason.

Is there an accumulator in the condensing unit? The suction pressure will correspond to the temperature of the accumulator as long as it has liquid in it (saturation pressure/temperature...

I've seen larger AHU's that were an AHRI match to a smaller condenser, but never the other way around. I also have seen situations like yours where the system "worked" well enough to prevent customer...

Obviously, the capacitor was the reason for the service call. As TACKERDOWN says, "The readings after the cap replacement would be helpful".

As for the TXV... a loss of bulb charge or a broken...

A negative superheat is not possible, check your thermometer and pressure gauge calibration

Get the indoor conditions at or below 88 dry bub and 80 wet bulb then use this Analyzer: http://efficientcomfort.net/asp/ACanalyzer_Web/ACanalyzer_Web.asp

I have an online calculator that will tell you your CFM/TON. It's derived from the Enthalpy Difference and is very accurate (uses latest formulas from ASHRAE). You just need Wet Bulb, Dew Point or...

If you're not already on the lowest speed for cooling, do you have to change to motor just to lower the speed when you want to?

Is manually (or with a relay) changing the speed tap not an option?

It is GREE, a Chinese company and the largest manufacturer of A/C units in the world.

I recently spec'ed and helped install an Ameristar condenser and coil. It was purchased from an American...

For our personal systems I'm all for guessing at a low temperature. If we wake up to a cold house, we can just bump up the change over temp.

Guessing at a high temperature for our customers...

You are also correct, but... A Master HVAC Tradesman license is obtained by taking an open book test that 90+% pertains only to code issues and not about how electricity, refrigerant or airflow...

Impressive! Are you in a Union? What state are you in? Surely not Virginia, here all you need is the EPA certificate and voila!... you're an HVAC Technician... learning (and hacking) as you go. :(

Thanks for getting me to rethink this. I agree now that a R410a TXV with R22 will swing open way more than it should. May not flood under all conditions but will definitely cause a removal of...

Rookie??? I think not!

I say your post is worthy of "Professional" status. You must have had an excellent electrical education. In many ways the understanding of "Electrical" flow can be applied...

I've just been overwhelmed with work, family etc. You know how it can be.

Txv's use the suction pressure along with the spring pressure against the bulb pressure.

I've never done or seen a 410a...

In many cases with older systems... they worked well enough in the beginning, even if they never had the correct airflow to begin with that would support the equipment's rated capacity.

Over-sized...

See if this diagram helps.

Basically if any safety switch opens (HPC, S1, S2, S3), the current will follow the path of least resistance and energize the lockout relay(LO). Even if the safety...

I've never done it or seen it, but because of the great difference in operating pressures... I'm sure a 410a txv with r-22 refrigerant will act like a restricted/non-opening txv. The spring pressure...

Hey Vin. I use a fluke 52-II with two 801-pk thermocouple clamps (fast response) for pipe measurements.

For refer pressure... 1% accurate analog gauges by Ritchie Yellow Jacket (which I keep...

SMAN460 and SPD2 measurements may be valid but their calculations and diagnostics cannot be relied upon.

Do a handstand against the building, breath deep and exhale until you feel better... careful that your arms don't give out and you break your neck. :grin2:

... and he ended his TV interview with... "Hi Mom"

But we all know who shares the credit! :)

Way to go Dad!!!

I practiced with the smallest drill bit I could find. I've never attempted a 1/8" hole in aluminum. The solder is very runny. For a big hole, I would apply a piece of aluminum as a patch.

It...

X2

I've used the kit from Harris and also the kit from Uniweld. Each is a bottle of flux and a coil of solder.

Another tip: Apply the solder as the flux starts to boil. Don't heat the leak area...

Allow at least 5 minutes for system to respond, if not... Honeywell has a 1-800 customer line. It should be buried somewhere in the install manual.

P.S. Very Very Important!!!

Don't throw that...

Am I the only one who solders these?

It is tough to control the heat. You have to get the aluminum hot enough the melt the solder but not too hot for to long which evaporates the necessary flux....

A square-to-round would be the best fitting. 19x11 to 18" with a length of 2.5 equivalent duct diameters long (including the length of the heater bay). It's not a cheap fitting but at least the...

Proper Outlet Connections
On most jobs there is not enough space at the fan outlet to install a straight duct that is equal to a 100 percent-effective duct length. However the duct designer and the...