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Thanks for the comment. It was the nucklehead maintenance guy's bad luck when I appeared here, having been a board certified professional mechanical engineering internal consultant for DuPont, fixing...

I lucked out, the H&V guy from Honeywell? was here on other work, whom I had met previously, and I got him to get the circulation running again. He also had the code to unlock the thermostat.
...

The standard is not mandatory, and a quick search failed to see if it was made mandatory in Delaware, thanks for providing that standard.

In the rooms, they use Amana 12k & 9K (cooling) BTU heat pumps, with outside air doors shut. The 12K unit in my main room would overshoot the heat set point by 3-5 degrees, requiring constant...

Rider, you are right the units are on the roof, not in the attic. I've seen the large, counterweighted cranes used when replacing the units. It has to be done from the back side of the building, so...

Sunrise Senior Living, Wilmington 19803. Not recomended for youre elders. The director could not manage a McDonalds window.

Thanks Juan, some more input. System consists of very large attic mounted H&V units, controlled by a thermostat for each zone, no co2 control. It wasn't an economizer that was the problem, much more...

I reside in Sunrise Senior Living, and the mainenance guy stopped full time air circulation at the zone I'm in. Resident's have their own room heat pumps, but the halls & a large activity room have...

Thanks for your reply. There is an attic space above each bedroom. To run ducts all the way back to the blower inlet would be a huge project. Perhaps just an attic bypass across the separating wall...

I'm in Delaware with a 'holiday split level' house and forced air ventilation. Bedrooms at the top level have no return air ducts, and there is only a ~1 inch air gap below the doors, and that drops...

Hi, I've got a 56 yo split with 3 floors & 1/2 basement, about 1500 nominal sq-ft. There are 2 main returns on 3rd floor (bedrooms) and the main 2nd floor, each 25" x 5" grill area, and a small 11"...

My bro has an older house, with 8 ft ceilings, that had hot water heat and no central AC. He had a Mitsu with variable speed comp installed in attic for 2nd flr, with 3 bedroom ceiling...

They got the new evaporator up the stairs by removing the trim around the ceiling opening.

I fully agree with codes, maintained by the industry. Some that come to mind:

ASME ------ For pressure vessel design, and other joint uses.
ASTM ------ Materials and test procedures ( good...

One correction where I was not clear enough: They removed the 8 monnth old evaporator for reasons unknown (it was not leaking), and they left it in the attic, after they found that they could not...

Yes, they removed the 8 month old evaporator before they brought up the new evaporator. I had begged Sam the boss from Heck, not to mess with the evaporator, because nobody said it was bad, and ther...

If the work load is light for a couple of days, I though major warranty work would be welcomed.

The system was not loosing 410A, and the evap was only 8 months old. He felt the dryers were the only problem, based on the pressure drop across them.

Is it possible that on issue begot the other?...

Guys, I'm in the process of finding a new contractor, for servicing my Mom's 3T AC system in Florida.

And I appreciate all the help so far, but they have pulled a new one on me/Mom.

She lost...

Vaccum Meter

I talked to the tech super yesterday. I asked about the final vacuum test, and he said they pull a vacuum for about 30 minutes, followed by a 10 min hold ... if no change it's leak...

Thanks for the detailed explanation Shophound. I now have enough background knowledge to ask the supervisor what was done.

And collectively, HVAC-Talk has got me off the freeze-stat theme .......

Thanks for the pos. I have thought about that cycling issue, and I spent an hour trying to find a freeze-stat with a simple warning lite that my mother could see, but I did not find anything with a...

Thanks pecmsg. So your saying they need to have a vacuum pump capable of pulling down to a low micron reading, that only a micro meter can read? What should you pull on a 3T unit in Florida heat?
...

Well, this freeze problem was "fixed" by replacing a compressor that was leaking where the power lines entered.

Then, 3 days later, she lost cooling again !!!! This was from a coolant leak at a...

Thanks, I'll tell them to do exactly that !

BTW, Happy Father's Day to those have/had kids and/or Dads. To the rest, happy Sunday!

Nascar on TNT @ 1:30p

She had a new compressor installed Wednesday the 12th (leak where power line enters sealed compressor hsg), and I called her Saturday,15th to check-up.

Outdoor unit was running and it was 80...

Don't think so.

Shortly after they (Atzil) installed a new system with a new programable t-stat, 3 years ago, my Mom asked them to put her old analog t-stat back in. After that, she had two years...

The Tech found a leak where the power cable enters the sealed compressor. System was topped off and new compessor is scheduled to be installed 1st call tomorrow. I told the dispatcher that it was...

All of you that suspected the duct size might be too small for a 5T unit win a prize ... She has a 3T unit ! My bad, ex GF had a 5T.

She/they have had 5T units for 20 years w/o icing issues until the last 3 years, when a new AC 5T system was installed and the made a mistake on the dip switch settings that kept the airflow too low....

I know it should not happen. They have been down there about 20 years, and the 2 prior 5T systems never had icing issues, so I think the duct sizing is ok.

I know the sensor should not be needed,...

Thanks for the reply udarrel.

She has a contract with Aztil, who install the new matched system last year.

I had them check the fan speed and it was correctly on the high setting (2 speed).
...

The reason I ask is that my elderly Mother lives alone in her house in Florida, and too often she has suffered no-cooling due to icing of the A coil.

Most of the trouble for the last 3 years was...

Look closer grasshopper :) , the aluminum hub was solid 3-d elements, as was the 5 mil layer of fatigue proof epoxy (per my testing) that bonded the composite to the aluminum.



I did that...

Ever sell a stand alone box that interfaces with thermostat and 24V connections at the air handler, like the ICM253 ?

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That's super hard core, ~12% body mass. I did about 4K miles a year on road bike training/group-rides, and several races a year on the mountain bike.

It's nice when work mixes with a hobby. I...

I checked out racing a stock 600cc class (US) , before track days existed. I saw too many guys going down, and knew I had to work so this was not for me. At that time I had a new 1976 Triumph Trident...

Thanks for the informative reply. As I have monitered the temperature at the duct discharge (both with simple indoor/outdoor unit, and an industrial radiant sensor, CSI-505) it takes 1-2 minutes to...

CraziFuzzy, I apologize for starting this thread if it breaks the rules. I just spent 30 minutes reading all the many rules, and thought I knew how to post.

I really did not think it was a DIY...

I have an old gas forced-hot-air furnace, and an ac system sized by a pro and installed by me.

My system had no extended blower fan operation after compressor stopped, leaving about 56 degF air in...