[AT] AT Digest, Vol 56, Issue 1

Sat Sep 3 21:24:07 PDT 2022

After hours of hunting  for a replacement pump, that had the required 
30gpm at 0 0head and 32ft of head at 0 output, I found one at Grainger 
in KC mo.  However, Fed Ex brought it to OKC on Friday but left it in 
their distribution center.  Grainger customer service help at the 
counter ordered another one for me to be delivered today before 12noon.  
It arrived and I spent 7 hours re-plumbing my installation in my 
Mechanical room.  My lead in pipes to the energy field are 1in poly 
pipe, with several ells and tees on the input side, and then 3/4 pex on 
the output side.  It worked for 12 years, but was inefficient after I 
ran the numbers on the head loss at 10gpm for a 3 ton unit.,  My energy 
field is 3000 ft of 2in pipe in the ground at 6-8ft of depth.  There is 
a foot of sane above and below the pipe in the ditch.  There are 2 pipes 
in each of 3 ditches all connected in series.  The calculations figure 
18 ft of head in the energy field at 10gpm. There also was an additional 
9.5 ft of head in the connections at the unit.  I changed everything 
over to 1-1/4 through the pump.  I also installed thermometers at the 
input and outlet.  I could not find an affordable flow meter that would 
not restrict  flow.  It now runs, and I have 82 degree water entering 
and 91 exiting.  The output is cool air and hopefully the house will be 
cool by tonight.  I also found a leak in the return air duct that is 
pulling outside air, so that is the next project.  The return duct was 
the flexible installed in 1985.  the ceiling joists are part of the roof 
trusses and there was 24inches of insulation blown in the attic.  I need 
to find some small guys to replace the duct. The servicing dealer never 
returned my call after charging me $165 to tell me they did not have a 
clue.  I know it was not a real sanitary installation, but the first 
unit worked for 25 years until struck by lightning, and this one worked 
good up until a year ago when I should have added freon.  I added some 
R410 and it now works fine.

Cecil in OKla

On 9/3/2022 6:55 PM, Email Service wrote:
>
> Cecil,
>
> I have a 5 ton and a 2 ½ ton geothermal systems in our house and have 
> experienced some of the same issues with equipment and inept service 
> people.  Some things that I installed to help diagnose problems are: 
>  Install thermocouples (taped and insulated) on the enterring and 
> leaving water lines  and duct thermometers on the entering and leaving 
> coil air. This information and the installation performance charts 
> help with finding the problem.
>
> The circulation pumps are 1/6 HP Grundfos one the 21/2 ton and 2 1/6 
> HP on the 5 tom sized for approx. 3 GPM per ton’
>
> Joe Morgan
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for 
> Windows
>
> *From: *at-request at lists.antique-tractor.com 
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> *Sent: *Thursday, September 1, 2022 4:06 PM
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> *Subject: *AT Digest, Vol 56, Issue 1
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>    1. Re: No A/C in Oklahoma in August!!! (Cecil Bearden)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 1 Sep 2022 06:12:46 -0500
> From: Cecil Bearden <crbearden at copper.net>
> To: at at lists.antique-tractor.com
> Subject: Re: [AT] No A/C in Oklahoma in August!!!
> Message-ID: <ec1c959e-1ec5-2dd6-a7c7-fb54bfc07324 at copper.net>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Since the experience and knowledge on this list is so varied I am
> posting this in case you guys can give me a little help.?? Monday
> evening we had one of OKlahoma's summer monsoons complete with 10K
> lightning strikes per hour.?? My Climatemaster Geothermal A/C system
> quit and I did not know it until Tues night as my house is super
> insulated.?? I have 3000ft of 2in pipe buried 6-8ft in 3 500ft trenches
> with 1ft of sand above and below the pipe.? I built this myself in 1985
> when I had more time and energy and broke.
>
> I have been trying to diagnose what has happened and really flying blind
> on it because there is so much computer crap on this one and it is
> already obsolete even though it was installed in 2010.? I also do not
> have thermometers or flow meters on the ground loop.? The thermometers
> died many years ago, and flow meters were terribly expensive when this
> system was installed. I had a tech from a Climatemaster dealer in
> Kingfisher come out and he looked at the system and really seemed to not
> understand what was going on., Kept telling me that I probably added too
> much Freon when it was low over 2 months ago, and kept telling me that I
> needed to remove the Freon and vacuum it down and add only a certain
> amount. But it was working fine before the storm. the circulating pump
> was very hot. I threw another circulating pump on it and added a couple
> of valves to make it easier to drain the system to replace the pump.
> Same problem. I took the new pump apart to make sure it was running and
> determined the check valve was reducing flow, the old one did not have a
> check valve. ? Removed the check valve and it ran longer before shutting
> down. Finally able to get some numbers of the old pump I found the old
> pump was a 5/16hp and the new one was 1/25. Also old pump was larger
> inside. This is a 3 ton unit operating at 70% capacity, so only 9
> gallon/minute max flow should be needed.? Not sure if there is a problem
> with the head on the pump or the flow. ? Another pump is ordered and
> hopefully will be here today.
>
>
> >
>
>
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