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post #1 of 12 (permalink) Old 06-17-2019, 08:35 PM Thread Starter
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Default New AC

Not woodworking, but a major factor in my woodworking! Too hot, no workee for me.

Pretty happy this evening. I just replaced the mini split AC in the garage. And this afternoon, I managed to capture the codes and get the Home Assistant "generic thermostat" working. This is my home automation program I have been tinkering with for about a year. I guess you can see by the graph, it has only been working for a couple of hours.

While it only has one button for On/Off, I finally realized there are two codes...one for on and one for off. And I have been tweaking the settings for the thermostat. I have it set for .5 cold tolerance so it should try to maintain a 1/2 deg swing. I think that is good enough for a wood shop.

Edit: I forgot about the sensor. I still need to attach it so I will know if the louver is open or closed.
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post #2 of 12 (permalink) Old 06-17-2019, 09:21 PM
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Did your old unit go out, Mike? The thermostat on our unit has about a 4 swing, not very accurate at all. But the unit itself works great.

Yes, I believe 0.5 is close enough for a wood shop!

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post #3 of 12 (permalink) Old 06-17-2019, 09:48 PM Thread Starter
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Yes. The evaporator coil had small leak. No way to fix it without replacing the inside unit. And I can't find Fedders parts for it. So we sat it out by the curb and it was going in less than ten minutes!

This model is the Mr Cool DIY model. Easy to install. No AC experience needed. The line set comes precharged and attached to the inside unit, so simply attach it to the condenser and open the valves! I already had the electrical, so that part was easy. However, the lineset is 25 feet and my old one was at least 30 so I had to build a new pad for it.

The hole through the wall was smaller than needed so I had to buy a 3 1/2 inch hole saw. I made a guide out of some mdf to guide the cutting teeth of the larger saw unti it had cut a groove. Then all went smooth.
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post #4 of 12 (permalink) Old 06-17-2019, 09:51 PM Thread Starter
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New deck for the condenser pad.
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post #5 of 12 (permalink) Old 06-17-2019, 09:54 PM
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I doubt I would survive a Texas Summer without AC........

Great that you are able to do it DIY.....

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post #6 of 12 (permalink) Old 06-18-2019, 12:56 AM
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Good!! Now maybe you can back to the CNC. It misses you. Don't want it to freeze up do you?? lol

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post #7 of 12 (permalink) Old 06-18-2019, 07:37 AM
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Looks like a pro job. Those precharged and vacuum sealed units can be real easy to install but pricey. But they fit a real need and if you can install yourself it saves a ton. Coils are usually the weakest point and then the "U" turns in the coils where the most friction is. Nothing you can do about it but usually they last 15 or so years. At least if they're sized properly and run under normal conditions. If you're in a normally hot and long season, not as long. Keeping the filters and coils clean is key to efficiency.

Probably can't do it but using a pleated filter keeps the evaporator coil pristine. When we built our house and installed our zone system (what I did for a living) I installed a 5" pleated filter in the return plenum. Usually the filter was good for 6-9 months and 17 years later when I replaced the system the "A" coil looked like brand new and the condensate pan was clean enough to drink from.

Ya done good Mike.
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post #8 of 12 (permalink) Old 06-18-2019, 07:47 AM
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I think regulating to 0.5 degree is a bit tight, I would be happy with 1 degree.

Those DIY units look cool, but I would need a longer run. When we put the addition on our house we tied it into the existing AC, but it has turned out far from perfect. If we decide to stay in this house much longer I will probably have to go the MiniSplit route for that space.

Plus, having a 2nd AC does come in handy when you lose the main AC unit.... and that isn't second hand information....
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post #9 of 12 (permalink) Old 06-18-2019, 10:36 AM
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Quote:
Originally Posted by kp91 View Post
Plus, having a 2nd AC does come in handy when you lose the main AC unit.... and that isn't second hand information....
We lost the main unit in July a few years ago when the fan motor went out one Saturday afternoon (ALWAYS on a weekend, right!?! ). Our shop is the attached two-car garage and is closest to our bedroom so I cranked the mini-split unit down to about 65 knowing it would never reach that and then set up a series of four fans to direct the air through the kitchen and into our bedroom. It wasn't great but it definitely helped.

At the time we had an 18-year old daughter and 28-year old son living with us on the other side of the house. They walked over to our side and asked, 'What about us?' I just smiled and suggested they use their imagination and pretend it's cold in their rooms and to stay out of the 'cold' air path to our room.

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post #10 of 12 (permalink) Old 06-18-2019, 12:07 PM Thread Starter
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Quote:
Originally Posted by kp91 View Post
I think regulating to 0.5 degree is a bit tight, I would be happy with 1 degree.


Plus, having a 2nd AC does come in handy when you lose the main AC unit.... and that isn't second hand information....
I agree. One degree won't hurt a thing. Looks like it is doing a good job of controlling the temperature. The sensor is on my workbench...about 12 feet away so I get a good reading of what the temp is. I plan to tinker with the thermostat settings a little more and maybe the starts/stops will be less frequent.
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