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So #490 has a list, as all things seem to. The couple of high priority items are tires, steering issues and air conditioning issues, then aqua hot/water heater issues.

So I pulled one of the basement airs out, it’s an SCS dual stage package unit. Found out they are sealed systems with no service ports and you have to pull the entire unit out to service it. Not very service friendly. Pulling the unit was not too difficult, luckily they they are located in a bay and are fairly easy to get to. So I found a burned up control board, and after some research I decided I am going to ditch the entire board and re-wire everything with some relays and a 24vac transformer so I can use a house style thermostat with Wi-Fi capability.

New shoes delivered:

Burned up board

Disconnecting the duct work to get the unit out:

New relays and transformer installed:

Unit almost ready to go back in, notice I made some cut outs in the top to get to the new service ports that are going to be added:

Jeff,
I know this is an old post was wondering how is the SCS relay mod that you did to your units working out?  Thanks

Thanks for bumping me Steve. I have been quite busy trying to get things done. 

So the relay mod has been working flawlessly. I have only made one slight modification to the system and that was to use power from the inverter circuit to supply power to 24v transformer for the thermostats. This makes sure that the thermostats always have power. I actually just placed the 24v transformer right next to the inverter panel and fed it off an existing circuit. I also added SPP6 capacitors to each compressor unit, to hopefully extend the life of the compressors and also put a little less starting load on the generator. These capacitors are what they call hard start capacitors, they give the compressor a little boost to start, without getting too technical. 

The only real hiccup I had was that I put the piercing valves on and did not get around to changing the piercing valves out. I was going to wait till winter time to do this but unfortunately one of them started leaking so it prompted me to go ahead and pull the units back out and put in permanent service ports. So that has all been completed finally. It took a while for me to get all the parts and prices needed for the project and I had an idea to do it without soldering and that just did not work out. Spent more time trying to avoid soldering than it did to actually just go ahead and solder in the new fittings. During all this my dash air also went out, so I was messing around with that trying to figure out what was wrong with it. Guess I probably need to start a new thread about the dash air debacle.