I am a welder not an electrician. I don't trust any wire nut I have ever used. I'll do a pull test and half the time they fail.
I switched to WAGO about 10 years ago. Using them on trailers (RV and equipment) for both DC and AC loads. None ever failed my pull test. None to my knowledge have vibrated open.
I trust them the most when connecting solid wire and stranded wire.
I say use what you feel you can install correctly.
WAGO are not UL listed they do have many European certifications.
All just my opinion and experience.
FYI true WAGO brand lever locks are UL listed. That is the one warning with buying them is to buy them from reputable source, lots of knock offs out there, don't think I would buy them off amazon unless it was from a reliable seller that I knew. I am also not sure that they are UL listed for use in mobile applications, but WAGO says they are suitable for mobile applications. They recommend not using them on high use high amperage connections. I would use the insulated terminal blocks that Richard likes, name of them escapes me, we call them Polaris lugs. I used the polaris lugs on my A/C units.
Oh and wire nuts are not approved at all for mobile applications. Typically they use crimp on connectors for the AC wiring in RV's for making wire connections.
I was able to find (another) HVAC contractor that actually showed up this morning and got my SCS A/C system working correctly using 24-volt contactors/relays! He was able to get both compressors working and ended up wiring it so that the inside fan runs on high all the time (works for me - unless someone knows how to connect up that part. Early this morning, before the HVAC guy (Jovani) arrived I went to Homey Despot and traded in the Ecobee Essential thermostat to HD for another Ecobee Enhanced because it includes the dongle that adds a ‘C’ (common) 24-volt wire connection. Jovani said I don’t need the C wire since there is a common on the relay (or maybe it’s on the transformer, can’t remember)… Do any of you guys think I need to keep the adapter for the C wire or should I get my $100 back? TIA Can’t wait to get this unit back in the coach! The Ecobee Tstat works great but I still need to figure out how to connect it up from the A/C unit to the thermostat to the Aquahot unit (24-volt)…
(07-26-2025, 06:34 AM)pairodice Wrote: I was able to find (another) HVAC contractor that actually showed up this morning and got my SCS A/C system working correctly using 24-volt contactors/relays! He was able to get both compressors working and ended up wiring it so that the inside fan runs on high all the time (works for me - unless someone knows how to connect up that part. Early this morning, before the HVAC guy (Jovani) arrived I went to Homey Despot and traded in the Ecobee Essential thermostat to HD for another Ecobee Enhanced because it includes the dongle that adds a ‘C’ (common) 24-volt wire connection. Jovani said I don’t need the C wire since there is a common on the relay (or maybe it’s on the transformer, can’t remember)… Do any of you guys think I need to keep the adapter for the C wire or should I get my $100 back? TIA Can’t wait to get this unit back in the coach! The Ecobee Tstat works great but I still need to figure out how to connect it up from the A/C unit to the thermostat to the Aquahot unit (24-volt)…
Adrian, glad you are getting it done. If you need any more assistance I will do what I can to help out. Sounds like you are getting very close to having two operating units with updated thermostats.
It is not hard to get the fan working on 2 speeds, all you need is a normally closed and open 24 volt relay with the contacts rated at 2 to 3 times the fla of the fan motor, put the wire that is giving the fan power now on the common terminal I would put the high fan motor wire on the normally open contact put the low fan wire on the normally closed contact. put the 24 volt common on 1 side of the coil put a wire from power side of the 2nd compressor to the other side of the coil, that will switch it to high fan when the 2nd compressor turns on
I have my wiring diagram drawn up on how I wired the two speed for the outside fan. I did not bother with the two speed for the inside fan. I thought that I could put a switch to change the speed of the indoor fan but I noticed that its not that much difference in high and low so i just put it on high.
Here is may diagram, its a little more complicated because I used 120v coil relays for the compressors so that added some extra relays that are not necessary if you are buying all 24v coil relays, I believe that Adrian used the 24v coil relays to simplify things:
Video showing the wiring mess - I will be building a series and will get rid of the extra videos https://youtu.be/DFEU4U8Ryok
Special thanks to Jeff for helping me through the wiring and sending his diagram! I had a hard time reading it but my ac guy could read it just fine! Should get the units back to the coach tomorrow and hopefully have them installed and running soon!
Another day in the saga of the Coach AC units… with the help of my NEW ac guy I have BOTH compressors running with the fan on HIGH speed (which is ok for now). I have been working today to get the wiring for the thermostat figured out and have it mostly together and have checked all the wiring by using my multimeter on continuity mode with a LONG wire between the A/C unit and the t-stat… that all checked out fine and I ended up with 5 wires… After going back through Chester’s and Jeff’s notes I see now what those extra (maybe) 14 guage wires are for - the Aquahot… I’m not interested in heat yet but will be soon…
