Hi, I'm Brian and I'm here to help. On a Trane unit the 24vac common connection in the unit is terminal "B" this would go to terminal C on the thermostat. Heat pumps can be difficult to wire so Is there any other question about the thermostat wiring that I can help you with?
Hi, Thanks for the information and the .pdf. I put the Blue on C and all of the other wires to their corresponding terminals, Red, Yellow, and Green.
However I am unclear where the White wire will go. The Terminal block has two sets of labels, Conventional and Heat Pump. I have a Heat Pump. There is no terminal label for W on the Heat Pump side. Looking at the .pdf., it shows the White wire moving from W to X2. I have no label for X2. I have O/B E/Aux, L and K. Any ideas?
I don't have an O wire. I have Red, White, Blue, Yellow, and Green. I will put the White on E/Aux.
I did not hook up the Orange wire because I do not have one. I powered up the init on Cool and I got Heat from the air duct.
it is aN RTH8580WF1007
On the roof top unit (RTU)I have the following connections:
RTU /Wire # XXXXX Thermostat Wire /Thermostat Terminal
Orange/ 40a/ Blue/ C
I made all of the changes and matched all of the wire numbers, but I still get heat only, no cooling at all. I'm going back to the old thermostat. It' over a 100 degrees in here now.
Yes I have the back up heat for this system and I set all of the parameters as you say. Nothing but heat. I think it blew out something in my unit though because I went back to the old wiring and the old thermostat and now nothing but heat. I took pictured of the original wiring and made notes, so I am sure of the proper termination. I hope I didn't blow up the controller
Yes but not here. I just found out I get heat in the Cool position and cool in the Heat position. So I got something wired wrong despite my precautions. I'm thinking since the AC Orange wire goes to the Blue thermostat wire the Blue Thermostat wire should go to the O terminal on the thermostat.
ok, thanks. I moved the blue wire over to the O terminal and all seems to be back to normal. I could really use a recommendation for a WiFi enabled thermostat for thie Trane WHC042C100AA unit. If there is an easier one to hook up and use I would go that route.
Thanks for your help.
Thank you. I was starting to look at the Ecobee and the Nest, but I haven't checked out the wiring requirements yet.
On your advice from yesterday, I took the inoperative Honeywell back and got another of the same model. I have all of the wires hooked up as you suggested previously, but I still have heat only and no cool in any selected mode.
I set 0170 to 7, but I don't have a menu selection of 180. I do have a 0190 which is set to 0 as I have the O (40a) wire hooked to O/B and the B (36a) wire to C.
I have a total of 8 wires in my bundle, so no need to run any more. I have all six wires you listed hooked up as outlined, but so far only heat.
Success! I found where the wire bundle had been spliced. The three spares were never joined. I made the connections, rewired the Unit to conform to the correct color codes, but left the white and the yellow wires tied to the yellow at the unit. It seemed to require that even with the original thermostat. Everything seems to work. At least is produces both heat and cool in the correct switch positions.
I do have a couple of quirks I'll need to work out with Honeywell such as I cannot turn on the fan remotely, but I can switch from Fan On to Auto remotely. But it is connected tot he internet and I can adjust schedules, temps, and On/Off. So that is really enough for the moment.