Hi everyone, I am trying to install a new Honeywell Wi-Fi HoneywellModel # RTH6580WF. My old thermostat is a CTC 4350. When I pulled the cover to look at the wiring, my thermostat is only 3 wires. It is W, RH, G and a jumper from RH to RC. It does not have a yellow wire like most videos that I am seeing. I have propane heat and a central air conditioning unit. Supco 43503 CTC Programmable Thermostat with Auto Season Changeover, Supco 43503 - on sale at Test Equipment Depo. Download 8 Ctc union Thermostat PDF manuals. User manuals, Ctc union Thermostat Operating guides and Service manuals. I would post a pic of my thermostat showing the wiring but I am not sure how to do that here. Is there any way that I can use the new Honeywell. My thermostat has the following wire layout in this order: W RH RC G Y/Y1 O/B My wires are connected to W RH and G There is also jumper from RH to RC. Any help would really be appreciated. Thank you in advance. That is impossible or highly unlikely. Malare mounama mp3 song download. 30 yrs ago I did see someone do it with a DPST switch and somehow do it. The customer had to go downstairs and flip the switch from heat to cool to lock out the heat. I cannot remember how they wired it. Unless you have such a switch I cannot imagine what they did. However if you can post a pic of the circuit board of the furnace and the tstat wires maybe we can help. I have seen plenty of DIY hacker jobs and strange wiring but would have to be there to see what they did. I need to get to my 5 posts so I can put the photos. At the furnace 2 separate thermostat wires intersect. 1 from the thermostat and one from the A/C unit. They are wired into the furnace like this. From the thermostat, the white wire from the thermostat connects to the white wire of the the furnace. The red wire from the thermostat connects to the red wire of the furnace. The green wire from the thermostat connects to the green wire of the furnace. Now from the AC unit, the red and green wires are connected to the green wire of the furnace and the white wire is connected to the grey wire of the furnace. Hope this makes sense. That is impossible or highly unlikely. 30 yrs ago I did see someone do it with a DPST switch and somehow do it. The customer had to go downstairs and flip the switch from heat to cool to lock out the heat. I cannot remember how they wired it. Unless you have such a switch I cannot imagine what they did. However if you can post a pic of the circuit board of the furnace and the tstat wires maybe we can help. I have seen plenty of DIY hacker jobs and strange wiring but would have to be there to see what they did. The AC should be connected to the Y wire at the furnace board and the other AC wire at the C terminal of the board. Some units like elec furnaces or older Goodmans did not have terminals so the wires hang in the air but go to the transformer etc. G could turn the AC on if it is not connected to G on the board as it gets energized with Y. But if you turned the fan ON the AC would run 4 ever. I need pics and it sounds like you have to rip off the wires and hook them up properly and start over. Post the brand name and model # of the furnace. You also need a 5th wire for the wi-fi as you need a C at the tstat. Don't panic as this can be sorted thru. Or call a tech and see what the heck they did. Finally you need 5 wires at the tstat if you want to go wi-fi. 4 will do if you don't want to turn the fan ON manually. Read CTC Thermostats text version 'Climate Technology Corporation' A Hunter Fan Company & All CTC Thermostats Feature User Friendly Programs and Features Attractive Styling Blends well in any residential application. Loaded with features, designed for value! Overheat Protection Prevents lock-up in the heat mode by not allowing heat to come on if temperature is over 95 degrees. Static Protection Handles electrical spikes of up to 20,000 volts that could otherwise damage the system. CTC Thermostats are backed by over 100 years of experience. More than a century ago, John Hunter and his son James began manufacturing the ceiling fan. Since then, millions of Hunter home comfort products have been installed. Today, CTC is heir to that legacy, bringing products backed by those years of experience exclusively to HVAC contractors. Reliability Is The Keyword. In designing our thermostat line, reliability came first.
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