wiring diagram for carrier gas furnace 58STA/STX
I am brand new to this site and not sure exactly where to post my question. This would be the proper forum: http://www.doityourself.com/forum/gas-oil-home-heating-furnaces-26/ Furd you beat me to it. Now that we are in the correct forum, just what is the question? Be specific. I am trying to change out my thermostat. The one I bought at Home Depot is a Honeywell programmable model. The instructions don't allow for my situation. I have a total of 8 low-voltage wires attached to my old thermostat. The tech person, from Mombai I am thinking, says I need to look at the wiring on the FURNACE wiring control board. In removing the furnace cover I don't find a board per se. I do see the wiring harness, bundled together, with wires going to very specific connection locations in many areas. There are even more than 8 wires! So, am perplexed as to just what to do next. Find the thermostat cable going in. It is those eight wired you need to trace out. What model number Honeywell? What are the connection labels on the old thermostat (usually letters such as R). What are the connection labels you are missing on the new thermostat? Not an HVAC guy but answers to these questions should help them help you. Page 13 http://www.docs.hvacpartners.com/idc/groups/public/documents/techlit/58st-5pd.pdf You only need five conductors between the furnace and the thermostat. R, C, W, G and Y On the thermostat there may be both an R and RC (or Rc) This is the power from the furnace control transformer. If you have both R and RC then there should be a jumper wire connecting the two. Thermostat connections R= Red wire, power from furnace control transformer for heat function. RC= power from furnace control transformer for cooling function. C= power return to furnace control transformer for thermostat operation. Could be either blue, black or another color different from the other terminals. W= White wire, power from thermostat to heat function of furnace. G= Green wire, power from thermostat to manual blower operation of furnace. Y= Yellow wire, power from thermostat to furnace for cooling function. The thermostat may have additional terminals such as W2, Y2, O and B. These are for multi-stage heating and cooling and heat pump systems. We need to know what terminals the wires went to on the old thermostat...........
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