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scott ketterman · Oct 31, 2006, 05:57 AM

I have an older Carrier gas furnace. The Intermittent Pilot Ignition Control is short cycling. I ordered a replacement one. However, with everything else now days, the newer one does not match the older one. The older one (p/n 50D49-401) has three brown wires, one red wire, one white wire, one yellow wire, and two blue wires. The new replacement Control (p/n G775 RGA-2) Has the following terminals: #1-P.V. #2-THS, #3-M.V. #4-SENSE, #5-Ground. Does anybody know which wire/wires goes on which terminal? I’ve tried to locate a wiring diagram with no luck. Any help would be appreciated. Thanks.

labman · Oct 31, 2006, 06:37 AM

If you are lucky, some of the more experienced people here can tell you what each wire does or at least direct you to a diagram.

While you are waiting, does your furnace have a wiring diagram showing what each does of what I count as 8 wires? Do a number of them connect back to the common side of the transformer? I have had good luck putting part numbers into a search engine and finding information I needed. Might even try separating the 2 part numbers with a +.

NorthernHeat · Oct 31, 2006, 03:18 PM

I don't know the colors of wires of the top of my head but hear it goes. On the gas valve it should have pv (pilot valve) mv (main valve) and pv/mv common or ground. Sense goes to the little metal rod that sits in front of the pilot. Now it gets a bit tricky. Does the ignitor sense flame or what's called a remote flame sensor. You just have to know what pilot assembly you are looking at to answer, in short, 1 or two wires going to the pilot assembly. THS is the 24 volts from the thermostat to power module to start. Ground can be any chassis ground or mv/pv which should also go to ground. Don't mess up pv and mv it could be quite a hair raising experience.