so i went to replace one of my heat sequencers on my electric furnace. was trying to be careful taking them off and hooking back up in the correct spots, but when i went to take the brown wire off of my M2 spade it fell outta my hand and when i picked it up i noticed the other end of the brown wire was detached. i had no idea where it came from, so i did a dumb thing and guessed where it came from and attached it to a spade on the other heat sequencer. when i went to turn my furnace on i had way more air coming outta my vents than normal and then after about 30 seconds i heard a pop and my thermostat was blank and black inside. my furnace was still putting out warm air so i shut the breaker off to it. i need to pick up a new thermostat now but can anyone tell me where the other end of my brown wire thats hooked on to the M2 spade needs to go? thanks
sheffr
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I'm not an electrician by any means but it looks like you have 2 sequencers K32 and K33 on your diagram. It also looks like M2 from K32 sequencer should connect to the other sequencer K33 M2. So if I read this correctly it's M2 to M2 from one sequencer to the other. Do you have an M2 terminal on both sequencers?
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My Coleman furnace has a much better and easier diagram complete with color coding but your diagram isn't for a novice to figure out. I tried but couldn't find any videos or photos of your furnace to try and get a look at the sequencer wiring. I do know that the coils in the sequencers are activated by a 24v transformer that is turned on by the thermostat, this energizes the coils in the sequencers which start closing their contacts in delayed intervals. Usually the blower and the first element are on the first contacts of the first sequencer and then the other elements come on in staged intervals until they are all working. This is so the furnace doesn't have a huge spike in energy demand all at once and blow the fuses or breakers. I wish I could be more help but I'm afraid that you have already done some damage to your thermostat for one and maybe more.
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I really don't feel comfortable giving advice on this because I'm not an electrician or HVAC technician and I'm not there looking at your unit and verifying what I think I'm seeing in the wiring diagram. I just did sequencers and high temp limits in my furnace and fixed an issue with one of my heating elements cycling on and off. My furnace is quite different than yours and is more simple with a very clear, easy to read wiring diagram with all the wire colors.
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