Tim Tears It Apart: Honeywell R8184 Oil-fired boiler controller - Right here is the underside displaying the pcb. This need to provide some sense as to the age of this design. Those curvacious lines are something you just don’t see in the generation of pc-aided pcb layout. This board can also thoroughly were laid out literally by way of hand, the master hint pattern drawn in magic marker. Speakme of which, i drew an arrow in marker pointing to the probably wrongdoer for this unit’s failure: a cold solder joint on one of the relay terminals, specially, the one that energizes the orange cord leading to the burner and motor. You could additionally see a few strategic cuts within the board itself, offering a physical air hole to isolate the low-voltage stuff from the road-powered sections close by.
The fat transformer at pinnacle-left steps the 120vac from the line down to round 24vac to drive its very own circuitry and the thermostat (pink and white wire normally connected to the “t” terminals). I peeled again the tape at the primary winding a piece so that you can see the distinction in cord diameter, taking into account many extra turns on the primary side. Without documentation or right test equipment, you may use this to visually determine its function as a step-down transformer and perhaps even make a unfastened guesstimate of the turns ratio.
?however tiiiim! That sounds booooorrrring. Why this thing, and no longer one of these fancy cloud-enabled thermostats containing more ram than the computing device laptop you had in university and no longer less than 5 processors able to walking angry birds at a playable framerate???.
Right here is the topside. There’s simply not anything a good deal to it! You could probably take a stab at how this all works simply through inspection, however in case no longer, honeywell gives the real schematic on their internet site.
Yes, pleasure-clever this one sounds right up there with having your toenails waxed, but there are some thrilling bits regardless. Also, i have a broken one sitting in my basement right now, and what will we do with damaged devices???.