Power Ecobee with External 24V transformer, 4 wire system
This circuit is specifically for those who want to install an ecobee, but:
They have a 4-wire system (no C-Wire), and their furnace is hard to access for PEK install, and they can install a 24v transformer.
This will power the ecobee by the the 24v transformer, and it will switch relays which control the HVAC system.
Power Ecobee with External 24V transformer, 4 wire system
Project images are for reference only. Actual production is based on the manufacturing files on the project page.
Please review the designer's notes (e.g., PCB thickness) and select the appropriate options.
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for issues caused by unsuitable parameter selections.
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