Use isolated mode. Power the Sonoff with a small wall-wart style transformer that outputs 5 to 12 volts DC.
The small transformer will take your 220 VAC and convert it to low voltage DC. Input this DC power making sure to observe the (+)(-) polarity at the pins provided on the circuit board.
With the resistors removed you then input the 24 VAC at the input terminals and it will be switched at the output.
Use isolated mode. Power the Sonoff with a small wall-wart style transformer that outputs 5 to 12 volts DC.
The small transformer will take your 220 VAC and convert it to low voltage DC. Input this DC power making sure to observe the (+)(-) polarity at the pins provided on the circuit board.
With the resistors removed you then input the 24 VAC at the input terminals and it will be switched at the output.
Use isolated mode. Power the Sonoff with a small wall-wart style transformer that outputs 5 to 24 volts DC.
The small transformer will take your 220 VAC and convert it to low voltage DC. Input this DC power making sure to observe the (+)(-) polarity at the pins provided on the circuit board.
With the resistors removed you then input the 24 VAC at the input terminals and it will be switched at the output.
You could also do the same as above in isolated mode but use a 24 VAC to 12 VDC converter instead of the wall wart transformer to power the Sonoff. Available on eBay for around $10.00. If you choose to do it that way everything could be powered from the 24 VAC supply.
Luis Ribeiro