According several notes and forum publishings, it seams to be possible to change the Triac MAS97 with a N-MOSFET like AO3400.
According this informations I did created a little schematic based on the ones form OSPI v1.5.2 and Zone Extender 2.1 VDC.
There are still some questions about missing parts between those schematics.
Original 24VDC / Original 24VAC: (Based on attached PNG)
R1 = 1K / R1 = 330Ω
R2 = 2.2Ω/1W / R2 = Missing
R3 = 100KΩ / R3 = Missing
R4 = Missing / R4 = 47Ω
C1 = Missing / C1 = 0.01µ
Which one of this parts are required and what value should they have.
The 6VDC ports each will drive 1 small pump 6VDC, <= 600mA, 3.6W
https://www.aliexpress.com/item/1005001412789151.html
Thank you for your feedback.
Regards
Thomas