Customer wants to change an I-3 to Maxton valve on a TAC-20 controller, any help appreciated. Jumper settings?

Just change valve type M12 from a 1 to a 4 and be prepared to change valve coil relays K1-K8 more often than normal. It's not that big of a deal, not like you will be constantly replacing relays but the Maxton coils have a lower resistance and are a little tougher on those little tiny Schrack relay contacts.

Thanks. This will change to where it will use both coils for high speed?

Ya

I'm installing a ICON CONTROLLER with a maxton valve
and not sure if the US1 and US2 is the coil terminal
Any suggestions
Thanks

Yes it is, UP Slow

Maxton has a pretty good troubleshooting app for smartphones