Nowhere obvious you can borrow a permanent live from, so the 300 rf wouldn't work.
The 500 rf programmable one would though.
You could do what you suggested earlier doitall and make terminal 5 perm live by rearranging the wiring in the programmer
That or setting the ch to constant on
Matt
Wouldn't work with the 300rf stat as gaswizzard said
Ah gotchca the 300 isn't programmable!