thegreatone wrote:Am I correct in thinking that #4 from the timer goes to ZR?
Yes, assuming you are using a Will-burt timer. Note that you also need to install a jumper from #1 to #3.
thegreatone wrote:Also where does the neutral from the relay for zone 2 tie in on the triple aqua-stat?
It doesn't have to "tie in" to the triple at all, you can easily put a j-box ahead of the triple aquastat and route power/neutral from there to the additional zone relays.
Are you using a tankless coil in the boiler?