I would like to allow/prohibit zone1 and/or zone2 depending on outdoor temperature. I have a 2 zone setup with mixing tank and if zone2 mixing valve is closed (during summer time) and heating in allowed mode then zone1 does not work how I want. But if I prohibit zone2 then zone1 always keep flowing even if outdoor unit is not heating. I need zone2 to come on when outdoor temp decrease to around 10C when there would be actual call for heat. I run heat curve on both zones but I can't do anything with only adjusting heat curve. I need to prohibit Z2 until 10C OAT. Now I do it manually because time scheduled allowance does not work for me.