Black Magic
Member
It seems that the M1XSP can't control the RCS Zone Controllers. It can only control thermostats. This increases complexity and cost as you have to buy one M1XSP and one TR16 or TR40 per zone and one non-controllable zone controller. If you need more than 4 zones, you can't use the RCS Zone Controller. I think the RobertShaw SlimZone (www.RetroZone.com) controller might work for more than four zones. I'll start a new thread on this.
