I've spoken with tech support and my local Intergas expert. Neither were 100% sure whether you could do the PDHW X-Plan with two zones. Tech support found a diagram which they thought might do it but it was marked strictly for internal use only.
I understand the general idea where the boiler sends a signal to the HW zone valve which then sends a signal to close the NO CH valve. What I can't see on the wiring diagram is what would control the two other valves which operate the two heating zones.
I understand the general idea where the boiler sends a signal to the HW zone valve which then sends a signal to close the NO CH valve. What I can't see on the wiring diagram is what would control the two other valves which operate the two heating zones.