Drayton Motorised Zone Valves Training and Q&A 

Hi, I seem to have an older 3 port valve on my Worcester boiler. It has a coarser thread. Any idea what size that would be? Not 22mm clearly.

If we manually move the nob will over the copper connector will it change the flow of water from room heating to water heating ?

Hi James, great presentation. I was looking to use a mid position valve on a system that Iam going to modify and wondered your thoughts. The current system is a S plan plus and is controled with two 3rd gen nest smart stats. I would like to change this to a X plan (PDHW) with opentherm and weather comp . In order to do this I would fit a mid position valve upstream of the n/o htg valve and have the n/o port on the mid position to the down stairs circuit and the motored to either both or upstairs only. I think that this would work hydraulically, however I a struggling a bit with the wiring, especially how I can switch the opentherm (low voltage) from the different htg circuits . Volt free switching can be obtained from the nest heat links. Any help would be appreciated. Thanks Jimmy. (VHPltd).