Y Plan Circuit Diagram. Greenstar ri 9kw to 24kw wiring diagram. This is known as a y plan system.
Wiring diagrams the following diagrams show you how to install the nest thermostat on. The valve moves to position b heating when power is applied. Wiring is essentially the same as a standard y plan with the room thermostat removed and the controller unit replacing the programmer.
The three port valve can look like a y shape when looking at the schematic layout of pipework as shown below.
Contains all the essential wiring diagrams across our range of heating controls. For full information about the c plan design and wiring you can download the installation instructions pdf from the honeywell uk website here. View and download hive active heating installation manual online. Electrical wiring for central heating systems.