Y Plan Wiring Diagram No Room Stat. **standard dial thermostats may be power from a time clock. If you have a gravity fed or a y plan system 3port valve with no hot water off wire the green status light should be altered to be blue.
Heating does not switch on when hot water switched off? Disconnect all 3 red, yellow and blue plus the cpc (earth) in the wiring centre and connect the white from the valve to the ch on. I just wanted to check i hadn't missed something obscure.
Mid position valve opens hot water b by default;
Mid position valve opens hot water b by default; Gravity system y plan with no hot water off wire. This is the diagram for the new stat (using diagram on left for rx1);. I am planning on using the honeywell wiring centre to make things a bit easier, but unlike a standard boiler, i really can’t see how to wire this boiler up.
And you should select the most appropriate diagram that matches the components you have installed in your system along with what you’re hoping to achieve in terms of controllability.
I can't have the ch on without the hw being on.
The diagram can be used as a boiler with a pump overrun as well, you just take the pump live / neutral / earth from the wiring center and run it to the boiler terminals.
Wiring is essentially the same as a standard y plan, with the room thermostat removed and the controller unit replacing the programmer.
If using y plan ensure hw off and cyl stat terminal 2 are connected.
Not sure the room stat (or perhaps ch output on programmer is working either.
Room stat on and cylinder stat off.
Electrical wiring for central heating systems.
Follow the simple process above, selecting your heat source, cylinder choice (if applicable) and your thermostat code to view the relevant wiring diagrams for the system.