Wiring a y-plan system for a worcester greenstar 28he without capacitor

[Nas]

Is there a way of wiring this boiler to a y-pan system so it does not require a capacitor on the switched live. I have wired it up but the heating will not switch off. After checking everything Im assuming it's because I've not got the capacitor in the circuit.

Thanks in advance

 

[mountainman]

You could use a relay or contactor to do the switching but a capacitor would be cheaper.

 

[stevetheplumber]

how old is this boiler not used a relay for years usually normal wiring for y plan
have you checked on honeywell website for a diagram

 

[Nas]

Its about 6 years old. Just been relocated.

 

[buckley plumb]

never had a problem like this

 

[Millsy 82]

I have never fitted a capacitor on these double check the wiring see what voltage you get on orange wire with everything off.

 

[mountainman]

The problem with Y plan is that you get a potential difference between orange and neutral when the valve is off.
This is sometimes sufficient to operate some boilers when it is connected to the SL.
Doesn't happen with S plan.

 

[Nas]

Turns out the boiler had the older version of the PCB. New pcb has resolved the issue