- 30 Oct 2020
- Reaction score
Give him £20 and he's post anywhere. Cash is king.
View attachment 245775
As a bonus a simple relay, a switch and an indicator lamp.
The lamp shows us that 240v DHW is active.
When 240v DHW is active and when switch is ON the relay breaks 240v live for heating demand from RT terminal and shutting all heating valves even if Nest thermostats are demanding heat.
When switch is OFF the relay does nothing, allowing Nests to steal overheated water during cylinder charging cycle for heating.
I'm wondering if my boiler pcb has that port to connect it to?>> Is your outside sensor a 693 that wired to the vr65 or to the ebus directly?
The sensor is wired to boiler PCB via edge connector VRC 252629
It is normally supplied with VRC 470.
VR65 knows nothing about whether compensation.
Sensor 693 also has DCF77 signal receiver from Frankfurt (German radio controlled clock in the boiler) as a bonus.
Also, 693 have a bit better chassis than the standard sensor.
Available from Amazon via Germany. Not normally sold in the UK since we are in a different time belt.
>> I'm wondering if my boiler pcb has that port to connect it to?
It doesn't have that port now. When you buy VRC 470 make sure it is supplied with edge connector and with 3 PIN connector for the boiler fascia.