Correct, the d0 is global.
For radiators heating mode we have one resgister to set the heating limit (same register is controlled by knob if you don't have weather compensation) and for DHW mode we have another register to set the limit. So, for radiator heating you can choose 40C and for DHW...
Bwel, -- he was saying that one of two CYL terminals has permanent 240v in it, so it can be ignored during the wiring. The other therminal can be connected directly to switched 240v. This is just like you do with RT terminal in your boiler. Once you have 240v on that second terminal the VR65...
Bwel, -- VR65 can only put boiler into DHW heating mode via eBus command by receiving 240v from the outside. In that mode there's a separate register (forgot the exact number) that limits temperature during DHW heating cycle. I personally configured it for 80C. In DHW mode boiler can't go any...
Why not? Try it. Calculate all heat demand situations and see if it works for you.
The Valliant native thermostat will request heat via eBus command. Once that happens, VR65/VR66 will open valve for you.
Better late than never. Wiring is extremely simple. When the replay is off that means that Nests are allowed to steal heated water when DWH heating cycle is active. It does not mean that hot water circuit is always off.
>> Having it (control box) mounted to the front of the boiler sounds good.
Yes. That will automatically de-active the build-in Vaillant thermostat that you don't need.
>> Whilst wiring up the sensor takes longer, just feels more likely to last longer.
Yes, that's forever. Also, no worries about losing wireless signal. Make sure you have access to shady northern-facing wall.
I guarantee you that your boiler comes with no VRC 252629 edge connector fitted.
If you source VRC470 in a sealed new box it will have that connector and a 3 pin connector for in-fascia installation in it.
If you source just a bare used VRC470 you'll just google for VRC 252629 and get it.
Same...
>> 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.
Here's how you do that:
If you choose wired path.
There is wireless VRC 470f...
>> You have clearly done your homework on all of this
Download manuals and just read them. That's all I have done.
Now enjoy heating the way it should've been done from day 1.
Save some money too.
>> 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
Edge connector is normally supplied with VRC 470.
VR65 knows nothing about whether compensation.
Sensor 693 is a basic thermistor sensor.
Sensor on...
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, shutting all heating valves that results in immediate removal of 240v from RT terminal of the...
>> Vaillant tech support told me my 2011 ecotec plus wouldn't work with VR66.
There's a switch on VR66 that makes it VR65 for compatibility
Buy yourself VR65 for £5 from Facebook (link above) and done.