VR65/VR66 for HW flow temp control

I have an ecotec plus 438 boiler and I use the SL for both heating zones and DHW.

If I remember correctly, for ebus to fire the boiler you needed to leave the boiler terminals 3+4 bridged (I dont have it bridged and the boiler only fires on the SL).
 
I have an ecotec plus 438 boiler and I use the SL for both heating zones and DHW.

If I remember correctly, for ebus to fire the boiler you needed to leave the boiler terminals 3+4 bridged (I dont have it bridged and the boiler only fires on the SL).
Aha. Many thanks.
Based on how I have it wired now, The DHW fires up with the right hand CYL terminal of the VR65 terminal and No connection from the Nest to the Boiler Switched Live RT (3, 4)
 
I have now added a VRC470 in the Facia of Boiler ecoTec 630.
So the Setup is as others with
- Nest 3rd Gen Theormostats for Heating Circuits - Nests Control Heating Zone Valves and the Boiler Switched Live RT (Terminals 3,4)
- VR65 with Cyl Terminals (Grey, Orange)

Without the VRC470 in the Boiler Facia, all works well, however Once the VRC470 is installed in Boiler Facia, the control of Demostic Hot Water charging is LOST. The VR65 is receiving the DHW Demand voa the Cyl Termsinal (Grey, Orange DHW Zone Valves), but for some reason the Boiler is either not getting the DHW demand signal or the newly installed VRC470 is inhibiting the DHW Charging.

The VRC470 does indicate in the menu that:

System
- Domestic Hot Water - Charged

Also
Domestic Hot Water
- Cylinder - Active
- Cylinder temp target - 70 c
- Cyl Temp curent - 0 c Note: of course VR65 is using Cyl terminals only and not the Cyl Temp Sensor so would not know the actual temp

When I switch the DHW demand On or Off via one of the Nests, I no longer hear a relay switch in the VR65 when the VRC470 is fitted in Boiler facia.

Does anybdy have a similar setup ? what else should I look at ? any Menu or configuration settings on either the Boiler or VRC470 that needs adjusting ?

Again, It all works perfectly including DHW control (at the higher temp than Heating circuit) from the Nest if I remove the VRC470 from the Boiler Facia.

Many thanks
 
I have now added a VRC470 in the Facia of Boiler ecoTec 630.
So the Setup is as others with
- Nest 3rd Gen Theormostats for Heating Circuits - Nests Control Heating Zone Valves and the Boiler Switched Live RT (Terminals 3,4)
- VR65 with Cyl Terminals (Grey, Orange)

Without the VRC470 in the Boiler Facia, all works well, however Once the VRC470 is installed in Boiler Facia, the control of Demostic Hot Water charging is LOST. The VR65 is receiving the DHW Demand voa the Cyl Termsinal (Grey, Orange DHW Zone Valves), but for some reason the Boiler is either not getting the DHW demand signal or the newly installed VRC470 is inhibiting the DHW Charging.

The VRC470 does indicate in the menu that:

System
- Domestic Hot Water - Charged

Also
Domestic Hot Water
- Cylinder - Active
- Cylinder temp target - 70 c
- Cyl Temp curent - 0 c Note: of course VR65 is using Cyl terminals only and not the Cyl Temp Sensor so would not know the actual temp

When I switch the DHW demand On or Off via one of the Nests, I no longer hear a relay switch in the VR65 when the VRC470 is fitted in Boiler facia.

Does anybdy have a similar setup ? what else should I look at ? any Menu or configuration settings on either the Boiler or VRC470 that needs adjusting ?

Again, It all works perfectly including DHW control (at the higher temp than Heating circuit) from the Nest if I remove the VRC470 from the Boiler Facia.

Many thanks
Looks like I have solved it.
For anybody else experiancing this the solution was to Toggle the Settinings under Installer / System / Domestic Hot Water/ Cylinder - Active to Inactive to Active again, then it all works.

To be fair, having the VRC470 in the Facia as oposed to not having it, does not seem to have any benefit, as all the settings via the d. codes directly within the boiler / interface seem to still control all the temperatures (DHW, Heating etc), and the Nests control the rest.
 
Ok glad you solved it.

I was just going to post to check the CYL right hand terminal has 230V in the VR65/66 - that is what instructs the VR65/66 to enter DHW charging mode and boosts the flow temp to 80 degrees.

The advantage of the VRC470f (in my case) is the weather compensation with the outside temperature sensor. This allows the flow temps to be modulated, whilst still using the Nest's to control firing of the boiler and the VR65/66 to enter DHW mode.
 
Ok glad you solved it.

I was just going to post to check the CYL right hand terminal has 230V in the VR65/66 - that is what instructs the VR65/66 to enter DHW charging mode and boosts the flow temp to 80 degrees.

The advantage of the VRC470f (in my case) is the weather compensation with the outside temperature sensor. This allows the flow temps to be modulated, whilst still using the Nest's to control firing of the boiler and the VR65/66 to enter DHW mode.
Many thanks,
I’ve been operating the Weather Comp even without the VRC470, all you need is the outside Temp Sensor that wires into the Boiler edge connector and you can set the Heating Curve within the relevant boiler d. Code.

I had originally been hoping that the VRC470 may have been able to provide full control menus for the Boiler d. Codes and provide a full status summary of the boiler operation. I should have read the manual before picking it up of eBay. ;)


Really I can’t see any advantage of using the VRC470 in addition to weather comp that’s already inbuilt to the ecoTec boilers when you just wire on the outside temp sensor.
 
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