Last year, I had an open vent Vaillant 415 Eco tech plus boiler fitted by a Corgi fitter. I had, prior to fitting, upgraded the system electrics for my old boiler, using a Horstmann 425 mechanical programmer and Drayton Digistat RF1 room thermostat. An existing pair of five wire, 2-port, zone valves were retained for CH and DHW, The mechanical cylinder stat was also retained .
Now to my questions -:
At present, water temperature is set at the cylinder thermostat and the DHW control in the boiler is superfluous. Consequently, I intend to purchase a VR65 interface, and make use of the e-bus wiring which was installed for this reason when the boiler was fitted.
May first query is with regard to the VR10 Standard sensor supplied with the VR65. The manual (accessed on line) shows the installation of a NTC or VR10 to the UniStore but gives no information on fitting the supplied VR10 to a standard HW cylinder. In addition, I am confused about the terminology: Is the standard VR10, supplied with the VR65, also known as a NTC or is this a different device?
(The VR65 has separate connections for NTC and Cylinder Thermostat.)
Secondly, I do realise that the VR65 assumes that the 2-port valve for DHW is a spring return device, but rather than replace a perfectly good valve, I would use the VR65 to operate a suitable relay, which would provide the necessary supply to shut and open the valve. Obviously, if the valve became defective at a later date, I would replace it with a spring return type and remove the relay. What is your opinion on this?
I would appreciate your comments on both my proposals, or would it be better to fit a VRT 360f with the VR65 to the e-bus and remove the present, perfectly serviceable control system? The cost of the VRT 360f is quite high and I see no real advantage in using it, apart from more varied programming, to that provided by my present system.
The VR65 alone is much cheaper and, as I understand it, would allow water temperature to be set at the boiler.
Now to my questions -:
At present, water temperature is set at the cylinder thermostat and the DHW control in the boiler is superfluous. Consequently, I intend to purchase a VR65 interface, and make use of the e-bus wiring which was installed for this reason when the boiler was fitted.
May first query is with regard to the VR10 Standard sensor supplied with the VR65. The manual (accessed on line) shows the installation of a NTC or VR10 to the UniStore but gives no information on fitting the supplied VR10 to a standard HW cylinder. In addition, I am confused about the terminology: Is the standard VR10, supplied with the VR65, also known as a NTC or is this a different device?
(The VR65 has separate connections for NTC and Cylinder Thermostat.)
Secondly, I do realise that the VR65 assumes that the 2-port valve for DHW is a spring return device, but rather than replace a perfectly good valve, I would use the VR65 to operate a suitable relay, which would provide the necessary supply to shut and open the valve. Obviously, if the valve became defective at a later date, I would replace it with a spring return type and remove the relay. What is your opinion on this?
I would appreciate your comments on both my proposals, or would it be better to fit a VRT 360f with the VR65 to the e-bus and remove the present, perfectly serviceable control system? The cost of the VRT 360f is quite high and I see no real advantage in using it, apart from more varied programming, to that provided by my present system.
The VR65 alone is much cheaper and, as I understand it, would allow water temperature to be set at the boiler.
