Evohome with Vaillant Boiler
Posted: Fri Mar 03, 2017 6:42 pm
My Honeywell Smartfit low voltage system controller has failed and I am considering replacing it with an Evohome system.
It is S Plan and both zone valves are to be changed for 240v units and will be controlled by BDR1 relays.
I have a Vaillant Ecoflex Plus system boiler. This boiler also includes the system pump which is controlled by the boiler controls.
My question is: how do I connect the zone valve controls to the boiler. At the moment the Smartfit box is connected to the boiler using a 4 wire (3 core + earth) cable which also supplies mains to the controls. The BLACK wire is connected from the SL connector in the Smartfit to terminal 4 on the boiler terminal block. (Vaillant unhelpfully just use numbers on the terminals)
None of the Evohome installation diagrams that I can find shows this configuration. Logically the ORANGE wires from the MVs should be connected to terminal 4 - is this correct? If not how does the demand get to the boiler or will I need a separate Evohome relay for the boiler?
It is S Plan and both zone valves are to be changed for 240v units and will be controlled by BDR1 relays.
I have a Vaillant Ecoflex Plus system boiler. This boiler also includes the system pump which is controlled by the boiler controls.
My question is: how do I connect the zone valve controls to the boiler. At the moment the Smartfit box is connected to the boiler using a 4 wire (3 core + earth) cable which also supplies mains to the controls. The BLACK wire is connected from the SL connector in the Smartfit to terminal 4 on the boiler terminal block. (Vaillant unhelpfully just use numbers on the terminals)
None of the Evohome installation diagrams that I can find shows this configuration. Logically the ORANGE wires from the MVs should be connected to terminal 4 - is this correct? If not how does the demand get to the boiler or will I need a separate Evohome relay for the boiler?