S Plan Unconventional Wiring

[wbjimmy1]

I’ve recently had my system boiler replaced and had my existing Y plan converted to an S plan ( I.e. 1x3 port valve replaced with 2x2 port valves).
Everything appears to work OK but I have now decided to replace my wired room thermostat with a wireless one ( I intend to retain my existing programmer) .As this requires connecting the stat receiver to the control box I decided to check the wiring and found it doesn’t match the Honeywell recommended wiring diagram.
The main difference appears to be that the valves are not connected by a live feed. Furthermore in an effort to reduce the number of cables entering the “wiring centre” ( which comprises a recessed back box with a birds nest collection of wago connectors) my plumber has combined the wiring of both the new 2 x port valves in a junction box to enable a single cable to enter the wiring centre.
I’ve attached a diagram showing the current wiring arrangement ( less the earth cables for clarity) . As I said the system appears to work OK but I would like reassurance that there isn’t a problem with it before a connect a wireless receiver. p.s. I’ve shown the colour of the wires but recognise these may be misleading.

 

[CountryFan]

If it works, then it should be fine for a wireless receiver. Colours don't mean much in a heating system.

 

[wbjimmy1]

Thanks. I agree but I don’t understand why all the on-line guidance shows a permanent live to the valves whilst in my setup they seem to rely on a switched live from the programmer/timer? Whilst it appears to work would there be any advantage in rewiring it (in the conventional way) before adding the wireless receiver?

 

[CountryFan]

I see what you mean now. Are you sure there’s no permanent live to the grey of the motorised valve?

 

[wbjimmy1]

The honest answer is I’m not sure. However if the grey wires are providing the live feed my wiring diagram suggests the valves are not being powered directly from the fused spur ( as recommended by Honeywell) but indirectly through either the programmer or the thermostat. If so Is there any disadvantage with this arrangement?

 

[CountryFan]

They don't have to come from the spur, just has to be a permanent live from the same source. Eg, LNE from spur to programmer LNE with a L going to greys. If it's only working on switched live then I doubt it would work