I've traced the wiring and it's he

http://homepage.ntlworld.com/richard...RY/boiler.html

I want to know, is this circuit a correct one? Are there any errors in it?

I don't understand the thing with the two black wires from the boiler.
I've disconnected, and never made a note of which black wire went where.
I thought it did not matter. since both are black.

Boiler is VOKERA "Pinnacle 16".
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Vokera "Pinnacle 16" Schematic

If I have not made a mistake, this is how my VOKERA "Pinnacle 16" was
wired up.

In the Installation and Service Instructions, an example of the "S Plan
System" is given. It is not like this schematic.

In the Service Instructions, the two switches inside the motorised
actuators (Danfoss HPA2) are wired in parallel, but both wires (orange -
grey) just go into the boiler (to M7, pins 2 & 3).

The boiler has 5 wires going into it, 3 for mains (L N E) and two wires
- both coloured black.

Here you see that the two switches inside the actuators are both in
parallel, but live at one end, and the other (orange wires) goes to a
black wire into the bolier.

On this schematic, tracing the other black wire from the boiler, it goes
onto pins 2 & 5, of the Danfoss SET 3A timer. Pin 1 (Water ON) goes to
the cylinder (water) stat, then through the water actuator motor, then
to Neutral. Pin 4(Heater ON) goes through the Room Stat, then through
the heater actuator motor, then to Neutral.

There is no link connecting the Live wire, in the timer, to any of the
pins numbered 1 to 6. Presumably the Live potential is coming from the
boiler -out of the black wire.

Is the schematic I've drawn out correct?

What I don't understand is these black wires. There is no way to tell
which black wire should be connected to what. I believe you must
connect the right black wire to the switches or the thermostat.

Because of the problem with the black wires coming from the boiler, I
don't understand this circuit. I don't know what the black wires go to
in the boiler or what they supply. Anybody know?