I have installed two new boilers at home.
The company that did it left the wiring of the boilers to the controls
unfinished and certainly not as before. I am trying to make them do it
but don't know yet if it will take long.
I am trying to do it myself.
I have a typical, I would say, Honeywell S configuration. Five
motorized Honeywell valves, one for each four floors in the house for
central heating plus one for the hot water.
The valves are controlled by room thermostats and the one for the hot
water tank by a cylinder thermostat.
The thermostats are fed by a timer with five channels.
My problem is that I do not seem to find the switched life returning
from the valves so that I can connect the boilers to it.
I have read that the orange cables from the valves should be connected
to the boiler.
However, although in my case the orange cables are indeed connected
together to a common end point, there is never life there. Even when
some of the valves are open.
Where do I find the switched life coming from the central heating
valves when they are open (timer on and thermostat asking for heat)?
I would expect that switched life to be at the common terminal of the
orange cables. The switched life being supplied by the grey cable that
is connected to the orange when the valve is open.
In my case, though, the grey cables are not connected to life.
I have thought of connecting the grey cables to life with a piece of
cable, but I have noticed that there is a 234 V diferential between the
life and the grey cable, if I connect them there can be a short.