Can someone please, please explain what this does.
Since I turned my heating on last month, I either get hot water or heating
(unless I run them both all day)
During the summer I had the water on for 90 mins at each end of the day
which was fine. Then after I turned the heating on, the water was colder
than normal which I assumed was because the coil in the tank was taking away
the heat (thats as far as I understand it)
The system has a Honeywell V4073A 1039 zone valve fitted, with a little
lever at the bottom. It can be locked in MAN OPEN, or pushed across to AUTO.
If I dont lock it in MAN OPEN it floats back in the middle of both.
Could you explain what the valve does, and what I should set it to....
The Honeywell V4073A1039 is 3 port mid position diverter
valve has been designed to control the flow of water in
small bore domestic central heating systems, where both
radiator and hot water cylinder circuits are pumped. There
should be three pipes going to it.
"Floating in the middle" (AUTO) is where it normally should
be - supplying heated water to both primary circuits (the
rads and the cylinder coil). When you give priority to hot
water or heating the valve will divert more water to the
appropriate outlet. The MAN Open position is where you put
it when draining down the system, so both primary circuits
can be drained at once.
I suspect that your pump is not running. Have you checked
that? It may just need freeing up - if it has an end cap
that you can remove and there is a big screwdriver slot
inside, you may be able to get it to turn. Once freed up, it
will probably be fine for a while, months even - bu you need
to think about getting it replaced. It should have isolator
valves fitted either side of it, so the pump can be removed
without draining down and replaced.
If you leave it on all day, enough heat may be transferred
by convection (hot water just rising in the pipes up to the
coil and rads and cold water falling back down to the
boiler. But nowhere like the flow you get from a pump.
If it is working correctly then you should not need to touch the valve.
Try turning the water on for a little longer or turning the tank stat up a
bit (60 deg is about normal). Do not forget that the water entering your
house is quite a bit colder than it was in the summer months.
Have a look at
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