On 06/10/2019 13:00, ARW wrote:
The water to the header tank was turned off and the system drained down.

Swapped the mid position vale and it will now not fill back up.

The odd thing is the header tank did not drain off - it was still full
when I went to turn the water on.


Suggestions?

--

Adam


Hi Adam,

I'm confused! Which bit is gravity? If there's a mid-position valve, the
primary circuit is presumably fully pumped. It may be vented (as opposed
to pressurised) if there's a small fill and expansion tank - but that
doesn't make it "gravity". Is it thins tank which you're referring to as
the header tank, or do you mean the large cold water header for the
(presumably) gravity HW system?

Can you clarify just what you mean by "won't fill back up". Exactly what
is happening or not happening?

As someone else has pointed out, the 3-way valve will be in the HW-only
position when no power is applies to it. The manual lever moves it to
the mid position, when you should get some flow to both circuits. You
may need to do that if the primary circuit won't refill properly.
--
Cheers,
Roger
____________
Please reply to Newsgroup. Whilst email address is valid, it is seldom
checked.