On Mon, 12 Apr 2004 00:21:52 GMT, (Matthew Humphreys)
wrote:

On Sun, 11 Apr 2004 17:00:03 GMT, (Lurch)
wrote:

On Sun, 11 Apr 2004 15:56:17 GMT, in uk.d-i-y
(Matthew Humphreys) strung together this:

Check the wiring in your junction box. When hot water only is switched on,
pins 1 and 6 in the junction box should be live. When you turn the cylinder
stat up to a high temperature, pin 8 should be live (and pin 7 not live).
When you turn the cylstat down to a low temperature, pin 8 should cease to
be live and pin 7 should become live instead.

The boiler and pump (or just the boiler if the pump is connected via an
over-run stat on the boiler) should be connected to pin 8 - so the boiler
should fire when the cylstat is turned up.

Check these things, and let us know the score.

Thanks for the help - not bad support for an Easter Sunday!
OK,

If I ask for HW only, pins 6,7,8 and 9 of the Danfoss wiring box are
live! This doesn't sound right!

I think from what you say pins 8+9 are the boiler and pump.

If I drop the stat temp, then 8 and 9 go off.

That sounds right.

The boiler is on pin 9, which in turn is linked to pin 8 (as per the
installation sheet) - which seems OK.

Pin 7 is the "HW off" from the stat, I think

Hope this is starting to make sense to someone!

I think this might help. http://tinyurl.com/3fyca I'm assuming the
wiring you have is as this diagram is, if it's different then what I
said could be totally wrong.
If I were you I would check the wiring at the clock, stat etc and
ensure it is all right.
--

SJW
A.C.S. Ltd.


Thats the controller / wiring box I have. - I was about to post the
same link!

It appears that the connection I have to pin 7 is permantly live. I
will check it out in the morning to see if I have wired the tank stat
incorrectly.

Can someone remind me the function of the connections on the tank
stat?

Cheers,


Matthew



Of checked the wiring to the cyl stat and there was a problem! I have
now fixed it.

Pin 7 is now only live when when it the tank is hot


(Note - a 240v test screwdriver glows slightly (on pin 7) when the
tank is cool and then brightly when the tank is hot - is this a
function of the valve?)

Which of the connections to the valve should be live for just the hw
to be heated?

Cheers,


Matthew