new programmer wiring

[Steelmasons]

Call for CH goes into terminal 7 along with call for HW , term 7 is HW off (NC) which would be the reason for the permanent link across 3-7 , seems to me the earth core into term 8 could be perm live? , can't really see what other purpose it is serving. , unless of course it is used to power the grey on a mid position valve. , OP needs to post what controls he has.

Rip it out and start again.

 

[doitall]

Call for CH goes into terminal 7 along with call for HW , term 7 is HW off (NC) which would be the reason for the permanent link across 3-7 , seems to me the earth core into term 8 could be perm live? , can't really see what other purpose it is serving. , unless of course it is used to power the grey on a mid position valve. , OP needs to post what controls he has.

Rip it out and start again.

You certainly confused me this time.

3 is CH on.
6 is HW on.
7 is HW off.
8 is HW com.

normally you add a link L-5-8 for 240vac.
the link between 5-6 means there's permanent HW.

 

[Steelmasons]

the link between 5-6 means there's permanent HW.

Only when programmer is set to 'HW ON' , with gravity HW/pumped heating term 8 would be boiler switched live (no linky across 5 and 8.

 

[doitall]

So what do you think the 2 extra wires in HW off (7) are for. ??

 

[Steelmasons]

So what do you think the 2 extra wires in HW off (7) are for. ??

Haven't a clue as the OP doesn't say which controls he has , my guess being this was a gravity HW/pumped heating system that has been modified in some way , the only core exiting from term 7 on a G/P system would be linked to term 3 and power room stat/pump.

 

[Paulbacca]

I think there may be a motorised valve. Could this explain it?

 

[D_Hailsham]

Call for CH goes into terminal 7 along with call for HW , term 7 is HW off (NC) which would be the reason for the permanent link across 3-7 , seems to me the earth core into term 8 could be perm live? , can't really see what other purpose it is serving. , unless of course it is used to power the grey on a mid position valve. , OP needs to post what controls he has.

3 is CH on.
6 is HW on.
7 is HW off.
8 is HW com.

normally you add a link L-5-8 for 240vac. Right
the link between 5-6 means there's permanent HW. Wrong

It's very simple, if you look at the diagrams.

It is wired as in Basic System 1 or Basic System 2 (see pic) depending whether there is a room stat.

Untitled

• D_Hailsham
• 7 Aug 2013
• 1

 

[Steelmasons]

Yes very basic DH.

Thanks for the linky.

 

[Paulbacca]

So will this config transfer to the rwb29 timer or do I need a different timer?
Ta

 

[D_Hailsham]

So will this config transfer to the rwb29 timer or do I need a different timer?

Working on it.

Terminal 7 (2nd from left)) of the ST699 has two black wires connected, which seem to go into separate cables. I would only expect one, going to the pump. Can you confirm where the two black wires go?

Can you also say if there is a room thermostat and a stat on the side of the HW cylinder?

The current arrangement allows you to have any combination of heating on/off and hot water on/off. The Siemens, if it's possible, will allow you to have hot water by itself in the summer but, in the winter you will have to have heating and hot water on at the same time.

 

[Paulbacca]

Yes to both. There is a cylinder and room thermostat.

 

[doitall]

Is there any motorised valves.

What is the make/model of the boiler.

 

[Paulbacca]

Glow Worm Hideaway 60B. I believe there is a motorised valve.

 

[doitall]

Can you post a pic of it please.

 

[D_Hailsham]

Yes to both. There is a cylinder and room thermostat.

Thanks, but what about the two black wires?