Changing programmer question..

[flyingsparks]

I have changed a Switchmaster 400 programmer for a Horstmann 425 Diadem electro-mechanical programmer. The customer has now said it is not working properly, however I am not sure what is happening. What I was wondering, is on the old Switchmaster 400 there is connection '2' which doesnt show what it does, see the picture:

Untitled

• flyingsparks
• 13 Dec 2010
• 2

Untitled

• flyingsparks
• 13 Dec 2010
• 1

Link to the new Horstmann programmer:
http://www.horstmann.co.uk/downloads/ElectronicDocuments/Central-Heating/425-InstallationGuide.pdf


There was 2 wires going to this connection but I have left them with the new programmer just in a connector, as I thought terminal 2 on the Switchmaster was being used as a connector. Or is terminal 2 'hot water off'??

I'm not sure what the heating system type is (ie Y / S plan etc).

The Switchmaster 400 has settings for 'water' or 'heating and water' and no option for just heating...

All help appreciated as I need to go back tommorow and sort this..

Cheers.

 

[londonboy]

It looks like you are correct, I.e its just a loop terminal.

Could possibly be HW OFF, incorrectly marked up I suppose?

 

[flyingsparks]

But its not working with the connection in a terminal block!? So think it muct be something else?! Thanks.

 

[flyingsparks]

Anyone?! Please!

 

[seco services]

its more likey connected to a switchmaster 3 port valve (blue)
then it don't need a hw off as its 6 wires on a switchmaster not 5 and doesn't have a hw off.

 

[stem]

You could power up the old switchmaster on a bench and connect a flying lead to terminal 2. Then switch the hot water and central heating 'on' and 'off' whilst connecting a multimeter across terminal 2 and the neutral to find out if it ever becomes 'live' or not.

 

[seco services]

you won't get nothing out of term 2 it is a blank terminal.

 

[ban-all-sheds]

I have changed a Switchmaster 400 programmer for a Horstmann 425 Diadem electro-mechanical programmer.

Could you tell us what you've connected to terminals 1-6 on the new backplate?

The customer has now said it is not working properly

What do they mean by that?

 

[ericmark]

Many programmers have a switch and or stop to allow the same programmer to be used with motorised valve control of domestic hot water and thermo-syphon control. One has 16 options the other is much reduced.

 

[flyingsparks]

Thanks for all your replys, she phoned back this morning saying that now she thinks it is working properly, shes getting on and I think doesnt quite understand the new programmer! For your info, terminal 2 is not connected, there is no pin on the programmer!! Thanks anyway. Chris