Changing switchmaster 400 for lifestyle lp241

[dyfedrob]

Hi - I currently have a switchmaster 400 connected to a back boiler and hw cylinder. The controls are " timed/off/constant" and "water or heating & hot water"

How do I wire-up the lp241 as there are only 2 black wires on the existing set up ? When I use terminals 3 & 4 the hot water fires up, but when I select the central heating, the pump comes on but the boiler doesn't fire up !

I can't seem to find any information on the lp241 and can't get my head around the wiring diagrams online

There is NO thermostatic control on the system other than trvs

 

[PlumbBobBob]

http://www.akhheating.co.uk/images/downloads/LP241 Instructions.pdf

 

[Unregistered]

Thanks Steve, but I've got it wired on 3 & 4 as per the table. When I select heating only, the boiler doesn't fire, but the pump comes on ?

 

[Unregistered]

Cancel That ! All sorted - changed the pin at the back, as it was set for a pumped system - all working ! Many thanks, Rob