Vaillant ecotec combi and a tower rf stat/programmer

Joined
1 Dec 2009
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Location
Kent
Country
United Kingdom
Hi
My parents want me to fit the above rf unit to their vaillant combi ( which has the standard mechanical clock fitted ).
Can anyone tell me what wires i connect to once the clock has been removed.
The rf unit has live-in,live-out and neutral. It is also has the option of removing a link to made it volt free, is this used volt free with the vaillant?
Many thanks in advance
 
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