You shall read the following guide and observe either the piping and wiring diagram if you have checked your underfloor 
heating pack and want to perform diy installation.
This underfloor heating guide will take you to sections such points and notes to remember before performing installation (related to pipework, control motorized direction, the fitting, filling and commissioning, about the manifold, how to fit and connecting pipe to the manifold, testing the pressure of the system after filling, switching on the floor heating, how to program clock stat and thermostatic valve.
The schematic wiring diagram for either with and without boiler can also be found in this guide. Full guide on How to Perform Underfloor Heating Installation can be found in this DIY Home Repair of pdf filetype (source: underfloorheatingdiy.co.uk)
