Intelligent Control underfloor heating overview

Intelligent Control multi zone system - incorporating weather compensated flow temperature.

The following pages detail a typical intelligent control system with reference to plant and wiring diagrams.  Since there are many different ways that this control system can be configured, Begetube UK will always supply as fitted CAD, plant & wiring diagrams specific to the job supplied.  Ensure that you have these specific diagrams and use them along with the following section which is designed to give the electrician, heating engineer and end user a good overview of the complete installation.  Please ensure that you read all extra notes on the diagrams as they are important.  It is imperative that both the electrician and heating installer completely understand what they are responsible for, as it is very difficult to install cables and pipe work after a certain stage in the build schedule.

The plant layout details the flow and return pipe work needed to correctly connect the manifold(s) to the heat source.  The plant diagrams also show how to integrate a typical domestic hot water system and high temperature radiator system mechanically and electrically.  As we do not know the length and route of flow and return pipe work, this has to be sized by the on site heating engineer.  Specific manifold loadings are available from your supplier - please ask, do not guess.

After the plant and wiring diagrams there is a page which details the correct fitting of the 4 port mixing device.  This information should be studied prior to any flow and return pipe work being installed.

General Overview

The Intelligent Control System is designed to accurately manage a multi zone underfloor heating system.  The controls consist of a master control box and up to a further 2 add on modules giving the ability to control a total of 14 individual areas. The WLM Master Module can control up to 6 outputs (1 to 6), each WLM ADD ON Module can control another 4 (7 to 10 on ADD ON 1, and 11 to 14 on ADD ON 2).

The positioning of the Master Module and ADD ON Modules will be clearly marked on the CAD pipe layout drawing specific to the project.  These are normally always shown and fitted adjacent to the underfloor heating manifold(s) so that thermal actuators can be directly connected to the module terminals.

The Master Control Box comes in two versions. The full system master (WLM-2FS) is the version which is capable of also controlling the supply water temperature to the underfloor heating manifolds.  The basic master (WLM-2BA) only controls the individual room sensors and zoning. The following typical scheme in this section shows the full system master version with two add on modules complete with the outside air sensor.  This system provides a compensated flow temperature to the underfloor heating manifold(s).  As stated before Begetube UK will always supply as fitted wiring and plant diagrams specific to the project.

Unlike previous underfloor heating control systems, the Intelligent Control utilises a 5 Volt, 2 core bus system to connect all room sensors together.  The room sensors are simply 'daisy chained' together using a 2 core light duty cable (bell wire or speaker cable is acceptable). The core size should not exceed 1 mm² but preferably 0.25 - 0.5mm² stranded cable with the two cores identified. This 2 core bus system is then connected back to the Master Control box.  The daisy chain can be made into a ring, with both ends connected to the Master, or can be run as two or more separate chains, each connected to the Master.  It is also possible to use conventional star wired systems, but you may need to employ separate connector strips to connect into the Master. In either system the thermostats must only be connected to the Master module and not to any add on modules.  The outside weather sensor can also be connected to any point on the chain or directly back to the Master.