Intelligent Control underfloor heating wiring

The chart below details the first fix wiring for a system which is using a Master control box along with a further two ADD ON modules.  You will find a specific first fix wiring schedule on the 'as fitted' wiring diagram supplied with the job.  Details on how to wire the sensors together is as previously explained (general overview).

All other connections are carried out as normal.  The boiler output B1 and B2 is volt free, to suit virtually all boilers, an extra wiring diagram is shown on the as fitted wiring diagram detailing how it can be made into a 240V switched live.  Main pump and secondary pump connections are Live/Neutral.

Provision is made on the master module for connecting a boiler or primary pump, and also the underfloor circulating pump.  These are termed main and secondary pumps respectively (P1 & P2).  The boiler pump does not have to be used if the boiler has an integral pump within its own system.

Each add on module also has a separate output for a local circulating pump if the system is using multiple manifolds, and local pumping is included.  However, if only a single UFH circulating pump is employed, with multiple manifolds, and add on modules are used for the room control, then the single UFH pump (P2) should be connected to the MAIN pump terminals of the master and not to the SECONDARY.  If the main pump is already being used for 'primary" pump control, an alternative connection method is to use the secondary pump output on the master, but also connect from the pump L terminal from each add on module to the secondary pump L terminal on the master.  This ensures that a demand from a zone within the-add on module group will also start the single circulating pump.  The 'as fitted' wiring diagram will clarify which method to use.

Full range of sensors

WLCT Clock sensor	WLTD Sensor with setting mode and limit sensor	WLTA Sensor with ±4°C local Adjustment	WLTP Tamperproof sensor

FIRST FIX WIRING SCHEDULE (240 volt CABLING)
Heating System Spur to MASTER	1mm² 2 core + E
MASTER to 1st add on Module	1mm² 3 core + E
1st add on Module to 2nd add on Module	1mm² 3 core + E
MASTER to Mixing Valve Actuator	1mm² 3 core + E
MASTER to UFH Pump P2	1mm² 2 core + E
MASTER to Boiler Pump P1	1mm² 2 core + E
MASTER to Limit Sensor (mix supply see CAD)	1mm² 2 core
MASTER to Boiler	1mm² 2 core + E

5 VOLT BUS CABLING: From Master Module link all sensors together using 2 core 0.25mm² speaker cable along with the outside sensor.

From the Master Module to the 1st add on Module link with 4 core 0.25mm², link 1st add on Module to 2nd add on Module with 4 core 0.25mm².

At Begetube UK we always promote the use of Weather compensated systems.  If you have a full system master control box (WLM-2FS) an outside air sensor (WLOC) will have also been specified and supplied.  The outside air sensor is wired into the 5 Volt bus system the same as all the room sensors.  This gives the system the ability to provide a compensated flow temperature to the underfloor heating circuits further enhancing the overall operation.  This sensor should be fitted on an outside north facing wall ensuring that it does not receive direct sunlight.  Also ensure that this sensor is not fitted close to any other heat sources ie. flue outlets, bathroom extract vents or exterior halogen lamps.

The WLTD Sensor is preferred for bathroom use because it has an extra floor sensor, in addition to the room sensor.  The purpose of the floor sensor is to act as a maximum or minimum limit for the floor surface temperature.  Max or Min is chosen by a jumper position on the sensor pcb.  It is the minimum function that is used when controlling a 'wet room', this gives the end user the ability to have a warm tiled floor all year round irrespective of the air temperature.  The limit temperatures are set on the master, or if the zone is being controlled as part of a group via a WLCT clock sensor, the limit settings can be changed via the Hi Li menu on that clock thermostat.  Refer to instructions for correct fitting of the floor sensor.  The maximum temperature limitation function can be used to protect the floor area from becoming too warm.  This may be required if special floor surfaces (real wood) are used.

Notes for the Heating Installer

• Pay careful attention to flow and return connections onto the manifold.  The flow from the boiler is indicated in RED and the return to the boiler is indicated in BLUE.
• The floor heating 4 port mixer should be supplied by an uninterrupted flow and return from the boiler.  Definitely not tapped off the end of a radiator system.  Please refer to the instructions.
• The size of the connections onto the 4 port mixer supplied is not a guide to the size of your flow and return pipe work. For example, if we have supplied a ¾" valve it may well still need 1" flow and return pipe work.  Please size pipe work in accordance to the size of the heating load and the length and nature of the pipe run.
• As with all heating systems, the flow and return pipe work and boiler system should be power flushed to remove any debris before it is connected and opened up to the manifold(s).
• It is also advisable to install an in-line filter on the main flow from the boiler.  This will protect all equipment attached to the boiler system, in particular the UFH manifold(s).
• If in doubt please get in touch with your supplier.

Notes for the Electrician

• Study the wiring diagrams and ensure you have enough cables in place at first fix stage.  It is very difficult to add in cables once the build schedule has passed a certain stage.
  
  
• Please note that some rooms may have two or more groups of pipes in them and only the one room thermostat controlling them all.  This means you can have more than one actuator wired to a single output from the master control box or add on modules.
  
  
• Please note that all heating controls should originate from a common spur/fuse and should have one point of isolation.
  
  
• If in doubt please get in touch with your supplier.