Intelligent Control underfloor heating commissioning

As previously explained, the Intelligent Control system can be configured in several different ways.  The following section will deal with the commissioning of a full system master (WLM - 2FS) linked to add-on modules (WLM - 2AO).  We will assume that there is also the outside Weather Compensation module (WLOC) and at least one fully programmable clockstat sensor (WLCT).  This particular setup will cover the majority of installations which have been designed and specified by Begetube UK Ltd.  The one main difference which can occur is when a basic master (WLM - 2BA) has been used.  In this case the basic master is purely operating the individual zones via their thermostats and not controlling the water temperature.  A typical example of this is when there is already a dedicated low temperature circuit suitable for underfloor heating (i.e. ground source heat pump or dedicated circuit from a boiler management system).

There are two main aspects to commissioning the Intelligent Control system: The settings within the Master Control box and the settings of the individual room thermostats, in particular the fully programmable clockstat sensor.

Master Control Box

The WLM-2FS Master Control box has a graphic display to enable simple programming using simple to understand icons and symbols.  Full details and explanations of the symbols can be found in the user manual that comes with the control box and this should be studied in detail.  All the preset factory settings (which are highlighted in the user manual) are applicable to a Begetube design and specification, but can be altered once the system is up and running to maximise economy and comfort levels.  For example, the settings relating to the compensation curve can be changed to increase or decrease the output of the system.

During commissioning, the Master Control box is very useful for checking the correct operation of all the room thermostats and monitoring the read-outs of the various sensors.  To view this information, access the service menu indicated by the spanner symbol and detailed on page 3 of the WLM user manual.

First check that all thermostats are communicating with the Master Control box, this is found in sub-menu 2a (thermostat listing 00 through to 15).  Use the zone schedule found on your 'as fitted' wiring diagram to determine how many thermostats there are, if they are all fitted correctly, an 'OK' symbol will appear beside each numbered thermostat.  If there is a problem with one or more thermostats, an error number will appear (E1 - E9).  A full explanation of all error codes is given on page 4 of the WLM user manual.  Any error codes have to be cleared thus resulting with an OK symbol beside each thermostat connected.  The most common problem that results in error codes being the incorrect wiring of the 5 volt bus system.  The polarity of the bus must be maintained throughout the system.  If the polarity is not maintained this will result in communication being lost between the thermostats, the Master Control box and add-on modules.

IMPORTANT POINTS:

• Ensure every thermostat has been set to the correct channel number as per the zone schedule shown on the 'as fitted' wiring diagram particular to the project.  Inside each thermostat there is a setting pot which is numbered 0 to 9 and A to F. 1 to 9 on the pot corresponds to outputs 1 to 9 and A to E corresponds to outputs 10 to 14.  Position 0 on the thermostat is used for any clock thermostat which is situated in a central position, is not sensing its own zone, but is being used for time and temperature settings of other zones.  Position F is not used.
  
  
• Begetube UK will always specify and supply a thermostat which includes a floor sensor (WLTD) for use in wet areas e.g. bathrooms, shower rooms etc.  This gives the ability to keep a minimum temperature within the tiled floor whilst still controlling the room air temperature.  To choose the minimum temperature control function you must remove the 'jumper' from the circuit board within the thermostat (see detailed instruction supplied with the thermostat).  Leaving the jumper fitted gives the ability to set a maximum floor temperature, which can be used to protect areas with expensive hardwood flooring.

Clock Thermostats

WLCT clock thermostats can be used, either as a room control, or as a customer interface where it is acting as a control point, and not sensing its own zone.  In either case, the WLCT can be told, via the menu, to control any of the 14 zones of heating, at the times and temperatures that it is set for.  For example, bedrooms may need to be brought up to temperature at different times to living rooms.  If two WLCT's are employed, one can be programmed to operate all the bedroom zones, and the other to control the living zones.  Generally one WLCT clock thermostat will have been supplied per floor or per main area.  In this case, the WLCT for each group of zones can either be one of the room controls, or they can be remotely mounted in, for example, the kitchen, and then the whole house heating can be operated from one position.  Refer to the CAD drawing for information on sighting each type of sensor, it will show which type of sensor is used in each controllable area.  The final positioning of each sensor should be done taking the normal rules into account.  As many clock thermostats as are required can be used, up to a maximum of 9 over and above the 14 individual room thermostats.

Each WLCT can be set to carry out two or four switching events per day, i.e. one or two events to increase the temperature and one or two events to decrease the temperature.  A different temperature can be set at each event.  If the clock thermostats are being allocated to a group of sensors, as is normally the case, the sensors within that group then have the ability to give the end user a further ±4°C control over the settings in the clock stat.

To ensure the maximum efficiency of the system the end user should program in appropriate time and temperature settings into the clock stat(s) and allocate these settings to the other sensors in its area/floor level.

Full operating and setup instructions for the clock thermostat (WLCT) can be found in the operating instructions section. With regards commissioning the system, the following procedures must be carried out.

• Set the correct channel number inside every thermostat (1 to 9 corresponds to channel 1 to 9 and A to E is 10 to 14) See zone schedule on 'as fitted' wiring diagram for the particular project.
  
  
• Set the day and time (see operating instructions, item 1)
  
  
• Programme the heating operating times and temperature (see operating instructions, item 3)
  
  
• Allocate the correct sensors to the clock thermostat (see operating instructions, item 4, ArEA)
  
  
• Set minimum and maximum floor temperature limits (see operating instructions, item 4, HiLi)