How It Works: Retrofitting Low Profile Underfloor Heating

SCOPE OF SUPPLY FLEXIRO-10 KIT UNDERFLOOR HEATING WITH CLIP RAILS

Please refer to the PDF installation guide for the kit components. You will also find further accessories and suitable tools in the FLEXIRO Shop.

NOTE:

The same also applies to the FLEXIRO thin-bed underfloor heating system: working on heating systems requires sufficient technical knowledge and skills. If necessary, have the installation carried out by a professional installer.

IMPORTANT INFORMATION BEFORE STARTING THE INSTALLATION

Determine the arrangement of the heating circuits. The installation position of the Kompa Box should be chosen so that the heating pipes from all heating circuits can be routed directly to the Kompa Box without extending the heating pipes.

Note: Kit 2.5 m² = 1 heating circuit; 5.0 m² = 2 heating circuits; Kit 7.5 m² = 3 heating circuits and 10.0 m² = 4 heating circuits

The underfloor heating pipes can generally be shortened. However, it must be ensured that the differences in length between the individual connections are not too great (max. 15% differences in length).

IMPORTANT INFORMATION BEFORE STARTING THE INSTALLATION

Avoid crossing pipes in order to take full advantage of the low construction height of thin-bed underfloor heating.

Always make sure that the plastic pipe is cut straight and burr-free. The pipe must not be squashed or kinked.

The installation of distributors and pipes does not require any special tools.

PREPARING THE INSTALLATION

The existing substrate must be level, clean, dry and load-bearing. Any primers can already be applied.

Before laying the pipes, determine the position of the connection distributors for the underfloor heating. The arrangement of the heating system and the positioning of the KOMPA boxes can be planned individually. Please ensure that the control valve can always be reached later. It must be possible to insert the pipe ends into the individual connections after assembling the manifolds. (Note the height from the floor)

INSTALLING THE KOMPA BOX SINGLE ROOM CONTROLLER

In order to provide efficient temperature control, the Kompa Box should be positioned in such a way that the thermostatic head can detect the temperature of the indoor air and the air can flow around it unhindered.

The separately enclosed installation and operating instructions must be observed.

IMPORTANT INFORMATION BEFORE STARTING THE INSTALLATION

At the beginning of the work, edge insulating strip which is at least 20 mm wide should be laid around the area that will have floor heating. Columns and similar structures should also be edged with insulation strip to allow the entire floor structure to expand.

A permanently elastic joint sealant should then be subsequently applied to the edge insulating strip.

IMPORTANT INFORMATION BEFORE STARTING THE INSTALLATION

Edge insulation strip after being installed

LAYING THE CLIP RAILS

The clip rails are fixed directly to the floor. This can be done, for example, with screws and dowels, knock-in dowels or building adhesives.

Before installation, the planned heating area should be marked out on the floor.

LAYING THE CLIP RAILS

When installing the clip rails, make sure that they are adequately fastened. It should no longer be possible to move them in a horizontal or vertical direction after they have been installed.

The clip rails should lie flat on the floor to ensure that the pipes are securely fixed.

LAYING THE CLIP RAILS

When laying the underfloor heating, all distances specified in the installation drawing must be observed. The clip rails are fixed at 40 - 50 cm intervals, and at 10 - 25 cm intervals in areas where the pipe bends.

LAYING THE HEATING PIPES

The optimum starting point for laying the pipes is near the distributor arms in order to keep the pipe length for the connection as short as possible.

Various installation patterns for laying out the pipes are possible, for example meander- or snail-shaped installation.

LAYING THE HEATING PIPES

The minimum spacing between the pipes is 10 cm. The distance between the underfloor heating and the perimeter walls should be at least 5 cm. A minimum bending radius of 8 cm must always be maintained in areas where the pipe bends.

LAYING THE HEATING PIPES

Cut out any kinks or damaged areas on the heating pipe. The pipe must be reconnected with a permanently tight coupling (plug-in connector). The coupling must be protected from direct contact with the casting compound by wrapping it in PE film. The position of the coupling must be marked. After this repair the pipes may have to be extended.

LAYING THE HEATING PIPES

The plastic pipe is pressed into the clip rails

LAYING THE HEATING PIPE

Meander-shaped laying of the underfloor heating system

LAYING THE HEATING PIPE

The pipes should be laid without any twisting. The pipe overhang in the bend area should be approx. 10 - 25 cm. The loops can be fixed with dowel hooks.

CONNECTING TO THE KOMPA BOX

The distributor arms are connected to the Kompa Box with a Eurocone screw connection. The Eurocone has a self-sealing effect while the metal screw connection has a purely safety-related function. Over-tightening should be avoided as this would compromise the safety of the heating system.

CONNECTING TO THE KOMPA BOX

The arrangement of the heating pipes in the Kompa Box is shown here. The heating pipes are connected to the distributor arms by means of a simple plug-in assembly. The heating pipes that have just been cut and possibly shortened are inserted directly into the plug-in connections of the distributor arms up to the stop.

CONNECTING TO THE HEATING SYSTEM

As a rule, you can integrate your FLEXIRO underfloor heating system into the existing heating system parallel to the other radiators or instead of a radiator.

Make sure that the supply and return lines are correctly connected in the KOMPA Box. Mixing up the supply and return lines in the KOMPA Box will disable the thermostatic valve and prevent the underfloor heating from functioning.

Connecting the KOMPA Box to the heating system

Laying the connection hoses from the Kompa Box to the heating system

PRESSURE TESTING THE HEATING SYSTEM

Make sure that the system and all associated components are correctly installed before operating the underfloor heating system. The pressure test pump is offered as an accessory.

TESTING THE FLOOR HEATING

Be sure to carry out a trial run before embedding the pipe system. This is the last chance to correct installation errors or repair damage!

APPLYING THE FLOOR SURFACE

The underfloor heating must be turned off when applying the self-levelling underlayment (levelling compound)!

The minimum construction height is 12 mm if a ceramic floor surface is chosen.

With other floor surfaces, the self-levelling underlayment should provide an additional covering of at least 5 mm above the heating pipe. All floor coverings must be rated "suitable for underfloor heating".

COMMISSIONING (HEATING UP PROCESS)

After completion and once the surface covering has naturally dried, the heating-up process is carried out. If you have laid tiles, do not begin operating the underfloor heating system until the tile adhesive has completely hardened. The heating-up is usually carried out according to a heating-up protocol. It is essential that you follow the manufacturer's instructions in this regard.

INSTALLATION DRAWING LAYING UNDERFLOOR HEATING ON CLIP RAILS

Thin-bed underfloor heating with clip rails, laying pattern: meander-shaped

FLOOR HEATING INSTALLATION PLAN CLIP RAIL VERSION

Thin-bed underfloor heating with clip rails, laying pattern: bifilar