Underfloor Heating DIY

Underfloor Heating - DIY Installation Instructions

Filling the System

Once both circuits are installed the system must be filled and pressure tested.

For this you will need mains water supply and a garden hose; follow the step by step instructions below.

• Open the fill+drain points on the flow and return manifolds (turn slot to run vertically).
• Shut flow connection by turning red cap clockwise.
• Shut return connection by turning allen key clockwise (located under cap).
• Close bottom pump valve (turn slot to run horizontal).
• Connect mains water supply to the flow (bottom) fill+drain point and another piece of hose to the return (top). The top hose pipe can be put into a bucket.
• Turn on the water. It will now enter the flow manifold and flow through the circuits until it exits the hosepipe connected to the return manifold.
• Let the water flow until all air has been purged from floor pipes.
• Open bottom pump valve to completely fill manifold and open the manual bleeders momentarily.
• Close fill+drain point on the flow manifold (top), allow pressure to rise to 3 bar and close fill+drain point.
• The system is now filled and under pressure.
• Check for leaks and note pressure. The pressure may fall slightly due to stabilization and temperature changes - if the pressure falls to zero there is a leak.
• Carry out a final check to make sure there are no kinks in the pipe circuit.
• Check pressure after 24 hours.

Study the boiler connection and wiring diagrams, and make sure that the relevant trades are given the required information.

Switching on the Floor Heating

Turn on the power and check that the clock stat is calling for heat and isolating valves are open.

The boiler, pump and manifold pump should all run.

Check that all zones can work separately (heating, hot water and underfloor heating).

Set water temperature to low (2/3) on the thermostatic head.

Slowly raise the temperature over a few days.

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Part of the UK Underfloor Heating Group