Underfloor Heating Commissioning

Thermo-Floor are experts at underfloor heating design, installation and the important commissioning stage. We have installed and commissioned underfloor heating for projects involving over 400 apartments within a large structure development and many self build dwelling projects Only after the finishing layer has been applied over the pipes and has hardened naturally for approximately 5 weeks, may the underfloor heating be started up.

Check curing duration with screed and floor finish supplier for specific applications and comply with instructions. Underfloor heating commissioning is a four stage process as described below, including the initial stages and all year round. This includes first day actions and consideration to seasonal adjustments.

Underfloor heating commissioning is a four stage process as described below, including the initial stages and all year round. This includes first day actions and consideration to seasonal adjustments.

1 - First Day of Underfloor Heating Operations

The first day of heating operations Open valve A and B. On the first day, set the water temperature of the floor heating at approximately 25°C by setting the thermostat (TRV) on the manifold or by setting the boiler thermostat to a lower temperature. Then each day raise the water temperature by 5°C up to a maximum of 50°C. Only then will the water contained in the screed/concrete be able to evaporate from the floor. When starting the system for the very first time it may take a relatively long time (up to one week) before the water in the underfloor heating pipes and the floor surface gets up to temperature.

This is because the screed/concrete floor is still very damp. It is only after the floor has completely dried out, that the underfloor heating will be working at its best. Be sure to check that the primary water temperature going into the manifold is at least 60°C or higher.

2 - Check The Maximum Underfloor Heating Thermostat

Check whether the maximum thermostat on the unit is fitted and connected according to the provided wiring diagram. When supplied with an adjustable limit stat make sure it is set to a maximum of 55°C.

3 - Check for Tightness after 14 Days

Check whether all the couplings on the manifold are tight (if necessary tighten a little). Also check the whole system for tightness.

4 - Use Underfloor Heating in Spring & Summer, Autumn

If you want to use the floor heating in the spring, summer and autumn, the water temperature of your central heating system may be too low to enable the underfloor heating to work perfectly. In that case turn up the room temperature thermometer higher than you usually do and if installed, close any radiators you are not using completely or partially. (But always leave one radiator valve open). Set the boiler thermostat at 60°C minimum. In this way you can use the underfloor heating effectively during mild weather.

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Underfloor Heating Design

Underfloor Heating Installation