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Once you have purchased your Soleheat underfloor heating system from us, the next step is installation. Below we have laid out everything you should need to help you install and set up your system. If you have any further questions please feel free to contact the Soleheat technical team.
As part of your underfloor heating system, we have supplied you with a Heatmiser Slimline digital room thermostat. When the system is running, make sure that the room thermostats are set at 20°C, the system is designed to work at 20 to 21°C – which is an appropriate indoor temperature for the UK. The pump speed should be set to speed 3. The mixing valve is normally set to 45°C for concrete floors and 55°C for timber suspended floors. If for some reason the rooms aren’t heating up, the flow temperature on the mixing valve can be increased.
If the system is making any noise, then it is possible that air is in the system. The air can be removed from the end caps on the manifolds, similar to a radiator system. Make sure that the system is operated for 24 hours before making any adjustments so it can settle.
Note, the system should operate 24 hours a day during the heating season, this is the most efficient way to run it. The Heatmiser Slimline thermostat comes with set-back, so you can set the room thermostats to drop 5°C at night for example and in the morning the system can respond quickly to return to the required daytime temperature, see instructions provided for the Heatmiser Slimline.
Room thermostats are normally fitted 1.5 m from the floor, located near to the light switch. Try to avoid positioning them in direct sunlight as it will affect their readings.
The maximum heat output for an underfloor heating system is 100 W/m2 for concrete floors and 70 W/m2 for timber suspended floors. For any underfloor heating system to work efficiently, the property needs to be built to current building regulations. Carpet and underlay together should not exceed 2.5 Tog.
If you are using the underfloor heating for a Conservatory, note that it will extend the time you can use the Conservatory for. It will not keep it at 20°C all year as the heat losses are higher than 100 W/sqm in a Conservatory. This is also generally the case where radiators have been fitted.
Condensing boilers are very
If the project is a small flat and the combi boiler is only providing underfloor heating and hot water, it is possible to install the system minus the control unit, provided there is a safety device fitted to the boiler to prevent flow temperature getting adjusted above 60°C.
Underfloor heating systems can be mixed with conventional radiator systems. Also note that the underfloor heating system needs to be a
If you are using a heat pump, please make sure that the heat pump company specify a pump that can cope with the underfloor heating duty as you might not need our control packs with heat pumps.
We recommend a minimum of 50mm of Polyurethane insulation for the underfloor heating system. This is very
Note we do not supply the insulation. Any builders’ merchant will have Celotex or Kingspan insulation in stock. The quote is based on clipping the pipe direct to the insulation board. We do supply pipe clips. With concrete floors, we recommend 65mm – 75mm of screed on top of the insulation.
For stone and ceramic tiles, flexible adhesives and grout are recommended. Avoid carpet underlays of the felt and rubber crumb type. With Vinyl, check with the manufacturer that it works with underfloor heating and laminate flooring should always have an expansion gap, to allow for movement.
As WCs and Bathrooms are generally small areas, extra heat might be needed. Therefore it is standard practice combine towel rails with the underfloor heating in these areas.
If there are metal parts in the system, it should be flushed with Fernox or a similar product. For an average size UK property (
Before the screed is laid the system must be filled with water and fully vented of air. This can be best achieved using mains pressure through the two filling valves at the end of the manifolds. All valves should be closed and the flow filling valve connected with a hose to the mains water supply, with the return filling valve connected to a hose leading to a
One by one, the flow and the return valves are opened and closed, purging the loops of air. Ensure that all the red caps on the return manifold are closed. Open the upper ring on the end cap 2 to 3 turns. Open the first red cap and then open the return end cap. Wait until
When this is completed and the filling valves closed off, the pumps should be run for five minutes and the air vented again at the air bleed valve on the filling valves until all air is bled from the system. Do not fill the system from the boiler filling loop.
The system should be pressure tested with 5 bar pressure for 24 hours prior to laying the screed.
The manifolds are supplied with options for individual control for each room. On the return manifold (the red caps), actuators can be mounted for individual control. If a programmable room thermostat with a
The following is an approximate guide to how far each loop should be adjusted:
Size of Loop
10 – 30 metres
40 – 60 metres
60 – 90 metres
|90 – 100 metres|
If the return manifold is not heating up, there is either air in the system or the flow and return from the boiler is incorrectly fitted. Run the pump on speed 3. The system must be on for 24 hours to confirm that all the loops are working. Also, check that the correct room thermostat controls the correct actuator.
The points below summarise all the information to bear in mind:
1) Screed or chipboard flooring should be laid immediately after pipelaying to protect the pipe.
2) Concrete screed floors must be cured before any heat is applied, a general rule of thumb is to allow 1 day per 2 millimetres of
3) Timber floor with
4) Hardwood timber flooring must be ‘conditioned’ before fixing.
5) It is important to purge the pipework from the boiler to the manifold, to avoid air being introduced into the underfloor heating system.
6) Fit actuators to valves after connecting the control wiring.
7) The actuators are fitted with a red plastic clip that holds the actuator and valve in the open position,
8) It is important that the actuators are screwed tightly
10) Increase the setting by 2°C per day, up to a maximum of 50°C for concrete floors, max 65°C for timber floors.
11) The flow & return from the boiler should be connected to the manifold connections shown using compression couplings.
12) NOTE: When first starting up the system it may take 12-24 hours for the heating effect to become apparent!
Note, if there is a risk for the air temperature dropping below freezing, then you must protect the pipes and manifolds from freezing conditions. It is always recommended to lay screed on top of the pipes as soon as they have been pressure tested.
Should you require any further information please do not hesitate to contact one of our Soleheat specialists.
If you have a radiator system you may consider setting your system up like this: