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Floor Convectors

How to prevent condensation forming on full length windows and glass?

Floor convectors are a great solution to problems that can occur with condensation forming on low level windows due to the temperature difference created by your hydronic heating system between your indoor and outdoor conditionsFloor Convectors consists of a heat exchanger in which hot water flows from the heating source (e.g. a boiler). A fan which is located in the convector, draws cold air from the room and pushes it through a heat exchanger where it is heated. Warm air is distributed towards the windows, inhibiting condensation from occuring.

What connection type does the convector\\\'s heat exchanger have and how is it best connectable?

The exchanger has ½'' connection, similar to that of a radiator. The pipeline can be either of low-carbon steel, plastic-aluminium (two-pipe system) or Radia-Noxy 16x2, 2 mm polybutylene pipe (star system).

What maintenance is required on a floor convector?

Very minimal maintenance is required for a floor convector. The grille on a floor convector can simply be removed and vacuumed to remove any loose dirt. While vacuuming, take care not to bend the soft aluminium fins on the heat exchanger. We also do not recommend using powerful industrial style vacuum cleaners for vacuuming dirt from convector fans as this may cause damage. .

Can floor convectors be used for cooling?

UNICOIL LE and ME floor convectors with fans, can be used for heating as well as cooling. Heat Pump Systems are extremely efficient and are a great solution if you are looking to heat and cool you home or office

Floor Heating

Can I lay parquetry floor or carpet onto floor heating?

When laying carpet over a hydronic floor heating installation it is necessary to take into account a partial reduction of the heat output from any such system. We do not recommend carpet with a pile higher than 10 mm and with a rubber backing, PVC, felt underlay and softwood floor shall not have a resistance greater than 0.15m 2.K/W. We recommend wooden flooring with a maximum thickness of 15 mm, made of well-dried hardwood. In the case of mosaic parquet floors the maximum thickness should be no greater than 9 mm.

How does floor heating work when the floor appears to be cold to human touch?

Hydronic Floor heating is a highly efficient low.temperature heating method. The water temperature only needs to be heated to around 40degC (compared to radiators which require a medium to high temperature. At a water temperature of 40 °C, the floor temperature is about 29 °C which is lower than your body temperature. Therefore, the floor appears "cold" when touched, but is actually radiating this heat evenly throughout the room and heating other surfaces including furniture and the people in the room. In comparison, an air conditioning system or gas ducted heating system only heats the air in the room but not the actual surfaces in the room.

Is it necessary to use a welded wire mesh for floor heating?

Many people believe in clamping the pipes onto a welded wire mesh. It is not necessary to add reinforcement of structural steel (welded wire mesh) in the concrete with a standard load in residential areas (max. load 300 kg/m2 of the area, 500 kg/m2 at the wall). We do recommend reinforcement in rooms with higher loads (e.g, garages, etc.). It is exclusively added over the pipes - so that it is in the lower third of the mixture and does not touch the actual pipes. Therefore we do not recommend fixing the pipes directly to the welded wire mesh.

What if I want floor heating everywhere but a radiator in the bathroom?

Radiators and floor heating systems require different water temperatures in order to adequately heat a room. In order to alleviate the need or creating a second higher temperature heating circuit for just one radiator, we can use a simple alternative solution. The ladder radiator in the bathroom can be connected as a separate circuit from the floor heating manifold in conjuction with the E-Z thermostatic valve for one-pipe systems. The second opening of the radiator may be equipped with a heating coil with a thermostat that will reheat the radiator to the desired temperature. Due to this we can reach the desired higher temperature of the radiator and it can work also outside the heating season. The solution is simple and effective.
It is now also possible to use a dual circuit gas condensing boiler which can have a 40degC circuit for the floor heating and a 65degC circuit for any radiators or floor convectors which are part of the system, and can also be used for your domestic hot water supply.

Is a combination of wall and floor heating possible?

Yes it is, and this combination is very effective in rooms where we want to eliminate the feeling of cold emitted from the walls in rooms such as a living rooms or a bathroom. The wall heating system itself is not in principle different from the floor heating system, but it uses a higher water temperature. Therefore, wall heating is usually designed as a separate heating circuit, combining two circuits with different inlet temperatures – a lower temperature for floor heating (up to 40 °C), higher temperature for wall heating (up to 50 °C). However, the two systems may be connected to a single temperature (up to 40 °C) but this reduces the performance of wall heating. When the systems are separate we can utilise the pipe work in the walls for cooling in the summer time providing that the system has been designed for this purpose, and connected to a chilled water source (e.g. a reverse cycle heat pump system).

Is it possible to repair a pipe in the floor/wall if it is accidentally drilled though?

Yes it is, and any such repair will require emerengcy action to be taken in the floor/wall. The concrete layer must be chiselled. The damaged part of the pipe must be cut off and connected by a 3/4" coupling and connecting screws or fusion welding (for polybutylene pipes only). It is then necessary to fill the part using a recommended construction material.
To avoid these problems, determine before drilling where the pipe is laid - see the answer to the question: How to locate the pipe work?
ve.

How to locate pipe work?

Pipe drilling can be easily avoided by using a metal detector (which can be borrowed from our company) with which it is very easy to determine the exact position of the pipes in the floor (Univenta Pipe has a 100% oxygen barrier in the form of Al-foil). Other tubes can be identified using thermal-foil (also available through Univenta). Floor heating is turned off for several hours to let the tiles cool down and then it is turned on again. Thermal-foil is laid on the surface of the examined place.
Note: After installing floor heating we always recommend taking a picture of all rooms before concrete pour, and the documentation should be archived.

Is there any negative impact of floor heating on indoor plants and flowers?

No, there is not. Thanks to optimal temperature distribution in the room and a favourable climate, floor heating is suitable for humans, indoor plants and flowers and pets. When using floor heating, you will even avoid cooler air at ground level, which occurs in the use of conventional radiator heating).

What boiler is suitable for floor heating?

For floor heating the best option is a suitably selected gas condensing boiler, because of its highest efficiency at a discharge temperature suitable for floor heating (about 40 ºC). In areas where there is no natural gas connection, we have heat pump systems which are also very high in efficiency.

What insulation is commonly used for under floor heating?

We commonly use hardened polystyrene 30 mm thickness for floors and 60 mm thickness for ground floors (two 30 mm thick overlapping polystyrene boards are used). The polystyrene density should be 20kg.m-3 and compressibility shall not exceed 10% of its thickness at a pressure of 10kg/cm2.
Special care must be taken in areas without a cellar where waterproofing is used so that polystyrene is not in contact with sealant coatings based on cyclic compounds and solvents that would result in the destruction of the polystyrene foam. In this case bitumen-rubber with glass fabric reinforcement must be used as insulation.

Does furniture that sits closely to the floor have any influence on reducing the performance of floor heating?

By using furniture with short legs the performance of floor heating can be reduced by up to 50% in that particular area. These factors will be taken this account when designing your Hydronic Floor System. Therefore it is necessary to assign the design of the floor heating system to a specialist and consult extensively with your designer about all aspects of your home. With furniture that has higher legs, the performance reduction is negligible.

Is there any noise produced by floor heating?

The sound of fluid circulating in the pipes can not be heard. A poorly designed and installed system can creates tiny air bubbles that can create noise when passing through the manifold, therefore we do not recommend placing the manifold into rooms intended for sleeping. However, the air in the system can be easily removed using a bleed valve. It is also possible to install Spirovent automatic separating valve into the heating system that can remove 100% of free air and up to 99.6% of air dissolved in the system.

What is the life expectancy of floor heating?

Floor heating is maintenance-free. The life expectancy depends on the quality of the materials used and technological elements that remove impurities or air from the system. Although the manifolds for UNIVENTA floor heating have an integrated system for capturing iron oxides, it is good to check floor heating manifolds and possibly clean the system once every two years. When using a 17x2.5mm polybutylene pipe, the manufacturer can guarantee the lifetime of this pipe for 25 years. The real life expectancy of the pipe is much higher (50-70 years), depending on the pipe type.

Is it possible to use a combination of radiators, floor convectors and floor heating?

It is preferable to have one heating system ie all Floor Heating or all radiators as we only need to heat all of the water to one temperature (40degC for floor heating or 65degC for radiators). However, with the use of a dual circuit condensing boiler and or an applicable mixing device, it is possible to have a combination of both. A combination is a great solution in situations where a renovation is taking place, and there are new concrete slabs being poured in certain parts of the house, but not through out the home. Floor Heating can be utilised in the areas where the new concrete slabs will be positioned, and radiators or floor convectors can be used in the other areas.

Is a good quality manifold important?

Although a manifold is quite a simple device in terms of its construction and fuctionalitly, it is an integral part of a hydronic heating system and its importance should not be underestimated.
Some companies use cheaper manifolds in order to keep costs down and to have a higher success rate in winning jobs, however Univenta are not prepared to jeopardise your hydronic heating system by using sub standard manifolds.
Univenta’s manifolds have an iron oxide capturing filter system, and are constructed in heavy duty material to prevent micro cracks which can result in a loss of heating fluid and can cause air locks in your system.
Univenta manifolds come with a 25 year warranty due to the industry leading quality of our European designed and manufactured manifolds.

Heat Pumps

How much energy do I save when I buy a heat pump?

Let's consider that heating with electricity will cost about $4,080 per year which is about 24,000 kWh per year. A heat pump with a coefficient of performance (COP) 4.5 consumes 5,300 kWh which means $901 per year. Thus we will save 18,700 kWh per year which is $3,179.

Heating Operation

What is the maintenance of floor heating?

Maintenance of a floor heating system is very simple, and can be carried out following a few very simple steps.. If you are not comfortable with carrying out these steps, please contact your installer who for a nominal fee can do this maintenance work for you.

The scope of required maintenance work, and the frequency of regular servicing that your floor heating system requires is determined by whether the heating system includes the following:

A valve for removing air from the system (automatic bleed valve or separating valve - e.g. SpiroVent),

If an inline filter to capture impurities is installed (automatic self-cleaning filter, manual self-cleaning filter, sludge filter, etc.)

If a distributor or manifold with an iron oxide trap is used (e.g. Univenta ULTIMATE), or whether the water in the heating system also contains a chemical agent such as UNIVENTA CLEARFLUID which prevents the formation of sludge, iron oxide particles and scale.

These features greatly simplify maintenance which in turn require minimal labour.
The heating service consists of the following steps if the heating system contains the component listed above.
replacing the net in a pipeline filter,
checking the operation of an automatic bleed/separating filter (the filter includes a button for manual start-up),
In the case that the system does not contain the above mentioned components (filter, air separator) the service of floor heating requires:
When flow meters on each circuit drop / or every 2 years (which ever comes first) check the floor heating manifold.
Every 5 years bleed the floor heating circuits if necessary. If the flow in a certain circuits drops significantly and there is not a sufficient heating in a certain room, flushing of the manifold will be required so sedimented impurities are discharged from the manifold.

How to proceed bleeding floor heating?

When heating is off the operation is as follows:
1. Close the ball valves on both manifold segments (supply and return).
2. Close all floor heating circuits with shut-off valves.
3. Connect the water supply to the inlet valve on the lower manifold segment and open the valve.
4. Connect the hose to the drain valve on the upper manifold segment, lead the hose into a collecting vessel and open the valve.
5. Open an appropriate (aerated) floor heating circuit with the valve head. Water flows into the lower manifold segment, flows through the open floor heating circuit pushing the air within the circuit to the upper manifold segment. Water flows into the collecting vessel. You can open the bleed valve and completely bleed the excess.
6. After bleeding the air, close the valves in the following order: bleed valve, heating circuit valve, relief valve, inlet valve.
Note: If necessary, you can also bleed other floor heating circuits according to the instructions described above. The given procedure also cleans the manifold so that it is free of sediments (sludge).

How to flush system?

Flushing is carried out as follows:
1. Close the ball valves on both manifold segments (supply and return).
2. Close all floor heating circuits with shut-off valves.
3. Connect the water supply to the inlet valve on the lower manifold segment and open the valve.
4. Connect the hose to the drain valve on the upper manifold segment, lead the hose into a collecting vessel and open the valve.
5. Open the last floor heating circuit (the farthest one from ball valves of the manifold) with the valve head. Water flows into the lower manifold segment, flows through the open floor heating circuit to the upper manifold segment and from it to the collecting vessel.
6. After removing impurities close the valves in the following order: heating circuit valve, relief valve, inlet valve.
Note: If necessary, bleed the manifold.
After performing service we recommend adding an additive to the system (chemical agent) preventing the formation of iron oxides and scale, according to the amount recommended by the manufacturer. This can be added using a pump (e.g. a pump to supplement solar fluid) or another suitable method.

Solar Collectors

Is there a difference in the quality and efficiency of solar collectors?

Currently, our market is infiltrated by collectors that are of poor quality, and do not have the durability to withstand our harsh Australian climate. Manufacturers often ignore the fact that these products do not need to have the Certificate. The life of the collector is therefore significantly reduced and the costs invested are not returned. Do not be attracted by a low up front cost, particularly if this low cost is due to a product of substandard quality. In poor quality solar collectors, after a few years, the insulative properties inside the collector are lost, and the result is a loss of heat to the atmosphere instead of to the heat being absorbed by the water in the collector and the result is a loss of efficiency. The decision whether to invest in high-quality materials or low cost solar collectors is therefore the responsibility of the customer, but with Univenta Solar Collectors, you can be assured of industry leading quality and efficiency.

How many collectors for hot water heating per a house?

One Univenta AUGUSTA Solar collector is approximately estimated for two people (the average water consumption of 50 litres per person). There is also good advice - the solar system should be optimally designed according to specific requirements due to the amount of water that should be heated to a certain temperature and the creation of reserves to overcome the days of low-intensity incident radiation. Avoid companies that try to convince customers that one or two collectors are enough, without considering the necessary information to make a calculated design.

What is the maximum temperature a solar collector can heat water to?

An average system in operation heats the water up to a temperature of 80 °C in summer months. It depends on the number of solar collectors in the system and the amount of water that needs to be heated. In winter months AUGUSTA Solar collectors can achieve an output temperature of up to 50 °C

What should I do if my roof does not have an ideal inclination and is not entirely favourable oriented to the north?

A simple solution in the case of an insufficient collector inclination is the use of a stainless steel structure that we make to order exactly according to customer's requirements. The disadvantageous orientation to the north is ideally solved by AUGUSTA Solar vacuum tubular collector where individual tubes can be directed in order to achieve the greatest gain from solar radiation.

Can solar collectors be used in winter for heating?

It should be particularly noted that the number of solar collectors is proposed based on the amount of water that must be heated to a given temperature. If the system was designed to hydronically heat your home in the winter, as well as heating your domestic hot water all year around you would require solar collectors of greater capacity, but in summer when you have greater solar energy available, it is necessary to dissipate this excessive heat. An ideal place to dissipate this excess heat is a swimming pool. A correctly engineered solar solution could greatly reduce costs of running your hydronic heating system in winter, and can heat your swimming pool for free in summer.

What is the difference between flat and evacuated tube collectors in terms of efficiency?

There are several differences. Flat collectors are very efficient from spring to autumn. Mostly mineral wool is used as insulation. Such collectors can not be completely sealed. In the winter months condensation can occur inside the collector and the resulting water deteriorates insulation properties of mineral wool. Collector life is therefore significantly lower in comparison to vacuum tube collectors. Evacuated tube collectors are used year-round, as thermal insulation in the Vacuum Tube Collectors are in a high vacuum, (the principle of a "thermos flask") so there is no leakage of heat to the environment.

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