BIASI Technology
BIASI boilers are equipped with a single-spiral, large-water-volume heat exchanger developed in 2016, consisting of 14 mm diameter "pear-shaped" tubes. An important element of the development was that the distance between the coils, ranging from 0.7 to 1 mm, allowed a fan with a pressure of 250 Pascal to be installed in the device.
This provides greater freedom for designers and contractors, as the maximum permissible drainage distances (60/100: 10 m, 80/125: 20 m and 80/80: 40 m) increase the number of installation options.
This type of heat exchanger also allows for a 1:10 modulation range and silent operation, as the "pear shapes" are positioned next to each other, so that the speed of the exhaust gases is only at its maximum at the smallest cross-section for a single moment. If the heat exchanger does become clogged, it is easy to descale, as there are no parallel pipe configurations.
The boilers calculate the modulation requirement not only from the temperature of the supply and return water, but also from the temperature of the exhaust gases, which further increases the efficiency of the product. Since mid-2017, only these heat exchangers have been used in Biasi boilers (Inovia Cond PLUS and Rinnova Cond PLUS).
The main components are products developed by SIT, such as the gas valve, control panel and fan. The changeover valve is located in the heating flow branch at the connection points of the hydraulic block and the boiler, which makes it much easier to determine the pipe layout, because in this case, due to the position of the changeover valve in the forward branch, we have two forward branches towards the heating and DHW sides and only one return branch, and in this case it makes sense to have a BIASI magnetic sludge separator filter located in the heating return branch.
The intelligent control panel assists the service technician not only during commissioning but also during maintenance. This process is facilitated by the fact that the menu program displays the instantaneous ionization current measured at the electrode, should the electrode need to be replaced. Maintenance is also facilitated by the ability to measure the instantaneous HMV quantity via the device menu.
This can also determine whether the secondary heat exchanger needs to be acidified or replaced. A second circuit room thermostat can be connected to the control panel, and the pump or zone valve of the newer heating circuit is activated when heating is requested. The company's devices already fully comply with the new 2018 ErP requirements with NOX class 6.