iSERIES – OUTDOOR

Technical specifications for outdoor units
Refrigerant flow/volume regulation via centralised PID control system acting on a vectorial inverter and electronic expansion valves.
SVPWM180°, vectorial inverter with sensor less 180° PWM; this is a purely sinusoidal inverter with extremely low electromagnetic noise emissions. It provides constant control of the permanent magnet synchronous motors throughout their 360° revolution (180°+180°). This optimises torque, a key factor in motor control for compressors in particular, thus providing excellent performance in terms of output, efficiency and quietness, especially at low rotational speeds.
Multi-processor platform based on the client/server model, with an operating system controlling the motors and microprocessors dedicated to application management fitted in the outdoor and indoor units.
Standard RS485 bus communication via shielded bi-polar cable: the highest level of communication security is ensured thanks to a balanced interface normally used for industrial applications. The bus provides an address for each unit and can be wired either as a bus or in a star configuration starting from the outdoor unit. This allows the system to be expanded and developed whilst still ensuring compatibility between units. One advantage of the RS485 bus is the possibility of supplying the units in the system with power either in a centralised manner or each to unit independently.
Compact and sophisticated electronics, built using SMD technology, resin coated for protection from atmospheric agents and equipped with certified hardware protection circuits.
Diagnostic system for the easy identification of any technical faults, with data logging for technicians accessed directly from bus RS485.
BootLoader for software updates for outdoor and indoor units, with no risk of losing flash eprom data.
Automatic restart following power black outs, with the same operating parameters as before and restart protected against over pressures.
Heat exchangers in high quality copper/aluminium with inorganic hydrophilic aluminium, which does not emit odours and provides top performance in heat exchange output and efficiency.
Maximum installation flexibility, thanks to the specifications governing pipe length and height difference between units.
Rust-proof treatment, providing the best protection against corrosion and rust formation even under extreme conditions such as in saline mist.

 

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iSeries Operation Limit

 

iSeries Modulation

iSeries Modulation

By using state-of-the-art DC Inverter technology, iSeries modulates the power of each outdoor unit from 10% to 130% of the nominal value (the compressor decreases or increases the rotational speeds based on the approximate 100% value).
In this way the compressor continues to operate in modulation, also with heat loads as low as 600 W (AEI1G110), thus avoiding the on/off cycles of other models featuring less sophisticated electronics.
On the other hand, the unit can automatically supply in excess of the nominal power, unlike most traditional multi-split systems, which need the manual activation of the turbo function.
The advantages include:
increased efficiency thanks to lower energy consumption (no on/off cycles)
greater speed and precision to reach and maintain the required temperature.
The borderline values for the operation of the outdoor units range from -50°C to +50°C, within which the self-protection mechanisms are activated. Many installations exist in Scandinavian countries, which operate with temperatures around -30°C, and others in desert areas with outside temperatures of around 50°C. Obviously, at these temperatures the performance is much lower than the nominal values but operation is guaranteed in any case. The wide operating external temperature range should be underlined to describe the iSeries’ high construction quality compared to products of a lower standard. Perfectly operating installations exist at both -32°C and +50°C.
All outdoor units are fitted with two heating elements as standard: one in the unit base to prevent the formation of ice in heating mode (70 W) and one in the compressor casing to prevent the lubricating oil from freezing when the unit is in stand-by (30 W). Both elements are regulated and managed by the system electronics to be activated only when strictly necessary.

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iSeries – mono/multi

The same indoor units can be used for residential and commercial (package) applications. Different product lines no longer exist. A solution never seen before.
All the outdoor units of the iSeries range may be used in both mono-split (one indoor unit connected with an outdoor unit according to the selection tables) and multi-split configuration (several indoor units connected to an outdoor unit according to the selection tables) without any modification and/or without any special setting required.
Simply, the system adapts to the configuration automatically. This characteristic makes the iSeries unique in the market. As a matter of fact, all brands of air-conditioning systems propose the same indoor units for both mono-split and multi-split configurations (a feature which our units also have)..

iSeries defrost

iSeries defrost

The process of ice prevention and elimination on the heat exchanger of the outdoor unit (needed for any air/air heat pump) in heating mode is managed by an Intelligent Defrost and Non Stop Operation function.
In most traditional products this process takes place by inverting the cycle (from heating to cooling mode) so that the heat exchanger of the outdoor unit is sent to the hot gas flowing out of the compressor, allowing the defrosting of the heat exchanger. This leads to a sudden decrease in the temperature of the heat exchanger of the indoor units. The unit fans are stopped to prevent the infiltration of cold air into the room.
iSeries manages this procedure differently. If the control system does not detect any special temperature or humidity conditions in the outdoor air, the unit does not invert the cycle but rather adopts the gas by-pass technique. Basically, part of the gas leaving the compressor is sent to the heat exchanger of the outdoor unit so that it is possible to eliminate the accumulated ice. A quantity of hot gas continues to be sent to the indoor unit (the operation mode is always on heating). By doing so, the heat exchanger of the indoor units remain at a temperature apt to heat the environment.
In addition to this function, iSeries dynamically understands whether it is possible to keep the fans of the indoor units active to continue to provide heat to the environment.
Example: if an environment is 15° C and the system is on Intelligent Defrost, the function called Dynamic Cold Draft recognises that it is still possible to heat the environments (thanks to the fact of having the heat exchanger of the units at a much higher temperature than the same environment) and will therefore keep the fans at the maximum speed possible based on the temperature difference between the heat exchanger and environment. Vice versa, if the environment is at a temperature that is very close to the one of the heat exchanger, the system will avoid sending cold air and causing discomfort to the users by stopping the ventilation.