Accessories

The BT series storage tanks are used in heating and cooling systems, to ensure minimum heat pump operating time in all operating conditions and avoid excessive starts and stops. It can also be used to isolate the water circuit from the heat pump and to partially meet energy demand during periods in which the unit is shutdown due to the electricity rate.

The HWC storage cylinders are made especially for domestic hot water production in combination with heat pumps, thanks to the inside coil with large heat exchange area.
The heat pump is connected to the inside coil that heats the domestic hot water contained in the storage tank. The Legionella prevention cycles are managed by an electric heater that can be installed in the fitting provided on the flange. The Legionella prevention cycles are managed by the Nadisystem controller on the heat pump.

Domestic hot water production is guaranteed by the DOMH2O15 and DOMOH2O24 instant kits combined with the TPS storage tanks. The TPS storage tank is used to store water heated by a heat pump, and allow further supplementary heat from solar heating. In addition, tank connections are also available for other sources of heating, for example gas- or wood-fired appliances.
The instant domestic hot water production kit draws energy from the storage tank and via heat exchange with the plate heat exchanger ensures the correct domestic hot water temperature, controlled by modulation of the primary circuit pump in the DOMH2O. The latter features a control unit with graphic display to allow the user to monitor operation, as well as set the set point and operating parameters.

The 1-1/4” 3-way valve deviates the flow of water to the domestic hot water storage tank when the temperature read by the probe falls below the set point. The valve is managed by the heat pump controller.

The single-phase immersion electric heater can deliver 1 kW, 2k W or 3 kW depending on the electrical connections, and must only be used in immersion, via the water connections provided on the HWC storage cylinders or the BT, TP and TPS storage tanks.
The electric heater guarantees Legionella prevention or works to supplement domestic hot water production at low outside temperatures. If used inside the TP storage tanks it can help meet building heating demand in the event of operation outside of the heat pump operating limits.

The outlet electric heaters are available with power ratings of 3 kW single-phase and 3, 6 and 9 kW three-phase. Used on the system outlet, these guarantee the heating demand of the building at low outside temperatures by supplementing the heating capacity of the heat pump. The electric heaters are deactivated as soon as the heat pump alone can meet heating demand. Considering that normally the heat pump operates only a short time at low outside temperatures, operation of the supplementary heater is also reduced and consequently power consumption is negligible. Therefore the system’s seasonal energy efficiency remains unchanged.

The N-THC thermostat is fitted as standard with temperature and humidity probe for correct control of the temperature-humidity conditions inside the room. By using the N-THC thermostat in the system, Nadisystem can control 5 different zones, managing temperature, humidity and time bands independently. The simple and functional backlit display allows rapid viewing of the settings and environmental conditions.

The main features are:
- Room temperature and humidity setting (temperature and humidity probe supplied as standard)
- Operating mode setting: heating, cooling, automatic mode changeover
- Enable domestic hot water production
- Served zone on/off
- Program time bands
- Wall mounted (maximum distance 500 metres)

The Nadisystem control system for residential applications gives high operating flexibility, activating zone pumps and valves depending on the set room temperature, and controlling mixing valves to ensure the correct water temperature in radiant systems according to the climate conditions set for each circuit. With Nadisystem there up to 15 different types of system pre-configurations for quick and easy installation, and up to 5 remote keypads for controlling thermal load in likewise zones. The N-EM1 expansion module is used to connect the secondary circuit components and corresponding zone thermostats depending on the selected configuration. Up to 3 expansion modules can be used to create more complex systems.

The N-CM keypad allows cascaded connection of up to 4 heat pumps to increase capacity delivered in applications with multiple occupied areas, such as hotels, schools, apartment blocks, offices and shopping centres.
This ensures fine control over the capacity delivered, without decreasing performance, and more precise system sizing. Nadisystem can determine how many cascaded units are needed to guarantee domestic hot water production, all or just one, according to requirements.
The controller also balances compressor operating hours based on time logic, activating the units in rotation. The N-CM keypad can also display the operation of each heat pump connected to the cascade and the N-THC room terminals assigned to the zone in question, up to a maximum of 5 zones.

The N-RS is an optional card for directly interfacing the heat pumps to an RS485 network. The card guarantees opto-isolation of the controller from the RS485 serial network. The maximum baud rate available is 19200 baud. The optional card is fitted in the comb connector on the unit’s board.