It is available the new SCREWLine⁴-i (WDAN-iK4 MF) series, the new air cooled multifunction heat pump for outdoor installation, with R513A refrigerant, and inverter screw compressors. The WDAN-iK4 MF series is the ideal solution to meet the simultaneous needs of hot and chilled water in four-pipe systems (4T configuration).

It’s available in Excellence energy version (EXC) which offers high efficiency in all operating modes: SEER up to 5.18 and SCOP up to 4.21.

The capacity range varies according to the 3 selectable acoustic levels:

• Acoustic configuration with compressor soundproofing (SC): Range 523 – 990 kW
• Silenced acoustic configuration (LN): Range 512 – 937 kW
• Super-silenced acoustic configuration (EN): Range 450 – 876 kW

Further strenghts 

Eco-friendly solution
The use of R513A refrigerant, with a low GWP (Global Warming Potential = 631), guarantees an environmental impact that is more than halved compared to traditional R-134a refrigerant (GWP = 1430).

Advanced technology
Inverter dual-rotor screw compressors, High efficiency EC fans with continuous speed regulation, Copper aluminum coils with hydrophilic treatment, are some of the technologies available on SCREWLine⁴-i which offers:

• Perfectly match the cooling load of the plant in any condition
• Follow the load also with a great staging
• Ensure high efficiency values, reducing operating costs
• Ensures a null starting current

Low noise operation
The WDAN-iK4 MF series offers 3 acoustic levels, without changing the unit dimensions:

• Acoustic configuration with compressor soundproofing (SC): basic version
• Silenced acoustic configuration (LN): -8 dB (A) compared to SC
• Super-silenced acoustic configuration (EN): -12 dB (A) compared to SC

Maximum adaptability
The capacity modulation from 100% to 18%, the double refrigerant circuit, the extended operating limits that guarantee the operation all year round, with outdoor temperatures from -10°C to +46°C and hot water production up to +60°C even during the summer season and cold water down to -8°C even in winter, are able to meet the needs of any system. Many options and accessories are available to suit the needs of each plant (such as: integrated hydronic assemblies on/off or inverter, stand by or parallel).

Protection and maximum durability
All the components of the refrigeration circuit are protected from atmospheric agents for maximum duration over time. The technical compartment has been designed to minimize the sound impact thanks to the specific soundproofing.

Defrosting smart management
The regulation of the unit in winter period optimizes the defrost cycles to satisfy the system cooling request, avoiding changes in operation and loss of efficiency, furthermore the hydrophilic treatment applied on the coils facilitates the drainage of water making the defrosting cycles more effective.

Compliant with 2021 Requirements
The WDAN-iK4 MF series complies with the most stringent requirements of the Commission Regulation 2281:2016 in force from January 2021.

Perfect for LEED                                                                                                                      
The WDAN-iK4 MF series satisfy prerequisites 2 and 3 of Energy and Environment thematic area. Furthermore, they match the parameters of Credit 4 that allows to achieve 2 points (Leed 2009). The correlated data are included in the technical bulletin.