SCREWLine⁴-i (WDAT-iZ4) is the new air cooled liquid chiller for outdooor installation, with HFO R1234ze refrigerant, inverter screw compressor and microchannel coils.

WDAT-iZ4 series is available from 204 kW up to 1055 kW and is the best solution for seasonal efficiency, being able to propose SEER values up to 5.24.

• Range 204 – 510 kW: Unit with 1 refrigeration circuit e 1 inverter compressor
• Range 422 – 1055 kW: Unit with 2 refrigeration circuits e 2 inverter compressors

Eco-friendly solution
The use of R1234ze refrigerant, with a very low GWP (Global Warming Potential < 1), guarantees a quite zero environmental impact, making it the best choice for all future-oriented systems that are looking for an eco-friendly solution.

Advanced technology
Inverter dual-rotor screw compressors, High efficiency EC fans with continuous speed regulation, Full aluminum micro-channel coils, 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
• Reduce the refrigerant charge by up 30% compared to traditional coils
• Ensures a null starting current 

Low noise operation
The use of inverter compressors allows to drastically reduce the sound levels at partial loads compared to units equipped with fixed speed compressors (-5 dB (A) with load <60%). Ideal for all noise-sensitive applications.

Maximum adaptability
Capacity load from 100% to 15% and wide operating range from +50°C (full load) to -10°C of external air temperature, are able to satisfy the requirement of multiple operating conditions. Many options and accessories are available to suit the needs of each plant.

Compact Size 
The space savings are an increasingly important aspect in the design of the building. 
Thanks to the new layout, the WDAT-iZ4 units are among the most compact units on the Market.

Already complies with 2021 requirements
From 2018 the Commission Regulation 2281:2016, also known as Ecodesign LOT 21, set minimum seasonal efficiency levels to place products on the European market. The minimum seasonal efficiency levels will increase further from 2021 (Tier 2). WDAT-iZ4 is already conforming today to both requirements.

Perfect for LEED
All WDAT-iZ4 models 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.