Our modular air-cooled water chiller introduces an innovative modular design and parallel connection, which means that if there is any problem in one module, others still work well. This design also allows the motors a partial activation in certain cooling load occasions. In addition, a fully automatic RTR defrosting technique is also introduced, a WARM patented technique, to achieve excellent heating capacity. The modular air-cooled water chiller is mainly applied in hotels, shopping malls, office buildings, gyms, entertainment centers, and other locations where a separate charging is required.