Operational Principles of the Marine Chiller System

Our central chilled water air-conditioning system is designed for yachts, commercial vessels, and other marine environments requiring efficient and silent climate control.
The system consists of a central cooling unit—typically installed in the engine room or auxiliary equipment space—and multiple fan coil units (fancoils) connected through insulated piping or flexible hoses.

In cooling mode, chilled water produced by the central unit is circulated by high-efficiency pumps to the fancoils located in each cabin. The fancoil fans transfer the cooling capacity to the cabin air, maintaining a comfortable environment. As the water absorbs heat, it returns slightly warmer to the central unit, where it is re-cooled for continuous circulation.

In heating mode, the built-in four-way reversing valve changes the direction of the refrigerant flow. This enables the system to transfer heat—normally discharged into the seawater during cooling—back into the circulating water loop, efficiently heating the cabins without additional energy demand.

Each fancoil and the main chiller operate independently, with separate electronic controllers for individual temperature and mode selection.
Every chiller unit is factory-tested, pre-charged with refrigerant, and quality-certified for leak-free and reliable operation before shipment.

Product Features

Compact and robust design with AISI 304 stainless steel housing.
Electrostatically powder-coated, oven-baked components for superior corrosion resistance.
High-efficiency rotary, scroll, or piston compressors, depending on model capacity, with built-in thermal protection.
Filter drier on refrigerant line for moisture and impurity control.
Four-way reversing valve for seamless cooling/heating operation (on heat pump models).
Gas accumulator to prevent liquid return and protect the compressor.
Fully automatic, digital chiller controller with user-friendly interface.
Accessible component layout for simplified maintenance and service.
Top-mounted electric box designed for easy access and safety.
Dedicated circulation pump and expansion tank for flexible installation configurations.
Compressor timer protection during short power interruptions.
Automatic system shutdown and error diagnostics for pump or operational failures.
Compressor operation balancing feature for 2-stage or 4-stage systems (optional).
LED indicators for cooling, heating, standby, and error status.
High/low-pressure manometers on each refrigeration circuit for accurate monitoring.
Digital temperature display for return and leaving water readings.
Cu-Ni (Copper-Nickel) coaxial condenser, self-cleaning and extremely resistant to seawater corrosion.
Zinc anode protection against stray electrical currents.
Multiple-Stage Chillers: NHM / NHD / NHT / NHQ Series

Our multi-stage chiller series—NHM (Mono), NHD (Twin), NHT (Triple), and NHQ (Quadro)—is specifically designed for medium to large yachts and vessels that require ultra-quiet operation and minimal cabin equipment footprint.

Each unit includes independent compressors and cooling circuits, providing redundancy, energy efficiency, and smooth load distribution.
Standard single-stage units are available in capacities from 30,000 BTU to 155,000 BTU, with larger custom configurations upon request.