Water-Cooled Screw Chillers - Withair® Heating and Cooling, Air Conditioning, Heat Pump, Chiller, Industrial Process Cooling & Heating Systems, and Indoor Air Quality

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Water-Cooled Screw Chillers

Capacity Range: 35 to 1000 tons, 50 and 60 Hz
Refrigerant: R-134a, R-407C, R-1234ze, R-513A
Compressor Type: Semi-hermetic Screw

High Flexibility
High Reliability
Low operating cost
Infinite capacity control
Low environmental impact
Heat recovery function for hot water as option
Microprocessor controls with optional BAS interfaces
Advanced semi-enclosed twin-rotor screw type compressor
No current spikes at start-up, always lower than full load current
Wide range of cooling capacity using one, two or three compressors
Superior performance of high-efficiency shell & tube heat exchanger
Multilevel (0-25% to 50% & 75% - 100%) and continuous control as option
Unit adopts PLC control technology, "a key start" and automatic operation
Compact footprint, compact design through stacked heat exchanger layout

OVERVIEW
MODELS
OPTIONS
RESOURCES
SERVICES
RELATED PRODUCTS

Overview

Meet Efficiency, Noise and Sustainability Challenges Head On

We have optimized our series of water cooled screw chillers to help you maximize efficiency, benefit the environment and reduce operating expenses. With HVAC costs making up 40% of commercial building energy consumption, the right chiller represents an incredible opportunity to reduce the energy intensity of the world. But first, it needs to perform for you.
Infinite Capacity Control

Cooling capacity control is infinitely variable by means of a single screw semi-hermetic compressor controlled by microprocessor system. Each unit has infinitely variable capacity control from 100% down to 25%. This modulation allows the unit to perfectly match the cooling or heating load and consequently providing without any leaving water temperature fluctuation. This water temperature fluctuation is avoided with a stepless control.

With a compressor load step control in fact, the compressor capacity, at partial loads, will be too high or too low compared for example to the building cooling load. The result is an increase in energy costs, particularly at the partload conditions at which the unit operates most of the time.

Units with stepless regulation offer benefits that the units with step regulation are unable to match: the ability to follow the system energy demand at any time and the possibility to provide steady outlet water temperature without deviations from the setpoint.
Application Flexibility

The chillers can satisfy a large variety of applications not limited to traditional comfort cooling but industrial process, brine water, ice storage...

This range is the result of careful design, aimed to optimize the energy efficiency of the units, with the objective of bringing down operating costs and improving installation profitability, effectiveness and economical management.
Wide Range of Applications

The Withair’s Water-Cooled Screw Chillers are designed for all the conveniences of chilled, air-conditioning systems, from reducing your facility’s carbon footprint, to cutting operating costs, energy-efficient units are tailored to fit almost any application. especially for hotels, offices, malls, hospitals and process cooling applications of modern manufacturing industries.
Optimise Energy Efficiency,
High Flexibility and High Reliability

With modulating valve, low operating cost and high flexibility with infinite capacity control can be achieved. Also, with the careful design that aimed to optimise energy efficiency and high reliability, this product is the ideal choice for indoor installation or retrofit projects.
Compactness

The chillers is designed to achieve the smallest possible footprint making this product the ideal solution to allow easy indoor installation for restricting spaces or refitting operations and easy transportation. Thanks to the stacked installation option, it is also possible to further reduce the installation space of two units.

Models

Single head system

co Specifications	W02C2-130S1	W02C2-180S1	W02C2-230S1	W02C2-280S1	W02C2-350S1	W02C2-420S1	W02C2-470S1	W02C2-560S1	W02C2-620S1	W02C2-650S1	W02C2-740S1
Capacity (Ton)	35	51	66	80	99	120	134	160	176	185	210
Capacity (kW)	130	180	230	280	350	420	470	560	620	650	740
EER (kW/kW)	4.80	4.72	4.85	4.96	4.83	4.81	4.80	4.76	4.77	4.86	4.97
Compressor	Screw	Screw	Screw	Screw	Screw	Screw	Screw	Screw	Screw	Screw	Screw
Evaporator	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube
Condenser	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube
Voltage	380, 460	380, 460	380, 460	380, 460	380, 460	380, 460	380, 460	380, 460	380, 460	380, 460	380, 460
Frequency	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60
Refrigerant	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)
Heat Recovery	Option	Option	Option	Option	Option	Option	Option	Option	Option	Option	Option
VSD Version	Option	Option	Option	Option	Option	Option	Option	Option	Option	Option	Option

Dual heads system

co Specifications	W02C2-350S2	W02C2-465S2	W02C2-555S2	W02C2-700S2	W02C2-765S2	W02C2-835S2	W02C2-950S2	W02C2-1115S2	W02C2-1230S2	W02C2-1300S2	W02C2-1485S1
Capacity (Ton)	100	132	158	200	218	238	270	317	350	370	422
Capacity (kW)	350	465	555	700	765	835	950	1,115	1,230	1,300	1,485
EER (kW/kW)	4.80	4.72	4.85	4.96	4.83	4.81	4.80	4.76	4.77	4.86	4.97
Compressor	Screw	Screw	Screw	Screw	Screw	Screw	Screw	Screw	Screw	Screw	Screw
Evaporator	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube
Condenser	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube	Shell & Tube
Voltage	380, 460	380, 460	380, 460	380, 460	380, 460	380, 460	380, 460	380, 460	380, 460	380, 460	380, 460
Frequency	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60
Refrigerant	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)	R-134a R-513A (low GWP)
Heat Recovery	Option	Option	Option	Option	Option	Option	Option	Option	Option	Option	Option
VSD Version	Option	Option	Option	Option	Option	Option	Option	Option	Option	Option	Option

Factory Installed Options

Unit Options

Brine Version
Condenser Double Flanges Kit
Cu-Ni 90-10 Condenser Tubes
Condenser Four Passes
High-pressure Side Manometers
Low-pressure Side Manometers
Compressor Soundproof System
Double Pressure Relief Valve with Diverter
High Temperature Kit
Refrigerant Leak Detection
Stacked Installation
High Evaporator Leaving Water Temperature
Vibration Isolators
Rubber Antivibration Mounts
Evaporator Inlet Strainer
Double Evaporator Insulation
Partial Heat Recovery or Total Heat Recovery
Integrated Pump Packages
Condensate Overflow Switch
Stainless Steel Heat Exchanger
Stainless Steel Frame
Flanged Water Connection Kit
Container & Transport Kit
Anti-corrosion Cabinet and Structure Version

Controls Options

Modbus, BACnet Communications Interface
Withair® Wireless Components
Door Mounted User Display
Remote User Interface
Fault Detection & Diagnostics
Flow Switch
Remote Input
Remote Output

Electrical Options

Soft Starter
Compressor Thermal Overload Relays
Under/Over Voltage Control
Energy Meter
Capacitors for Power Factor Correction
Current Limit
Condenser Flow Switch
Compressor Circuit Breakers
Ground Fault Relay
High Short Circuit Current Rating
Ground Fault Protection
115V Convenience Outlet
Power Connections
Multi-Point Power with Disconnect Switch

Resources

Name	Size	Download
Withair® Packaged Rooftop & Split DX Systems-Line-Card.pdf	550KB	Download
Withair® Solutions Offering-Line-Card.pdf	4.00MB	Download
Withair® HVACR SYSTEM SOLUTIONS OFFERING_2025 Version.pdf	3.54MB	Download
Withair® Water-Cooled-Chillers-Line-Card.pdf	483KB	Download
Withair® Air-Cooled-Chillers-Line-Card.pdf	679KB	Download
Withair® Air-Cooled-Heat Pumps-Line-Card.pdf	721KB	Download
Withair® Ground(Water)-Source-Heat Pumps-Line-Card.pdf	502KB	Download
Withair® Industrial Process Cooling & Heating Systems-Line-Card.pdf	506KB	Download
Withair® Air-Side-Products-Line-Card.pdf	1.69MB	Download