TWA/FC 202÷1062 VV/H

Aircooled liquid Chillers Free-Cooling with axial fans, Screw (Inverter) compressors and shell and tube exchanger

The liquid Chillers of the TWA/FC 202÷1062 VV/H series, with HFO-R1234ze refrigerant, offer innovative technology to meet the needs of large systems for both domestic as well as industrial applications requiring the production of cooled water continuously year-round. The latest generation refrigerant HFO-R1234ze, with GWP<1 (Global Warming Potential), is the most environmentally sustainable refrigerant on the market, and meets the strictest international environmental regulations.
During the cold months, in FREE-COOLING operating mode, the liquid returning from the system is cooled directly by forced convection of outdoor air through the condensing coil, thus saving energy by not operating the unit's Screw compressors. A 3-Way valve system is controlled by the electronic microprocessor controller, allowing functioning in CHILLER, FREE-COOLING or MIXED (simultaneously CHILLER and FREE-COOLING) modes.
Are available as option the new EC Inverter fans with high available static pressure and efficiency.
Units are compliant to ErP 2021 European Regulations for process cooling application if provided with EC or ECH accessory (EC Inverter fans).

Versions

TWA/FC - Cooling only

Power range

232-1144 kW
66,0-325 Ton

Features

Structure with supporting frame, made of galvanised sheet metal with additional protection provided by polyester powder coating.
Screw compressors with built-in oil separator, suction filter, crankcase heater, oil sight glass, thermal protection and stepless capacity steps.
Axial fans directly coupled to an electric motor with external rotor.
Condenser made of copper tubes and aluminium finned coils combined with FREE-COOLING coils.
Shell and tube evaporator with two independent circuits on the refrigerant side and one on the water side, complete with water differential pressure switch.
Cooling circuit shut-off valves on discharge and liquid line.
Electronic expansion valve.
Electronic high and low pressure gauges.
Electrical board includes: main switch with door safety interlock, fuses, thermal protection relays for compressors and thermocontacts for fans.
Condensing Control is included: electronic proportional device that ensures efficient and continuous functioning of the unit with outside air temperature down to –20 °C. It also allows to reduce the sound level especially at night. It consists of a fans speed controller with continuous speed regulation, high and low pressure transducers on cooling circuit and an electrical heater on electrical board.
Microprocessor control and regulation system.

Accessories

Factory fitted accessories

IM Automatic circuit breakers
SL Unit silencement
DSV Double relief safety valve with changeover switch on the high pressure side for each refrigerant circuit
DSVHL Double relief safety valve with changeover switch on the high and on the low pressure side of each refrigerant circuit
BT Low water temperature kit
EC EC Inverter fans
ECH EC Inverter fans with high available static pressure
TX Coil with pre-coated fins
SP Inertial tank
PU Single circulating pump
PUI Inverter single circulating pump
PD Double circulating pump
PDI Inverter double circulating pump
SPU Inertial tank and single circulating pump
SPUI Inertial tank and Inverter single circulating pump
SPD Inertial tank and double circulating pump
SPDI Inertial tank and Inverter double circulating pump
GS Single circulating pump gasket for glycol >30%
GD Double circulating pump gaskets for glycol >30%
II Inverter on one compressor and soft start for other compressors
ID Inverter on all compressors
SS Soft start
WM Web Monitoring - Wireless remote monitoring (GPRS/EDGE/4G/TCP-IP)
IS Modbus RTU protocol, RS485 serial interface
IST Modbus TCP/IP protocol, Ethernet port
ISB BACnet MSTP protocol, RS485 serial interface
ISBT BACnet IP protocol, Ethernet port
ISS SNMP protocol, Ethernet port
IAV Remote set-point, 0-10V signal
IAA Remote set-point, 4-20mA signal
IAS Remote signal for second set-point activation
IDL Demand limit from digital input
CP Potential free contacts
MN High and low pressure gauges

Loose accessories

CR Remote control panel
RP Coils protection metallic guards
AG Rubber shock absorbers
AM Spring shock absorbers
FL Flow switch