TWA/FC 281÷1431 TT/H

Aircooled liquid chillers Free-Cooling with axial fans, TURBOCOR (magnetic levitation) compressors and flooded shell and tube exchanger

The innovative TWA/FC 281÷1431 TT/H units, with HFO-R1234ze refrigerant and FREE-COOLING technology, are designed to provide an effective solution to installation requirements of large areas, both commercial and industrial, where the production of chilled water is required in continuous service throughout the year. 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. Furthermore, thanks to Turbocor compressors, the units perform with top efficiency at partial loads, low inrush currents, an excellent silent functioning and reduced weight. The unit, designed with specific attention to every aspect of construction and combined with the use of TURBOCOR dynamic partialization oil-free magnetic levitation compressors - managed by the TURBOSOFT self-adaptive electronic control - and with the use of flooded shell and tube evaporator, achieves a high rate of energy efficiency, with unequaled SEPR values, with minimum water content, and an excellent silent functioning. Depending on outside air temperature, the microprocessor controller manages the functioning in CHILLER, FREE-COOLING or MIXED (both CHILLER and FREE-COOLING) mode.
Are available as option the new EC Inverter fans with high available static pressure and efficiency.
The units are compliant to the 2021 ErP Regulation for process cooling application.

Versions

TWA/FC - Cooling only

Power range

279-1386 kW
79.0-394 Ton

Features

Structure with supporting frame, made of galvanised sheet metal with additional protection provided by polyester powder coating.
Semi-hermetic centrifugal compressors with dual Turbocor turbine, oil free, magnetic rising rotor, thermal protection, continuous capacity adjustment system thanks to built-in INVERTER, automatic anti-cavitation system. The power circuit of the compressor is fitted with a set of electrolytic condensers to control the rising in the event of a power failure, reactor for the power factor correction, EMI filter for electromagnetic compatibility.
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.
High efficiency flooded shell and tube type evaporator, with one independent circuit on the refrigerant side and one on the water side, complete with water differential pressure switch.
Cooling circuit shut-off valves on suction, discharge and liquid line.
Electronic expansion valve.
Electronic high and low pressure gauges.
HFO-R1234ze refrigerant.
Electrical board includes: main on-off switch with door lock, fuses, electronic/digital overload device to protect the compressors and thermocontacts for fans, interface relay and terminals for external connections.
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.
TURBOSOFT control and regulation system, equipped with RS485 serial interface, can be supplied with an optional Web Monitoring device for remote monitoring via GPRS/EDGE/3G/TCP-IP network.

Accessories

Factory fitted accessories

IM Automatic circuit breakers
EC EC Inverter fans
ECH EC Inverter fans with high available static pressure
TX Coil with pre-coated fins
PU Single circulating pump
PD Double circulating pump
GS Single circulating pump gasket for glycol >30%
GD Double circulating pump gaskets for glycol >30%
TS Touch Screen Interface
WM Web Monitoring - Wireless remote monitoring (GPRS/EDGE/4G/TCP-IP)
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

Technical data

			281	361	561	721	831	1071	1431
Cooling	Cooling capacity (1)	kW	279	348	554	698	837	1040	1386
	Absorbed power (1)	kW	75	95	160	193	242	283	387
	EER (1)		3,72	3,66	3,46	3,62	3,46	3,67	3,58
Cooling (EN14511)	Cooling capacity (1)	kW	277	345	551	694	831	1031	1366
	Absorbed power (1)	kW	77	98	163	198	248	292	407
	EER (1)		3,60	3,52	3,38	3,51	3,35	3,53	3,36
	SEPR (2)		7,35	7,30	7,13	7,25	7,42	7,43	7,43
Free-Cooling cycle	Air temperature (3)	°C	3,0	2,5	1,5	-1,0	0,0	0,5	-1,0
Free-Cooling cycle	Absorbed power (3)	kW	10,8	14,4	21,6	21,6	25,2	32,4	36,0
Compressor	Quantity	n°	1	1	2	2	3	3	4
	Refrigerant circuits	n°	1	1	1	1	1	1	1
	Capacity steps	n°	Stepless	Stepless	Stepless	Stepless	Stepless	Stepless	Stepless
Water circuit.	Water flow	l/s	14,42	17,98	28,63	36,07	43,26	53,75	71,63
	Pressure drops	kPa	88	103	78	94	101	142	253
	Water connections	DN	100	100	125	125	150	150	150
Electrical characteristics	Power supply	V/Ph/Hz	400/3/50	400/3/50	400/3/50	400/3/50	400/3/50	400/3/50	400/3/50
	Max. running current	A	173	181	347	347	505	520	678
	Max. starting current	A	25	33	199	199	357	372	530
Unit with pump	Pump available static pressure	kPa	140	125	110	180	150	150	160
Unit with pump	Water connections	DN	100	100	150	150	150	150	200
Sound pressure	STD version (4)	dB(A)	69	70	71	71	71	71	72
Weights	Transport weight	kg	3620	3730	5560	5640	7890	8910	10800
Weights	Operating weight	kg	3900	4030	6040	6160	8610	9810	11840

Dimensions

			281	361	561	721	831	1071	1431
L	STD	mm	5000	5000	7200	7200	8400	10050	11700
W	STD	mm	2200	2200	2200	2200	2200	2200	2200
H	STD	mm	2360	2360	2360	2360	2750	2750	2750

Notes

1 Chilled water (with ethylene glycol at 30%) from 15 to 10 °C, ambient air temperature 35 °C.
2 Seasonal energy efficiency of high temperature process cooling according to EU Regulation No. 2016/2281.
3 Ambient air temperature at wich the cooling capacity indicated in point (1) is reached.
4 Sound pressure level measured in free field conditions at 1 m from the unit. According to ISO 3744.