TWA 281÷1431 TT/H

A CLASS ENERGY EFFICIENCY AIRCOOLED LIQUID CHILLERS WITH AXIAL FANS, TURBOCOR (MAGNETIC LEVITATION) COMPRESSORS AND FLOODED SHELL AND TUBE EXCHANGER

The innovative TWA 281÷1431 TT/H units, with HFO-R1234ze refrigerant, are designed to provide an effective solution to highly selective system needs. 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 use of TURBOCOR dynamic partial-load oil-free magnetic levitation compressors managed by the TURBOSOFT self-adaptive electronic control, of flooded shell and tube evaporator and innovative heat exchangers, traditional or Microchannel, results in a high energy efficiency with unequaled SEER values, with minimum water content, and an excellent silent functioning. Compared to traditional units, equipped with Screw compressors, TURBOLINE units have low operational costs during their entire operating period, even lower than 50%.
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.

Versions

TWA - Cooling only
TWA/MC - Cooling only with MICROCHANNEL coils

Power range

262-1340 kW
75.0-381 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 tube and aluminum finned coils or aluminium MICROCHANNEL 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
TXB Coil with epoxy treatment
EW External water connections
PU Single circulating pump
PD Double circulating pump
FE Antifreeze heater for evaporator
FX Antifreeze heater for evaporator and pipes
FZ Antifreeze heater for evaporator, single pump and pipes
FH Antifreeze heater for evaporator, double pump and pipes
TS Touch Screen Interface
WM Web Monitoring - Wireless remote monitoring (GPRS/EDGE/3G/TCP-IP)
IST Modbus TCP/IP protocol, Ethernet port
ISB BACnet MSTP protocol, RS485 serial interface
ISBT BACnet IP protocol, Ethernet port
ISL LonWorks protocol, FTT-10 serial interface
ISS SNMP protocol, Ethernet port
IAV Remote set-point, 0-10 V signal
IAA Remote set-point, 4-20 mA signal
IAS Remote signal for second set-point activation
IDL Demand limit from digital input
CP Potential free contacts

Loose accessories

MN High and low pressure gauges
CR Remote control panel
RP Coils protection metallic guards
FP Coils protection metallic guards with filter
AG Rubber shock absorbers
AM Spring shock absorbers
FL Flow switch

Technical data

			281	361	561	721	831	1071	1431
Cooling STD version	Cooling capacity (1)	kW	262	335	524	670	777	1000	1340
	Absorbed power (1)	kW	76	94	154	191	228	280	377
	EER (1)		3,45	3,56	3,40	3,51	3,41	3,57	3,55
Cooling STD version (EN14511)	Cooling capacity (1)	kW	261	334	522	668	774	997	1336
	Absorbed power (1)	kW	77	95	156	193	231	283	381
	EER (1)		3,39	3,52	3,35	3,46	3,35	3,52	3,51
	SEER (2)		5,496	5,730	5,520	5,700	5,600	5,880	5,860
	Energy Efficiency (2)	%	217	226	218	225	221	232	232
Cooling MC version	Cooling capacity (1)	kW	262	335	524	670	777	1000	1340
	Absorbed power (1)	kW	72	89	145	181	216	264	356
	EER		3,64	3,76	3,59	3,70	3,60	3,79	3,76
Cooling MC version (EN14511)	Cooling capacity (1)	kW	259	334	518	668	774	997	1336
	Absorbed power (1)	kW	73	90	147	183	219	267	360
	EER (1)		3,55	3,71	3,52	3,65	3,53	3,73	3,71
	SEER (2)		5,55	5,79	5,58	5,76	5,65	5,94	5,93
	Energy Efficiency (2)	%	219	229	220	227	223	235	234
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
Evaporator	Water flow	l/s	12,52	16,01	25,04	32,01	37,12	47,78	64,02
	Water connections	DN	100	100	125	125	150	150	150
	Pressure drops	kPa	40	47	47	50	40	43	32
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	173	339	347	505	520	678
	Max. starting current	A	25	25	191	199	357	372	530
Unit with pump	Pump available static pressure	kPa	140	120	110	125	105	120	145
Unit with pump	Water connections	DN	100	100	150	150	150	150	200
Sound pressure	STD version (3)	dB(A)	70	70	71	71	71	71	72
Sound pressure	MC version (3)	dB(A)	69	69	70	70	70	70	71
Weights	Transport weight	kg	2610	3000	4050	4460	6050	6820	8100
Weights	Operating weight	kg	2670	3070	4150	4580	6210	7010	8400

Dimensions

			281	361	561	721	831	1071	1431
L	STD/MC	mm	4000	5000	6200	7200	8400	10050	11700
W	STD/MC	mm	2200	2200	2200	2200	2200	2200	2200
H	STD/MC	mm	2100	2100	2100	2100	2500	2500	2500

Notes

1 Chilled water from 12 to 7 °C, ambient air temperature 35 °C.
2 Seasonal energy efficiency of cooling at low temperature. According to EU Regulation n. 2016/2281.
3 Sound pressure level measured in free field conditions at 1 m from the unit. According to ISO 3744.
N.B. (1) Data of MC version are specified on technical brochure.