TWA 212÷682 S/K/P/AF

A CLASS energy efficiency aircooled liquid Chillers and Heat Pumps with axial fans, Scroll compressors and plate exchanger

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The TWA 212÷682 S/K/P/AF liquid Chillers and Heat Pumps are characterized by A CLASS energy efficiency.
The units are characterized by multi-compressor design on double cooling circuit, to reach high energy performances, reduction of current at start-up, elimination of inertial tanks and excellent silent functioning. The use of components built in large series makes them highly reliable and the management of a high number of compressors allows increased life span with reduction of machine stopping risks and easier maintenance operations.
Are available as option the new EC Inverter fans with high available static pressure and efficiency.
The Heat Pump versions are designed for hot water production up to 55°C.
The units are compliant to the ErP Regulation.

On request, units can be supplied with R452B or R454B refrigerant.

Versions

TWA - Cooling only
TWA/WP - Reversible Heat Pump
TWA/SSL - Super silenced cooling only

Power range

197-692 kW
56,0-197 Ton

Features

Structure with supporting frame, made of galvanised sheet metal with additional protection provided by polyester powder coating.
Scroll compressors with oil sight glass, internal overheat protection and crankcase heater.
Axial fans directly coupled to an electric motor with external rotor.
Condenser made of copper tubes and aluminium finned coils.
Evaporator AISI 316 stainless steel braze welded plates type with two independent circuits on the refrigerant side and one on the water side, complete with water differential pressure switch. On the Heat Pump units it is always installed an antifreeze heater.
Cooling circuit shut-off valve on liquid line in 302÷682 models.
Electronic expansion valve.
Electronic high and low pressure gauges.
R410A refrigerant. On request R452B or R454B refrigerant.
Electrical board includes: main switch with door safety interlock, fuses or magnetothermic switches, thermal protection relays for compressors and thermocontacts for fans.
Functioning in heating mode with outside air temperature down to -15 °C.
Microprocessor control and regulation system.

Accessories

Factory fitted accessories

IM Automatic circuit breakers
SL Unit silencement
RFM Cooling circuit shut-off valve on discharge line
CT Condensing control down to 0 °C
CC Condensing control down to -20 °C
BT Low water temperature kit
EC EC Inverter fans
ECH EC Inverter fans with high available static pressure
DS Desuperheater
RT Total heat recovery
TX Coil with pre-coated fins
EW External water connections
PS Single circulating pump
PSI Inverter single circulating pump
PD Double circulating pump
PDI Inverter double circulating pump
GS Single circulating pump gasket for glycol >30%
GD Double circulating pump gaskets for glycol >30%
FN Antifreeze heater for pipes
FG Antifreeze heater for single pump and pipes
FM Antifreeze heater for double pump and pipes
SS Soft start
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
MN High and low pressure gauges

Loose accessories

CR Remote control panel
RP Coils protection metallic guards
FP Coils protection metallic guards with filter
AG Rubber shock absorbers
AM Spring shock absorbers