Air cooled water chillers in Freecooling mode with axial fans. Range with semi-hermetic screw compressors and R134a refrigerant gas.
Construction features
• Compressor: high energy efficiency semi-hermetic screw compressor, with star-delta limited start and complete with integral protection, casing heater and refrigerant gas outlet piping shut-off valve.
• 2 circuits/ 6 capacity steps.
• Water side heat exchanger: counterflow dry expansion shell and tube type, complete with: differential pressure switch, air vent valve, water drain cock, closed cell polyurethane foam rubber insulation with protection film against UVA rays. Victaulic connections.
• Air side heat exchanger: consisting of coil made of copper pipes and aluminium fins divided into two sections: one dedicated to the condensation of the refrigerant gas and one dedicated to cooling the water in free-cooling mode.
• 3-way modulating valve to divert the water flow from the system towards the free-cooling coil or directly towards the evaporator.
• Fan: external rotor axial type electric fans, equipped with internal thermal protection, accident protection grilles and a proportional electronic device for pressurised and continuous fan rotation speed regulation up to an outdoor air temperature of -15°C.
• Control: electronic microprocessor control prepared for the connection with the main BMS available on the market (MODBUS RTU, LON, BacNet).
• Structure: load-bearing structure made of galvanised and painted steel plate with polyester powder coating. The unit is also complete with:
– display of cooling circuit high and low pressure;
– clock board
Versions
• B – High efficiency standard version (TFAVBZ).
• I -Soundproofed version with soundproofing lining on the compressor compartment (TFAVIZ).
• S – Silenced version with soundproofing lining on the compressor compartment and reduced speed fans (TFAVSZ).
Models
• TFAVBZ: high efficiency base unit in Freecooling mode.
• TFAVIZ: soundproofed unit in Freecooling mode.
• TFAVSZ: silenced unit in Freecooling mode.
Factory fitted accessories
• Condensing control -20°C with fans with EC motor.
• Power factor correction capacitors (cosφ > 0.94).
• Compressor and fan circuit breaker switches.
• Forced limit of power consumption.
• Inlet compressor shut-off valves.
• Low and high pressure gauges for each cooling circuit.
• Bottom compartment protection nets.
• Coil protection nets.
• Coil protection metal filter.
• Compressors with linear capacity control (25-100 %).
• Evaporator antifreeze heater.
• Digital input for double set-point.
• Low water temperature.
• Double high pressure safety valve with exchange valve.
• Stainless steel cooling circuit.
• Electrical panel heater.
• Soft starter.
• Compressor oil level sensor.
• Control of min/max power supply voltage.
• 4-20 mA analogue signal for shifting set-point.
• Pre-painted copper/coils or copper/copper coils.
• Interfaces for serial communication with other devices.
• Spring anti-vibration mounts.
Separately supplied accessories
• Remote keypad with display.
• Rhoss supervisors for unit monitoring and remote management.
