CONTROLS AND SOFTWARE
The control system is based on a high-speed controller equipped with the latest microprocessor. The control software has been developed with a focus on energy-efficient operation for Turbocor-based, multi-compressor air-cooled chillers. To achieve the best possible efficiency for multi-compressor chillers, compressor management software constantly monitors the actual cooling demand and selects the most efficient combination of the compressors. The software regulates optimum rotation speed, compression ratio, and positions the inlet guide vanes and controls bypass valves.
Giving complete control over the system for the plant operator, the chiller software manages and optimizes the chiller’s performance according to cooling demand and ambient conditions, generates safety and security alarms, supports interlinked, coordinated operation of multiple units, provides diagnostics and run statistics, and allow easy integration with any BMS protocols.
Being feature-rich in standard, Lightstream Turbo II is highly configurable for different customer requirements and facility layout needs – thanks to numerous available accessories and options. The chillers are available in three grades of noise elimination, can be configured with low- or high-ambient kits, and charged with refrigerants R134a, R513a, R515b, or ultralow-GWP refrigerant R1234ze. Optional components also include:
- Hydronic kit with single or twin pumps, equipped with variable or fixed-speed drives
- Free cooling system w/ bypass and regulating valves
- Single or dual refrigeration circuit
- Refrigerant leak detectors
- Control and connectivity options
- Dual power input and redundancy options
- Accessories for servicing
INTEGRATED FREE COOLING
Free cooling version provides low energy cooling and enables significant savings at low-ambient conditions. In mild temperature conditions, when the ambient temperature drops below the return water temperature, the free cooling system operates in parallel with mechanical cooling, maximizing energy savings. Through the use of microchannel cooling coils, the air temperature at which the free cooling system provides 100% cooling demand is higher by 3°C to 5°C compared to heat exchangers of other types. The flow through the cooling coils is controlled through a 3-way mixing valve managed by the chiller software.