The control solution for chillers with frequency-controlled compressors has been developed around a programmable controller based on a high-speed microprocessor and powerful yet flexible software adopting stepwise capacity control. The software dynamically controls operating limits by continuous reading suction pressure, discharge pressure, and other operating parameters to maintain the chiller’s working point, ensuring maximum chiller protection, reliability, and efficiency.
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.
Customers may choose from two performance grades, standard and high efficiency with enlarged condensers, and from three noise reduction packages. Special kits for low- or high-ambient operation adapts chillers to environmental conditions existing at the installation site. Lightstream Screw II Inverter chillers can also be factory-fitted with:
- Hydronic kits comprising of single or twin pumps, equipped with variable or fixed-speed drives, bundled with ancillaries
- Free cooling system w/ bypass and regulating valves
- Corrosion protection for condenser coils
- 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.