Modular Screw Air to water Heat Pump – LSB Series

LSB Series is the latest generation Gree air to water screw chiller unit ideal for large scale commercial and industrial applications. It comes with the latest technology screw compressors for big capacity and high energy efficiency. It comes in a wide range as well as modular installation capability of up to 8 single modules of 230, 350 and 430 kW, in various combinations of up to 3.440 kW in total, utilizing eco friendly R134a.

High efficiency Full Load Operation – Eurovent certified

Utilizing new screw compressor technology, the chillers exceed the performance requirements of ASHRAE 90.1. All system components are selected for optimum performance, including the condenser coil areas and evaporator sizes.

By using a compressor on each chiller, unloading characteristics and part load performance value (IPLV indicator as outlined in Standard ARI 550/590-1998) are outstanding. Capacity data is certified by Eurovent.

Compact Design - Quiet Operation

The chillers have a reputation for a compact design and small footprint, designed with quiet screw compressors. Fans are selected for good performance and lower sound levels. The attention to detail with sound is critical in the design. Small issues such as refrigerant piping, supports for piping, securing components to the structure are all important to making a quiet product. We proudly publish our sound performance.

Superior Controls

GREE has provided the latest technology in control. The new controller provides a user friendly environment to the operator. The control logic is designed to provide maximum efficiency, to help provide continuing operation in unusual operating conditions through proactive controls, and to provide a history of conditions to aid in problem resolutions. Perhaps the greatest benefit is Protocol for integrating with your building automation system (BAS). The interface with the BAS standard protocols through Modbus.

Evaporator

The evaporator is direct expansion, shell-and-tube type with water flowing in the baffled shell side and refrigerant flowing through the tubes. The evaporator has a carbon steel fin and seamless high efficiency copper tubes roller expanded into a carbon steel tube sheet.

Refrigerant heads are carbon steel with multi-pass baffles to provide oil return and are removable to permit access to the tubes from either end. For water removal, 10mm vent and drain plugs are provided on the top and bottom of the shell. An ambient air thermostat controls the heater cable. The fitted and glued in place insulation has a K factor of 0.28. The refrigerant side maximum operating pressure is 2068 kPa. The water side operating pressure is 1048 kPa. Each evaporator is designed, constructed, inspected, and stamped according to the requirements of the ASME Boiler and Pressure Vessel Code.

Condenser

Condenser coils have internally enhanced seamless copper tubes arranged in a staggered row pattern. The coils are mechanically expanded into louver aluminum fins with full fin collars. Golden Fin is available for corrosive atmospheres, fitted with a protective wire mesh guard. Condenser fans are composed of corrosion resistant aluminum hub and glass-fiber reinforced polypropylene composite blades molded into a low noise airfoil section. They are designed for maximum efficiency and are statically and dynamically balanced for vibration-free operation. They are directly driven by independent motors, and positioned for vertical air discharge. The fan guards are constructed of heavy-gauge, rust-resistant, coated steel. Motors-The fan motors are totally enclosed air-over, squirrel-cage type, current protected. They feature ball bearings that are double-sealed and permanently lubricated

Microprocessor Controller

The chiller's Unit Control Module is an innovative, modular microprocessor control design. It coordinates the actions of the chiller in an efficient manner and provides stand-alone operation of the unit. A Human Interface Panel is a standard component of the Chiller. Access to all unit controls is via the Human Interface Panel.

Compressor

Suction gas cooled semi-hermetic compact twin screw compressors with high efficiency profile. Compressors are provided with high efficiency suction strainer, oil trainer crank case heater and built in safety pressure relief valve. Moreover, they come with intelligent electronics including motor temperature monitoring, phase sequence monitoring, manual reset lockout and discharge temperature protection by PTC`s sensors. Optimized oil management ensures minimum refrigerant dilution in oil.