Construction Features:

●      Compressors

The unit adopts Scroll and Screw Compressors. Screw type compressor is direct male motor/female motor drive, with crankcase heater. Lubrication is ensured by discharge and suction pressure difference. Continuous cooling capacity control is available, enabling to maximize the energy efficiency of the unit in any operating condition; integral electric motor protection and temperature sensors are inserted directly to the windings. Motor starters are delta-star type and are supplied with standard capacity step reduction.

●      Heat Exchangers

Shell and tube type, dry expansion evaporators are insulated with closed-cell foam material for reduced heat loss. All evaporators are incorporated with temperature probe for anti-freeze protection.

●      Refrigerant Circuit

Includes: compressor discharge valves, liquid lines shut-off valve, charging connector, liquid line sight glass, filter drier, thermostatic expansion valve, low pressure control with automatic reset, high reassure control with manual rest, evaporator and condenser water temperature probes for readout by unit control system.

 

●      Electrical Control Panel

The electrical panel consists of

◇     Main switch

◇     Power and auxiliary circuit fused

◇     Compressor contactors

◇     Air pressure switch

◇     Microprocessor for control of the following functions:

 

Water temperature control

Anti-freeze protection

Compressor operation timing

Compressor automatic start-up sequence

Alarm signals

Alarm reset

◇     Digital display of:

Entering and leaving water temperature

Temperature and differential settings

Alarm description

Hour meters readout of operation and number of unit and compressor start-ups

Electrical power-supply[v/f/Hz]:380/3-/50+-10%

●      Control and Safety Devices

◇     manual reset high pressure switch

◇     automatic reset low pressure switch

◇     compressor over temperature protection

●  Test

◇  Unit are factory tested and come with full oil and refrigerant charges.