Air Cooled Smart Chiller with Scroll Compressor-PSC

PETRA’s Air-Cooled Smart chillers (PSC) with hermetic scroll compressors with R410a / R407c refrigerants offer a wide range of sizes to meet customer requirements for different applications.

PETRA’s Smart chillers are designed to meet customer requirements by offering state-of-the-art low sound, reliability, high energy efficiency, and small physical footprints. The wide range of cooling capacities and flexible installation arrangement make them easy to install and maintain.

PETRA’s Smart Chillers (PSC) are designed to be shipped as a complete factory package which is 100% test run in the factory. Unit capacities in this series range from 151 kW (43 Tons) to 1,343 kW (382 Tons) at 50Hz and from 179 kW (51 Tons) to 1565 kW (445 Tons) nominal tons at 60Hz with refrigerant R410a and from 144 kW (41 Tons) to 1,322 kW (367 Tons) at 50Hz and from 162 kW (46 Tons) to 1523 kW (433 Tons) nominal tons at 60Hz with refrigerant R407c. A wide choice of chiller capacities and options are available to meet most design requirements.

PETRA’s Smart Chillers PSC consists of highly efficient low-pressure drop coolers and high-quality condenser coils with maximized airflow. Condenser coils are equipped with low noise fans with patented design fan and motor mounting.

PETRA’s Smart Chillers are equipped with an intelligent microprocessor controller to manage the unit’s performance for optimum efficiency at both full load and part load values.

Standard Options

-Welded structural C-channel base painted with mono component catalyzed primer sprayed paint.

-The base is equipped with welded brackets for heavy-duty lifting lugs.

-Structural members are made from gauge 15 [1.8 mm (0.07 inch)] tubular cross members that are semi-welded with stainless steel fasteners. All members & panels (side & roof) are painted with oven-baked polyester electrostatic powder paint.

-High-performance hermetic scroll compressor.

-Condenser coils are microchannel type (MCHE) or copper tubes copper aluminum type.

-All coils are air pressure tested by dry air up to 2,900 kPa (420 Psi) underwater. They also undergo dry cleaning after manufacturing for optimum system cleanness.

-Condenser coils are covered with protective panels, to ensure uniform air distribution across the coil face area & provide additional protection for the coil from weather elements.

-Condenser fans of the external rotor type with many attractive features such as space-saving, compact design, optimum cooling, full speed controllability, and low starting currents.

-High-efficiency direct expansion (DX) shell and tube type coolers with inner grooved tubes to optimize the cooler’s efficiency.

-Coolers are tested and stamped for a refrigerant side design pressure of 1,000 kPa (145 Psi) and a maximum water side working pressure of 1,500 kPa (220 Psi).

-Liquid, discharge, and suction pipes are all hard copper pipes. They are formed using automated CNC pipe bending machines to minimize pipe-brazed joints which in turn increases system reliability.

-Epoxy Paint for all exposed copper piping systems of the refrigeration circuit.

-Components of each refrigeration circuit include liquid line solenoid valve, liquid line shut off valve, liquid line moisture indicator sight glass, high safety pressure switch, and replaceable core type filter.

-The unit is a fully charged unit with R410a/R407c refrigerant.

-Electronic expansion valve: Electronically Operated Step Motor flow control valves, intended for the precise control of liquid refrigerant flow. Synchronized signals to the motor provide discrete angular movement, which translates into precise linear positioning of the valve piston. Easily interfaced with microprocessor-based controllers.

-Compressor electronic current monitor and overload protection through the controller

-Free terminal for remote ON/OFF connection.

-Free terminal for general alarm output.

-Control voltage is 220-240V for all components.

-Single point power connection for each electrical panel.

-Circuit breaker for each compressor.

-Starting contactors for compressors and condenser fan motors.

-ON/OFF switch for each compressor.

-Control circuit breaker for short circuit protection.

-Short cycling protection for compressors (time delay).

-Control transformer mounted & wired that shall supply all unit control voltage from main unit power supply to internal components such as (not limited to) solenoid valves, compressor motor protector, compressor crankcase heater, and microprocessor controller.

-Microprocessor controller for full management of chiller operation and safety circuits.

-A power supply monitor (phase failure relay) is used to protect the power circuit against over or under voltage conditions and against phase loss or loss reversing conditions.

-NEMA 3X with IP54 minimum enclosure standard electrical panel. Two separate panels, one for power & the other for control.

-Separate electrical box for condenser fan motors located on the condenser side.