Air Cooled Water Chiller with reciprocating Compressor

Air Cooled Water Chiller with reciprocating Compressor

Petra air cooled liquid chillers (APX) with semi-hermetic reciprocating compressors are available in a wide range of sizes to meet customer requirements for different applications.

Petra APX series offers state of the are low sound, reliability, high energy efficiency and small physical footprint chillers.

Petra APX chillers are equipped with unsurpassed features including a microprocessor controller to manage the unit`s performance for optimum efficiency at both full load and part load values.

  • Wide Range of Capacities: 123 kW (35 Tons) to 1372 kW (390 Tons) @ 50 Hz, 141 kW (40 Tons) to 1618 kW (460 Tons) @ 60 Hz.
  • Optimal Performance.
  • Compact Design.
  • Easy Installation and Maintenance.
  • Welded structural C-channel base painted with mono component catalyzed primer sprayed paint.
  • 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 semi-hermetic reciprocating compressor.
  • Copper tubes aluminum fins air cooled condenser coils.
  • All coils are air pressure tested by dry air up to 2,900 kPa (420 Psi) under water. They also undergo dry cleaning after manufacturing for optimum system cleanness.
  • 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 refrigerant side design pressure of 1,000 kPa (145 Psi) and for a maximum water side working pressure of 1,500 kPa (220 Psi).
  • Independent refrigeration circuit per compressor.
  • Liquid, discharge and suction pipes are all hard copper pipes. They are formed using automated CNC pipe bending machines in order to minimize pipe-brazed joints which in turn increases system reliability.
  • Epoxy paint for all exposed copper piping system of the refrigeration circuit.
  • Components of each refrigeration circuit include thermostatic expansion valve, liquid line solenoid valve, liquid line shut off valve, liquid line moisture indicator sight glass, high safety pressure switch and filter drier.
  • Compressor electronic current monitor and overload protection through controller.
  • Control voltage is 220-240V for all components.
  • Microprocessor controller for full management of chiller operation and safety circuits.
  • Nema 3X with IP54 minimum enclosure standard electrical panel. Two separate panels, one for power & the other for control.
  • Copper tubes copper fins coil.
  • Coil corrosion protection including polyurethane pre-coating (for aluminum fins) and polyurethane post-coating (for aluminum & copper fins).
  • Sound reduction options including low rpm condenser fan & compressor jacket.
  • coil guard placed on the lower part of the unit all over the perimeter to provide protection for unit components, fabricated from gauge 18 [1.25 mm (0.05 inch)] galvanized steel sheet metal & painted with Petra electrostatic powder paint, fitted in place by spring load quick turn latch and is supported upon opening by stainless steel hinges.
  • Hot gas bypass consists of a mechanical valve capacity regulator used to adapt compressor capacity to actual evaporator load, installed in a bypass line between the high and low pressure sides of the refrigeration system and is designed for hot gas injection into the evaporator just after the expansion valve.
  • Pressure gauges for monitoring of refrigeration discharge and suction pressure.
  • Pressure relief valve set to open at a predetermined set pressure to protect pressure vessels and other equipment from being subjected to pressures that exceed their design limits.
  • Water flow switch installed to prevent operation of unit without evaporator water flow
  • Cooler cladding of aluminum, stainless steel or painted galvanized steel {made from gauge 22 [0.7 mm (0.03 inch)}.
  • Cooler can be insulated with closed cell foam insulation of 25 mm (1 inch), 38 mm (1.5 inch) & 50 mm (2 inch) The insulation density is 48 kg/m3 (3 lb/ft3) with a K-factor of 0.035 W/(m.°K) [0.0203 BTUH/(ft.°F).
  • Main disconnect switch used to de-energize the power supply to the chiller during servicing or repairing works because of the door interlock with an external handle that is installed on the electric panel door.
  • Power factor correction used to improve the power factor level which improves system reliability, minimizes voltage drops and gives better power quality.
  • Earth leakage relay used in electrical installations with high earth impedance to prevent shock.
  • Control transformer to supply power input to auxiliary components at 120 or 220 volts, such as (not limited to) bulk head light and GFI outlet.
  • IP 54 protection, class I electric safety bulk head light.
  • Ampere-meter & volt-meter used to measure the power current & voltage consumption Ampere-meter is used for each phase.
  • 120 volt power supply connected through the transformer to provide a 120 volt single phase circuit that is used to operate the electric appliances at site such as laptops, tablets and cell phones.
  • Speed regulator for condenser fan motors used to permit the unit to operate in low ambient temperature.
  • Dual power connection, one power entry for compressors & the second for the rest of the unit.
  • External over load for each compressor.
  • External over load for each condenser fan motor.
  • Circuit breaker for each condenser fan motor.
  • Nema 4x electrical panels made from galvanized steel.
  • Nema 4x electrical panels made from stainless steel.
  • Cooler tape heater protection down to 0°C (32°F), -18°C (0°F) & -29°C (-20°F).
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