Product Features
Compact & Rigid Casing Architecture
Engineered with a high-strength body structure rated for working pressures up to 28 bar, this semi-hermetic compressor features optimized internal flow channels that reduce gas pressure drop and flow turbulence. The compact casing integrates the suction filter, shut-off valves, and temperature sensors into a single streamlined unit, minimizing overall physical dimensions and saving valuable footprint inside equipment skids.
Solenoid-Driven Capacity Regulation (100% / 50%)
Equipped with a solenoid-controlled energy modulation system, this semi-hermetic compressor provides flexible 100% and 50% output steps. By adjusting compressor displacement directly to varying thermal loads, the system avoids frequent motor restarts, maintains stable suction pressure, and optimizes power efficiency during partial-load conditions.
Outer-Accessible High-Density Suction Filter
To safeguard internal cylinder valves and moving mechanical parts from debris, the unit incorporates an outer-accessible high-density suction filter screen. Mounted on the exterior end casing, the filter element can be easily inspected, cleaned, or replaced during routine servicing without disconnecting suction pipe lines.
Internal High-to-Low Pressure Safety Relief Valve
Designed for operational safety under extreme working conditions, the semi-hermetic compressor features an internal pressure relief valve that automatically connects the high-pressure discharge port to the suction casing during overpressure events. This internal pressure equalization prevents structural casing stress and provides reliable, self-resetting system protection.
Company Introduction
Coolstart is a modern, large-scale refrigeration enterprise with over 20 years of industry experience. We specialize in supplying semi-hermetic compressors, scroll compressors, screw compressors, reciprocating compressors, rotary compressors, cold storage equipment, quick-freezing systems, and ice-making machinery. Supporting full-category OEM and ODM customization, Coolstart delivers reliable refrigeration products to clients across the United States, Russia, the United Kingdom, the United Arab Emirates, Saudi Arabia, and other global markets through technical innovation and dedicated service.
Frequently Asked Questions
Q1: Why is the 54 mm (2-1/8") suction line dimension critical for high-displacement compressors like the SP4L2500?
A1: The 54 mm suction diameter ensures minimal vapor velocity loss across high displacement rates, maintaining volumetric efficiency and preventing starvation at the suction manifold.
Q2: How does the PW starter selection manage starting currents on 25 HP power lines?
A2: Part-Winding starting reduces peak inrush current to 123A, significantly lowering electrical voltage drops across local supply networks.
Q3: What oil separation requirements are recommended for large 102.9 m³/h systems?
A3: Due to the high volumetric gas flow, installing an efficient oil separator on the discharge line is recommended to ensure rapid oil return to the 3.7 dm³ crankcase sump.
Q4: How does Coolstart protect heavy 220 kg compressors during international freight transport?
A4: Each 220 kg unit is securely bolted onto reinforced wooden pallets and enclosed in heavy-duty export crates with internal moisture protection and dry holding gas charges.
Q5: Can Coolstart provide custom voltage configurations for 60Hz industrial grids?
A5: Yes, in addition to standard 460V/3Ph/60Hz PW options, custom motor windings for regional industrial grid voltages can be produced upon request.
