Semi-Hermetic Single-Stage Reciprocating Refrigeration Compressor Unit

Each Semi-Hermetic Single-Stage Reciprocating Refrigeration Compressor Unit is manufactured in China, meeting the highest international quality standards. It integrates the compressor, high-efficiency oil separator, receiver-and-dryer, filter dryer, solenoid valves, safety controls, and a complete PLC control panel onto a factory-assembled and operationally tested skid-mounted base. This design avoids on-site assembly errors and significantly reduces on-site commissioning time.

The semi-hermetic construction encloses the motor within the refrigerant circuit, eliminating the shaft seal — the most common source of refrigerant leakage in open-type reciprocating compressors. The result is a cleaner, longer-lasting system that requires fewer service interventions over its operational life. Every compressor motor is cooled directly by suction gas, removing the need for external cooling fans and reducing auxiliary power consumption.

Lynxcool's reciprocating compressor units are manufactured in China and exported to over 40 countries, renowned for their durability, ease of maintenance, and competitive total cost of ownership. Standard refrigerants: R134a, R404A, R507A, R22 (modified from older models), R448A, and R449A.

Key Capabilities

•Semi-hermetic sealed motor — shaft-seal-free design; motor cooled by suction gas; significantly lower refrigerant leak rates versus open-type reciprocating compressors.

•Single-stage compression — simple, robust piston-cylinder mechanism; proven reliability in continuous operation over decades of field service.

•Broad operating range — evaporation temperatures from +10 °C to −40 °C; condensing temperatures up to +55 °C; suitable for medium- and low-temperature applications.

•Cylinder unloading capacity control — 25%, 50%, 75%, and 100% capacity steps via solenoid-controlled cylinder unloaders; reduces start-up current and adapts to varying load.

•Factory skid package — compressor, oil separator, receiver, filter-drier, controls, and instrumentation factory-mounted and run-tested as a single unit before leaving our China production facility.

•Wide refrigerant compatibility — supports HFC, HFO blend, and legacy HCFC refrigerants; field-configurable for different refrigerant charges.

Technical Parameters

Each Semi-Hermetic Single-Stage Reciprocating Refrigeration Compressor Unit is manufactured and run-tested in China, with factory test reports, CE declaration of conformity, and GB/T compliance certificates provided as standard documentation with every shipment.

Application Scope

Supermarket & Food Retail  |  −5 °C to −25 °C

Remote condensing units, multi-deck display cases, and walk-in cooler and freezer systems. The compact footprint and low noise level of units produced in China by Lynxcool make them well suited for installation in or adjacent to retail environments. Cylinder unloading reduces energy consumption during off-peak hours.

Cold Storage & Warehousing  |  −18 °C to −35 °C

Medium and large cold stores for frozen food, dairy, and perishable goods. Lynxcool reciprocating units made in China are designed for continuous 24/7 operation. Multiple units can be installed in parallel rack configurations to achieve the required total capacity with built-in redundancy.

Food Service & Hospitality  |  0 °C to −20 °C

Walk-in coolers, blast chillers, ice machines, and centralized kitchen refrigeration for hotels, restaurants, and catering facilities. The semi-hermetic design minimizes refrigerant leakage in occupied buildings, supporting compliance with F-Gas regulations and ASHRAE 15 safety requirements.

Light Industrial Process Cooling  |  −10 °C to −40 °C

Cooling of industrial processes including plastic injection molding, printing, laser cutting, and electroplating bath temperature control. Produced in China to international quality standards, these units are built for demanding continuous-duty industrial environments.

Transport & Refrigerated Vehicles  |  −18 °C to −25 °C

Stand-alone condensing units for refrigerated trucks, trailers, and shipping containers where compact size, vibration resistance, and reliable starting across a wide ambient temperature range are required. Units are available in configurations suitable for diesel engine drive or shore-power operation.

Core Technical Features

01 — Semi-Hermetic Motor Enclosure

The compressor motor is enclosed within the refrigerant circuit and is directly cooled by the returning suction gas. This design eliminates the mechanical shaft seals commonly found in open reciprocating compressors. The Semi-Hermetic Single-Stage Reciprocating Refrigeration Compressor Unit has a near-zero average shaft seal-related leakage rate over its service life, which helps reduce F-Gas compliance costs for end users and decreases the frequency of refrigerant replenishment.

02 — Multi-Cylinder Reciprocating Mechanism

The piston-and-cylinder reciprocating mechanism is one of the most mechanically proven compressor technologies in existence, with decades of field data across millions of operating hours. Available in 2-, 4-, 6-, and 8-cylinder configurations, the reciprocating design tolerates liquid slugging better than screw compressors, making it more forgiving in systems where refrigerant flood-back is a risk. All compressor internals are manufactured and assembled in China to tight dimensional tolerances and inspected against GB/T 19409 before leaving the factory.

03 — Cylinder Unloading Capacity Control

Solenoid-actuated cylinder unloaders allow capacity to be stepped between 25%, 50%, 75%, and 100% of rated output. Unloading also reduces the motor start-up current, allowing direct-on-line starting without a soft-starter in many configurations — lowering the electrical installation cost. The PLC manages the unloading sequence automatically based on suction pressure, maintaining stable evaporation temperature across the load range. This feature has been standard on every unit produced in China by Lynxcool since our founding.

04 — Crankcase Heater and Liquid Flood-Back Protection

A factory-fitted crankcase heater prevents refrigerant migration into the oil during off cycles, ensuring the correct oil viscosity is available for lubrication at start-up. The PLC enforces a minimum crankcase heating time before allowing the compressor to start after a prolonged shutdown. Combined with the suction accumulator included as standard on low-temperature configurations, these measures protect the compressor against liquid slugging — the most common cause of catastrophic reciprocating compressor failure.

05 — Force-Feed Lubrication with Differential Pressure Monitoring

An internal gear-type oil pump delivers pressurized oil to all bearing surfaces from the moment the crankshaft begins to rotate. An oil pressure differential switch is wired into the safety circuit: if oil pressure fails to build within 90 seconds of start-up, or drops below the setpoint during operation, the compressor is immediately shut down and an alarm is raised. This protection is standard on every unit manufactured in China by Lynxcool and cannot be bypassed by the operator.

06 — Factory Skid Assembly and Pre-Shipment Run Test

Every component is factory-mounted on an epoxy-coated structural steel base frame, fully piped in copper or steel, and wired to a terminal strip at our China production facility. Before dispatch, each unit undergoes a complete run test: pressure leak check, electrical insulation test, safety interlock verification, and a minimum 4-hour operational run at rated conditions with recorded suction pressure, discharge pressure, oil pressure, and motor current. Test certificates are issued for every unit shipped from China.

Why Partner with Lynxcool?

Proven Manufacturing Heritage

Lynxcool has been designing and manufacturing refrigeration equipment in China for over 20 years. Our semi-hermetic reciprocating units are among our most mature product lines, with a continuous production history that has delivered more than 2,000 units produced in China to customers across Asia-Pacific, the Middle East, Europe, and the Americas. This volume of field experience informs every design refinement we make.

Dedicated Application Engineering

Our engineering team based in China supports customers through the full specification process: heat load review, compressor selection, refrigerant choice, electrical design, and control strategy definition. We produce selection reports, equipment schedules, and P&ID drawings as part of the standard order process — not as a paid add-on service.

ISO 9001 Manufacturing and 100% Factory Testing

Our China production facility operates under ISO 9001 quality management. Every reciprocating compressor unit manufactured in China by Lynxcool is subject to 100% factory acceptance testing before dispatch. No unit leaves our facility without a passed test record. This commitment eliminates the most common cause of commissioning delays: equipment defects discovered on-site.

Globally Serviceable Components

Core compressors are sourced from Bitzer, Embraco, or Dorin — brands with global service networks and spare parts availability. All electrical components are from Siemens, Schneider, or Delta. Instrumentation from Danfoss or Emerson. Because these components are produced and stocked globally, customers in any market can source spare parts locally without depending on Lynxcool as the sole supply chain — a significant advantage over proprietary-component designs.

Competitive China-Origin Pricing with International Quality

Being manufactured in China allows Lynxcool to offer internationally certified, application-engineered refrigeration equipment at a price point that is typically 20–35% below equivalent European-manufactured alternatives. Our China production costs are passed directly to customers — not absorbed as margin — because we compete on total value delivered, not on brand premium alone.

Certifications & Compliance

•ISO 9001 — Quality Management System, China production facility

•CE Marking — European Conformity (Machinery Directive & PED 2014/68/EU)

•ASHRAE 15 — Safety Standard for Refrigeration Systems

•GB/T 19409 — China National Standard for Refrigerating Compressors

•F-Gas Regulation Compliant — Supports EU 517/2014 and successor regulations

•UL / ETL Option — Available for North American market requirements

Track Record

•2,000+ semi-hermetic reciprocating units produced in China and installed globally

•Exported to over 40 countries across 6 continents

•98% on-time delivery from our China production facility

•Average MTBF exceeding 50,000 operating hours in commercial refrigeration duty

•48-hour spare parts response to major global markets

•Up to 5-year extended warranty available

Frequently Asked Questions

Q: Why choose a reciprocating compressor over a screw compressor for my application?

A: Reciprocating compressors excel at small-to-medium capacities where screw compressors are oversized and inefficient. They tolerate occasional liquid flood-back better than screws, making them more forgiving in less-than-perfect system designs. They are also easier and less expensive to service in the field, with no need for specialist tooling or proprietary oil. For capacities below 150 kW and evaporation temperatures above −35 °C, reciprocating compressors typically offer the best combination of first cost, reliability, and serviceability.

Q: Can the Semi-Hermetic Single-Stage Reciprocating Refrigeration Compressor Unit be rewound or repaired in the field?

A: Yes. The bolted end covers of a semi-hermetic compressor allow field access to the motor windings and bearings. Motor rewinds, bearing replacements, valve plate servicing, and connecting rod replacement can all be performed by a trained refrigeration engineer without returning the unit to the factory. This is a significant advantage over fully hermetic compressors, which must be replaced as a complete assembly when the motor fails.

Q: What refrigerants can this unit use, and is R22 supported?

A: Standard configurations support R134a, R404A, R507A, R448A, and R449A. R22 legacy configurations are available specifically for retrofit projects where existing system infrastructure must be preserved. The compressor internals, valve materials, and oil type are all matched to the specified refrigerant at our China factory before dispatch. Switching refrigerants after commissioning requires an engineering review — contact our team before making any refrigerant change.

Q: How does cylinder unloading work, and does it save energy?

A: Cylinder unloaders are solenoid-actuated devices that hold the suction valves of selected cylinders open during the compression stroke, preventing those cylinders from doing work. At 50% unloading, for example, half the cylinders are disabled and the compressor delivers approximately half the rated capacity while consuming roughly 55–60% of full-load power — a meaningful energy saving under part-load conditions. The PLC manages the unloading sequence automatically, switching between capacity steps based on suction pressure.

Q: Where are these units manufactured, and what quality assurance is in place?

A: Every unit in this product line is designed and manufactured in China at our ISO 9001-certified Lynxcool production facility. We are proud of our Made in China heritage and back it with rigorous quality assurance: incoming component inspection, in-process assembly checks, 100% factory run-testing, and full documentation including test certificates, CE declaration of conformity, and GB/T compliance records shipped with every unit produced in China.

Q: What is the expected service life, and what maintenance does the unit require?

A: Under normal commercial refrigeration duty, a semi-hermetic reciprocating compressor unit produced in China by Lynxcool has an expected operational life of 15–25 years with appropriate maintenance. Recommended maintenance intervals: oil and filter change every 10,000 operating hours, valve plate inspection every 20,000 hours, motor winding insulation test annually. Full overhaul at 40,000–50,000 hours depending on operating conditions. Our service documentation provides detailed maintenance schedules and procedures.

Q: What is the lead time from order to delivery?

A: Standard configurations from our China production facility: 6–10 weeks from order confirmation to factory dispatch. Custom configurations or non-standard voltage/refrigerant options: 10–14 weeks. On-site installation of the skid-mounted unit takes 1–2 days. Commissioning including refrigerant charging, PLC verification, safety checks, and operator training requires 1 day for standard configurations with a Lynxcool engineer on-site.

READY TO SPECIFY YOUR SYSTEM?

Contact our engineering team for a custom proposal based on your operating conditions.

Proudly Made in China and Produced in China · ISO 9001 · CE Certified