Compressor is an efficient and reliable scroll compressor suitable for various refrigeration and air conditioning applications. Product Features
Efficiency: The ZB21KQE compressor does not have suction and exhaust valves, so it has higher efficiency, stronger reliability, and lower noise.
Low vibration: Due to the simultaneous and continuous suction, compression, and exhaust processes, the pressure rise is slow, the torque change amplitude is small, and the vibration is small.
Wide applicability: Suitable for medium and high temperature applications, such as cold storage, vegetable refrigeration, beverage refrigeration, plastic forming, grain drying, process refrigeration, fresh flower preservation, dairy product production, and food preparation areas
Product Description for ZB21KQEProduct Name:Semi-Hermetic Piston Compressor Product Series:K Series, High-Efficiency Model Core Overview The ZB21KQE is a compact and efficient medium-to-small-sized semi-hermetic piston refrigeration compressor company COPELAND. As part of the classic K series, it inherits the robustness and durability of the series, while the "E" suffix in the model number signifies its high-efficiency and energy-saving characteristics. This compressor is an ideal choice for small and medium-sized commercial refrigeration systems, offering an excellent balance between reliability, energy efficiency, and cost. Main Technical Parameters (Typical values, depend on refrigerant and operating conditions)
Medium/Low Temperature (Evaporation temp. approx. -35°C to +10°C)
Note:The above parameters are typical values. Specific refrigeration capacity, power input, and current vary significantly with changes in evaporation temperature, condensation temperature, and selected refrigerant. Precise data must be obtained from Bitzer's official selection software or technical manuals. Features and Characteristics
High Efficiency and Energy Saving:Utilizes an optimized high-efficiency motor and valve plate system, effectively improving the compressor's Coefficient of Performance (COP) and helping to reduce long-term operational energy consumption.
Compact and Robust Construction:Despite its smaller displacement, it features a high-strength cast iron body and precision-manufactured moving parts, ensuring long service life and stability under continuous operation.
Good Part-Load Performance:Maintains good operational efficiency even during system load variations, adapting to practical application needs.
Reliable Motor Protection:Motor windings are equipped with embedded PTC thermistors, providing direct overheating protection and preventing motor damage under abnormal conditions.
Easy Maintenance:
Cleanable Suction Filter Screen:Prevents contaminants from the system from entering the cylinders, extending compressor life.
Sight Glass:Allows for easy inspection of lubricating oil level and cleanliness.
Standard Crankcase Heater:Reduces refrigerant migration into the oil during shutdown, preventing liquid slugging at startup.
Application Flexibility:Compatible with a wide range of common refrigerants, suitable for a broad spectrum of applications from medium-temperature refrigeration to low-temperature freezing.
Smooth Operation:Precision dynamic balancing ensures low vibration and noise levels during operation.
Primary Application Fields The ZB21KQE is widely used in applications requiring reliable and compact refrigeration solutions, including:
Commercial Display Cases:Refrigerated beverage coolers, deli counters, and ice cream freezers for convenience stores and small supermarkets.
Small Cold Storage Rooms:Small refrigerated and frozen storage rooms used in restaurant kitchens, hotels, and laboratories.
Environmental Test Chambers:Serves as the refrigeration core for small constant temperature and humidity chambers.
Model Number Explanation
ZB:Standard series and design code.
21:Indicates the compressor's displacement class. A lower number compared to, for instance, the ZB26KQE, signifies a smaller displacement.
K:Stands for Bitzer's "K-series" of semi-hermetic piston compressors.
Q:Typically denotes the standard configuration.
E:Stands for "Energy Efficient," the high-efficiency version of the standard model.
Selection and Usage Considerations
Selection Based on Operating Conditions:Selection must not be based on model number alone. Precise selection using official software is mandatory, considering the system's design evaporation temperature, condensation temperature, and ambient temperature.
Refrigerant and Oil Compatibility:Use only the refrigerants and corresponding lubricants specified in the technical manual.
Electrical Safety:Ensure power supply parameters match the compressor nameplate specifications. Correctly install circuit breakers and motor overload protection devices.
Professional Installation:System installation, piping work, and commissioning must be carried out by qualified professionals to ensure system cleanliness, dryness, and vacuum levels.
Summary The Bitzer ZB21KQE is a high-efficiency semi-hermetic piston compressor optimized for the small to medium commercial refrigeration market. It delivers the inherent durability and efficiency of the K series in a compact size, making it an ideal power source for equipment requiring high performance, reliability, and low operating costs. For applications where space is limited and energy efficiency is a priority, the ZB21KQE represents a valuable choice.
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