Box-Type Refrigeration Unit
1. Product Overview
1.1 General Description
A box-type refrigeration unit is a self-contained unit that integrates the compressor, condenser, liquid receiver and electrical controls in a single casing. It is compact, easy to install and ready to run. Piping, evacuation and refrigerant charging are completed at the factory, so on site only the power supply and the evaporator lines need to be connected. It is suitable for small and medium cold stores, display cabinets and process cooling. The unit uses hermetic or semi-hermetic compressors with an air-cooled condenser, running reliably with low noise. The neat box design can be installed indoors or outdoors.
1.2 Key Features
- Compact monobloc design
- Factory-tested, plug and play
- Air-cooled condenser, no cooling water needed
- Hermetic / semi-hermetic compressor, low noise
- Comprehensive protection functions for safe, reliable operation
- Attractive appearance for indoor or outdoor installation
- Easy installation and convenient maintenance
- Multiple sizes to meet different requirements
1.3 Document Scope
This specification covers the design principles, performance parameters, system classification, key component selection, application fields, design standards and certifications, custom optional configurations, warranty terms, packaging and delivery of the box-type refrigeration unit, together with the information required for an inquiry. It serves as a comprehensive reference for procurement, model selection and technical communication.
2. Working Principle
2.1 Box-Type Unit Process Flow
Working cycle of the box-type unit: the compressor draws in refrigerant gas → compresses it into high-temperature, high-pressure gas → the air-cooled condenser rejects heat and condenses it → through the liquid receiver / filter drier → throttled by the expansion valve → supplied to the evaporator → evaporates and absorbs heat → refrigerant gas returns to the compressor. Besides the compressor and condenser, the box unit integrates all auxiliary equipment, including high/low pressure protection, oil pressure protection, overload protection and temperature control, ensuring safe and reliable operation. A fan provides forced air cooling, so no external cooling water is required.
3. System Classification
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|---|
| Small | BX-2, BX-4, BX-6 | Cooling capacity 2-6kW | Small cold stores / display cabinets | Hermetic compressor |
| Medium | BX-10, BX-15, BX-20 | Cooling capacity 10-20kW | Medium cold stores / process cooling | Semi-hermetic compressor |
| Large | BX-30, BX-50 | Cooling capacity 30-50kW | Large cold stores | Semi-hermetic / screw |
4. Technical Parameters
4.1 Main Technical Parameters of the Box-Type Refrigeration Unit
| BX-2 | BX-4 | BX-6 | BX-10 | BX-15 | BX-20 | BX-30 |
|---|
| Cooling capacity (kW) | 2 | 4 | 6 | 10 | 15 | 20 | 30 |
| Evaporating temp. (℃) | -10~5 | -10~5 | -15~5 | -15~5 | -20~5 | -20~5 | -25~5 |
| Compressor type | Hermetic | Hermetic | Hermetic | Semi-hermetic | Semi-hermetic | Semi-hermetic | Semi-hermetic |
| Condensing method | Air-cooled | Air-cooled | Air-cooled | Air-cooled | Air-cooled | Air-cooled | Air-cooled |
| Refrigerant | R22/R404A | R22/R404A | R404A | R404A | R404A | R404A | R404A |
| Fan power (kW) | 0.1 | 0.15 | 0.25 | 0.5 | 0.75 | 1.1 | 2×0.75 |
| Noise (dB) | ≤58 | ≤60 | ≤62 | ≤65 | ≤67 | ≤68 | ≤70 |
4.2 Dimensions and Weight
| | | | | |
|---|
| BX-2 | 600 | 500 | 700 | 50 | 0.3 |
| BX-4 | 700 | 550 | 800 | 70 | 0.4 |
| BX-6 | 800 | 600 | 900 | 100 | 0.5 |
| BX-10 | 1000 | 700 | 1100 | 180 | 0.7 |
| BX-15 | 1100 | 800 | 1200 | 250 | 0.9 |
| BX-20 | 1200 | 900 | 1400 | 350 | 1.1 |
| BX-30 | 1500 | 1100 | 1600 | 550 | 1.7 |
5. Applications
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|---|
| Cold storage | Small cold stores / chilled rooms | Plug and play | Convenience-store cold room |
| Retail | Supermarket display cabinets / chillers | Attractive and quiet | Fresh-food display |
| Catering | Kitchen refrigeration / freezing | Easy installation | Restaurant cold room |
| Chemical | Small process cooling | Compact structure | Reactor cooling |
| Pharmaceutical | Medicine refrigerated cabinets | GSP compliance | Pharmacy refrigeration |
| Agriculture | Seed / flower preservation | Stable temperature | Seed cold store |
6. Core Component Selection
| | | |
|---|
| Compressor | Compresses the refrigerant | Hermetic / semi-hermetic | Brands: Copeland / Tecumseh / Bitzer |
| Air-cooled condenser | Rejects heat on condensation | Copper tubes, aluminium fins + fans | Air volume matched to cooling capacity |
| Liquid receiver | Stores the refrigerant | Steel pressure vessel | With safety valve |
| Filter drier | Removes impurities and moisture | Copper / stainless steel body | Replace the core periodically |
| Expansion valve | Throttles and reduces pressure | Thermostatic expansion valve | Externally equalised type is more accurate |
| Electric control box | Electrical control | Schneider components | Includes all protection functions |
| Sight glass | Shows the refrigerant condition | With moisture indicator | Checks the moisture content of the system |
| High/low pressure protection | Pressure safety | Pressure controller | Adjustable setpoints |
7. Design Standards and Certifications
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|---|
| Relevant GB/T standards | Design and manufacture | Fully compliant | Type test report |
| GMP (cGMP) | Design, manufacture, documentation | Fully compliant | GMP compliance certificate |
| ISO 9001:2015 | Quality management system | Certified | ISO 9001 certificate |
| CE certification | Machinery safety / EMC | Optional | CE declaration of conformity |
| FDA | Food / pharmaceutical grade | Optional | FDA compliance documents |
8. Custom Optional Configurations
| | | | |
|---|
| 1 | Compressor brand | Copeland / Tecumseh / Bitzer | Copeland | Imported +1-2 weeks |
| 2 | Refrigerant | R22/R404A/R410A | R22 | R404A +1 week |
| 3 | Evaporating temperature | Medium / low / cryogenic | Medium | Cryogenic +2 weeks |
| 4 | Voltage | 220V/380V | 380V | 220V +1 week |
| 5 | Remote monitoring | None / RS485 / IoT | None | IoT +1-2 weeks |
9. Material Property Requirements
| | |
|---|
| Operating temperature | -40~250℃ | Depends on seals and materials |
| Corrosivity | Mild to moderate corrosion | Strong corrosion requires 316L or a lining |
| Explosion-proof requirement | Selected according to the site | Zone 1 / Zone 2 differ in grade |
10. Warranty Terms
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|---|
| Main equipment warranty | 12 months | All components included | 12 months from successful commissioning |
| Extended warranty (optional) | 24 months | Same as standard warranty | Must be purchased with the order |
| Wear-parts warranty | 6 months | Seals, bearings, etc. | Normal wear excluded |
11. Packaging and Delivery
| |
|---|
| Standard lead time | 6-10 weeks after order confirmation |
| Custom configuration lead time | 10-16 weeks |
| Incoterms | FOB Shanghai / CIF / DAP |
| Packaging | Export wooden case |
| Shipping | Container or break-bulk vessel |
12. Information Required for Inquiry
| | |
|---|
| 1 | Required cooling capacity | kW |
| 2 | Evaporating temperature required | ℃ |
| 3 | Ambient temperature | ℃ |
| 4 | Power supply specification | V/Hz/phases |
| 5 | Compressor brand preference | Domestic / imported |
| 6 | Installation location | Indoor / outdoor |
| 7 | Noise requirement | dB |
| 8 | Refrigerant preference | R22/R404A |
