Explore our high-performance refrigeration parts, copper line set accessories, and specialized maintenance tools engineered for industrial, commercial, and residential applications.
A deep metallurgic and operational analysis of C12200 Level Wound Coils used in heat exchanger and refrigeration assembly production.
Level Wound Coils (LWC) are the backbone of modern heat exchanger manufacturing, structural copper lines, and high-efficiency coils. Soft annealed LWC represents the copper wire and tubing configured in continuous spool layers, optimized for automated tube bending, hair-pin forming, and copper finned assembly lines. The alloy of choice for HVACR applications is C12200 Phosphorus-Deoxidized High Residual Phosphorus (DHP) copper. The minimal copper content is strictly maintained at 99.90% with a controlled phosphorus range of 0.015% to 0.040% to guarantee outstanding welding, brazing, and mechanical ductility properties.
Annealing is a critical thermal treatment that alters the grain structure of the drawn copper. For soft-annealed tempers (commonly designated as O60 or light-annealed O50), the material must possess a uniform grain size distributed between 0.025 mm and 0.060 mm. This specific range minimizes grain boundary slip during high-speed automated bending, eliminating the risk of micro-cracking, tube collapse, or localized wall thinning.
| Metallurgical Property | Standard Specification (ASTM B280 / EN 12735-1) | Ningbo Taojun Quality Target |
|---|---|---|
| Copper Purity (Cu + Ag) | ≥ 99.90% | 99.95% typical |
| Phosphorus Content (P) | 0.015% – 0.040% | 0.022% – 0.035% |
| Tensile Strength (Rm) | ≥ 220 MPa (for soft tempers) | 225 – 245 MPa |
| Elongation at Break (A50) | ≥ 40% | 45% – 52% |
| Average Grain Size | 0.025 – 0.060 mm | 0.035 – 0.045 mm |
| Cleanliness (Max Residue) | ≤ 0.38 mg/dm² (Inner surface) | ≤ 0.20 mg/dm² (Nitrogen purged) |
The operational stability of the final copper components (such as filter driers, capillary assemblies, and service valves) hinges directly on the mechanical uniformity of the raw LWC copper. Variations in wall thickness or tensile profiles can cause catastrophic rupture during high-pressure charging of eco-friendly refrigerants like R32, R290, and R410A, which operate at significantly higher pressures than legacy CFC/HCFC agents.
Ningbo Taojun Refrigeration Equipment Co., Ltd. — Decades of Innovation and Manufacturing Excellence.
Established in 1988 as the Xiangshan Refrigeration Accessories Factory of Zhejiang University, our enterprise has undergone over 35 years of rapid development. Today, Ningbo Taojun Refrigeration Equipment Co., Ltd. operates from a state-of-the-art facility located in the coastal city of Xiangshan, Ningbo, China.
We are a certified national High-Tech Enterprise specialized in the engineering, production, and distribution of copper filter driers, check valves, service valves, condensers, brass fittings, and copper capillary lines. Our dedication to rigorous production control, material science, and automation has enabled us to secure certifications such as ISO 9001:2015, EU RoHS, and US UL safety approval.
"We integrate the manufacturing science of soft-annealed copper with advanced filtration assembly technologies to deliver refrigeration components that survive the toughest commercial environments."
Engineered components designed for thermal management, protection, and fluid control.
Designed with high-purity copper shells and custom-charged desiccants (solid core or 3A molecular sieves combined with activated alumina) to absorb moisture, eliminate acid, and filter solid particulates down to 15 microns. Essential for protecting compressors against acid burnouts and freeze-ups.
Precision-machined brass components and copper extensions sourced from premium soft-annealed tubing. Engineered to handle systemic pressures up to 6.0 MPa, providing secure access points for refrigeration charging, pressure testing, and refrigerant evacuation.
Utilizing high-conductivity copper coils combined with continuous aluminum fins or wire frames. Optimized loop geometries are developed through computer fluid dynamics (CFD) simulation, increasing heat transfer coefficients while maintaining low system drag.
Leveraging academic partnerships, premium manufacturing equipment, and strict validation testing to eliminate component failures.
Collaboration with top researchers and a team of 15 engineers focusing on fluid dynamics and material properties.
Core drawing, forming, and automated cutting systems imported directly from Germany for sub-micron tolerances.
All filter driers and service valves undergo inline helium mass spectrometer testing to ensure leak rates under 1x10⁻⁸ mbar·l/s.
We only process DHP C12200 copper with full metallurgical heat-number traceability back to premium domestic smelters.
Contract manufacturing partner for household appliance brands like Haier, Midea, Whirlpool, Electrolux, and Gree.
To assure long-term reliability in varying climates, our finished products undergo stress test programs:
An analysis of raw material variables, geopolitical factors, and compliance regulations governing copper components.
Global procurement offices (GPOs) purchasing copper soft annealed LWC must evaluate factors beyond unit weight pricing. Total Cost of Ownership (TCO) is influenced by coil length consistency, weld density (minimizing splices per coil), and inner surface cleanliness. Typical automated hairpin benders run at high speeds; any micro-inclusion or internal surface carbon residue can score the tooling, leading to unexpected factory downtime.
Furthermore, standardizing on ASTM B280/EN 12735-1 specifications guarantees compatibility with automated coil expansion systems. The grain structure of soft annealed copper must handle expansion rates of 5% to 8% without splitting when the inner tubes are expanded to lock the heat exchanger fins.
The global phase-down of hydrofluorocarbons (HFCs) under the Kigali Amendment has accelerated the adoption of natural refrigerants such as Propane (R290) and Carbon Dioxide (R744). The thermal and chemical properties of these substances demand different pressure tolerances:
Tracing the path from copper LWC coils to finished component integration in refrigeration loops.
Ningbo Taojun's manufacturing operations are verified under global certification standards, ensuring consistency and regulatory compliance.
Building partnerships through engineering precision, environmental compliance, and service frameworks.
Our global support network includes a 24-hour engineering hotline, guaranteeing responsive technical assistance within 8 hours. We provide structural drawings (CAD/STEP files), material safety data sheets, chemical compliance documentation (RoHS/REACH), and on-site testing support for system integration. Every shipment is backed by our standard 12-month quality guarantee with direct factory replacement protocols.
Technical and logistics questions answered by our engineering and logistics teams.
Ensure complete installation integrity with our high-grade refrigeration fittings, valves, alloys, and assembly components.
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