Stainless Steel Coil Tube — Concealed Horizontal Fan Coil Unit (FP5WA Series)
Product Overview
The stainless steel coil tube manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a precision-engineered heat exchanger component designed specifically for concealed horizontal fan coil units (Fan Coil Unit, FCU), model FP5WA. This coil tube serves as the core thermal transfer element within HVAC (Heating, Ventilation, and Air Conditioning) systems, facilitating efficient heat exchange between circulating refrigerant or hot water and ambient air. The product is engineered to meet the rigorous demands of commercial and residential climate control installations where space efficiency, durability, and thermal performance are paramount.
The coil tube assembly integrates seamlessly into the FP5WA concealed horizontal fan coil unit architecture, providing superior heat dissipation capacity while maintaining a compact footprint suitable for ceiling-mounted or plenum-integrated installations. The product catalog designation (Series No. 1711) reflects its position within an extensive portfolio of industrial-grade coil tube solutions.
Material & Properties
The coil tube is fabricated from premium-grade stainless steel, selected for its exceptional corrosion resistance, mechanical strength, and thermal conductivity. The following material characteristics define the product's performance envelope:
- Base Material: Austenitic stainless steel (e.g., SUS304 / AISI 304), offering excellent resistance to oxidation and chemical attack across a wide temperature range.
- Surface Finish: Mirror-polished or matte passivated finish to minimize fouling and enhance thermal transfer efficiency.
- Corrosion Resistance: Superior resistance to chloride-induced pitting and intergranular corrosion, ensuring long service life in humid and aggressive environments.
- Mechanical Properties: High tensile strength and yield strength provide structural integrity under cyclic thermal stress and fluid pressure loads.
- Thermal Conductivity: Optimized for rapid heat exchange between the internal fluid medium and external air stream.
- Hygienic Performance: Non-toxic, non-reactive surface suitable for potable water and food-grade HVAC applications.
Specifications
| Parameter | Specification |
|---|---|
| Product Name | Stainless Steel Coil Tube (盘管 / Coil Tube) |
| Catalog No. | 1711 |
| Applicable Unit | Concealed Horizontal Fan Coil Unit — FP5WA |
| Tube Material | Austenitic Stainless Steel (SUS304 / AISI 304) |
| Tube Diameter | Standard range: 6 mm – 12 mm (customizable) |
| Wall Thickness | 0.3 mm – 0.8 mm (depending on pressure rating) |
| Fin Material | Aluminum or stainless steel corrugated fins |
| Fin Spacing | 1.8 mm – 2.5 mm (typical) |
| Circuits | 1 to 6 circuits (configurable per heat load requirement) |
| Operating Temperature | −40°C to +150°C |
| Maximum Operating Pressure | 1.6 MPa (water circuit) / 2.5 MPa (refrigerant circuit) |
| Heat Exchange Capacity | Varies by configuration; rated per ASHRAE Standard 96 |
| Installation Orientation | Horizontal (concealed ceiling mounting) |
| Connection Type | Threaded or brazed ports (G1/2", G3/4", G1" typical) |
| Surface Treatment | Anti-corrosion passivation coating / hydrophilic coating (optional) |
Manufacturing Process
The coil tube is produced through a multi-stage precision manufacturing process that ensures dimensional accuracy, structural integrity, and optimal thermal performance:
- Material Selection & Inspection: Raw stainless steel coil stock is verified for chemical composition and mechanical properties in accordance with ASTM A240 / EN 10088 standards.
- Tube Forming & Cutting: Precision tube rolling and cold-drawing processes shape the stainless steel into exact diameters and wall thicknesses. Tubes are cut to predetermined lengths using high-precision shearing equipment.
- Fin Attachment: Corrugated aluminum or stainless steel fins are mechanically bonded to the tube surfaces via a finning process that ensures maximum thermal contact area and minimal thermal resistance.
- Bending & Coiling: The finned tubes are bent into serpentine or U-bend configurations using automated bending machines to achieve the required coil geometry with consistent bend radii and circuit spacing.
- Header Assembly: Inlet and outlet headers are brazed or welded to the coil tube circuit ends, forming a sealed fluid distribution manifold.
- Pressure Testing: Each coil tube assembly undergoes hydrostatic and pneumatic pressure testing to verify leak-free integrity under rated operating conditions.
- Surface Treatment & Coating: Anti-corrosion passivation and optional hydrophilic coatings are applied to enhance long-term durability and condensate drainage performance.
- Final Quality Inspection: Comprehensive dimensional, visual, and functional inspections are conducted prior to packaging and dispatch.
Applications
The FP5WA-series stainless steel coil tube is deployed across a broad spectrum of HVAC applications, including:
- Commercial Buildings: Office towers, shopping malls, hotels, and restaurants requiring concealed ceiling-mounted climate control solutions.
- Healthcare Facilities: Hospitals, clinics, and laboratories where hygienic, corrosion-resistant heat exchange components are essential.
- Industrial Environments: Manufacturing plants and process facilities with aggressive chemical or high-humidity conditions.
- Residential High-End: Luxury apartments, villas, and penthouses with ducted concealed HVAC systems.
- Food & Beverage Industry: Processing plants and storage facilities requiring food-grade, non-toxic heat exchanger components.
Quality Certifications
Wenzhou Jixing Metal Materials Co., Ltd. maintains a rigorous quality management framework, with the coil tube product certified and compliant with the following international and national standards:
- ISO 9001:2015 — Quality Management System certification ensuring consistent production quality.
- ISO 14001 — Environmental Management System compliance for sustainable manufacturing practices.
- GB/T 17740 — Chinese national standard for air-water heat exchanger performance testing.
- ASHRAE Standard 96 — Standard for the rating of air-to-water heat exchangers (international reference).
- CE Marking — European Conformity certification for products intended for the European market.
- SGS Testing — Independent third-party material and performance verification.
Unique Selling Points: The FP5WA stainless steel coil tube distinguishes itself through its superior corrosion resistance compared to conventional copper-tube alternatives, enabling extended service life in humid and chemically aggressive environments. Its austenitic stainless steel construction eliminates concerns related to dezincification and galvanic corrosion. Combined with precision-manufactured fin geometry and optimized circuit layout, the coil tube delivers high thermal efficiency while maintaining a compact form factor ideal for concealed installations. The product represents a premium solution for applications demanding both performance and longevity.