DX Coils
Bespoke DX coils matched to your refrigerant system — circuiting, distributor selection and capacity. R32, R454B, CO₂ compatible.
Technical Specifications
Type
DX Cooling / Reverse Cycle
Test Pressure
Up to 47 barG
Tube
Copper
Fin
Al, AluP, Cu, Cu-ET
Refrigerants
R32, R410a, R134a, R407c +
Direct Expansion Air Cooling Coils
Construction & Specification
Our coils are built to the highest standards using premium materials:
- Seamless drawn copper tubes manufactured to EN12735-2
- Mechanically expanded into aluminium fins with die-formed self-spacing collars
- Copper return bends, liquid distributors, and tubular headers silver brazed for durability
- Heavy gauge galvanised steel casing for a rigid and robust structure
- Tube end plates designed to accommodate thermal expansion and contraction
Drainage System
- Standard vee-formed drain trays with air baffles to prevent bypass
- BSP(M) drain connections included
- Optional perforated bottom plates for integration with customer drain systems
Moisture Management & Water Carryover
Condensate management is critical for efficient coil operation. Factors such as:
- Face velocity
- Fin spacing
- Coil height
- Latent cooling rate (SHR)
can influence water carryover.
Systems with high fresh air content are particularly susceptible. Our design engineers can recommend solutions such as:
- Moisture droplet eliminators (minimum additional depth: 180 mm)
- Intermediate drain pans to prevent condensate build-up
- Optimised downstream drainage configurations
Trapping & Drainage
Proper condensate trapping is essential to prevent flooding and air blowback:
- Drain lines must be correctly trapped
- Designed for both positive and negative pressure systems
- Drain-to-tundish configurations supported
Modular & Stacked Coil Options
For large installations:
- Coils can be supplied in multiple sections for easier handling
- Each section includes its own drain pan
- Integrated drainage systems allow condensate to flow to a main collection tray
Our engineers will advise on the most cost-effective configuration.
Performance & Design
All coils are selected using advanced computer software to ensure:
- Optimal thermal performance
- Efficient refrigerant flow
- Minimal pressure drop
Each unit is tailored precisely to meet your system requirements.
Key Advantages
- Precision circuiting — matched to your system for optimal refrigerant distribution and capacity.
- Low-GWP ready — designed for R32, R454B, CO₂ and other modern refrigerants.
- Pressure tested — all coils fully tested before dispatch.
- Custom geometry — built to your dimensions, connections and system layout.
Optional Features
Enhanced Coil Performance — Polyester-coated aluminium fins for corrosive environments.
Fin Material — Copper or Tinned Copper fins available.
Boxed Ends — for high-pressure ducted systems to reduce air leakage.
Casing Material — Brass or Stainless Steel casings available.
Defrost Solutions — for low-temperature applications where frost formation is likely, defrost systems can be integrated into the coil design.
Typical Applications
AHUs
Duct Mounted Coils
Data Centres
Industrial Cooling
Process Cooling
Downloads
Product Catalogue
Full specifications, dimensions and performance data.
Operation & Maintenance Manuals
Installation, commissioning and maintenance instructions.
Standards & Accreditations
All our products meet exceptional standards, achieved by testing and inspecting our coils and products regularly and adhering to strict procedures.
"HC Coils are great to work with, on time, efficient, clean and tidy.
Project References
Private Healthcare Group
Product: Quiet DX coil solution
Retrofitted into recovery ward ventilation, reducing system noise by 28%.
Common Questions — DX Coils
Not Sure Which Product?
Talk to our engineering team — we'll help you find the right solution.