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What Are Insulated Copper Tubes? The Backbone of Air Conditioning Installation
Insulated copper tubes are special copper tube types covered with closed-cell polyethylene foam (PEX) that carry the refrigerant (R32, R410A, R22) between the indoor and outdoor units in split air conditioner, VRF, multi-split and heat pump systems. The efficiency, energy consumption, condensation behavior and long service life of an air conditioning installation depend directly on the quality of the insulated copper tube used. At Yedepa.com we offer HVAC technicians, refrigeration technicians and air conditioner installation companies Ecutherm2™ brand, Class B and Class E certified insulated copper tube types in a wide range of sizes.
Using only bare copper tube causes serious problems in an air conditioning system: condensation, dripping, heat loss, reduced compressor efficiency and icing. For this reason it is mandatory to use oil-free (air conditioning grade) copper tubes with flame-retardant PEX insulation that comply with the DIN EN 12735 and TS EN 14313 standards. All Ecutherm2™ products available at Yedepa.com comply with these standards.
Technical Details and Operating Principle
An insulated copper tube consists of two main components: air conditioning grade copper tube (Cu-DHP, 99.90% purity) and closed-cell PEX foam insulation. Air conditioning grade copper tube is a special product that contains no trapped oil residue inside, is dried at the factory and is shipped nitrogen-charged. Ordinary plumbing copper cannot be used for air conditioning because the oil inside it is incompatible with the compressor oil and quickly clogs the system.
Thanks to its closed-cell structure, PEX (cross-linked polyethylene) insulation does not absorb condensate, minimizes heat transfer and offers B1 / Class E fire retardancy. Insulation thickness is produced in two main groups: 9 mm and 13 mm. 9 mm insulation is preferred in standard split air conditioners, short tube runs and Class B applications, while 13 mm insulation is mandatory for long runs, VRF systems, outdoor applications and Class E projects.
Types and Models
Insulated copper tubes are divided into two types according to their intended use: single and twin. In twin products the liquid and gas tubes are combined in the same insulation block; in single products one tube is inside one insulation sleeve. Thanks to its installation speed and aesthetic advantage, the twin type is the favorite of professional technicians.
| Type | Common Size Combinations | Application |
|---|---|---|
| Twin | 1/4" + 3/8", 1/4" + 1/2", 1/4" + 5/8", 3/8" + 1/2", 3/8" + 5/8" | Split, multi-split, mini VRF |
| Single | 5/8", 3/4", 7/8", 1.1/8" | VRF main line, long distance, commercial air conditioning |
Sizes are given in the imperial inch system. For example, 1/4" liquid tube (6.35 mm OD), 3/8" small gas tube (9.52 mm), 1/2" medium gas tube (12.70 mm), 5/8" large gas tube (15.88 mm), and 3/4" (19.05 mm) is used in high-capacity systems.
Which Model Should You Choose? Decision Guide by Air Conditioner Capacity
The right insulated copper tube must be selected according to the air conditioner capacity and the outdoor unit manufacturer's table. The table below is a practical summary for HVAC technicians:
| Air Conditioner Capacity | Recommended Tube Size | Insulation |
|---|---|---|
| 9,000 - 12,000 BTU | 1/4" + 3/8" | 9 mm PEX |
| 18,000 BTU | 1/4" + 1/2" | 9 mm or 13 mm PEX |
| 24,000 BTU | 3/8" + 5/8" or 1/4" + 5/8" | 9 mm / 13 mm PEX |
| 36,000 - 48,000 BTU | 3/8" + 5/8" or single 5/8" + 3/4" | 13 mm PEX (mandatory) |
| VRF / Rooftop | Single 3/4", 7/8", 1.1/8" | 13 mm+ PEX, Class E |
Important note: When the tube length exceeds 10 meters, move up one size and always choose 13 mm insulation. On runs left outdoors, it is recommended to additionally wrap the insulation with aluminum tape for UV protection.
Insulated Copper Tubes Available at Yedepa.com
At Yedepa.com we offer HVAC technicians and service technicians a wide range of Ecutherm2™ brand insulated copper tubes. Current products in our stock:
- 3/8" and 5/8" Twin Insulated Copper Tube - Ecutherm2™ | 9mm PEX Insulation | Class B — Ideal for split / multi-split systems of 36,000 BTU and above. Price: 13 USD
- 1/4" and 5/8" Twin Insulated Copper Tube - Ecutherm2™ | 13mm PEX Insulation | Class E — Class E fire safety for long-run and outdoor applications. Price: 12 USD
- 1/4" and 5/8" Twin Insulated Copper Tube - Ecutherm2™ | 9mm Black PEX Insulation | Class B — A neat look on concealed runs thanks to its black insulation. Price: 12 USD
- 1/4" and 5/8" Twin Insulated Copper Tube - Ecutherm2™ | 9mm PEX Insulation | Class B — The standard solution for 24,000 BTU air conditioners. Price: 12 USD
- 3/4" Single Insulated Copper Tube - Ecutherm™ | 9mm PEX Insulation | Class B — For VRF main lines and high-capacity systems. Price: 10 USD
- 3/8" and 1/2" Twin Insulated Copper Tube - Ecutherm2™ | 9mm Light Cream PEX Insulation | Class B — Aesthetic installation with cream-colored insulation. Price: 10 USD
- 5/8" Single Insulated Copper Tube - Ecutherm™ | 9mm PEX Insulation | Class B — Gas line solution suitable for single use. Price: 9 USD
- 1/4" and 1/2" Twin Insulated Copper Tube - Ecutherm 2™ | 9mm PEX Insulation | Class B — The classic choice for 18,000 BTU air conditioners. Price: 9 USD
- 1/4" and 1/2" Twin Insulated Copper Tube - Ecutherm2™ | 13mm PEX Insulation | Class E — Class E safety for 18,000 BTU + long runs. Price: 9 USD
- 1/4" and 3/8" Twin Insulated Copper Tube - Ecutherm2™ | 9mm PEX Insulation | Class B — The most economical solution for 9,000-12,000 BTU split air conditioners. Price: 8 USD
Ecutherm2™ Brand and Manufacturing Quality
Ecutherm2™ is a professional brand specialized in the air conditioning sector that produces a combination of oil-free air conditioning grade copper tube and PEX insulation. Because the copper tubes are shipped nitrogen-charged with their ends capped, no moisture or oxidation forms inside. Since the PEX insulation has a closed-cell structure, it does not sweat, prevents heat loss and retains its flexibility for years. Class B products are used in standard residential and small commercial applications; Class E products are used in industrial buildings, shopping malls and VRF projects, where fire safety is critical.
Professional Selection Criteria
When buying insulated copper tube, an HVAC technician should always evaluate the following criteria:
- Copper purity: Air conditioning grade copper should be at least 99.90% pure Cu-DHP.
- Wall thickness: 0.61 mm for 1/4", 0.71 mm for 3/8" and 0.81 mm for 5/8" are accepted as minimums.
- Insulation density: 28-35 kg/m³ is the optimum value.
- Classification: Class B or E certification should be checked for fire safety.
- End caps: Both ends of the tubes should be sealed with plastic plugs (prevents nitrogen from escaping).
- Flexibility: The copper should be cold-drawn and annealed so that it can be bent without cracking.
- Insulation-to-copper bond: The insulation should be in full contact with the copper, with no gaps.
All Ecutherm2™ products sold at Yedepa.com meet all of these criteria and go through quality control processes.
Installation Tips and Usage Recommendations
Correct installation is as important as choosing the right product. The following tips significantly reduce the failure rate:
- To cut the tube, use a tube cutter; never use a saw (chips get into the system).
- After cutting, always carry out reaming (deburring).
- When bending the tube, use a tube bending spring or bending vise; kinks lead to compressor failure.
- When flaring, tighten slowly and evenly to avoid cracks; the flare angle must be 45°.
- After installation, always carry out evacuation (at least 500 microns) and a leak test.
- Pass the tube through wall penetrations in a protective sleeve and do not crush the insulation.
- Wrap insulation left outdoors with UV-resistant tape; bare PEX breaks down in the sun within 2-3 years.
- When bundling several tubes into a single run, clamp them at intervals of at least 30 cm.
Maintenance and Long Service Life
Once installed, insulated copper tube theoretically operates trouble-free for 15-20 years. However, the following checks should be made once a year: whether the insulation has suffered bird, rodent or UV damage, whether the clamps have loosened, and whether there are oil traces (a sign of a leak) at the elbows. If the insulation is damaged locally, instead of replacing the entire line, a local repair can be made with a repair sleeve; accessory parts for this purpose are also available at Yedepa.com.
Frequently Asked Questions (FAQ)
1. What is the difference between insulated copper tube and plumbing copper?
Air conditioning grade copper tube is oil-free, nitrogen-charged inside and has capped ends. Plumbing copper contains oil and moisture residue; if connected to an air conditioning system, the compressor fails within 1-2 weeks.
2. Should I choose 9 mm or 13 mm insulation?
If the tube run is shorter than 10 meters, stays indoors and the air conditioner is below 24,000 BTU, 9 mm is sufficient. For runs over 10 meters, outdoor runs or systems above 36,000 BTU, 13 mm is mandatory.
3. What is the difference between Class B and Class E?
Class B offers standard fire retardancy, while Class E offers a higher level of fire resistance. In public buildings such as shopping malls, hospitals and hotels, Class E insulation is generally mandatory.
4. Does twin tube fit every air conditioner?
No, in twin tubes two different diameters are joined in the same block. You must read the liquid and gas connection sizes of your air conditioner from the outdoor unit label and choose the matching combination (for example 1/4" + 3/8" or 3/8" + 5/8").
5. Are different tubes used in R32 air conditioners?
R32 is a flammable gas (A2L class), so it is more critical that the tubes do not leak. Air conditioning copper tubes of the same size and class are compatible with R32, R410A and R22; however, more careful installation and tightening with a torque wrench are recommended.
6. Should I cut the tube myself or buy it in ready-made lengths?
Yedepa.com offers coils in standard lengths (5m, 10m, 15m, 20m, 25m, 50m). If you have technician experience, cutting from the roll is both economical and flexible; however, it is safer for amateur users to choose ready-made lengths.
7. Is there a performance difference between black, cream and white insulation?
Thermal performance is the same; the color difference is for aesthetic purposes. Black insulation is slightly more UV-resistant, while cream and white look neater on concealed indoor runs.
Conclusion and Yedepa.com Advantages
Choosing insulated copper tube is a decisive decision for the efficiency, quietness and long service life of an air conditioning system. The wrong size, poor-quality copper or inadequate insulation come back later as compressor failure, high electricity bills and condensation problems. At Yedepa.com we stock only proven brands in the sector such as Ecutherm2™; we supply HVAC technicians and refrigeration technicians with Class B and Class E options, 9 mm and 13 mm insulation thicknesses and all twin and single size combinations from a single source.
Advantages offered by Yedepa.com:
- Wide stock: All popular sizes and insulation thicknesses in stock at the same time.
- Professional support: Technical consultancy on tube size according to air conditioner capacity.
- Focus on technicians and service companies: Special pricing for HVAC technicians on bulk purchases.
- Reliable brand: Only air conditioning grade, oil-free, nitrogen-charged, certified products.
- Fast shipping: Shipment across Turkey with secure packaging.
Whether it is a single split air conditioner installation or a large VRF project, Yedepa.com is the right place for your insulated copper tube needs. You can contact our customer service with your questions and have the right size for your project confirmed before placing an order.