Vaillant refrigerant piping 5/8" (15.88 mm) - 10 m, insulated

Product detailed description

Vaillant refrigerant pipe 5/8" - 10 m, insulated

This insulated copper refrigerant pipe with a diameter of 5/8" (15.88 mm) and a length of 10 metres is among the largest diameters available in the Vaillant range of installation accessories for climaVAIR air conditioning units. It is used mainly as the gas (suction) line of the refrigerant circuit for higher output classes of indoor units (for example climaVAIR pro VAIB1-050WNI and VAIB1-065WNI with an output of 5.0 to 7.0 kW) and for multi-port climaVAIR multi outdoor units (VAM1), where a single outdoor unit simultaneously serves several indoor units and requires higher refrigerant flow capacity.

The pipe comes from the factory fitted with thermal insulation along its entire length, which reduces heat loss and prevents condensation of air moisture on the pipe surface. Due to the larger diameter, and therefore the greater weight of the copper itself, handling this pipe requires somewhat greater attention to fixing along the route compared with thinner diameters (1/4" or 3/8").

Technical parameters

When is the 5/8" diameter used

The 5/8" diameter is prescribed in climaVAIR systems mainly where a larger amount of refrigerant needs to be transferred with a lower pressure drop - typically for higher-output indoor units (5.0 - 7.0 kW) or for multisplit outdoor units that simultaneously supply several indoor units at once. In such setups, 5/8" is usually combined with a liquid line of a smaller diameter (3/8" or 1/4" depending on the specific combination). Always check the exact prescribed diameter combination for a given setup in the installation manual of the specific units, since in multisplit systems the diameter of the main line from the outdoor unit may differ from the diameters of the individual lines to the indoor units.

Installation principles when working with larger-diameter refrigerant pipe

Cutting copper pipe of this diameter is done with a copper pipe cutter with sufficiently wide jaws for 5/8" - it is important to cut perpendicularly and without burrs, which could damage the seal of the flare joint. When forming the flare cone on a thicker pipe, greater attention must be paid to forming the cone evenly around the entire circumference, since a larger diameter is more prone to uneven stretching of the material than thinner pipes. The tightening torque of the flare nut for this diameter is higher than for 1/4" or 3/8" - always follow the value prescribed by the manufacturer in the installation manual of the specific unit.

Before charging the refrigerant, the circuit is purged with nitrogen, followed by a pressure test and finally evacuation to the prescribed vacuum level, which removes moisture from inside the pipes and units. These operations, as well as the actual refrigerant charging (with a larger pipe diameter usually also a larger charge quantity due to the circuit volume), may only be carried out by a company authorised to work with F-gases.

Due to the greater weight of pipe of this diameter, pay increased attention to fixing it along the entire route, especially on horizontal sections and wall passages, to prevent sagging or stress on the flare joints caused by the pipe's own weight.

Frequently asked questions

Is the 5/8" diameter also suitable for a standard simple split unit, or only for higher-output/multisplit systems?

It is used mainly for higher-output units (from approx. 5.0 kW) and for multi-port multisplit outdoor units - it is usually not required for standard low-output single-split systems. Check the installation manual of the specific unit.

Is the pipe already insulated?

Yes, factory-applied insulation along the entire length.

Is a length of 10 m sufficient?

For a standard installation in most households, yes; for longer routes we recommend the 25-metre variant of the same diameter, which is also part of our range.

Why is this diameter more expensive than thinner variants?

The price is due to the larger amount of copper used per metre of length and the thicker insulation needed to cover the larger pipe diameter.

Storage and handling before installation

Until installation, keep both ends of the pipe sealed as supplied - this prevents moisture and dirt from entering. Due to the larger diameter and weight of the coil, when handling also make sure the pipe is not bent over a sharp edge during carrying or storage, as this could damage the insulation or slightly deform the pipe's cross-section.

Why choose original Vaillant pipe

For higher-output units and multisplit systems, correct sizing of the pipe diameter is particularly important, as these systems work with a larger volume of refrigerant and higher flow. Using pipe with the correct diameter, wall thickness and insulation quality according to the manufacturer's specification is a prerequisite for maintaining the warranty on the air conditioning system and achieving the declared output.

Compatibility with multi-port multisplit outdoor units

For climaVAIR multi (VAM1) outdoor units, which simultaneously serve two to five indoor units, the main refrigerant pipe line from the outdoor unit to the first branching point (the so-called refnet distributor) is often required to be exactly 5/8" or larger, while the individual lines to the indoor units themselves may be thinner depending on the output of the specific connected unit. The precise sizing of both the main and branch lines for a given combination of outputs is part of the installation manual of the multisplit system and varies from setup to setup.

When designing the route of the main line, it is advisable to allow for sufficient length reserve of this pipe already at the time of ordering, since additional joining of shorter sections on the high-flow main line increases the number of potentially risky points (brazed or crimped joints) on the most heavily loaded section of the entire circuit.

Tightness check and safety

After installation, all flare joints are checked for tightness - for example with a foaming leak detection spray or an electronic refrigerant leak detector. With a larger pipe diameter, any refrigerant leak represents a relatively higher volumetric flow than with thinner diameters, which is why a thorough tightness check after installation is especially important.

Cutting, joining and extending the route

For routes longer than the supplied 10 m, packages are joined with copper connecting material, while the inside of the pipe is purged with nitrogen during brazing to prevent scale forming on the inner surface. The joint is then re-insulated with self-adhesive tape so that the insulation remains continuous. For a route shorter than 10 m, the excess section is cut off with a copper pipe cutter.

Warranty and compatibility

The pipe is a supplementary installation material for Vaillant climaVAIR systems, covered by the standard 2-year warranty period. Using pipe that matches the manufacturer's specification is one of the prerequisites for maintaining the warranty on the air conditioning unit as a whole.

Extended frequently asked questions

Can this pipe also be used with other brands of air conditioning?

Yes, it is standard ACR copper pipe with a common diameter of 5/8", also compatible with other brands using the same gas line diameter. Always check the prescribed diameter in the installation manual of the specific unit.

Why is checking the pipe's fixing more important with a larger diameter?

A larger diameter means greater pipe weight per metre of length - insufficient fixing can cause the pipe to sag and place long-term stress on the flare joints, increasing the risk of the joint gradually loosening.

Does the pipe need any preparation before installation?

No, it is supplied ready for installation - simply cut it to the required length, form the flare cones and connect it to the units.

Material and processing of the larger-diameter copper pipe

Even at 5/8" diameter, this is high-purity ACR copper, degreased on the inside directly at the factory. At this diameter the pipe is somewhat stiffer than thinner variants, so when shaping bends with a smaller radius it is always recommended to use a pipe bender of the appropriate diameter - manual shaping without a tool risks flattening the cross-section, which would restrict refrigerant flow exactly where the pipe needs to carry the greatest volume.

Effect of diameter on system performance and noise

An insufficient gas line diameter on a higher-output unit results not only in a loss of performance but often also in increased noise from refrigerant flow in the pipe, as the refrigerant must flow through a narrowed cross-section at higher velocity. A correctly sized 5/8" diameter, where prescribed for the units, ensures quiet operation and full use of the unit's declared output without unnecessary pressure losses along the route.

Which pipe diameter and length do I need

In this category you will find Vaillant refrigerant pipe in diameters of 1/4", 3/8", 1/2" and 5/8", in lengths of 10 m and 25 m. This product - 5/8" in a 10-metre package - is intended for standard routes with higher-output units and multisplit systems. For longer routes, choose the 25-metre variant of the same diameter from our range to avoid unnecessary joints.

Comparison with the 25-metre package of the same diameter

Delivery and packaging

The pipe is supplied coiled up in protective packaging that protects the insulation from abrasion during transport. Due to the larger diameter and weight of this package compared with thinner diameters in this category, we recommend that when ordering you take into account that courier delivery may have slightly different delivery conditions compared with thinner variants, depending on the weight limits of the chosen carrier.

Recyclability and the environment

The copper used in this pipe is fully recyclable - when replacing or shortening the route, take the offcuts to a recycling centre or scrap metal buyer. Due to the larger diameter, a metre of this pipe contains more copper than thinner diameters, which also represents a higher material value of the offcuts in terms of recycling.

Refnet distributors and the main line in multisplit systems

For multi-port climaVAIR multi outdoor units, the refrigerant circuit beyond the branching point (the so-called refnet) splits towards the individual indoor units into thinner lines according to the output of each of them, while the main line between the outdoor unit and the first distributor carries the sum of the outputs of all connected indoor units - which is why a diameter of 5/8" or larger is most often prescribed for this section. The placement and orientation of refnet distributors (horizontal or vertical mounting depending on the distributor type) is part of the installation manual of the specific multisplit system and affects the even distribution of refrigerant among the individual indoor units.

When designing the route of the main line, it is advisable to allow for sufficient length reserve of this pipe already at the time of ordering, since additional joining of shorter sections on the high-flow main line increases the number of potentially risky points (brazed or crimped joints) on the most heavily loaded section of the entire circuit.

Transport and handling of the larger-diameter coil

The 5/8" diameter pipe coil is noticeably heavier and less flexible than thinner diameters (1/4", 3/8"), which must be taken into account both when transporting it to the installation site and when unwinding the coil before installation. It is recommended to unwind the coil slowly and gradually, not by pulling sharply, to avoid an uncontrolled spring-back of the remaining coil. When carrying several packages at once, make sure the coils do not press their edges into the insulation of an adjacent package, which could compress or mechanically damage it even before installation.

Summary - who this product is intended for

The 5/8" refrigerant pipe in a 10-metre package is intended primarily for installation companies and heating engineers carrying out the installation of higher-output climaVAIR pro units (5.0-7.0 kW) or climaVAIR multi multisplit systems for shorter routes between the outdoor and indoor unit. When ordering a complete installation set for one pair of units, in addition to this pipe you will also need the corresponding smaller-diameter liquid line (typically 3/8" or 1/4" depending on the specific combination of units) - you will find both lines in this category of Vaillant air conditioning accessories, along with other accessories such as replacement and antibacterial filters for indoor units.

If you are not sure which exact diameter and length you need for your specific setup, we recommend consulting with your installation company before ordering - an incorrectly chosen pipe diameter can only be replaced after connection and refrigerant charging at additional cost for re-evacuating and re-charging the circuit with refrigerant, so it is worth paying sufficient attention to choosing the correct size right from the start. If in doubt, contact our customer service - we will be happy to help you navigate the range of accessories for climaVAIR units according to the model and configuration you are planning to install. Simply state the specific models of the outdoor and indoor unit and the approximate length of the route between them in your inquiry, so that we can recommend the correct combination of pipe diameters and lengths for your specific installation.