The team at climahit.com has over 10 years of experience in building and maintaining VRV systems for large buildings at an affordable price. VRV (Variable-Refrigerant-Volume) was invented in 1982. and is a trademark of the Daikin Industries giant. With the thermoregulatory valves installed in the indoor units, the amount of freon passing through them is just as much as necessary. Everything is managed through DIII-NET communication, which allows countless control and monitoring options. A very appropriate system, especially when we have a beautiful building that we do not want to spoil with separate air conditioners. In most cases, the outdoor unit of the VRV system is on the roof of the building.
VRV machines are suitable for large shops, office buildings, even residential ones.
The VRV system has the ability to measure the energy consumed by any indoor unit.
Here's how to make a VRV installation with simple words:
1. The most important thing is to estimate in advance how much such a system would cost and whether it will fit into the budget set for heating and air conditioning. The advantages and disadvantages of VRV over other modes of air conditioning and heating should be identified. And if this is the best option, a few more steps should be taken.
2. It is a HVAC project that must be consistent with all the rooms that will be air conditioned. The cost of the project is justified by the calculated capacity of the air conditioners and by minimizing the risk of errors in the implementation of the VRV system.
- Daikin have their own software (VRV-EXPRESS), which is extremely easy to work with.
- Select the type and power of the indoor units (I will simply call them air conditioners for easier) of the VRV system and apply the design. (Here too, the location of the workplaces must be taken into account when it comes to office premises: each of us knows that it is not pleasant for the air conditioner to blow directly to us, especially the summer ...)
- Choose the best place for the outdoor unit.
"It's the copper pipes. Pipes in a VRV system have different diameters after each deviation and this must be strictly observed. Through the aforementioned program (DAIKIN-VRV-EXPRESS) we can implement the whole project of copper pipes together with their diameters and lengths.
- Wiring is also a very important part. There was a problem with a whole VRV system because of a confused cable. And it costs a lot of nerves and money to investors and installers. So it is good to have a wiring diagram (both power and operational).
3. Once the project is ready and co-ordinated with all, the installation of the VRV system comes into play.
- Note the location of each air conditioner in the system. So we have a clearer idea exactly where it is necessary to mount a deviation (or so called Joint).
- Mount brackets for copper pipes, taking into account the diameter of the pipe, the thickness of the insulation and the cables that will pass along with them. The clamp should be large enough to prevent pipe insulation. Otherwise there is a risk of condensation leaking from the pipes on the brand new ceiling.
- After the reinforcements are ready, the installation of the copper pipes for the VRV system begins. Here the very important thing is the purity of the pipes. It is unacceptable to have dust or moisture in the pipes that will necessarily contribute to system problems. The welds are made while nitrogen is fed into the tubes. It does not allow the production of water on the inside of the pipe. When pipes are cleaned from sawdust cuts, care must be taken not to get inside the system. This will cause a mechanical problem in the VRV compressor or clogging. The pipes must be completely insulated with a microporous rubber.
- Once the pipes are installed, we start with the cables. Most of the operating cables for the VRV system go along with the copper pipes, but can also be run separately on the grill. The power cables for the power supply to the indoor and outdoor units are usually included in the "Electro" section.
- There must also be a condensation line next to each air conditioner. It is best to do with a PVC tube.
- Once the installation is complete, the copper pipes should be sealed and inflated with high pressure nitrogen (usually around 30-35 bar). We have to stay for at least 72 hours without changing the pressure to make sure there is no gap in the VRV installation (for example, from a knob in a welding).
Once the installation is ready and tested, we only have to wait for the builders to be ready to install the indoor units of our VRV system.
4. Whether wall mounted, canal, cassette, ceiling or floor air conditioners are installed in a VRV system, the installation steps are the same (with very few exceptions.
- The air conditioner is strengthening. For wall and floor air conditioners it has dowels and screws, and for the channel and cassette - with anchors and studs.
- Once the indoor unit is in place, we start working on connecting the copper tubes (we must first drop the nitrogen with which we have inflated the VRV system). The so-called "cones" or "rollers" are made at the end of the copper tubes, and by means of brass nuts they are connected to the factory-made air conditioning nozzles. Again, insulate well with the microporous rubber.
- We connect the power and operating cables to the terminals of the air conditioner board. It is imperative that the wiring diagram is complied with. With Daikin's VRV system, the two-wire operating cables are connected to terminals F1 and F2 as they go from the outdoor / outdoor units and pass through each indoor unit in series.
- We connect the condensation lines to the air conditioner.
- Install front panels (wall and floor air conditioners) or decorative panel (for cluster air conditioners) or grilles to duct air ducts.
- I have not mentioned any installation of the VRV outdoor unit but it can be mounted on almost every stage of the above. There the copper pipes are connected by welds. The power and operating cables are tethered according to the wiring diagram.
5. We're almost at the finish, but we need to do a few more operations before running the VRV system:
- Once all the equipment is installed and bound, another sample of the entire VRV system is needed. Again, blow nitrogen at 30-35 bar and monitor the pressure for change over the next 72 hours. If there is no change, then we have a dense system ready for freon loading.
- After the samples, we can drop the nitrogen and move to the vacuuming process of the system. For such large installations it is necessary to have professional equipment. Vacuuming the VRV system is particularly important because it pulls the air out of the pipes. This is because there is moisture and gases in the air that will negatively affect the operation of the refrigeration circuit of the VRV system.
- Each VRV outdoor unit has a charged freon sufficient to operate the machine without installation. We need to charge a refrigerant (freon). Its quantity is calculated by the formula according to the length of the pipes in the system.
Everything on the system is mounted. Tubes, cables and condensation lines are connected. The system has been tested for density, vacuum and charged with freon. Then the VRV system is put into operation.
NOTE: All of the above activities as well as the VRV system must be carried out by trained specialists. Even small mistakes at work can lead to huge disappointments and gigantic repair costs.
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