Daikin VRV

Information on Daikin R-32 branch selector boxes are not yet publicaly available. Contact your local Daikin representatives for preliminary information and selections on R-32 VRV heat recovery systems. Note that many R-410A systems are approaching or already beyond their last order dates. IMPORTANT: Only R-410A branch selector boxes can be used with R-410A outdoor units, and only R-32 branch selector boxes can be used with R-32 outdoor units. They cannot be mixed and matched.

Please visit the DXS Refrigerant Transition Resource Center for more information: https://info.dxseng.com/dxs-refrigerant-transition-resource-center

Two main reasons: First, the 3-pipe heat recovery system results in the boxes not requiring a heat exchanger to separate the mixed phase supply line of typical 2-pipe heat recovery systems. These heat exchangers usually generate condensate. Second, all Daikin branch selector boxes are fully foam insulated from the factory, preventing any copper piping or expansion valve body from being exposed. This insulation improves performance, reduces sound levels and ensures no condensate drains are ever required.

There are many reasons and advantages to 3-pipe heat recovery systems, revolving around improved efficiency, low ambient heating, reduced refrigerant charges and branch selector box flexibility. In heating, the 3rd pipe becomes a dedicated hot gas line off the compressor, resulting in no capacity and efficiency losses in heating, and the maintenance of high discharge air temperatures in low ambient conditions. In cooling, the 3rd pipe acts as a secondary suction line, also reducing pipe losses and improving efficiency. The 3-pipe arrangement also allows Daikin branch selector boxes to not need any drain connections, reducing install costs. Finally, this arrangement allows for a mix of small single port branch boxes, all the way to 12 port branch boxes, which can be optimized in buildings for an overall reduction in piping and installation cost.

The mounting location is relatively flexible. They can go in ceilings, in closests / storage rooms, in mechanical rooms, or even right below the VRV indoor unit (for example, when using vertical ducted indoor units). They do not need to be in full conditioned spaces, however they should not be installed outdoors. The location should be chosen based on a few criteria: optimizing / reducing the overall amount of refrigerant piping and install costs; proper space around the box to ensure enough service space and enough length of straight copper pipe in and out of the box (usually 18"); and finally, proper access for service of the electrical panel and of any field installed isolation valves.