13 Piping installationInstallation and operation manual17FXHQ-AVRV system air conditioner3P668115-3E – 2022.11If the temperature is higher than 30°C and the humidity is higherthan RH 80%, the thickness of the insulation materials should be atleast 20 mm to prevent condensation on the surface of theinsulation.13.2 Connecting the refrigerant pipingDANGER: RISK OF BURNING/SCALDING13.2.1 To connect the refrigerant piping to theindoor unitRefrigerant piping can be connected from following directions:abca Rear right pipingb Right pipingc Upward pipingRear right piping1 Remove the rear piping pipe port cover and cut out the holes forpiping. When cutting out the holes, make sure to avoid the knobpart of the cover.aba Rear refrigerant pipingb Rear piping pipe port cover2 Run the field supply pipes through the cut out holes.3 After the drain and refrigerant piping is finished, install the pipeport cover back. Run all the cables (except cable of expansionvalve) through the clamp of the pipe port cover and fix.a b ca Clamp of the pipe port coverb Cables (except cable of expansion valve)Upward pipingINFORMATIONL-shaped connection piping kit (optional accessory) isrequired.1 Remove the top pipe port cover and cut out the holes for piping.When cutting out the holes, make sure to avoid the knob part ofthe cover. Use an L-shaped connection piping kit (optionalaccessory) for the piping. Run the pipes through the cut outholes.aba Upward refrigerant pipingb Top pipe port coverRight piping1 Remove the reinforcing plate at the right side and put back thescrew in the original position on the indoor unit.2 Remove the decoration side panel.3 Remove the rectangular part of the decoration side panel.a b e fdca Round partb Rectangular part of the decoration side panelc Decoration side paneld Screwe Reinforcing platef Right refrigerant piping4 After the drain and refrigerant piping is finished, install thereinforcing plate (optional step) and the decoration side panelback.ac ba Screwb Reinforcing platec Decoration side panel▪ Pipe length. Keep refrigerant piping as short as possible.▪ Flare connections. Connect refrigerant piping to the unit usingflare connections.▪ Insulation. Insulate the refrigerant piping on the indoor unit asfollows: