5310.4.5. Indoor unit drain piping• Be sure to use the drain hose provided (accessory item.)• Drain piping must have down-slope (1/50 to 1/100): be surenot to provide up-and-down slope to prevent reversal flow.• During drain piping connection, be careful not to exert extraforce on the drain port at the indoor unit.• The outside diameter of the drain connection at the indoorunit is 20 mm.In the case of left piping1. Remove both the internal and external plugs.2. Use a wrench or pliers to remove the plugs.• Putting substitution of rubber plug.Drain TestConfirm the drain water flows smoothly after connecting thedrain piping.• Pour water to about 1.5 liters for the drain confirmation fromthe air inlet part which should gradually flow into the drainpan.10.4.6. Heat insulation1. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over 100°C).Piping material: Polyvinyl chloride pipe VP-20 and pipe fittingsHeat insulation material: Polyethylene foam with thickness more than8mm (local supply).Be sure to perform heat insulation on the drain piping.Caution If insulation is insufficient, dew may form.This causes water leakage.Prevent the drain hose from floating and hangingCaution down.This causes water leakage. (down figure)Caution Be sure to perform heat insulation on the drain, liquid and gas piping. Imperfection in heat insulation work leads to water leakage.
