Daikin VRV II Series Design, Installation & Testing Instructions page 47

Si39-303
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(PRECAUTIONS FOR DRAIN RAISING PIPING)
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2. After piping work is finished, check drainage flows smoothly.
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WHEN ELECTRIC WIRING WORK IS FINISHED
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General Information
Insulate the drain hose inside the building.
Install the drain raising pipes at a height of less than 310 mm.
Install the drain raising pipes at a right angle to the indoor unit and no more than 300 mm from the unit.
If converging multiple drain pipes, install according to the procedure shown below.
Select converging drain pipes whose gauge is suitable for the operating capacity of the unit.
Open the water inlet lid, add approximately 2500 cc of water gradually and check drainage flow.
Check drainage flow during COOL running, explained under "TEST OPERATION".
Installation
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