Daikin C Series Installation Manual page 9

Ceiling Concealed Drain Piping Work
• The drain pipe must be installed as shown in the diagram (see diagram above) to avoid damage caused by leaks and
condensation.
• For the best result, keep the piping as short as possible. Slant the piping at an angle to improve the flow.
• Ensure the drain pipe is securely insulated.
• It is necessary to provide a drain trap in the drain outlet to relieve pressure that exists within the unit compared to the outside
atmospheric pressure when the unit is operating. The drain trap is to avoid possibility of splashes or an odor.
• Keep pipes as straight as possible for easy cleaning and to prevent the accumulation of dirt and debris.
• Conduct a water drainage test after the installation is completed. Make sure that the drainage flow is smooth.
• In humid environments, use an extra drain pan to cover the entire area of the indoor unit.
• The indoor unit is equipped with water outlet and inlet connection. There is an air-vent that is fitted along with the connection
for air purging.
• 3 way valve is required for cycling off or bypass the chilled water.
• Black steel pipe, closed cell polyurethane pipe and copper tube are recommended in the field installation. All types of
piping and connection must be insulated with closed cell polyurethane to avoid condensation.
• Do not use contaminated or damaged pipe and fitting for installation.
• Some main fitting components are needed in the system to enhance the capacity and ease of service, such as gate valve,
balancing valve, 2 way or 3 way valve, filter, strainer and etc.
Chiller
Insulate securely
WATER PIPING CONNECTION
Gate Valve
Three Way Valve
FCU
Gate Valve
Good Controlling Bad Controlling
1-7
Bottom of
the unit
Drain
trap
Do not leave in water
Gate Valve
Two Way Valve
Gate Valve
FCU
Gate Valve
Gate Valve
Unit : mm
FCU
Worst Controlling