Daikin FDA125A5VEB - Guidelines When Installing the Drain Piping

16 | Unit installation
Installer and user reference guide
55
FDA125A5VEB
Split system air conditioners
4P495031-1B – 2022.10
e Aluminium tape (field supply)
▪ Fixing screws. When installing an air inlet duct, select fixing screws that stick out
5 mm on the inside of the flange to protect the air filter from damage during
maintenance of the filter.
a
b
c
5 mm
a Air inlet duct
b Inside of the flange
c Fixing screw
▪ Filter. Be sure to attach an air filter inside the air passage on the intake side. Use
an air filter with dust collecting efficiency ≥50% (gravimetric method). The
included filter is not used when the intake duct is attached.
▪ Air outlet side. Connect the duct according to the inside dimension of the outlet-
side flange.
▪ Air leaks. Wind aluminium tape around the intake side flange and duct
connection. Make sure there are no air leaks at any other connection.
▪ Insulation. Insulate the duct to prevent condensation from forming. Use glass
wool or polyethylene foam 25mm thick.
16.2.3 Guidelines when installing the drain piping
Make sure condensation water can be evacuated properly. This involves:
▪ General guidelines
▪ Connecting the drain piping to the indoor unit
▪ Checking for water leaks
General guidelines
▪ Drain pump. For this "high lift type", the drainage sounds will be reduced when
the drain pump is installed in a higher location. Recommended height is 300 mm.
▪ Pipe length. Keep drain piping as short as possible.
▪ Pipe size. Keep the pipe size equal to or greater than that of the connecting pipe
(vinyl pipe of 20mm nominal diameter and 26mm outer diameter).
▪ Slope. Make sure the drain piping slopes down (at least 1/100) to prevent air
from being trapped in the piping. Use hanging bars as shown.
1~1.5 m
a
a Hanging bar
Allowed
Not allowed
▪ Condensation. Take measures against condensation. Insulate the complete drain
piping in the building.