Daikin FWF02B7TV1B Installation Manual page 26

4 Install the fan coil unit
■ Keep piping as short as possible and slope it downwards at a gradient of at least 1/100 so
that air does not remain trapped inside the pipe. Refer to
page 21.
If the drain hose cannot be sufficiently set on a slope, fit the drain hose with a drain
raising piping (field supply) as illustrated in the figure below.
d
Fig. 4.17: How to perform drain piping
a
b
c
d
e
■ Keep pipe size equal to or greater than that of the connecting pipe (20 mm inner
diameter).
■ Install the drain raising pipes at a height of less than 545 mm.
■ Install the drain raising pipes at a right angle to unit and no more than 300 mm from the
unit.
■ To prevent air bubbles, install the drain hose level or slightly tilted up (≤75 mm).
■ Insulate the complete drain piping inside the building.
Information
When unifying multiple drain pipes, install the pipes as illustrated in the figure
below. Select converging drain pipes whose size is suitable for the operating capacity
of the unit.
Fig. 4.18: Unifying multiple drain pipes
a
Perform the drain piping work
Installation manual
22
≤300
e d
Ceiling slab
Hanger bracket
Drain raising pipe (nominal diameter = 20 mm)
Drain hose (delivered with the unit)
Metal clamp (delivered with the unit)
T-joint converging drain pipes
"Drain pipe installation" on
a
1~1.5 m
b
c
a
a
a
a
FWF
Fan coil units
4PW64524-1 – 09.2010