Guidelines When Installing The Drain Piping - Daikin FXFQ20BVEB Installation And Operation Manual

4 Installation
▪ Level. Make sure the unit is level at all 4 corners using a level or a
water-filled vinyl tube.
a b b
a Level
b Vinyl tube
c Water level
NOTICE
Do NOT install the unit tilted. Possible consequence: If
the unit is tilted against the direction of the condensate flow
(the drain piping side is raised), the float switch might
malfunction and cause water to drip.
4.1.2 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
▪ 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 25 mm nominal diameter and
32 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
O Allowed
X Not allowed
▪ Rising piping. If necessary to make the slope possible, you can
install rising piping.
▪ Drain hose inclination: 0~75 mm to avoid stress on the piping
and to avoid air bubbles.
▪ Rising piping: ≤300 mm from the unit, ≤675 mm perpendicular
to the unit.
a b
≤300
a
b
a Metal clamp (accessory)
b Drain hose (accessory)
c Rising drain piping (vinyl pipe of 25 mm nominal diameter
and 32 mm outer diameter) (field supply)
Installation and operation manual
6
c
1000~1500
c d d
(mm)
d Hanging bars (field supply)
▪ Condensation. Take measures against condensation. Insulate
the complete drain piping in the building.
▪ Combining drain pipes. You can combine drain pipes. Make
sure to use drain pipes and T-joints with a correct gauge for the
operating capacity of the units.
a T-joint
To connect the drain piping to the indoor unit
NOTICE
Incorrect connection of the drain hose might cause leaks,
and damage the installation space and surroundings.
1 Push the drain hose as far as possible over the drain pipe
connection.
2 Tighten the metal clamp until the screw head is less than 4 mm
from the metal clamp part.
3 Check for water leaks (see
page 6).
4 Install the insulation piece (drain pipe).
5 Wind the large sealing pad (= insulation) around the metal
clamp and drain hose, and fix it with cable ties.
6 Connect the drain piping to the drain hose.
1 2~6
a b e
4
1
A-A'
a Drain pipe connection (attached to the unit)
b Drain hose (accessory)
c Metal clamp (accessory)
d Large sealing pad (accessory)
e Insulation piece (drain pipe) (accessory)
f Drain piping (field supply)
To check for water leaks
The procedure differs depending on whether electrical wiring is
already finished. When electrical wiring is not finished yet, you need
to temporarily connect the user interface and power supply to the
unit.
When electrical wiring is not finished yet
1 Temporarily connect electrical wiring.
a
(mm)
"To check for water leaks" on
c d f
2 5 6
A
A
A'
A'
≤4 mm
d
c
3
b
a
FXFQ20~125BVEB
VRV system air conditioner
4P540926-1B – 2019.01