Drain Piping Work - Daikin VRV FXDQ20A2VEB Installation Manual

7.

DRAIN PIPING WORK

CAUTION
• Make sure all water is out before making the duct connection.
(1) Install the drain piping.
Refrigerant pipes
Service drain hole
(with rubber cap)
• Make sure the drain works properly.
• The diameter of the drain piping should be greater than or
equal to the diameter of the connecting pipe (vinyl tube; pipe
size: 20 mm; outer dimension: 26 mm).
(not including the riser)
• Keep the drain piping short and sloping downwards at a gra-
dient of at least 1/100 to prevent air pockets from forming.
(Refer to Fig. 10)
CAUTION
Water accumulating in the drain piping can cause the
drain to clog.
• To keep the drain piping from sagging, space hanging
bracket every 1 to 1.5 m.
• Use the drain hose (2) and the metal clamp (1). Insert the
drain hose (2) fully into the drain socket and firmly tighten the
metal clamp (1) with the upper part of the tape on the hose
end. Tighten the metal clamp (1) until the screw head is less
than 4 mm from the hose. (Refer to Fig. 11, 12)
• The two areas below should be insulated because conden-
sation may form there causing water to leak.
• Drain piping passing indoors
• Drain socket
Referring the figure below, insulate the metal clamp (1) and
drain hose (2) using the included large sealing pad (5).
(Refer to Fig. 12)
English
Drain socket
Central drain piping
(with a slope of at least 1/100)
Fig. 10
Metal clamp (1)
(accessory)
Tape Drain hose (2)
(accessory)
Fig. 11
 PRECAUTIONS FOR DRAIN RAISING PIPE 
• Make sure the drain raising pipe height is no higher than
600mm.
• Place the drain raising pipe vertically and make sure it is no
further than 300mm from the unit. (Refer to Fig. 13)
Ceiling slab
300 mm or less
Metal clamp (1) (accessory)
Drain hose (2) (accessory)
Drain hose (2) (accessory)
Locate the drain hose horizontally
or with a little upward gradient.
If there is an air bank, noise may be generated
as a result of a water backflow when the drain
pump comes to a stop.
 PRECAUTIONS 
Drain piping connections
• Do not connect the drain piping directly to sewage pipes that
smell of ammonia. The ammonia in the sewage might enter
the indoor unit through the drain piping and corrode the heat
exchanger.
• Do not twist or bend the drain hose (2), so that excessive
force is not applied to it.
(This type of treatment may cause leaking.)
• If you are using central drain piping, follow the procedure
outlined in the figure 10.
• Select central drain piping of proper size according to the
capacity of the connected unit.
(2) After piping work is finished, check drainage flows
smoothly, with manner described below.
CAUTION
• The electric wiring work shall be performed by qualified elec-
tricians.
• If workers not having the electrician qualification have per-
formed the electric wiring work, the steps 3 to 7 shall be per-
formed after the TEST RUN.
Large sealing
pad (5)
(accessory)
Metal clamp (1)
(accessory)
≤4mm
Fig. 12
1 – 1.5m
Hanging bracket
Adjustable range
(600mm or less)
Drain raising pipe
(Field supply)
Horizontal or
upward slope
Fig. 13
7