Daikin FXMQ15TBVJU Installation Manual page 12

< Caution to be taken when carrying out upward
drain piping (Refer to Fig. 16) >
• The maximum height of the drain riser is 26-9/16 in.
(675 mm). Since the drain pump mounted on this
indoor unit is a high head type, from the characteristic
point of view, the higher the drain riser the lower the
draining noise.
Therefore, the drain riser of 11-13/16 in. (300 mm) or
higher is recommended.
• For upward drain piping, keep the horizontal piping
distance of 11-13/16 in. (300 mm) or less between the
drain socket root to the drain riser.
Ceiling slab
11-13/16
(300)
or less
Adjustable
(26-9/16 (675) or less)
Metal clamp (1)
(Accessory)
Drain hose (2)
(Accessory)
Keep the drain hose level or make a slight up-grade so
that air may not stagnate in the drain hose (2).
If air stagnates, the drain may flow oppositely when
the drain pump stops and generate abnormal sound.
Fig. 16
11
40-60
Support
(1000-1500)
Upward drain piping
(Field supply)
unit: in. (mm)
Drain hose (2)
(Accessory)
Level or upward
inclination
CAUTION
• To avoid the attached drain hose (2) getting excessive
force, do not bend nor twist it.
It may cause water leakage.
• As for drain piping connection, do not connect the drain
hose directly to a sewage that gives off ammonia odor.
(The ammonia in the sewage may go through the drain
piping and corrode the heat exchanger of the indoor
unit.)
• In case of centralized drain piping, carry out piping work
according to the procedure shown in the fol lowing
Fig. 17.
Centralized drain piping
Make a downward inclination of 1/100
or more to avoid stagnation of air.
If water stagnates in the drain
piping, it may cause clogging of
drain piping.
Fig. 17
• As for the size of centralized drain piping, select the
size that meets the capacity of indoor units to be con-
nected. (Refer to the technical document.)
• Positioning the upward drain piping at an angle may
cause float switch malfunction and lead to water leakage.
• While replacing with new indoor unit, use the attached
new drain hose (2) and the metal clamp (1).
If an old drain hose or a metal clamp is used, it may
cause water leakage.
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