Daikin FAQ18TAVJU - Drain Piping Work

9
English
• When brazing the refrigerant piping, carry out nitrogen
substitution (inserting nitrogen into the refrigerant piping to
substitute air with nitrogen (refer to NOTE below)) and
then begin brazing. Once this is done, connect the indoor
unit with a are connection.
DANGER
• Use of oxygen may cause an explosion resulting in seri-
ous injury or death. Only use nitrogen gas.
NOTE
• Set nitrogen pressure to about 2.9 psi (0.02 Mpa) with a
pressure-reducing valve if brazing while inserting nitrogen
into the piping. (Refer to Fig. 14)
Refrigerant piping
Part to be
brazed
Taping
Pressure-reducing valve
Hand valve
Nitrogen
Fig. 14
Nitrogen
• After checking for gas leaks, be sure to insulate the pipe
connections using the piping insulating tube and insulating
tape (4). The insulating tape (4) should be wrapped from
the L-shaped bend all the way to the end inside the unit.
(Refer to Fig. 15)
Indoor unit piping insulating
tube
Tape of insulating tube
Seam of Insulating tube
Attach the tape of insulating tube
so that there are no gaps in the
seam of insulating tube.
Fig. 15
Tape of insulating tube
Tape of insulating tube
Field piping
Indoor unit
piping
Indoor unit piping
insulating tube
Clamp (large)
(accessory) (5)
L-shaped
bend
Start wrapping
See “ 4. INDOOR UNIT
INSTALLATION ”
Insulating tape
(accessory) (4)
CAUTION
• Be sure to insulate the eld piping all the way to the piping
connection inside the unit. Any exposed piping may cause
condensate or burns if touched.
6. DRAIN PIPING WORK
(1) Install the drain piping. (Refer to Fig. 16)
• The drain pipe should be short with a downward slope
and should prevent air pockets from forming.
• Watch out for the points in Fig. 16 when performing
drain work.
Fig. 16
Make sure the drain
hose is at a downward
slope.
Make sure the tip is
not under water even
when flooding.
Drain hose Drain hose
(Downward
slope)
• When extending the drain hose, use a commercially
available drain hose for extension, and be sure to
insulate the extended section of the drain hose which
is indoors. (Refer to Fig. 17)
Indoor unit
drain hose
Drain hose for extension
(field supply)
Insulating tube
(field supply)
Insulating tape (accessory) (4)
( See “4. INDOOR UNIT INSTALLATION” )
Fig. 17
• Make sure the diameter of the drain hose for exten-
sion is the same as the indoor unit drain hose (hard
vinyl chloride, I.D. 1/2 in. (13 mm)) or larger.
• In case of converging multiple drain hoses, install
them referring to Fig. 18.
• Select diameter of drain hose which adapts to the
capacity of the unit connected.
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