Drain Piping Work - Daikin FHA70AVEB Installation Manual

• After piping is finished, cut the removed penetration
cover along the shape of piping, and install it.
Also, for top panel penetration cover, as it was before
removed, put the horizontal blade motor and thermistor
lead through the clamp of the top panel penetration cover
and fix. (Refer to Fig. 16 and Fig. 19)
When doing this, block any gaps between the piping pen-
etration cover and the piping using putty field supply to
prevent dust from entering the indoor unit.
Top panel penetration
cover clamp part
View from air inlet side
* Before brazing refrigerant piping, have nitrogen flow through
the refrigerant piping and substitute air with nitrogen. Then,
carry out brazing (NOTE 2). (Refer to Fig. 20) After all the
brazing works are finished, carry out flare connection with the
indoor unit.
Brazing place
Nitrogen
Refrigerant piping
NOTE NOTE NOTE NOTE
1. The proper pressure for having nitrogen flow through the
piping is approximately 0.02MPa, a pressure that makes
one feel like breeze and can be obtained through a pres-
sure reducing valve.
2. Do not use flux when brazing refrigerant piping. Use phos-
phor copper brazing filler metal (BCuP-2: JIS Z 3264/B-
Cu93P-710/795: ISO 3677) that does not require flux. (If
chlorinated flux is used, the piping will be corroded and, in
addition if fluorine is contained, the refrigerant oil will be
deteriorated and the refrigerant circuit will be affected
badly.)
3. When carrying out leakage test of refrigerant piping and the
indoor unit after the installation of indoor unit is finished,
confirm the connecting outdoor unit installation manual for
test pressure. Refer to also the outdoor unit installation
manual or technical document for refrigerant piping.
4. In case of refrigerant shortage due to forgetting additional
refrigerant charge etc., it will result in malfunction such as
does not cool or does not heat. Refer to the outdoor unit
installation manual or technical document for refrigerant
piping.
CAUTION
Do not use antioxidant when brazing piping.
It may result in malfunction of components and clogging of
piping due to residue.
English
Horizontal blade motor lead
Thermistor lead
Fig. 19
Pressure reducing valve
Taping
Stop valve
Nitrogen
Fig. 20
7.

DRAIN PIPING WORK

(1) Carry out drain piping.
• Carry out drain piping so that drainage is ensured.
• Drain piping can be connected from the following direc-
tions: For right rear/right side, refer to Fig. 18 of ''6.
REFRIGERANT PIPING WORK'', and for left rear/left
side, refer to Fig. 21.
• When conducting left rear/left side drain piping, remove
the protection net. Then, remove the drain socket cap
and insulation material applied to left side drain socket
and apply them to the right side drain socket. When doing
this, insert the drain socket cap all the way in to prevent a
water leakage.
After the drain hose (1) (accessory) installing, attach the
protection net by reversing the steps taken to remove it.
(Refer to Fig. 22)
• Select the piping diameter equal to or larger than that of
the drain hose (1) (accessory) (polyvinyl chloride piping,
nominal diameter 20mm, outside diameter 26mm).
• Install the drain piping as short as possible with down-
ward inclination of 1/100 or more by avoiding air stagna-
tion. (Refer to Fig. 23 and Fig. 24)
(It may cause abnormal sound such as bubbling noise.)
Left rear side
Drain piping
Back side (sheet metal)
Detach parts
Fixing
screw for
protection net
Fig. 22
Good
Fig. 23
Do not lift
Wrong
Fig. 24
Putty or insulation
(field supply)
Left side
Drain piping
Left side
Detach parts
Fig. 21
Protection net
Supports
1-1.5m
Downward inclination of 1/100 or more
Make sure there is no slack
Make sure it is not in the water
9