9
English
•
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.
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 pressure
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 techni-
cal 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.
7.
DRAIN PIPING WORK
(1) Carry out drain piping.
•
Carry out drain piping so that drainage can ensured.
•
Drain piping can be connected from the following directions:
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 insu-
lation 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 pro-
tection 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 downward
inclination of 1/100 or more and without where air may stag-
nate.
(Refer to Fig. 23 and 24)
(It may cause abnormal sound such as bubbling noise)
CAUTION
If drain stagnates in the drain piping, the piping may be
clogged.
•
Make sure to use the attached drain hose (1) and metal
clamp (2). Also, insert the drain hose (1) into the root of the
drain socket, and tighten the metal clamp (2) at the root of the
drain socket tightly.
(Refer to Fig. 25 and 26)
(Install the metal clamp (2) so that the tightening part is in the
range of about 45°as shown in the
Fig. 26
.)
(Do not bond the drain socket and drain hose. If so, mainte-
nance and inspection for the heat exchanger and others can-
not be conducted.)
CAUTION
If an old drain hose or an elbow or a clamp is used, it may
cause water leakage.
Pressure reducing valve
Brazing place
Taping
Stop valve
Nitrogen
Nitrogen
Refrigerant piping
Fig. 20
Back side (sheet metal)
Detach parts
Putty or insulation
(field supply)
Left side
Drain piping
Left side
Detach parts
Left rear side
Drain piping
Fig. 21
Protection net
Fixing
screw for
protection net
Fig. 22
Good
Wrong
Supports
1-1.5m
Downward inclination
of 1/100 or more
Do not lift
Make sure there
is no slack
Make sure it is
not in the water
Fig. 23
Fig. 24
01_EN_3P368557-2D.fm Page 9 Wednesday, February 13, 2019 2:46 PM
