13 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
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 phosphor 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 malfunc-
tion such as does not cool or does not heat. Refer to the outdoor unit installation manual or technical doc-
ument 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.
Thermistor lead
Horizontal blade motor lead
Top panel penetration
cover clamp part
Fig. 19
View from air inlet side
Pressure reducing valve
Brazing place
Taping
Stop valve
Nitrogen
Nitrogen
Refrigerant piping
Fig. 20
01_EN_3P249378-8N.fm Page 13 Saturday, September 29, 2012 3:02 PM
To Next Page
Loading...
Need help?
General
