Daikin SkyAir Super Inverter 70 D Series, Руководство по обслуживанию

Страница: 41 / 255

Field Piping and Wiring SiE25-110
32 Field Piping and Wiring
1. Field Piping and Wiring
1.1 Precautions
Caution to be Taken When Brazing Refrigerant Piping
“Do not use flux when brazing copper-to-copper refrigerant piping. (Particularly for the HFC
refrigerant piping) Therefore, use the phosphor copper brazing filler metal (BCuP) which does
not require flux.”
(Flux has extremely harmful influence on refrigerant piping systems. For instance, if the chlorine
based flux is used, it will cause pipe corrosion or, in particular, if the flux contains fluorine, it will
damage the refrigerant oil. The use of flux is strictly forbidden since the cleaning on site is
impossible.)
(Caution) Keep in mind that if the phosphor copper brazing filler metal is used and the
brazing temperature and the heating time exceed a certain point, the phosphor
changes into the gaseous state (e.g. BCuP -1 to 5 : between 700 and 800C) which
causes pin holes and results in refrigerant leakage.
R-407C applies higher pressure than R-22 and uses
refrigeration oil different from R-22. Therefore, piping
works and tools are also different from those for R-22
refrigerants.
Use C1220 type copper tube for refrigerant piping. Wall thickness
of copper tube shown in the below table can be applied.
(The table is same as the recommendation for R-22)
Refrigeration oil
Condensing pressure
Mineral oil (Suniso)
Refrigerant
R-22
(Single-component refrigerant)
1.84MPa (18.8kg/cm 2 )
Synthetic (ether) oil
R-407C
(Multiple-component refrigerant)
2.01MPa (20.5kg/cm 2 )
Refrigerant Piping Materials
Other refrigerant piping materials
Recommendable oil for pipe processing
DAPHNE MASTER DRAW 510LS·530LS·565NR·566LS
(Idemitsu Kosan Co.,Ltd.)
MASTER DRAW 5128
(ETNA PRODUCTS INC.)
Shell Drawing XA
(SHELL)
* Mixing amount of oil is 30 mg/10m at maximum.
Copper tube O.D.
Type O type
Copper tube W.T.
9.5
0.8
15.9
1.0
19.1
1.0
* When select and use a copper tube, observe strictly the relevant standards or regulations of each country.
(As of March 2001)
(Unit : mm)