Daikin VRV II Series, Инструкции по проектированию, установке и тестированию, Страница: 29 / 242

Si39-303 Installation
General Information 23
Brazing
a) Brazing work should be carried out such that the final result is directed either downwards or sideways.
An upward direction should be avoided wherever possible. (to prevent leakage)
b) Liquid and gas pipe branches should always be dealt with in the specified way with attention being paid
to the direction of the fitting and its angle. (to prevent oil return or drift) For example see page 148.
c) It is standard working practice to use the nitrogen replacement method when brazing.
Important points
1. Every effort must be made to avoid fire. (Clean area where brazing is to be performed and make sure
that fire fighting equipment and water are ready to hand.)
2. Be careful of burns.
3. Make sure that the gap between the pipe and the joint is correct. (To prevent leaks)
4. Is the pipe adequately supported?
!
As a rule the gaps between supports for horizontal piping (copper pipe) are as follows:
!
The copper pipe should not be secured directly by metal brackets.
Copper pipe support spacing (From HASS 107-1977)
Nominal diameter 20 or less 25~40 50
Maximum gap (m) 1.0 1.5 2.0