Daikin REYQ96MTJU, Инструкция по проектированию, установке и испытаниям, Страница: 32 / 236

Installation Si39-406
26 General Information
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 127.
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.
Flare Connection (a) Stiffened pipe must always be annealed at least once prior to the flaring work.
(b) A pipe cutter must be used to cut the pipe. (A large pipe cutter must be used where the pipe has
a large diameter. When cutting a pipe which is too big for the pipe cutter a metal saw may be
used but care must be taken to ensure that the debris from sawing does not get into the pipe.)
(c) Set the flaring tool to make sure the flare size remains within the prescribed limits.
Copper pipe support spacing (From HASS 107-1977)
Nominal diameter
φ
1/2 or less
φ
7/8
Maximum gap (Inch) 40 60
Nominal diameter External diameter of pipe d
(mm)
Pipe widening dimensions A
(mm)
1/4 6.35 9.1
3/8 9.52 13.2
1/2 12.7 16.6
5/8 15.88 19.7