Hitachi SET FREE Serie Manual De Instalación Y Funcionamiento página 35

Piping work and refrigerant charge
Always use clean copper pipes with no signs of knocks or cracks.
Make sure there is no dust or dampness on the inside. Before
you install the pipes, clean the inside with oxygen-free nitrogen
gas to eliminate any remains of dust or other substances.
C A U T I O N
• Do not use hand saws, circular saws, abrasive grinders or
other tools that generate shavings.
• Strictly follow national or local regulations regarding occupa-
tional health and safety.
• Wear appropriate means of protection during cutting or braz-
ing operations and installation (gloves, eye protection, etc).
On completing the installation of the refrigerant pipes -B-, insu-
late them appropriately using suitable insulating material -A- and
seal the open space between the holes made and the pipe, as
shown in the figure.

Pipe connection
Cover the end of the pipe appropriately when it is to be inserted
through holes in walls and roofs, etc.
Keep the ends of the pipes covered while other installation work
is being carried out to avoid the entry of dampness or dirt.
Do not place the pipes directly on the ground without appropriate
protection or adhesive vinyl tape to cover the ends.
Where the pipe installation is not completed for a certain amount
of time, braze the ends of the pipe to seal. Then fill it with oxygen-
free nitrogen gas through a Schrader valve to avoid the accumu-
lation of humidity and/or contamination through dirt.
N O T E
• Where polyethylene foam insulation is used, a 10 mm thick
layer should be used for the liquid pipe and between 15 and
20 mm for the gas pipe.
• Install the insulation after the pipe surface temperature has
dropped to the same temperature as that of the room, other-
wise the insulation may melt.
Do not use insulating material that contains NH
it could damage the copper in the pipe and subsequently cause
leaks.
Where the fitter has supplied his own branches, these should be
appropriately insulated to avoid decreases in capacity in line with
to environmental conditions and dew on the surface of the piping
due to low pressure.
21
PMML0294A_rev.2_02-2014.indb 21
(ammonium), as
3
PMML0294A rev.2 - 07/2014

Dimensions of flared pipe
øA
0.4-0.8R
ø d
Perform the widening operations in accordance with the meas-
urements shown below.
Not possible to perform the widening using pipe. In this case,
(1)
use a connection with flare fitting.

Selection of the connection with flare fitting
It is not possible to perform the widening operation, if copper is
used in pipes. In this case, use a connection with flare fitting.
Minimum thickness of the connection
Diameters (mm)
ø6.35
ø9.52
ø12.7
ø15.88
ø19.05
ø22.2
ø25.4
ø28.58
ø31.75
ø38.1
ø43.3
ø44.5
A
R410A
0.5
0.6
0.7
0.8
0.8
0.9
0.95
1.0
1.1
1.35
1.45
1.55
14/07/2014 12:28:11