Gas Valve - Hitachi RAS-8FSXN1E Manuel D'utilisation

PIPING WORK AND REFRIGERANT CHARGE
Piping direction
Fix the pipes adequately in order to avoid vibration and
excessive force to the valve.
1 The pipes can be installed in three directions (front, rear or
bottom side) from the bottom base. For vibration protection,
properly fix the piping connection and check that no
excessive force is applied to the stop valve.
Front side
Bottom base
2 Operation of the stop valve should be performed according
the specified in this manunal.
3 Connect the pipes according to the tables.
4 Completely seal the penetration part at the bottom of the
pipes with insulation in order to prevent rain water from
entering the conduit.
For heat pump systems (2 pipes)
For piping from bottom base
Liquid pipe
Gas pipe
Piping cover
(attached to unit)
Cover the gap
with insulations
For heat recovery systems (3 pipes)
For piping from bottom base
Liquid pipe
Gas pipe
Piping cover
(attached
to unit)
Cover the gap
with insulations
19 PMML0392B rev.1 - 07/2016
Rear side
Bottom side
For piping from front or rear side
piping cover
Cover the gap with a
packing (field-supplied)
Piping
cover
Liquid pipe
Gas pipe
For piping from front or rear side
piping cover
Cover the gap with a
packing (field-supplied)
Piping
Gas pipe Liquid pipe
cover

Stop valve
Follow the restrictions for refrigerant piping (permissible length,
height difference). If not, the outdoor unit may be damaged or
fail.
The stop valves shall be closed completely (factory setting)
when the refrigerant piping connection is performed. Do not
open the stop valves until all the refrigerant piping connections,
air-tight test and vacuuming have been completed.

Gas valve

1 Make sure that all the spindles are closed completely.
2 Connect the charging hose to the service port and release
the gas inside the piping from the high/low and low pressure
gas pipes.
3 Cut the end of the closing pipes and check that no gas exists
inside the high/low and low pressure gas pipes.
4 Remove the stop valve cover.
5 Remove the closing pipe from the brazing portion with a
burner. Pay attention to the flame from the burner not to burn
the stop valve body.
Stop valve for low
pressure gas pipe
End of closing pipe
Sound proof
cover
Compressor
Oil return pipe
Metal plate
Closing pipe
!
C A U T I O N
• Ensure that there is no gas inside the pipe when removing the closing
pipe. Otherwise, the pipe may be blown out and it may lead to injury.
• Protect the return oil pipe and vibration proof of the compressor with
a metal plate when using a burner.
Service port
Stop valve for
high/low pressure
gas pipe
Stop valve for
liquid pipe
Stop valve cover
Details of closing
pipe
Closing pipe
Cut
Stop valve
body
Field-work side
Burner