Gas Valve - Hitachi SET FREE Serie Manual De Instalación Y Funcionamiento

Piping work and refrigerant charge

Stop valve
Follow the restrictions for refrigerant piping (permissible length,
height difference) according to the item
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 burn-
er. 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 compres-
sor with a metal plate when using a burner.
40
PMML0294A_rev.2_02-2014.indb 40
Piping Connection. If not,
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
PMML0294A rev.2 - 07/2014
Liquid valve
Tighten the flare nut for liquid stop valve according to the follow-
ing torque. If an excessive force is applied to the flare nut, the
refrigerant leakage may occur from the spindle part.
(Put two spanners as shown in the right figure when the piping is
removed and attached. If not, the refrigerant leakage may occur.)
HP Tightening Torque (N-m)
(5-12)
(14/16)
Do not put two spanners here.
Refrigerant leakage may occur.
Two spanners work Tightening work for stop valve (liquid)
Do not put two
spanners here
Flare nut
Put two spanners here
5 ~ 12 HP
C A U T I O N
• Do not apply an excessive force to the spindle valve after
fully opening the spindle. The back seat construction is not
provided.
• At the test run, fully open the spindle. If it is not fully opened,
the devices will be damaged.
33 - 42
50 - 62
Flare nut
14 / 16 HP
14/07/2014 12:28:26