Hitachi SET FREE-Serie Bedienungsanleitung Seite 42

PIPING WORK AND REFRIGERANT CHARGE
8.3.5 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.
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2 pipes system
Front side
Bottom side
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3 pipes system
Front side
Bottom side
2 Operation of the stop valve should be performed according
the specified in this manual.
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.
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For heat pump systems (2 pipes)
For piping from bottom base
Control wiring
Transmission wiring
Power source wiring
Seal gaps with packings (field-
supplied). Install accessory rubber
32 PMML0479 rev.2 - 02/2018
Bottom side
Rear side
Bottom side
Rear side
Liquid pipe
Gas pipe
Front side
bushes to the wiring outlets.
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For heat recovery systems (3 pipes)
For piping from bottom base
Control wiring
Transmission wiring
Power source wiring
Seal gaps with packings (field-supplied)
Install accessory rubber bushes to the wiring outlets
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n o t e
• After removing the pipes and completing insulation work, cover the
gap between the base and the pipes with packing (field-supplied). If
the gap is not covered, the unit may be damaged if snow, rain water
or animals enter the unit.
• Fix the rubber bushes with adhesive when conduit tubes to the
outdoor unit are not used.
8.3.6 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.
Liquid pipe
High/Low pressure gas pipe
Low pressure gas pipe
Front side