Hitachi SET FREE-Serie Bedienungsanleitung Seite 49

PIPING WORK AND REFRIGERANT CHARGE
Stop valve (Liquid)
Flaring
(in the field)
Liquid pipe (Ø12.7)
(field-supplied)
Adapter (field-supplied)
Gas "high/low pressure" pipe
(Ø22.2) (field-supplied)
Stop valve (Liquid)
Flaring
(in the field)
Liquid pipe (Ø15.88)
(field-supplied)
Adapter (field-supplied)
Gas "high/low pressure" pipe
(Ø22.2) (field-supplied)
( ** ) example of options for brazing the pipes at this point
Expand
(in the field)
Special care should be taken to ensure that the flame from the
blow torch does not fall on the body of the stop valve, on the
compressor and cover or on the insulation bushings; insert a
metal plate in front of the oil return pipe: see on section
Stop valve".
Connect the indoor units to the outdoor units using copper pipes
specifically for use with refrigerant. When laying the pipes make
sure that they do not directly rest on or touch walls or other parts
of the building (when the refrigerant is flowing through the pipes,
this could cause strange noises).
Specific torques for the flared connections: see on section
"Details of stop valves".
While brazing, apply a flow of nitrogen gas inside the pipe.
Fully insulate the refrigerant pipes.
39 PMML0479 rev.2 - 02/2018
ras-14fsXnPe
Stop valve
(High/low pressure gas)
Stop valve
(Low pressure gas)
Adapter (field-supplied)
Gas "low pressure" pipe
(Ø25.4) (field-supplied)
90º Elbow (field-supplied)
Gas "low pressure" pipe
(Ø25.4) (field-supplied)
ras-18fsXnPe
Stop valve
(High/low pressure gas)
Stop valve
(Low pressure gas)
Adapter (field-supplied)
Gas "low pressure" pipe
(28.58) (field-supplied)
90º Elbow (field-supplied)
Gas "low pressure" pipe
(Ø28.58) (field-supplied)
Accessory pipe
Adapter
(field-supplied).
Liquid pipe
(field-supplied)
"8.3.6
ras-16fsXnPe
Stop valve
(High/low pressure gas)
Stop valve (Liquid)
Flaring
(in the field)
Accessory pipe
OD15.88OD12.7
(**)
Adapter (field-supplied)
Gas "low pressure" pipe
(Ø22.2) (field-supplied)
Liquid pipe (Ø12.7) (field-supplied)
Gas "high/low pressure" pipe
(Ø22.2) (field-supplied)
( * ) if longer piping is needed add the following
Adapter (field-supplied).
Gas pipe
(field-supplied)
!
D a n G e r
• Check that the gas and liquid stop valves are fully closed.
• Check that there is no gas inside the pipe before removing
the stop pipe. Otherwise, the pipe may explode when
heated with the blow torch.
For heat pump systems (2 pipes)
• Refer to the Accessories factory-supplied for the details of the
accessory pipes.
• Ensure that the closing pipes of the high/low and low
pressure gas stop valves (2 parts) are removed firstly.
For heat recovery systems (3 pipes)
• Refer to the Accessories factory-supplied for the details of the
accessory pipes.
• Ensure that the closing pipes of the high/low and low
pressure gas stop valves (1 parts) are removed firstly.
Stop valve
(Low pressure gas)
Gas "low pressure" pipe
(Ø28.58) (field-supplied)
90º Elbow (field-supplied)
Gas "low pressure" pipe
(Ø28.58) (field-supplied)