Hitachi RAS-8FSXNS2E Installation & Operation Manual page 45

• 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.
• 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).
• Check the specific torques for the flared connections.
• While brazing, apply a flow of nitrogen gas inside the pipe.
• Fully insulate the refrigerant pipes.
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 pressure gas stop valve (1 part) 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 (2 parts) are
removed firstly.
!
DANGER
• 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.
PMML0628 rev.0 - 05/2023
3
38