Refrigerant Pipe Selection - Hitachi RCI-1.0FSN4 Service Manual

3 Piping work and refrigerant charge

Refrigerant pipe selection

3.1 Refrigerant pipe selection
3.1.1 Refrigerant pipe selection
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N O T E
Consult the corresponding Technical Catalogue for outdoor units from the UTOPIA or SET FREE Series.
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Pipe size selection
Select the pipe size in line with the following instructions:
1 Between the outdoor unit and the branch pipe (multi-kit): select the same pipe connection size as for the outdoor unit.
2 Between the branch pipe (multi-kit) and the indoor unit: select the same pipe connection size as for the indoor unit.
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C A U T I O N
• Do not use refrigerant pipe sizes other than those indicated in the corresponding Technical Catalogue for outdoor units. The diameter
of the refrigerant pipes depends directly on the power of the outdoor unit.
• If larger diameter refrigerant pipes are used, the circuit lubrication oil tends to separate from the gas carrying it. The compressor will
be seriously damaged due to a lack of lubrication.
• If smaller diameter refrigerant pipes are used, the gas or liquid refrigerant will have serious difficulties in circulating. System performance
will be affected. The compressor will run under more severe conditions than foreseen and will be damaged in a short space of time.
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Multi-kit or distributor selection
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N O T E
• Pipe connection sizes on outdoor units, indoor units and the multi-kit or distributor vary depending on the system. Consult the Service
Manual for the UTOPIA or SET FREE Series.
• The sizes of the indoor and outdoor units are different. Adjust the flare adapter (accessory) to the indoor pipe connection.
96 SMGB0099 rev.0 - 12/2016