Hitachi UTOPIA R32 Series - 5.4 General Instructions on the Installation of Refrigerant Pipes

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PMEN0654 rev.0 - 12/2023
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GENERALINSTRUCTIONSONTHEINSTALLATIONOFREFRIGERANTPIPES
REFRIGERANT PIPING AND REFRIGERANT CHARGE
! CAUTION
• Secure the xed connecon with a suitable wrench and use a torque wrench to ghten the are
nut on the threaded connecons.
• Do not exceed the torque value indicated in the table. The ng can become misshapen and the
connecon may leak.
If temperature and humidity inside the ceiling exceed 27°C / RH 80%, dew condensaon occurs on
the surface of the accessory insulaon. Wrap addional insulaon (approx. 5 ~ 10mm thickness)
around the accessory insulaon of the refrigerant pipe as a prevenve measure.
For buried pipe with joints such as an elbow or a socket, provide service access doors to facilitate
the check for connecon.
The pipes must be reinforced by an earthquake resistant support so that they will not be damaged
by an external force.
Do not clamp the refrigerant pipe ghtly when supporng them for prevenon of heat stress.
When connecng indoor/outdoor units with refrigerant pipes, x the pipes as required so that the
pipes may not to contact weak porons of the wall, ceiling, etc. Failure to take this measure may
lead to an abnormal sound caused by the vibraon of the pipe.
Perform the air ght test according to Installaon and Operaon Manual of the outdoor unit.
Aer connecng the refrigerant piping, seal the open space between knockout hole and refrigerant
pipes by using insulaon material.
Unit side
N° Descripon

Insulaon material

Insulaon material

Field supplied

Insulaon material
5.4 General instrucons on the installaon of refrigerant pipes
5.4.1 Preparing copper refrigeraon pipes
Clean the area where the copper refrigeraon pipe preparaon work is to be carried out. It must
parcularly be free of waste, soil, wood or metal shavings and, in general, any substance that could
enter the ends of the pipe during handling. The copper pipe must be clean and have no remains of
adhesive, cement, dust or other substances adhered to it.
! CAUTION
• Before you install the pipes, blow the inside with oxygen-free nitrogen gas to eliminate any
remains of dust or other substances.