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PMEN0643 rev.0 - 04/2023

GENERAL NOTES BEFORE PERFORMING PIPING WORK

REFRIGERANT AND WATER PIPING

5.1 General notes before performing piping work

• Prepare locally-supplied copper pipes.

• Select the piping size with the correct thickness and correct material able to withstand sucient

pressure.

• Select clean copper pipes. Make sure that there is no dust or moisture inside the pipes. Blow

the inside of the pipes with oxygen free nitrogen to remove any dust and foreign materials

before connecng them.

 NOTE

A system with no moisture or oil contaminaon will give maximum performance and lifecycle

compared to that of a poorly prepared system. Take parcular care to ensure that all copper piping

is clean and dry internally.

• Cap the end of the pipe when pipe is to be inserted through a wall hole.

• Do not put pipes on the ground directly without a cap or vinyl tape at the end of the pipe.

• If piping installaon is not completed unl next day or over a longer period of me, braze o the

ends of the piping and charge with oxygen free nitrogen through a Schrader valve type access

ng to prevent moisture and parcle contaminaon.

• It is advisable to insulate the water pipes, joints and connecons in order to avoid heat loss and

dew condensaon on the surface of the pipes or accidental injures due to excessive heat on

piping surfaces.

• Do not use insulaon material that contains NH

, as it can damage copper pipe material and

become a source of future leakage.

• It is recommended to use exible joints for the water piping inlet and outlet in order to avoid

vibraon transmission.

• Refrigerant circuit and Water circuit must be performed and inspected by a licensed technician

and must comply with all relevant European and naonal regulaons.

• Proper water pipe inspecon should be performed aer piping work to assure there is no water

leakage in the space heang circuit.

5.2 R32 Refrigerant circuit

5.2.1 General notes R32 refrigerant

This appliance is lled with R32, an odourless ammable refrigerant gas with low burning velocity

(A2L class pursuant to ISO 817). If the refrigerant is leaked, there is a possibility of ignion if it

enters in contact with an external ignion source.

Make sure that unit installaon and refrigerant piping installaon comply with applicable legislaon

in each country. Also, in Europe, EN378 must be complied, as it is the applicable standard.

Hitachi YUTAKI S Series Installation And Operation Manual

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