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PMEN0654 rev.0 - 12/2023
10
IMPORTANT CONSIDERATIONS
CHARGING WORK
10.1 Important consideraons
Appropriate refrigerant
The refrigerant used in each unit is idened on the specicaon label and manuals of the unit.
Hitachi shall not be held liable for any failure, trouble, malfuncon or accident caused by units
illegally charged with refrigerants other than the specied one.
Consequences of charging non-specied refrigerant
It may cause mechanical failure, malfuncon and other accidents.
It may cause operaonal failure of protecon and safety devices of air condioners.
It may also cause lubricaon failure of the sliding part of the compressor due to deterioraon of
refrigerant oil.
In parcular, hydrocarbon refrigerants (such as propane, R441A, R443A, GF-08, etc.) are not
allowed, since these are combusble and may cause major accidents such as re and explosion in
case of improper handling.
Once a non-specied refrigerant has been charged, no further servicing (including draining of
refrigerant) shall be performed, even in case of malfuncon. Improper handling of refrigerant may
be a cause of re and explosion, and servicing in such cases may be considered an illegal act.
End clients and costumers shall be informed that servicing is not approved, and the installer who
charged the non-specied refrigerant shall be asked to x the unit.
Hitachi will accept no responsibility for units that have been charged with non-specied refrigerant
once.
! DANGER
Use refrigerant R32 according to the outdoor units model in the refrigerant cycle. Do not charge
oxygen, acetylene or other ammable and poisonous gases into the refrigerant cycle when
performing a leakage test or an air-ght test. These types of gases are extremely dangerous and
can cause an explosion. It is recommended that compressed air, nitrogen or refrigerant be used
for these types of test.
• Aer vacuum pumping work, keep the gas valve and liquid valve fully closed.
• Check if the system needs an addional charge of refrigeraon.
• If the total refrigerant amount of the system is insucient, charge the addional refrigerant,
which amount is calculated, from the check joint of the liquid valve. (Addional refrigerant
tolerance shall be +0.5 kg.) according to follows:
✓ Fully open the gas valve.
✓ For charging refrigerant, connect the gauge manifold using charging hoses with a refrigerant
charging cylinder to the check joint of the liquid line stop valve.
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