Hitachi Primairy Series Installation & Maintenance Manual page 12

SAFETY PRECAUTIONS
Explanation of symbols displayed on the indoor unit or outdoor unit
WARNING
CAUTION
CAUTION
CAUTION
8 HO2019292HA
This symbol shows that this appliance uses a flammable refrigerant.
If the refrigerant is leaked and exposed to an external ignition source, there is a risk of fire.
This symbol shows that the operation manual should be read carefully.
This symbol shows that a service personnel should handle this equipment with reference to
the installation manual.
This symbol shows that information is available such as the operating manual or installation
manual.