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SAFETY
1. SAFETY
1.1 Applied symbols
During normal air conditioning system design work or
unit installation, greater attention must be paid in certain
situations requiring particular care in order to avoid inju-
ries and damage to the unit, the installation, the building
or to those in the surrounding area. These situations will
be clearly indicated in this manual.
Signal words (NOTE, DANGER and CAUTION) are used
to identify levels of hazard seriousness. Definitions for
identifying hazard levels are provided below with their
respective signal words. Pay close attention to these sym-
bols and to the messages following them, as your safety
and that of others depends on it.
!
DANGER
• The text following this symbol contains information and instruc-
tions relating directly to your safety in addition to hazards or
unsafe practices which could result in severe personal injuries
or death.
• Not taking these instructions into account could lead to serious,
very serious or even fatal injuries to you and others standing
near the unit.
!
CAUTION
• The text following this symbol contains information and instruc-
tions relating directly to your safety in addition to hazards or
unsafe practices which could result in minor personal injury or
product or property damage.
• Not taking these instructions into account could lead to minor
injuries to you and others in the proximities of the unit.
• Not taking these instructions into account could lead to unit
damage.
NOTE
• The text following this symbol contains information or instruc-
tions that may be of use or that require a more thorough
explanation.
• Instructions regarding inspections to be made on unit parts or
systems may also be included
2. SAFETY SUMMARY
HITACHI cannot anticipate every possible circumstance
that might involve a potential hazard.
!
DANGER
• DO NOT perform installation work and electrical wiring connec-
tion by yourself. Contact your HITACHI distributor or dealer and
ask them for installation work and electrical wiring by service
person.
!
CAUTION
• DO NOT install the indoor unit, outdoor unit, controller and cable
at such places as;
✓ Where there is oil vapor and the oil is dispersed.
✓ Where the hot springs are near (in a sulfuric environment).
✓ Where generation, flowing, staying or leaking of flammable
gas is detected.
✓ Where the sea is near (in the salty environment).
✓ An acid or alkaline environment.
PMEN0523 rev.0 - 02/2023 - A16381TTVF
• DO NOT install the indoor unit, outdoor unit, controller and cable
within approximately 3 meters from strong electro magnetic
wave radiators such as medical equipment. In case that the con-
troller is installed in a place where there is electromagnetic wave
radiation, shield the controller and cables by covering with the
steel box and running the cable through the metal conduit tube.
• In case that there is electric noise at the power source for the
indoor unit, provide a noise filter.
• Use specified cables to connect between indoor unit and remote
control switch. Selecting incorrect cables may lead to fire or
electrical shock.
NOTE
• The installer and system specialist shall comply with local regula-
tions or standards for the safety. The following standards may
be applicable, if local regulations are not available. International
Organization for Standardization, ISO5149 or European Standard,
EN378 or Japan Standard, KHKS0010.
• Perform electrical work according to the Installation Manual. As
for the electrical wiring work and check, turn OFF the main power
supply before opening/closing the service cover of indoor unit.
If service cover is opened with main power supply left on, it may
result in an electrical shock.
• It is assumed that this renewal kit and the system will be in-
stalled, operated and serviced by English speaking people. If
this is not the case, the customer should add safety such as and
operating signs in the native language for non English speakers.
• This manual should be considered as a permanent part of the air
conditioning equipment system and should remain with the air
conditioning equipment.
• This appliance must be used only by adult and capable people,
having received the technical information or instructions to
handle this appliance properly and safely.
• Children should be supervised to ensure that they do not play
with the appliance.
• Important: read and understand this manual before using and
install this competent.
If you have any questions, contact your HITACHI distribu-
tor or dealer.
3. BEFORE INSTALLATION
1. The pressure of the refrigerant R410A is 1.4 times
higher than that of the refrigerant R22 or R407C. The
refrigerant R410A and its refrigerant oil are more sus-
ceptible to impurities such as moisture, oxide film and
grease. During installation work, therefore, make sure
that any moisture, dust, different refrigerant or differ-
ent refrigerant oil will not enter the refrigerant cycle.
2. Use the specified tool exclusively for the refrigerant
R410A in order to prevent any different refrigerant or
refrigerant oil from entering the refrigerant cycle.
3. If you use the specified refrigerant pipe exclusively
for the refrigerant R410A, perform the flaring work as
shown below.
4. Existing outdoor and indoor units for R22 or R407C
can not be used.
5. For systems with several indoor units, branch pipes
shall be changed to Hitachi-specified model.
6. Special attention is required with regard of the piping
thickness for R410A
7. Existing pipes can be used without cleaning if the fol-
lowing conditions are satisfied:
a. The renewal kit shall be installed. (mandatory)
EN
1
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