
2.2 IMPORTANT NOTICE
The supplementary information about the purchased products
is supplied in a CD-ROM, which can be found bundled with the
outdoor unit. In case that the CD-ROM is missing or it is not
readable, please contact your HITACHI dealer or distributor.
PLEASE READ THE MANUAL AND THE FILES ON THE
CD-ROM CAREFULLY BEFORE STARTING WORK ON THE
INSTALLATION OF THE AIR CONDITIONING SYSTEM. Failure
to observe the instructions for installation, use and operation
described in this documentation may result in operating failure
including potentially serious faults, or even the destruction of the
air conditioning system.
This manual should be considered as a permanent part of the
air conditioner. This manual gives a common description and
information for this air conditioner which you operate as well as
for other models.
Refer to the models codication to conrm the main
characteristics of your system.
Verify, in accordance with the manuals which appear in the
outdoor and indoor units, that all the information required for the
correct installation of the system is included and correspond to
your air conditioner model. If this is not the case, contact your
distributor.
If you have any questions, contact your service contractor of
HITACHI.
2.3 ADDITIONAL INFORMATION ABOUT SAFETY
!DANGER
• HITACHI is not able to foresee all the circumstances which may
result in a potential danger.
• Do not pour water into the indoor or outdoor unit. These products
are equipped with electrical parts. If water contacts with electrical
components then it will cause a serious electrical shock.
• Do not handle or adjust the safety devices inside the indoor and
outdoor units. The handling or adjustment of these devices may
result in serious accident.
• Do not open the service cover or access the indoor or outdoor
units without disconnecting the main power supply.
• In case of re Turn OFF the main switch, put out the re at once
and contact your service contractor.
• This air conditioner is equipped with a high pressure vessel
under PED (Pressure Equipment Directive). The pressure
vessel has been designed and tested before shipment
according to PED. Also, in order to prevent the system from
an abnormal pressure, a high pressure switch, which needs
no eld adjustment, is utilized in the refrigeration system.
Therefore, this air conditioner is protected from abnormal
pressures. However, if abnormally high pressure is applied to
the refrigeration cycle including the high pressure vessel(s),
it will result in serious injury or death due to explosion of
the pressure vessel. Do not apply a pressure higher than the
following pressure to the system, by modifying or changing the
high pressure switch.
• Do not handle, modify or change the high pressure switch in the
air conditioning unit. If abnormally high pressure is applied to the
elements in the air conditioning unit refrigerant cycle, including
the high pressure vessels, these could explode resulting in
serious injury or loss of life.
Location Structure
Accumulator Compressor
High pressure switch Contact point
Pressure detected
Connected to the electrical wire
The label for the vessel under PED
are attached on the high pressure
vessel. The pressure vessel capacity
and vessel category are indicated on
the vessel.
The high pressure switch is indicated
on the electrical wiring diagram in the
outdoor unit as HPS connected to printed
circuit board (PCB) in the outdoor unit.
Start-up and Operation: Checktoensurethatallthestop
valvesarefullyopenedandnoobstacleexistsattheinlet/outlet
sidesbeforestart-upandduringtheoperation.
Maintenance:Periodicallycheckthehighpressureside
pressure.Ifthepressureishigherthanthemaximumallowable
pressure,stopthesystemandcleantheheatexchangeror
removethecause.
Refrigerant Maximun allowable
pressure (MPa)
High pressure switch
cut-out value (MPa)
R410A 4.15 4.00 ~ 4.10
!CAUTION
• Checkforrefrigerantleakageindetail.Itmayhinderrespirationasthe
gasdisplacestheairintheroom.Alsoharmfulgaseswouldoccurifa
rewerebeingusedintheroom.
• Fittheindoorunit,theoutdoorunit,theremotecontrolandthecable
ataminimumof3metersawayfromsourceswhereelectromagnetic
wavesradiatedirectlytowardstheelectricalboxandthecomponents
oftheunit,suchasmedicalequipment.Electronicnoisemayresultin
theincorrectoperationoftheunit.
• Donotusesprays,suchasinsecticides,varnishesorenamelsorany
otherinammablegaswithinameterofthesystem.
• Ifthecircuitbreakerorsupplyfuseoftheunitcomesonfrequently,
stopthesystemandcontacttheservicesuppler.
• Donotplaceanyforeignmaterial(branches,sticks,etc.)intheair
inletoroutletoftheunit.Theseunitsarettedwithhighspeedfans
andcontactwithanyobjectisdangerous.
• This appliance must be used only by adult and capable people,
having received the technical information or instructions to handle
thisapplianceproperlyandsafely.
• The air conditioning system should only be installed, carry out
maintenanceorinspectionbyqualiedpersonnel,withthenecessary
resources, tools and equipment, who are familiar with the safety
proceduresrequiredtosuccessfullycarryouttheinstallation.
• Childrenshouldbesupervisedtoensurethattheydonotplaywith
theappliance.
• Thisairconditionerhasbeendesignedforstandardairconditioning
forhumanbeings.Foruseinotherapplications,pleasecontactyour
HITACHIdealerorservicecontractor.
?NOTE
• Theairintheroomshouldberenewedandtheroomventilatedevery
3or4hours.
• The system tter and specialist shall provide anti-leak safety in
accordancewithlocalregulations.
SAFETY
PMML0511 rev.1 - 06/2019
20