ENGLISH
1  GENERAL INFORMATION
1RSDUWRIWKLVSXEOLFDWLRQPD\EHUHSURGXFHGFRSLHG¿OHG
or transmitted in any shape or form without the permission of 
HITACHI Air Conditioning Products Europe, S.A.U.
Within the policy of continuous improvement of its products, 
HITACHI Air Conditioning Products Europe, S.A.U. reserves 
WKHULJKWWRPDNHFKDQJHVDWDQ\WLPHZLWKRXWSULRUQRWL¿FDWLRQ
and without being compelled to introducing them into products 
subsequently sold. This document may therefore have been 
subject to amendments during the life of the product.
HITACHI makes every effort to offer correct, up-to-date 
documentation. Despite this, printing errors cannot be controlled 
by HITACHI and are not its responsibility. 
As a result, some of the images or data used to illustrate this 
GRFXPHQWPD\QRWUHIHUWRVSHFL¿FPRGHOV1RFODLPVZLOOEH
accepted based on the data, illustrations and descriptions 
included in this manual.
2  SAFETY
2.1  APPLIED SYMBOLS
During normal heat pump system design work or unit 
installation, greater attention must be paid in certain situations 
requiring particular care in order to avoid injuries an damage to 
the unit, the installation or the building or property.
Situations that jeopardise the safety of those in the surrounding 
area or that put the unit itself a risk will be clearly indicated in 
this manual.
To indicate these situations, a series of special symbols will be 
used to clearly identify these situations.
Pay close attention to these symbols and to the messages 
following them, as your safety and that of others depends on it.
 D A N G E R
•  The  text  following  this  symbol  contains  information  and 
instructions  relating  directly  to  your  safety  and  physical 
wellbeing.
•  Not taking these instructions into account could lead to serious, 
very  serious  or  even  fatal  injuries  to  you  and  others  in  the 
proximities of the unit.
,QWKHWH[WIROORZLQJWKHGDQJHUV\PERO\RXFDQDOVR¿QG
information on safe procedures during unit installation.
 C A U T I O N
•  The text following this symbol contains information and instructions 
relating directly to your safety and physical wellbeing.
•  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.
,QWKHWH[WIROORZLQJWKHFDXWLRQV\PERO\RXFDQDOVR¿QG
information on safe procedures during unit installation.
 N O T E
•  The text following this symbol contains information or instructions 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.
2.2  ADDITIONAL INFORMATION ABOUT SAFETY
 D A N G E R
•  DO NOT CONNECT THE POWER SUPPLY TO THE INDOOR UNIT 
PRIOR TO FILLING  THE SPACE HEATING  CIRCUIT (AND  DHW 
CIRCUIT IF IT WERE THE CASE) WITH WATER AND CHECKING 
WATER PRESSURE AND THE TOTAL ABSENCE OF ANY WATER 
LEAKAGE.
•  Do  not  pour  water  over  the  indoor  unit  electrical  parts.  If  the 
electrical  components  are  in  contact  with  water  a  seri ous 
electrical shock will take place.
•  Do not touch or adjust the safety devices inside the air to water 
heat pump. If these devices are touched or adjusted, a serious 
accident can take place.
•  Do not open the service cover or access inside the air to water 
heat pump without disconnecting the main power supply.
•  ,QFDVHRI¿UH7XUQ2))WKHPDLQVZLWFKSXWRXWWKH¿UHDWRQFH
and contact your service contractor.
•  It must  ensure  that the  air  to water  heat pump  cannot  op erate 
accidentally  without  water  neither  with  air  inside  hydraulic 
system.
 C A U T I O N
•  Do not use any sprays such as insecticide, lacquer, hair spray or other 
ÀDPPDEOHJDVHVZLWKLQDSSUR[LPDWHO\RQHPHWHUIURPWKHV\VWHP
•  If installation circuit breaker or the unit fuse is often activated, stop the 
system and contact your service contractor.
•  Do not make service or inspections tasks by yourself. This work must 
EHSHUIRUPHGE\DTXDOL¿HGVHUYLFHSHUVRQ
•  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.
•  Do not let any foreign body into the water inlet and outlet piping of the 
air to water heat pump.
GENERAL INFORMATION
PMML0340B rev.1 - 03/20161