ENGLISH
3  IMPORTANT NOTICE
This air conditioner has been designed for standard air 
conditioning for human beings. For use in other applications, 
please contact your HITACHI dealer or service contractor.
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personnel, with the necessary resources, tools and equipment, 
who are familiar with the safety procedures required to 
successfully carry out the installation.
PLEASE READ AND FAMILIARISE YOURSELF WITH 
THE MANUAL BEFORE STARTING WORK ON THE 
INSTALLATION OF THE AIR CONDITIONING SYSTEM. 
Failure to observe the instructions for installation, use and 
operation described in this Manual may result in operating failure 
including potentially serious faults, or even the destruction of the 
air conditioning system.
It is assumed that the air conditioning system will be installed 
and maintained by responsible personnel trained for the 
purpose. If this is not the case, the customer should include all 
the safety, caution and operating signs in the native language of 
the personnel responsible.
Do not install the unit in the following places, as this may lead to 
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•  Places where oil is present (including oil for machinery).
•  Places with a high concentration of sulphurous gas, such as 
spas.
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circulate.
•  Places with a saline, acidic or alkaline atmosphere.
Do not install the unit in places where silicon gas is present. Any 
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repel water. As a result, the condensate water will splash out 
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electrical faults may eventually be caused.
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air directly affects animals or plants as they could be adversely 
affected.
This heat pump air conditioner has been designed for the 
following temperatures. Operate the heat pump air conditioner 
within this range:
Maximum Minimum
Cooling operation
Indoor 32ºC DB / 23ºC WB 21ºC DB / 15ºC WB
Outdoor 43ºC DB * -5ºC DB *
Heating operation
Indoor 27 ºC DB 15ºC DB
Outdoor 15ºC WB* -20ºC WB *
DB: Dry Bulb; WB: Wet Bulb 
* The temperature may change depending on the outdoor unit
4  BEFORE OPERATION
 C A U T I O N
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4.1  EFFICIENT USE OF INDOOR UNIT
•  Do not leave a window or a door open.
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It may cause dew condensation of the indoor unit. (Ventilate 
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•  Attach a curtain or a blind to a window.
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increased.
•  Do not use heating appliances during the cooling operation 
as possible.
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condensation and dropping dew.
•  Use a circulator if warm air stays around ceiling.
The comfortability will be increased. Contact your distributor 
for the detail.
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gets dirty.
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30º downward from the levelness.
•  Turn OFF the main power source if the indoor unit is not 
used for a long time.
If not, the standby electricity charges will have to be paid 
even if the indoor unit is unused.
Important notice
PMML0363A rev.2 - 08/2016 - P54165593