Hitachi RAK-25NH6 User manual

room air
conditioners
Models
Monozone/Multizone
(NH5/NH6/NH7/QH5)
Summit
(YH5/FH5/YH6)
Monoduct
(DH7)
Bigflow
(GH4/G4)
Air Exchanger
(JX5)
ROOM AIR
CONDITIONERS

3
Company profile 4
Standards and quality certificates 5
Product range overview 6
General features and benefits 8
Monozone/Multizone range 12
Summit range 52
Monoduct range 58
Bigflow range 60
Air Exchanger range 62
Contents

Air conditioning from Hitachi can
justifiably be described as the art
of exploiting the latest ideas and
developments in technology to
create a range of innovative products
which provide a more comfortable
and more productive environment
in which people can happily live
and work. It is also an art executed
with a responsible concern for
protecting the environment.
Ecological thinking begins at the
very first stages of new product
design and continues throughout
production, installation procedures,
equipment and operation.
Specifiers and users alike can
always be assured that
performance and costs are not the
only parameters by which Hitachi
products can be judged.
To achieve success with such
objectives on a global scale
requires not only enormous
resources but also a commitment
to the future. As one of the largest
companies in the world, Hitachi is
well positioned to undertake this
commitment with confidence that
comes from successfully
responding to the changing needs
of people for over 90 years.
In Japanese, Hitachi means sunrise
– we are the forefront of research
and development turning new ideas
and innovations into new products.
Of its $81.4 billion sales worldwide
in 2003, close to 5.2% was invested
into research and development
programs. This vast amount of
money has given Hitachi the
opportunity to conceive many ‘world
firsts’ – examples of which include
the technologically advanced and
acclaimed scroll and semi-hermetic
screw compressors. These have
been incorporated in Hitachi’s air
conditioning systems and water
chillers which have revolutionised air
conditioning worldwide.
The majority of our room air
conditioning products are developed
at our Tochigi Works in Japan. This
is the main focus not only for
production but also for research and
development with respect to all our
room air conditioning products. To
assist in production and distribution
worldwide we have seven affiliated
production companies for room air
conditioners and compressors.
Hitachi’s advanced air conditioning
products are specified all over the
world, wherever there is a
requirement for ultimate performance
and cost effective, long term
reliability. A wide range of units
coupled with a choice of advanced
control systems mean Hitachi can
provide solutions to meet every
possible air conditioning application
or specification. Authorised
distributors all over the world
contribute their own specialised
technical support and practical
assistance to provide individual
system designs, commissioning and
after sales service.
Hitachi Authorised Distributors are
committed to providing an unrivalled
support from a combination of
experienced engineers, local
product and spare parts stock,
supported in turn by on-going
technical support from Hitachi.
From the initial product concept at
Hitachi’s research and development
facility in Japan, product
development is dedicated to
providing the products the
customer requires. Product design
and development is continuous
with priority being given to the use
of ecologically friendly refrigerant.
To satisfy your cooling and heating
requirements and to ensure the
optimum indoor environment,
consider Hitachi the first and last
word in air conditioning.
Company profile

5
Quality control
Tochigi Works and its overseas affiliates have
acquired International Standard Quality Management
System ISO9001 and ISO14001 authorisation. The Tochigi
Works performs thorough product quality control using
various environmental tests. Hitachi Room Air Conditioning
Indoor and Outdoor units are manufactured according to
this ISO certification system.
Hitachi products all carry the necessary ‘CE’
declaration markings, and also feature in the extensive
Eurovent Listing programme. Listing in the Eurovent
directory helps ensure peace of mind for the installer and
the end user, as it certifies the important operating
parameters and performance of the units.

Summit range the units have a stylish
flat panel design offering elegance
and comfort to any application.
The Hitachi range of Room Air
Conditioners feature a vast array
of significant features all designed
with the user in mind.
• High efficiency DC Inverter
PAM control
• Eco friendly R410a refrigerant
• High power and performance
for greater energy efficiency
• Low ambient working range -10°C
for cooling, -15°C for heating
Hitachi’s new range of Room
Air Conditioning systems has
developed significantly in recent
years following a great deal of
investment in research and
development and testing facilities
at various Hitachi factories and
laboratories, around the world.
Hitachi has continuously developed
sophisticated energy saving air
conditioning systems that reduce
CO2emissions and help to protect
the global environment.
The latest Room Air Conditioning
offering from Hitachi is the Framed
Flat range of wall mounted units.
Available in the MonoMultizone or
• Remarkably low sound levels
• Strong heating capacity under
low ambient temperature
conditions
• Zone by zone heating or cooling
for up to four areas, and wide
selection of indoor unit type
and capacities
• Highest air quality
• Easy installation and servicing
• An elegant design
Product range overview

Outdoor Units
All DC Inverter PAM Monozone/Multizone
Indoor Units
Non Inverter Mono Split
1.8 6.0
Capacity Range [Kw]
5.0
3.5
2.5
Framed Flat Wall
Wall
Floor
4-way Cassette
In-the-Ceiling
Monozone*
Capacity Range [Kw]
2.5 3.5 5.0 7.5 8.8 11.0 12.06.0 15.5 17.6
Multizone**
*
Nominal cooling capacities
**
Maximum indoor combination nominal cooling capacities
All DC Inverter PAM Mono Split
Summit Framed Flat
Capacity Range [Kw]
2.0 3.5 8.02.5 6.0 7.0
5.0
Summit YH5
Summit YH6
Monoduct
Air Exchanger
Bigflow –
Heat Pump
Capacity Range [Kw]
2.0 3.52.9 5.0 6.5
Bigflow –
Cooling Only
7

High Energy Efficiency
Hitachi conforms to the
2002/31/EC Directive – 92/75/EEC
“Energy labelling Directive (ELD)” ,
which is applicable from June 2004
on all air conditioning products up
to 12Kw cooling capacity. The DC
inverter PAM technology helps us
to achieve the ‘A’ class, the highest
level of energy efficiency which is
clearly indicated on the standard
labelling system.
Advantages include:
Rapid start up
The variable speed compressor
(inverter) enables the system to
rapidly reach the desired room
temperature setting. Once the
desired room temperature has been
achieved the compressor rotation
speed is reduced, saving up to 30%
in energy usage (when compared to
conventional systems) without
compromising comfort levels.
Improved performance
The inclusion of a DC driven motor
delivers an enhanced performance
over standard AC motor driven
systems. This enhanced performance
can be as much as 10%!
Features and benefits
Rapid Start Up
Improved Performance
PAM – Minimised loss
of performance
Hitachi’s PAM (Power Active Module)
control system mirrors the current
pulse waveform to avoid distortion
and therefore achieve almost
100% power factor to enhance
power efficiency. This cutting edge
device is employed in all Hitachi
Mono/Multizone products for your
comfort and energy saving for our
environment. It ensures the efficient
use of input power and minimises
loss to less than 1%. The PAM
range boasts an industry leading
COP of more than 4.0.
All DC Inverter
As you would expect from an
Industry leader such as Hitachi,
we have been at the forefront of
technological development and
advancement. As the pioneer
of ‘DC’ Inverter driven Room
Air Conditioners, our units boast
the significant advantage of all
DC Inverter driven compressors
and fans. Enhanced inverter
performance and system
performance are achieved by
the addition of a ‘DC’ drive.
Conventional Inverter PAM Inverter

9
High performance
cooling at -10ºC and
heating at -15ºC
The cooling and heating performance
is even more impressive than
previously. The units have been
designed for cooling operation
under low temperatures down to
-10°C. At outdoor temperatures as
low as -15°C, the PAM controlled
range of inverter split systems
continue to provide high capacity
heating performance.
Digital DC Scroll
Compressor
The motor uses digital control to
maximise PAM control performance.
• Loss during high-speed revolution
is reduced thanks to digital control
of the motor.
• Shaft runout during high-speed
revolution is lessened by three
balancers mounted on the
crank shaft.
• Efficient operation with drastically
reduced refrigerant leakage is
ensured by the automatic
compression system, in which the
tip of the slewing scroll is kept in
absolute contact with the fixed
scroll, in addition to special
processing of the scroll surface.
DC Twin Rotary Compressor
Today all Monozone and two Multizone
room air conditioning units have Hitachi’s
new twin rotary compressor which has even
less vibration and even higher performance
efficiency than conventional rotary compressors.
• Two rotating cylinders ensure well balanced
rotation unlike the conventional single-rotary
type, thus greatly reducing any vibration noise.
• The compressor’s operation is magnificently
improved by the independent operation of
the cylinders leading to greater efficiency
and lower vibration.
Drawing of cylinder balance
Comparison of vibration
Single
1
Twin
1/5
Conventional single-rotary New twin-rotary
Compressor Technology
Heating at
Cooling at

Features and benefits
R410aRefrigerant
Hitachi is using the new R410a
refrigerant in all of its room air
conditioning products to ensure its
continual environmentally friendly
approach as well as the on going
development of techniques for
saving energy and reducing
power consumption.
Air Quality
Either the SPX-CFH5 or SPX-CFH11, washable
carbon and anti-bacteria air purifying filters are
included in all of Hitachi’s room air conditioning
products. This ensures that the micro dust,
pollen particles and odours that can collect on
filters can be easily removed. The filters can be
washed and reused up to 20 times.
Self Diagnosis System for
Easy Servicing
All air conditioning units are made
with easy servicing in mind. All
components can be easily reached
and self diagnosis is made easy.
Errors are easily identified by the
blinking patterns made by lights on
the LED outside the indoor and
inside the outdoor units.
SPX-CH5, SPX-CH11
Breathable structure. Micro level dust is absorbed by static electricity.
Reusable after washing.