2. INTRODUCTION
2.1 General
This manual contains information on the
installation, commissioning, operating and
maintenance of the HIU. As an authorised
specialist personnel, please read it carefully.
Keep the manual with the product at all times
so that information can be found quickly. Ensure
this manual is read in full before undertaking
installation.
Please pay particular attention to the information
given in the safety instructions (section 3), as well
as the notes highlighted in the individual sections
of this document.
The HIU must not be put into operation while it is
dismantled or prior to commissioning.
2.2 Additional Documents
The HIU installation must be undertaken by
qualified/competent mechanical and electrical
engineers. The installation must also be in
accordance with all Building Regulations
applicable to location and the IET Electrical
Regulations.
In addition, regulations applicable to the field of
application of the HIU, local accident prevention
regulations and general safety regulations must
be followed.
The diagrams contained within this manual
are provided to assist the reader with a better
understanding of the written description. The
diagrams used are generic and could be slightly
different from the actual HIU supplied. Do not
scale from the diagrams provided.
The HIU is constructed utilising different products
from numerous manufacturers. Relevant
documentation from those manufacturers must
also be followed with regards to best practices and
safety.
As each manufacturer will have undertaken
independent testing for the components
used within the HIU, it is important that their
documentation is also followed. The declaration of
conformity for each component must be sourced
from the component manufacturer.
2.3 Symbols Used in the Document
The box containing symbol and text is always below
the issue it is advising about.
WARNING
Risk of a dangerous situation causing
physical injury and/or damage. Please
follow the notes for working safely and
take extreme care.
DANGER
Electrical hazard.
Failure to follow safety procedures
can result in severe injury or death.
This work may only be performed by a
trained electrician.
CAUTION
Risk of material damage or
malfunction / failure of equipment if
ignored.
IMPORTANT
Highlights important information that
must be adhered to facilitate efficient
and correct operation.
2.4 Abbreviations
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H E A T I N T E R F A C E U N I T
I N T R O D U C T I O N
Page 5
2.5 Liability and Warranty
The HIU is manufactured in compliance with
relevant European Directives and complies with
the CE marking directive. See section 5 of this
document for further information.
Vital Energi reserve the right to modify the HIU to
improve operation and functionality due to further
development and/or improve product safety.
Therefore the information contained within
this document is subject to change without
notification.
It is assumed that the installer of this product is
competent to install, commission and operate the
HIU. Thus, the responsibility of the installation and
commissioning of the HIU lies with the installer.
The installer must adhere to the following
instructions:
Undertake the installation and commissioning
in compliance with all Approved Documents,
British Standards and all other relevant
legislation
Adhere to the instruction manuals in full. If
unsure about any information contained within
the document, consult with Vital Energi
Undertake the commissioning of the HIU in
line with the instructions and complete the
commissioning form
Undertake relevant checks and start up the HIU
Provide training to the end user on the
operation of the HIU
Explain the maintenance requirements to the
end user and make reference to the guidance
in Section 9 of this document
Leave all documentation with the end user
H E A T I N T E R F A C E U N I T
I N T R O D U C T I O N
BESA
Building Engineering Services
Associations
DHW
Domestic Hot Water
HIU
Hydraulic Interface Unit
HTG
Heating
MCW
Mains Cold Water
SRV
Safety Relief Valve
PCB
Printed Circuit Board
PICV
Pressure Independent Control Valve
UFH
Under Floor Heating
VWART
Volume Weighted Annual Return
Temperature
