Watts HIU 2 HK, HIU 2 HKM Installation And Operating Manual
HIU 2 series
Heat Interface Unit for hygienic domestic hot water
generation and heat distribution
Installation and Operating Manual (translated
from the original operating manual)
Issued 08/2018 Revision 1
Watts Industries Deutschland GmbH
Godramsteiner Hauptstr. 167
76829 Landau
Tel.: +49 (0) 6341 96560
wide@wattswater.com
WattsWater.de
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Contents
1 General information ...................................... 2
1.1 Important information about this installation and operating
manual ...........................................................................2
1.2 Product conformity .........................................................2
1.3 Product features ..............................................................2
1.4 Product label ...................................................................3
2 Technical data ............................................... 4
3 Safety .............................................................. 5
3.1 Depiction of safety information ........................................ 5
3.2 Important safety information ...........................................5
3.3 Intended use ................................................................... 5
3.4 Foreseeable misuse ........................................................5
3.5 Responsibilities of the operator .......................................5
3.6 Personnel groups ............................................................ 6
3.7 Information on the operating environment .......................6
4 Structure ........................................................ 7
4.1 Hydraulic diagram ...........................................................8
4.2 HIU 2 HK.........................................................................9
4.3 HIU 2 HKM.................................................................... 10
5 Installation and commissioning .................11
5.1 Installation ..................................................................... 11
6 Power curves and diagrams ...................... 13
6.1 Power curves ................................................................ 13
6.2 Pressure loss diagrams .................................................14
7 Maintenance ................................................ 16
7.1 Annual maintenance intervals ........................................ 16
7.2 Replacement of wear parts ........................................... 16
7.3 Cleaning the dirt trap ..................................................... 17
7.4 Replacing the plate heat exchanger .............................. 17
8 Spare parts list ............................................ 18
9 Disposal ........................................................ 19
9.1 Return shipment to the manufacturer ............................ 19
9.2 Reporting to administrative bodies and the
manufacturer .................................................................19
1 General information
1.1 Important information about the installation and operating manual
The operator is responsible for ensuring
adherence to the local laws and regulations
(e.g. accident prevention regulations,
etc.).
Incorrect operation or operating the HIU 2
contrary to the specifications shall void all
rights to any warranty claim.
This installation and operating manual
• is a component of the HIU 2
• contains instructions and information on safe and correct
installation and commissioning of the HIU 2
• must be available to all users throughout the entire service
life of the HIU 2
• is intended for trained personnel who are familiar with the
applicable standards and provisions and, in particular, with
the relevant safety concepts and the operation and maintenance of the HIU 2
• is protected by copyright and may not be altered without
the manufacturer’s permission
• may not be made accessible to unauthorized personnel,
either in original form or as a copy.
1.2 Product conformity
A Declaration of Conformity according to the Machinery
Directive 2006/42/EC has been issued for this HIU 2 product.
1.3 Product features
• Stable bracket
• Intended for installation in a surface-mounted cabinet,
flush-mounted cabinet or EPP insulation.
• All connections to the system with 1” male thread and 3/4”
male thread, and flat sealing
• Tapping temperature adjustable
• Max. draw-off capacity of DHW 12 l/min and 17 l/min
at DHW heated from 10 to 45 °C, at a primary supply
temperature of 65 °C and 200 mbar delta p.
• Very convenient controls, compact, space-saving design.
• Modular structure and suitable for connection to manifolds.
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1.4 Product marking
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2 Technical data
Hydraulic performance data
HIU 2 HK / HIU 2 HKM
Max. operating pressure
10 bar (PN 10)
Max. ambient temperature
60 °C
Max. operating temperature
90 °C
Differential pressure
200 mbar preset. Adjustable: 100 to 300 mbar
Media
Water/water-glycol mixture as per VDI 2035/ÖNORM (Austrian standard) 5195
Actuating drive
Voltage
230 V; +10…-20 %; 50/60 Hz
Power consumption, operating
2.5 W
Power consumption, end position
<1 W
Actuating power
100 N
Protection class
IP 54
Ambient temperature
0 to 60 °C
Dimensions
Width x height x depth
HK
HKM
490 X 705 X 130 mm
500 x 705 x 140 mm
Weight
Total weight excluding packaging
HK12 / HK17 / HKM12 / HKM17
approx. 13 kg / 14 kg / 16 kg / 17 kg
Total weight including packaging
HK12 / HK17 / HKM12 / HKM17
approx. 15 kg / 16 Kg / 18 Kg / 19 kg
Connections to pipe network
Heat interface unit
1” male thread and ¾” male thread, flat sealing
Meter connections
Adapter for heat meter
110 mm G ¾
Adapter for cold water meter
110 mm G ¾
Materials
Pipes
Stainless steel Ø22 & Ø27 mm
Fittings
Brass
Seals
AFM34/2 and EPDM
Plate heat exchanger
stainless steel EN 1.4404/copper (solder) | optional stainless steel/stainless steel (solder)
Refer to the corresponding data sheets for more detailed information on the media used
Circulation pump, actuator and other
components
Technical data can be found in the enclosed technical documentation.
DHW performance
Primary
temperature
Secondary
temperature
Pressure loss Flow rate Flow rate
Supply Return DCW DHW Primary Primary Secondary
26 plates 33 kW 65 °C 19 °C 9 °C 48 °C 19 kPa 11.2 l/min 12.0 l/min
36 plates 40 kW 65 °C 18 °C 11 °C 45 °C 19 kPa 13.4 l/min 17.1 l/m i n
HIU 2 per formance
Heat output (10K) Q= 13 kW
Heat output (20K) Q= 26 kW
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3 Safety
3.1 Depiction of safety information
DANGER indicates an imminent danger
that may cause serious physical injury or
death if the appropriate safety precautions are not in place.
WARNING indicates a danger arising
through incorrect behavior (e.g. misuse,
disregarding notices, etc.) that may cause
serious physical injury or death.
CAUTION indicates a potentially dangerous situation that may cause minor or
slight injuries if the appropriate safety
precautions are not in place.
NOTICE indicates a situation that may
cause material damage if the corresponding precautions are not taken.
3.2 Important safety information
• Before using the device, read this operating manual
through carefully.
• Only connect the HIU 2 to a power source that corresponds to the mains voltage specified on the rating plate of
the HIU2.
• The power supply to the HIU2 must be disconnected prior
to maintenance, cleaning and repair work.
• Maintenance, cleaning and repair work may be carried out
by trained specialist personnel only.
• The HIU2 must not be used if it is damaged or if the HIU2
is no longer operating correctly. In this case, contact your
specialist dealer immediately.
• Observe the maintenance instructions and intervals.
• Protect the HIU2 from the influences of weather.
• Never use the HIU2 outdoors.
• The unit may be used only in accordance with its intended use.
3.3 Intended use
Ready-to-install compact, decentralized heat interface unit for
hygienic domestic hot water generation and heat distribution
in single-family houses and townhouse systems as well as for
use in multi-story apartment blocks.
The HIU 2 is not intended to be operated by people (including children) with physical, sensory or mental disabilities, nor
by people with insufficient experience or previous knowledge.
3.4 Foreseeable misuse
The following is considered to be foreseeable misuse:
• Operating the HIU 2 contrary to the specifications
• Improper use of the HIU2
• Modifications to the HIU2 that were not agreed with the
manufacturer
• Use of replacement or wear parts that were not approved
by the manufacturer
• Operating the HIU2 outdoors (parts and components are
not UV resistant)
• Use of prohibited media
3.5 Responsibilities of the operator
The operator must ensure that:
• the HIU2 is only used for its intended purpose
• the HIU2 is installed, operated and maintained according to the specifications in the Installation and Operating
Manual
• the HIU2 is only operated according to local regulations
and occupational health and safety regulations
• all precautionary measures have been carried out to avoid
dangers originating from the HIU2
• all precautions for first aid and fire suppression are carried
out
• only authorized and trained users have access to the HIU2
and operate it
• users have access to this installation and operating manual
at all times
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3.6 Personnel groups
Only qualified persons may install and operate the HIU 2 or
perform maintenance work.
Operator
An operator is deemed to be qualified if they have read these
operating instructions and understood the potential hazards
associated with improper behavior.
Fitter/commissioning engineer
A plumber or commissioning engineer is in a position, taking
into consideration the applicable standards, provisions, regulations and laws and his/her technical training and technical
knowledge, to carry out work on the HIU 2 and to detect and
prevent potential hazards.
3.7 Information on the operating environment
Limescale deposits (from hard water) and corrosion, as well
as chemical and physical reactions, can cause damage to the
home station.
The selection of material for the plate heat exchanger (copper
or stainless steel) must be checked with reference to the water
quality (corrosion resistance).
The system planner is responsible for evaluating these
parameters and taking appropriate precautions.
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