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14 HIU2-IM-DE-W-UK-04-2021-Rev7 | Part no. 10078860
EN ENGLISH
6 Installation and commissioning
Electricity!
Risk of death from electric shock.
Work on parts carrying live voltage must
only be carried out by trained electricians.
Disconnect the power supply of the sys-
tem and secure it against being switched
back on before carrying out any installa-
tion, maintenance, cleaning or repair work.
The installation and commissioning of the
HIU 2 must only be carried out by trained
personnel who have been authorized by
the manufacturer.
When installing and operating a circula-
tion system, the recognized rules of engi-
neering as well as the hygiene regulations
according to "DVGW Arbeitsblatt W551"
(German association for gas and water,
worksheet W551) must be observed.
The HIU 2 may only be installed in an
upright position.
When repairing the unit or replacing parts,
be sure to observe the specified installa-
tion positions and flow directions of the
parts being replaced.
Material damage!
Pressure shocks may occur if the stop
valve is opened quickly.
Always open the stop valve slowly and in
a controlled way.
Bad water quality!
Hard water causes limescale deposits in
the HIU 2 and diminishes the performance.
Measure the water hardness in the supply
system.
Install a water softening unit from a degree
of hardness of 17° dH.
Installation
All screw fittings must be checked and tightened if nec-
essary prior to installation and commissioning.
Torque:
¾" screw fittings 35 Nm
1" screw fittings 55 Nm
Requirements
The HIU 2 cabinet (surface-mounted or flush mounted) is
installed.
When connecting the HIU 2 to the drinking water pipeline
the acknowledged rules of technology must be taken into
account.
The installation sequence must be observed to prevent
electrochemical corrosion of galvanized lines and fittings.
The valves are pre-installed at the factory but must be
checked for leaks during commissioning (hydraulic pressure
test).
Recommendation: Install water filter into the cold
water inlet.
14


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