Zenner IUWS Instrucciones De Montaje Y De Uso página 8

For the IUWS series at least 3xDN are recommen-
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ded as a straight inlet section. Ideally, at least
2xDN should be available as the outlet section.
The pipe cross-section should not be reduced or
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extended directly in front of or behind the measu-
ring instrument.
Connection seals must not protrude into the pipe
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cross-section.
Valves or other flow regulators should be installed
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downstream of the measuring instrument if
possible.
If necessary, the measuring instrument should be
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protected by a corresponding filter, so that no for-
eign particles, such as stones or sand, are flushed
into the measuring instrument and cause damage.
The measuring instrument must be protected
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against pressure surges in the pipe network.
The measuring instrument may only be installed
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in a frost-proof location and the ambient tempera-
ture must not exceed +55 °C.
The measuring instrument should be installed,
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where possible, at the deepest point of the pipe
installation so that air bubbles are not able to
form in the measuring instrument and the pipe is
always completely filled.
The water temperature must not exceed the per-
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missible 50°C (T50).
When using lubricants / assembly pastes e.g. for
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the seals, it must be ensured that these are suitab-
le for contact with drinking water.
If there is a risk of frost, shut off the system and
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empty it completely (including the measuring
instrument!), removing the measuring instrument
if necessary.
Installation manual
Read the installation manual carefully right up to
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the end before beginning installation.
Prior to installing the measuring instrument,
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the pipe is to be carefully flushed.
Close the valves upstream and downstream of the
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measuring instrument and relieve the pressure at
the installation point.
Dismantle existing measuring instrument or
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adapter piece.
Old seals must be removed immediately after
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dismantling the existing measuring instrument or
adapter piece. The corresponding sealing surfaces
must be cleaned and checked for damage.
Check before starting installation:
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–
that all sealing surfaces are flat and free of
damages such as notches, grooves or similar.
–
all information on the dial/register cap/type
plate is legible.
–
the measuring instrument is suitable in
terms of the design, size, temperature range
and pressure rating for the installation site.
Only use new and flawless sealing material.
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It must be ensured that the flow direction of the
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measuring instrument matches that of the pipe.
Screw on the swivel nuts by hand and tighten with
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a suitable tool. Make sure that the seals are seated
correctly.
It must be ensured that the meter is installed in
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a tensionless state in the pipe. In the case of an
installation that is tensionless, the housing of the
measuring instrument can be damaged and water
may escape.
To prevent damage to the measuring instrument
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caused by pressure surges after installation, the
pipe must be filled slowly after installation.
The measuring instrument must be easily acces-
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sible at all times after installation to guarantee
that the key data and the conformity/metrology
mark can be read at all times.
Check installation point for leaks after installation.
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We recommend securing the connection points
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against unauthorised disassembly with a user
safeguard. It should not be possible to remove or
loosen the guard without visibly damaging it.
Note on short overall lengths
Use a screwdriver/metal rod (Ø max. 5.2mm) or
similar tool to hold the short overall lengths (110mm
– 145mm) when tightening the screw connections.
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