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measuring, control engineering, control techno-
logy and IT.
Access for unqualified and untrained persons
must be restricted or forbidden.
The set-up location of the expansion automat
must ensure that operation, service, maintenance,
inspection, repair, installation and dismant-
ling can be carried out unhindered and without
danger. The floor of the set-up location for the
expansion automat must be such that stability is
guaranteed and maintained. Bear in mind that the
maximum possible forces can be exerted from the
net mass including the water volume. If stability
cannot be guaranteed, there is a danger that the
vessel will tip over or move and, as a consequence
in addition to functional defects may lead to
personal injury.
The ambient atmosphere must be free from con-
ductive gases, high concentrations of dust and
aggressive vapours. There is the risk of explosion
if any combustible gases are present.
In case of function-driven opening of the drain
valve on the backflow preventer (optional top-
up) or triggering of the relief valve to prevent
overloading of the vessel, as well as for potential
overflow at the connection in a case of vessel dia-
phragm damage to compensate for atmospheric
pressure, the top-up or process water is drained.
Depending on the process, the water tempera-
ture can rise to 70 °C and, in the case of improper
operation exceed 70 °C. This presents a danger of
personal injury through burns and/or scalding.
It is important to ensure that this water can be
drained safely, and - to prevent water damage -
that there is a safe drain or water collector in the
immediate vicinity of the appropriate equipment
(groundwater protection: observe additives!).
Flooded equipment must not be operated. If elec-
trical equipment short circuits, persons or other
beings in the water will be electrocuted. Further-
more, there is a danger of malfunction and partial
or irreparable damage to individual components
due to water saturation and corrosion.
4.9. Noise reduction
Installations should be constructed with noise-
reduction measures in mind. Mechanical vib-
rations of the assembly (Module framework,
pipework) in particular can be dampened by using
insulation between contact surfaces.
4.10. EMERGENCY-STOP / EMERGENCY-OFF
To conform with directive 2006/42/EG an
EMERGENCY-STOP facility is made available by
the main power switch on the control unit. This
switch separates the phases and neutrals. When
additional security measures with EMERGENCY-
OFF devices are required according to the design
and operation of the heat generator, these are to
be installed on-site.
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4.11. Personal protective equipment (PPE)
PPE must be used when carrying out potenti-
ally dangerous work and other activities (e.g.
welding), in order to prevent or minimise the risk
of personal injury if other measures cannot be
taken. These must comply with the requirements
specified by the main contractor or operator of
the operations room or the site in question.
If no requirements are specified, to operate the
automat no PPE is required. Minimum require-
ments are well-fitting clothing and sturdy, closed
and skidproof footwear.
Other services require the protective clothing and
equipment necessary for the activity in question
(e.g. transport and assembly: rugged, close-fit-
ting work clothing, foot protectors [safety shoes
with toe caps], head protection [safety helmet],
hand protectors [protective gloves]; maintenance,
repair and overhaul: rugged, close-fitting work
clothing, foot protectors, hand protectors, eye/
face protector [safety goggles]).
4.12. Exceeding permitted pressure / temperature
levels
Equipment used in combination with the expan-
sion automat must guarantee that the permitted
operating temperature and the permitted medium
temperature (heat transfer medium) cannot be
exceeded. Excess pressure and temperature may
lead to component overload, irreparable damage
to components, loss of function and, as a result,
to severe personal injury and damage to property.
Regular checks/inspections of these safeguards
must be carried out. Service logs must be kept.
4.13. System water
Water which is non-flammable, does not contain
solids or long-fibre components and does not
present a danger to operations due to its con-
tents, and will not affect or damage the water be-
aring components (e.g.: pressurised components,
the diaphragm, vessel connection) of the expan-
sion automat. Also observe: VDI 2035 - avoidance
of damage to warm water heating equipment.
System water containing components are pipe-
lines, hoses connected to the vessel, devices and
system connections including valves and fittings,
and their casings, sensors, pumps, the vessel
itself and the vessel diaphragm. Operation with
improper media can lead to impaired function,
damage to components and, as a consequence, to
serious personal injury and damage.
4.14. Safeguards
The equipment supplied is equipped with the re-
quired safety devices. To test their effectiveness
or restore the set-up conditions, the equipment
must first be taken out of service. Taking the sys-
tem out of service implies that power should be
cut and hydraulic connections blocked, to prevent
accidental or unintentional re-connection.
WILO SE 08/2018
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