STIEBEL ELTRON DEL 18 SLi electronic LCD Gebrauchs- Und Montageanleitung Seite 19

2. Installation instructions
2.1 Brief description
The electronically controlled DEL ... SLi
electronic LCD instantaneous water heater is
a pressurised unit suitable for heating cold wa-
ter to DIN 1988 or for further heating water
pre-heated up to 55 °C.
The maximum permissible inlet temperature
is 65 °C. At higher temperatures the unit may
be damaged.
With the special fitting "Central thermostat"
(see "7. Special fittings") the max. inlet tempe-
rature can be limited to 60 °C.
One or more taps can be supplied with the
unit.
The bare-wire heating system is enclosed with
pressurised copper cladding.
The heating system is suitable for low-lime
and lime-containing water (see "5.2 Areas of
use").
Appliance with output options
For the DEL 18/21/24 SLi instantaneous water
heater, the output is adjustable in three stages.
In its delivered condition the appliance is set
to 21 kW. If the appliance is installed with a
different output, take the following steps:
• Replug coding card on the appliance PCB
above the information label, according
to the output selected. For rated current
and fuse, see Specification.
• Mark the selected output on the type
plate with a permanent marker.
1 8 2 1 2 4
k W
for the qualified installer
2.2 Important information
Air trapped in the cold water supply
can damage the bare wire heating sy-
stem inside the equipment, or trip the safety
system (see "1.4 Important informati-
on").The DEL...SLi electronic LCD is
equipped with an air detector which,
to a great extent, prevents damage to
the heating system:
If, during operation, air is drawn into the
DEL ... electronic LCD, the equipment
shuts down the power for a few seconds,
thereby protecting the heating system.
• Valves:
• Stiebel Eltron pressure valves for instan-
taneous water heaters, for installation on
finished walls (see "7. Special accessori-
es")
• Installation may be carried out using com-
mercially available pressure valves.
• Thermostatic pressure valves (see note
"1.8 Recommended adjustment").
• All information in these operating and
installation instructions must be followed
carefully. They contain important details
regarding safety, operation, installation and
maintenance of the equipment.
2.3 Instructions and
regulations
• The installation (water and electrical
work) and commissioning, as well as the
maintenance of this equipment, must only
be carried out by a qualified contractor in
accordance with these instructions.
• Perfect function and safe operation can
only be guaranteed when using original
accessories and spare parts intended for
this equipment.
• Observe all locally applicable instructions
and regulations regarding water and elec-
trical connections, such as DIN VDE 0100,
DIN 1988, DIN 4109, DIN 44851 etc.
• Observe all local water and electricity
supply company regulations.
• Install the lower area of the equipment
flush with the wall (observe dimension
≥ 110 mm B ).
• The type plate (open the hinged flap on
the equipment cap).
• See also "5. Specification".
The specific electrical resistance of
the water may not be below the value
written on the rating plate.
If the water is coming from a water-net-
work the lowest value of the water resist-
ance must be considered, (see „5.2 area of
application").
The specific electrical resistance of the
water is generally known by the water pro-
vider.
• Install the equipment only in an enclo-
sed, frost-free room. Store dismantled
equipment in frost-free conditions, since
there is always a little water left inside the
equipment.
• The protection level IP 25 (hose-proof)
is only guaranteed if a correctly installed
cable grommet is used.
Water installation:
– Cold water pipe material:
Steel, copper or plastic pipe systems.
– DHW pipe material:
Copper or plastic pipe systems*
Operating temperatures up to a max.
60 °C can be reached with the
DEL...SLi instantaneous water heater.
Maximum loads of 80 °C / 1.0 MPa may
occur briefly in the installation in the
event of a fault. The plastic pipe system
used must be designed for such condi-
tions.
• A safety valve is not required.
• Never use valves for open systems!
Electrical installation:
• Electrical connection only to permanently
wired mains power cables
• The equipment must be able to be dis-
connected from the mains power supply,
for example by fuses that disconnect all
poles with at least 3 mm contact separation.
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