2. Installation instructions for the qualified installer
!
!
2.1 Brief description
The electronically controlled instantaneous
water heater is a pressurised unit suitable for
heating cold water 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 tem-
perature 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.
18
21 24
kW
26_02_02_0935
2.2 Important information
Air trapped in the cold water supply can
damage the bare wire heating system
inside the equipment, or trip the safety system
(see
“1.4 Important information”
).
The DEL
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,
the equipment shuts down the power for a
few seconds, thereby protecting the heating
system
.
• Valves:
• Stiebel Eltron pressure valves for in-
stantaneous water heaters, for installation
on finished walls (see “7. Special accesso-
ries”)
• Installation may be carried out using
commercially 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.
• Notice for Australia / New Zealand:
The installation shall comply with AS/NZS
3500.4.
• Observe all locally applicable instructions
and regulations regarding water and
electrical connections.
• 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 writ-
ten on the rating plate.
If the water is coming from a water-network
the lowest value of the water resistance must
be considered, (see „5.2 area of application“).
The specific electrical resistance of the water
is generally known by the water provider.
• CE designation
The CE designation shows that the appli-
ance meets all the essential requirements:
– Low Voltage Directive (Council Directive
2006/95/EC).
– Electromagnetic Compatibility Direc-
tive (Council Directive 2004/108/EC). For
appliances tested to DINEN61000-3-11,
see chapter „Specification“ for the „Max.
mains impedance Zmax“. Appliances wi-
thout details comply with DINEN61000-3-
3. These appliances are not subject to any
special connection requirements.
• Install the equipment only in an enclosed,
frost-free room. Store dismantled equip-
ment 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 line
Permissible materials: Galvanised steel
pipe, stainless steel pipe, copper pipe or
plastic pipe.
– DHW line
Permissible materials: Stainless steel
pipe, copper pipe or plastic pipe.
Operating temperatures up to a max.
60 °C can be reached with the
DEL…SLi instantaneous water heater. Ma-
ximum 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 conditions.
• 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 discon-
nected from the mains power supply, for
example by fuses that disconnect all poles
with at least 3 mm contact separation.
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