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2.6 Technical Data
(the data on the rating place applies)
Type
Rated power
kW
Pressure loss*
with DMB
MPa (bar) / l/min 0.08 (0.8) / 5.2 0.1 (1.0) / 6.0 0.13 (1.3) / 6,9 0.16 (1.6) / 7.7
without DMB
MPa (bar) / l/min 0.06 (0.6) / 5.2 0.08 (0.8) / 6.0 0.1 (1.0) / 6,9 0.12 (1.2) / 7.7
Capacity
Type
Rated overpressure
MPa (bar)
Weight
Protection class as per EN 60335
Protection mode as per EN 60529
Test marks
Approval of the Building control
Water connection (external thread)
Electrical connection
Maximum system impedance Z max in
arccordance with EN 61000-3-11 Ω
VDEW approval
Heating system
Area of use
Range of use for specific electrical
resistance/conductivity
Flow volume „On"
l/min
Table 2
Values for pressure losses also apply for minimum flow pressure according to DIN 44851/flow
volume for heating from 10 ºC to 60 ºC (∆ϑ 50 K). On the basis of DIN 1988 Part 3, Table 4,
pressure loss of 0.1 MPa (1 bar) is recommended with regard to the dimensioning of the pipe
network.
Area of application for instantaneous water heaters, related to the specific
electrical resistance of the water/specific electrical conductivity.
Details as
Specific electrical resistance
corresponding to
Specific electrical conductivity
Table 3
The values for the specific electrical resistance or electrical conductivity respectively are to be
determined on a regionally divergent basis, at different temperatures. This must be taken into
account in the assessment.
Range of use with pre-heated water (25 ºC - 55 ºC) at specific electrical resistance ≥1100 Ωcm.
2.7 Place of installation
The DEL electronic LCD is to be
installed vertically, as shown in
(over-sink or under-sink) in an enclosed area
free of frost, and as close as possible to the
water tap (dismantled units are to be stored
protected against frost, since there will
always be some residual water in the unit).
2.8 Preparing for unit instal-
lation
C
Release the cover securing screw and
remove the cover. Remove the Styropor
block (provided for protection during
transport).
In the event of under-sink
installation, it is possible to twist the
cover (not the rear wall) as in
„2.12 Completing installation").
E
Remove the rear wall lower part, by
pressing the two engagement hooks (a)
forwards (b).
DEL 18 Si
DEL 21 Si
electronic LCD electronic LCD electronic LCD electronic LCD
18
21
l
closed
1 (10)
kg
IP 25
see unit rating plate
PA-IX 7827/I
G ½
3/PE ~ 400 V
present
bare wire
especially for water with high lime content
see Table 3
Ranges of use for different references temperatures
from water analysis
Normal details
at
at 15 ºC
20 ºC
≥
900 Ωcm
≥
≤
≤
111 mS/m
≤ 1110 µS/m
≤ 1250 µS/m
F
Determine the knock-out position for
the rear wall of the unit for securing the
mounting bracket:
B
– Knock-out position 25, using the
mounting bracket provided.
– Knock-out position 27, with the unit
mounted on an existing Stiebel Eltron
DEL electronic LCD mounting bracket
position 28.
– Secure the unit mounting bracket.
– Fit water connections in accordance with
H
I
or
arrows.
– An existing three-way isolating valve can
be used.
– With the aid of the installation template,
determine the position for the cable intro-
duction point (concealed connection) and
D
(see
the retaining bracket.
– Cut the electrical connection to length
and strip the insulation
– Secure the mounting bracket in the appro-
priate manner.
DEL 24 Si
DEL 27 Si
24
27
0,4
5,2
1
0,17
≥ 3.0
at
25 ºC
800 Ωcm
≥
735 Ωcm
≤
125 mS/m
136 mS/m
≤ 1360 µS/m
. Take note of the direction
K
.
– Secure the unit with the screw bushing
(17) to the retaining strip. By using the
knurled nuts (27), any unevenness in the
wall, such as tile offsetting, can be com-
pensated for to a maximum of 20 mm.
2.9 Temperature limitation G
A limit can be set on the output temperature,
of about 43 °C, by taking the following steps:
1. Unscrew the cover fixing screw and
remove the unit cover.
2. Withdraw the thermostat fly-lead cable
plug at the unit.
3. Unscrew the 2 control unit screws and
take out the control unit.
4. Connect plug (29) in the control unit to
position „43".
5. Install the control unit.
6. Plug in the thermostat fly-lead cable plug at
the unit.
7. Install the unit cover and screw up.
2.10 Water connection H I
• Fit the components supplied.
The three-way shutoff valve must not be
used for choking the flow.
• If the water pressure is low, the pressure
loss of the unit can be improved by replac-
ing the brown flow volume limiting device
(a, DMB -12 l/min) by the disk (b) provided.
• If a thermostatic fitting is being used, the
blue flow rate limiter provided (a. DMB-
7.5 l/min) is to be used.
• Concealed screw connection
• Surface screw connection
The IP 25 protection mode (water jet
protection) is guaranteed if the
following connecting steps are carried out:
With a WKMD or WBMD Stiebel
1
Eltron surface mounted fitting (see
2
„2.15 Special accessories"):
3
1. Saw the rear wall lower part
4
order to facilitate installation (cutting
width max. 2 mm).
5
2. Use water plug G ½ (30). Water plugs
6
form part of the scope of supply of
7
Stiebel Eltron WKMD or WBMD fittings.
If third-party fittings are used, the special
8
accessory „set of 2 water plugs" is
9
required (see „2.15 Special
10
accessories").
1
11
In the case of surface fitting (see „2.15
2
12
Special accessories"):
3
1. Saw the rear wall lower part
13
4
order to facilitate installation (cutting
14
5
width max. 2 mm).
15
2. Use water plug G ½ (31).
6
3. Use ½" union nuts with insert for 12 mm
16
7
Ø soldered connections (32).
17
8
Form a junction to 12 mm copper pipe.
9
18
10
2.11 Electrical connection J
19
11
20
If the unit is being installed with re-
12
21
mote control, type FS 1, the DEL
13
22
electronic LCD electrical connection infeed
14
23
is to be fitted in the lower part of the unit
15
K
and the control line in the upper part
24
16
N
of the unit
(a).
17
The unit must be connected to the protec-
18
tive earth connection.
19
– In the case of a concealed connection, the
20
connection lead must project at least 30 mm
21
from the wall, properly insulated
22
23
24
H
I
1
2
to size in
3
4
5
6
7
8
9
10
1
11
2
12
to size in
3
13
4
14
5
15
6
16
7
17
8
18
9
19
10
20
11
21
12
22
13
23
14
24
15
16
17
18
19
K
.
20
13
21
22
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