Area Of Application; Troubleshooting; For Contractors - STIEBEL ELTRON DHB-E 18 Si Gebrauchs- Und Montageanweisung

5. Specification and application areas
5.1 Specification
(details listed on the type plate apply)
Type
Rated outputl
Pressure drop*
with DMB
without DMB
Flow rate limiter (DMB)
Capacity
Type
Rated overpressure
Weight
Protection class as per DIN EN 60335
Protection mode as per EN 60529
Test marks
Water connection (external thread)
Electrical connection
Heating system
Area of use
Range of use for specific electrical
resistance/conductivity
Flow volume „On"
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.

5.2 Area of application

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.

6. Troubleshooting

Fault
The heating system inside the DHB-E ... Si elec-
tronic will not start although the DHW valve is
fully open.
Intermittent cold water
Table 4
16
DHB-E 18 Si
electronic
kW 18
MPa (bar) / l/min 0,08 (0,8) / 5,2
MPa (bar) / l/min 0,06 (0,6) / 5,2
l/min 7,5
color blue
Ranges of use for different references temperatures * from water analysis
Normes details
at 15 °C
≥ 900 Ωcm
≤ 111 mS/m
≤ 1110 µS/cm
by the user
Cause
No voltage
The start-up volume required to start the heater
has not been reached. Contamination or scaling
of percolators in the valves or shower heads
Heating system faulty
The air sensor senses the presence of air in the
water and briefly switches the heater off

for contractors

DHB-E 21 Si
electronic
21
0,1 (1,0) / 6,0
0,08 (0,8) / 6,0
7,5
blue
closed
1 MPa (10 bar)
3,6 kg
IP 25
see unit rating plate
G ½
3/PE ~ 400 V
bare wire
especially for water with high lime content
see Table 3
≥ 3,0 l/min
at 20 °C
≥ 800 Ωcm
≤ 125 mS/m
≤ 1250 µS/cm
DHB-E 24 Si
electronic
24
0,13 (1,3) / 6,9
0,10 (1,0) / 6,9
8,5
green
0,4 l
1
at 25 °C
≥ 735 Ωcm
≤ 136 mS/m
≤ 1360 µS/cm
Remedy
User / Contractor:
check the fuses in your fuse box.
User / Contractor:
clean and/or descale
Call service department / contractor:
Test heater and replace if necessary
Equipment starts again after a few seconds
DHB-E 27 Si
electronic
27
0,16 (1,6) / 7,7
0,12 (1,2) / 7,7
8,5
green