Specifi Cation And Application Ranges For Contractors; Troubleshooting; For Users - STIEBEL ELTRON DHB-E 18 Si Operating And Installation Instructions

5. Specifi cation and application areas
5.1 Specifi cation
(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
VDEW approval
Heating system
Area of use
Range of use for specific electrical
resistance/conductivity
Flow volume „On"
Tabelle 3
* 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 specifi c electrical resistance
of the water/specifi c electrical conductivity.
Details as
Specifi c electrical resistance
corresponding to
Specifi c electrical conductivity
Table 4
* 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 electronic
will not start although the DHW valve is fully
open.
Intermittent cold water
Table 5
10
DHB-E 18 Si
electronic
kW
MPa (bar) / l/min 0,08 (0,8) / 5,2
MPa (bar) / l/min 0,06 (0,6) / 5,2
l/min
color blue
Ranges of use for different references temperatu-
res * from water analysis
Normes details
at 15 °C at 20 °C
≥ 900 Ωcm ≥ 800 Ωcm
≤ 111 mS/m ≤ 125 mS/m
≤ 1110 µS/cm ≤ 1250 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
18 21
0,1 (1,0) / 6,0
0,08 (0,8) / 6,0
7,5 7,5
blue
1 MPa (10 bar)
see unit rating plate
especially for water with high lime content
at 25 °C
≥ 735 Ωcm
≤ 136 mS/m
≤ 1360 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
closed
3,6 kg
1
IP 25
G ½
3/PE ~ 400 V
present
bare wire
see Table 4
≥ 3,0 l/min
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