STIEBEL ELTRON DHB-E 18 Si, Operating And Installation Instructions, Page: 16 / 44

16
6. Troubleshooting
by the user
Table 4
5. Specification and application areas
for contractors
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.
Type DHB-E 18 Si
electronic
DHB-E 21 Si
electronic
DHB-E 24 Si
electronic
DHB-E 27 Si
electronic
Rated outputl kW 18 21 24 27
Pressure drop*
with DMB
without DMB
MPa (bar) / l/min
MPa (bar) / l/min
0,08 (0,8) / 5,2
0,06 (0,6) / 5,2
0,1 (1,0) / 6,0
0,08 (0,8) / 6,0
0,13 (1,3) / 6,9
0,10 (1,0) / 6,9
0,16 (1,6) / 7,7
0,12 (1,2) / 7,7
Flow rate limiter (DMB) l/min
color
7,5
blue
7,5
blue
8,5
green
8,5
green
Capacity 0,4 l
Type closed
Rated overpressure 1 MPa (10 bar)
Weight 3,6 kg
Protection class as per DIN EN 60335 1
Protection mode as per EN 60529 IP 25
Test marks see unit rating plate
Water connection (external thread) G ½
Electrical connection 3/PE ~ 400 V
Heating system bare wire
Area of use especially for water with high lime content
Range of use for specific electrical
resistance/conductivity
see Table 3
Flow volume „On“
≥
3,0 l/min
Fault Cause Remedy
The heating system inside the DHB-E ... Si elec-
tronic will not start although the DHW valve is
fully open.
No voltage User / Contractor:
check the fuses in your fuse box.
The start-up volume required to start the heater
has not been reached. Contamination or scaling
of percolators in the valves or shower heads User / Contractor:
clean and/or descale
Heating system faulty Call service department / contractor:
Test heater and replace if necessary
Intermittent cold water The air sensor senses the presence of air in the
water and briefly switches the heater off
Equipment starts again after a few seconds
5.1 Specification
(details listed on the type plate apply)
5.2 Area of application
Area of application for instantaneous water heaters, related to the specific electrical resistance of the water/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.
Details as Ranges of use for different references temperatures * from water analysis
Normes details
at 15 °C at 20 °C at 25 °C
Specific electrical resistance
corresponding to
Specific electrical conductivity
≥ 900 Ωcm
≤ 111 mS/m
≤ 1110 µS/cm
≥ 800 Ωcm
≤ 125 mS/m
≤ 1250 µS/cm
≥ 735 Ωcm
≤ 136 mS/m
≤ 1360 µS/cm