Manual

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INSTALLATION
INSTALLATION
7.12 Technical data
(the data on the unit rating plate are applicable)
Hydraulically controlled instantaneous water heaters
Type DHF 13 C
compact
control
DHF 13 C-A
compact
control
DHF 15 C
compact
control
DHF 18 C
compact
control
DHF 21 C
compact
control
DHF 24 C
compact
control
DHF 12 C1
compact
control
DHF 13 C3
compact
control
Part no. 074301 222214 074302 074303 074304 074305 182137 185708
Rated voltage
Partial power
Rated power
Stage
Stage
•
••
V
kW
kW
400
6.6
13.2
400
6.6
13.2
400
7.5
15
400
9
18
400
10.5
21
400
12
24
220
8
12
230
8.8
13.2
230
6.6
13.2
Min. flow rate to activate Stage
Stage
•
••
l/min
l/min
2.5
3.7
3.0
4.5
3.0
4.5
3.9
5.9
4.4
6.4
4.9
7.6
2.5
3.7
2.5
3.7
2.5
3.7
Flow rate limiter l/min 4.5 6.5 6.5 7.0 7.5 8.0 4.5 4.5 4.5
Pressure loss*
Flow rate
MPa
l/min
0.05
3.7
0.055
4.5
0.055
4.5
0.06
5.9
0.06
6.4
0.07
7.6
0.05
3.7
0.05
3.7
0.05
3.7
Nominal water volume l 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6
Type of construction closed x x x x x x x x x
Rated overpressure MPa 1 1 1 1 1 1 1 1 1
Weight kg 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0
Protection class to EN60335 1 1 1 1 1 1 1 1 1
Protection mode to EN60529 IP 24 IP 24 IP 24 IP 24 IP 24 IP 24 IP 24 IP 24 IP 24
Test mark, see unit rating plate x x x x x x x x x
Water connection external thread G ½ G ½ G ½ G ½ G ½ G ½ G ½ G ½ G ½
Electrical connection
3/PE ~ 400 V x x x x x x
1/N/PE ~ 220 V x
1/N/PE ~ 230 V x
3/PE ~ 230 V x
Max. mains impedance Z max to
EN61000-3-11
Ω - - - - - 0.44 0.15 0.14 0.45
Heating element Copper tubular
heating elementr x x x x x x x x x
Cold water inlet °C ≤ 20 ≤ 30 ≤ 20 ≤ 20 ≤ 20 ≤ 20 ≤ 20 ≤ 20 ≤ 20
Use in waters
Total alkaline earths mol/m³ ≤ 2.5 ≤ 2.5 ≤ 2.5 ≤ 2.5 ≤ 2.5 ≤ 2.5 ≤ 2.5 ≤ 2.5 ≤ 2.5
Overall hardness (earlier unit) °d ≤ 14 ≤ 14 ≤ 14 ≤ 14 ≤ 14 ≤ 14 ≤ 14 ≤ 14 ≤ 14
Hardness range (earlier unit) Inclusive of 2 (me-
dium hard) x x x x x x x x x
Table 3
* Pressure drop values also apply to the minimum flow pressure in accordance with DIN44851 / Flow rate for heating from 10 °C to 55 °C
(∆-ϑ 45 K). A pressure drop of 0.1MPa (1 bar) is recommended for pipe network dimensioning, in line with DIN 1988 Part 3, Table 4.
7.13 Fault finding - qualified installer
Cause Cause » Remedy
Unit does not switch on. Water pressure in cold water pipe too low. Descale or replace showerhead/Perlator®.
Strainer in 3-way valve (6) fouled. Clean strainer (
D
, 22).
Differential pressure switch (10, control valve MRC)
with flow rate controller does not switch on in spite
of the hot water tap being turned fully on.
Necessary switch-on quantity to switch on the hea-
ting output is not reached.
Clean strainer (
D
, 22).
Check water pressure.
Unit does not produce hot water in spite of an audible
switch-on noise by the differential pressure switch.
Safety temperature limiter (12) has tripped, possibly
due to:
Intlet temperature too high. Check intlet temperature.
Control valve (MRC) faulty. Check and if necessary replace control valve. Rinse
heating-system of unit, in order to avoid over-hea-
ting. Press reset button (13).
Element scaled up. De-scale or replace element.
Heating system does not heat water. No voltage. Check fuse (house installation).
Heating system faulty. Replace tubular heating element heating system (11).
Table 4