Siemens DS20022 Gebrauchsanleitung Seite 15

Pressure reducing valve
The floor‑standing water heater is designed to operate at pres‑
sures not exceeding 6 bar. A pressure reducing valve must be
situated in the cold‑water pipe if the water mains pressure
exceeds 5 bar. If the water mains pressure exceeds 10 bar, a
second pressure reducing valve must be connected in series.
Installation example (Fig. IV.)
1 Thermostat
2 Time switch
3 Circulation pump
4 Non‑return valve
5 Outlet valve
6 Safety valve
7 Through‑way shutoff valve
8 Test connection piece for manometer
9 Test valve
10 Pressure reducing valve
(only when water pipe pressure exceeds 5 bar)
11 Cold‑water inlet
The fittings and safety devices indicated in the diagram must
be used for the installation and they must be fitted in the
sequence shown (see DIN 1988 or local regulations).
For easier installation we recommend the use of our com‑
pact safety valve units.
– DS20022: BZ 31320
– DS30022: BZ 31420
– DS40022: BZ 31420
If a central battery (thermostat battery) is used, a device must
be fitted directly to the hot‑water outlet of the floor‑standing
water heater, in order to measure the cut‑out temperature.
V. Electrical connection
Electrical installation must only be carried out by an elec‑
■
trician from the power supply company.
The power supply must only be connected after the water
■
supply. Connections must be carried out according to the
circuit and terminal diagrams. The ratings permitted by
the power supply company for primary/rapid heating, as
well as the heating duration, must be observed. The inter‑
nal circuitry must not be altered. The rating plate, norms,
regulations and guidelines must be observed.
Floor‑standing water heaters have special connections on
■
the terminal strip for control cables and contactors.
The protective conductor terminal is indentified by the
■
protective conductor sign.
An all‑pole disconnecting device with a min. 3 mm gap
■
construction must be fitted by the installation company.
Attention!
The appliance must not be connected by a
two-pole-and-earthing-pin plug.
en
Connection work
Remove switchroom cap.
■
Push power cable and control lead through the cable inlet
■
and connect in accordance with the circuit diagram.
Connect the protective conductor to the protective
■
conductor terminal.
Tighten the screwed connections of the cable inlets.
■
Place the rating stickers in the position marked on the
■
rating plate.
Fit the switchroom cap.
■
Rated voltage
Supply-voltage
Primary heating
8 h
4 h
Rapid heating
Circuit diagram (Fig. A)
Mandatory circuit diagram inside the appliance.
Subject to change without notice.
Switch b2 has been preset at the factory to position "I"
(heating duration 8 hours).
b1 Push‑button for rapid heating
b2 Selector switch for primary heating
k1 Contactor
k2 Contactor
f1 Thermostat and thermal cut‑out
r1, r2, r3 Heaters, each 2 kW/230 V~
Other connection options (Fig. B)
1 Power supply company contact
When operating without a controller from the power supply
company, place a bridge between L1 and 5.
Depending on the power supply company, the period in
which off‑peak power is supplied may be restricted.
Primary heating can therefore be set with selector switch b2,
so that the floor‑standing water heater heats up in either 4
or 8 hours.
If the power supply company does not permit peak‑rate heat‑
ing, the push‑button must be covered with the plastic cap
situated in the switchroom.
Dual meter measurement (comply with phase coincidence)
(Fig. C)
1 Power supply company contact
k1 Contactor
k2 Contactor
1/N/PE – 230 V~: without broken lines
3/N/PE – 400 V~: with broken lines
1/N/PE 3/N/PE
230 V~ 400 V~
2 kW 2 kW 3 kW 4 kW
4 kW 4 kW 6 kW 6 kW
4 kW 6 kW
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