Electrical Connection; Commissioning; Ball Valve Positions / Backflow Preventer (Gravity Break) - meibes UK Instructions De Montage Et De Fonctionnement

2.3 Electrical connection

Electrical connection work may only be carried out by qualified electricians. The VDE guidelines and the provisions of the responsible ener-
gy utility company must be observed.
I. Connect the recirculation pump to the power supply. This should only be operated on demand, with it usually being controlled via
the boiler control unit. Some controllers enable the speed regulation of the selected pump to be externally controlled.
II. The actuator with integrated temperature regulation (constant heat regulation set) is connected in parallel with the power supply to the
pump (230V, 50 Hz); there is no standby operation and no controlled opening while the pump is not in operation. Continuous current is
possible. Connection and operation instructions can be found in the supplied "Technical Information" for the actuator. Please check the
direction of rotation. Adjust this if necessary using the DIP switch in a currentless state.
III. The actuator without an integrated regulation of the temperature is controlled by an external controller.
The mixer closes or opens depending on which wire is supplied with 230V / 50 Hz.
A brown B blue C white
IV. A safety temperature limiter (STW) interrupts the power supply to the pump if the set temperature is exceeded and switches it
back on if it drops below. The STW is therefore connected in series with the pump.

2.4 Commissioning

2.4.1 Ball valve positions / backflow preventer (gravity break)

Some ball valves include an integrated backflow preventer (RV) or gravity break (SB). These are individually marked. The RV can be opened
manually by turning the rotating handle by approx. 45°.
45° (flush, drain):
Ball valve open, RV open
0° (normal operation):
Ball valve open, RV closed
M
~
1 2
A B
L1 N L1
90° (service):
Ball valve closed, RV open
3
C
15