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The safety screw of the bypass stem is marked with a coat of lacquer.
This safety screw must never be loosened when the system is under pressure!
There is danger that hot water may escape uncontrollably.
Having completed all installation work and any required setting of the differential pressure relief
device, the insulation is mounted. Install back insulation first. The insulation is connected to the
components of the PWW with the help of a squeeze connection and can thus not fall down. The
cables of the pump and the actuator are fed downwards through the openings of the insulation.
Mount front insulation and squeeze it onto the back insulation firmly (squeeze connection) whilst
holding the back insulation.
The PWW are supplied with an actuator.
Models: PWW with actuator NR 230 for 230 V
PWW with actuator NR 24 for 24 V
The actuators NR 24 and NR 230 are used for the motorised actuation of PWW three- and four-
way mixing valves.
The actuators can be activated via any commercial control system with a three point output. If
the actuator rotates clockwise, the flow temperature increases until the limit stop of the actuator
is reached (supply opened, bypass closed). The flow temperature drops if the actuator rotates
anticlockwise until the opposite limit stop is reached (supply closed, bypass opened).
Technical data:
Operating voltage: NR 230: 230V 50 Hz
NR 24: 24V 50 Hz
Protective system: II (protective insulation)
Torque: 5 Nm
Operating time: 140 s
Manual setting: mechanical gear release
Ambient temperature: 0°C – +50°C
Length of cable: 2.2 m
The angle of rotation is limited to 90°. Having reached the limit
stops, the actuator is switched off electrically and is without
current. In case of a malfunction of the control system, the
actuator can be converted to manual operation with the help of
an additional rotary knob.
Installation instructions for the connection to an PWW three-way mixing valve:
– Mount antirotation device (1) onto the valve body.
– Push adapter (2) onto the spindle of the mixing valve (3) until stop. Ensure flat surfaces on
spindle and adapter are aligned!
– Set spindle of the mixing valve in such a way that the nose of the
adapter points downwards in the direction of the axis of the
connection thread. In this position, the supply is closed by the
spindle of the mixing valve (bypass completely opened, cold).
– Place actuator (4) onto the shaft of the mixing valve.
– Place rotation indicator (5) onto the actuator as illustrated.
– Slip handle for manual setting (6) onto the shaft of the mixing
valve with the arrow being in the blue zone (factory setting:
Anticlockwise sense until stop, operating position "A" automatic
operation). Introduce and tighten screw (7) together with the
serrated lock washer.
Installation in intermediate position:
Factory setting misaligned – actuator has not reached limit stop.
– Place actuator onto the shaft of the mixing valve.
– Set operating switch to manual operation.
– Place rotation indicator onto the actuator as illustrated.
– Push handle for manual setting onto the shaft of the mixing
valve.
Safety note:
The electric connection must be carried out
in accordance with the regulations.
1
Installation threeway mixing valve
3
2
"Nose"
5
blue
7
4
red
6
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