10
Illustr. 5.1 Check valve opened
Isolation function inactive: Check valve opened, flow
is possible in both directions.
During heating operation, the check valve must be set
to operating position.
5.2 Check valve
During heating operation, the handles of the ball valves
must be in vertical position.
Operating position: Check valve closed, passage only
in flow direction.
When putting the system into operation and during
maintenance work (filling and flushing), the check valve
must be opened.
5.3 Setting of the bypass at the three-way mixing
valve (“Regumat M3“)
The pump groups with three-way mixing valve are
additionally equipped with a bypass with manual
presetting at the three-way mixing valve. When leaving
the factory, the bypass is closed (slot of the bypass
stem turned by 90° towards the bypass channel,
position “off”, see illustr. 5.2).
By turning the bypass stem by 90°, i.e. slot running
parallel to the bypass channel, position “on”, the
maximum flow rate can be reached.
Kv values:
Mixing valve (I
➝
II) and bypass stem
fully opened:
Kv = 4.7
Mixing valve closed (III
➝
II),
bypass opened
Kv = 2.6
Mixing valve fully opened (I
➝
II),
bypass closed
Kv = 4.3
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.
WARNING
!
Illustr. 5.2 Bypass setting
Safety
screw
5.4 Actuator (“Regumat M3“)
The electrical connection must be carried out in
accordance with the valid regulations!
WARNING
!
The pump groups with mixing valve are supplied with
an actuator.
The following models are available:
Actuator NR230 for 230V
Actuator NR24 for 24V
The actuators NR24 and NR230 are used for the
motorised actuation of 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 stop is reached (supply closed, bypass
opened).
Technical data actuator:
Operating current
NR230:
230V 50Hz
NR24:
24V 50Hz
Protective system
II (shockproof)
Torque
5 Nm
Operating time
140 s
Manual setting
mechanical gear release
Ambient temperature
0°C up to +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 malfunction of the
control system, the actuator can be converted to
manual operation with the help of an additional rotary
knob.
Return
Supply
