ROTOTERM MR-TR
5
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CONNECTION OF THE REGULATION MOTOR
After the regulation motor is mounted to the mixing valve (for mounting see chapter “Instructions for mounting the
regulation motor”), connect the motor to the terminal pins in the connection box of the controller. Should the closing
direction be changed, change the connecting wires on terminal pins 12 and 14.
We recommend the use of our regulation motors:
grey
black
grey
black
MV 120/09E
MV 120/210
MV 120/360
MV 120..540 (EUROMIX)
CONNECTING THE CIRCULATION PUMP
The controller controls the circulation pump whenever there is a signal for heating and shuts it off as soon as the
heating water line is cooled down bellow the set temperature (see “Setting pump switch off” - parameter [c]). It shall
be connected to terminal pins 10 and 11.
Recommendation:
As an extra precaution for
under floor heating we recommend use
of regulation motor series MV 120/210 for
mixing valves up to DN 40 or series MV
120/360 for larger mixing valves. Advantage
of these two regulation motors is, that it can
be set an angle of opening of the mixing
valve. This way the maximum temperature
of heating water coming into under floor
heating system can be limited.
Recommendation:
For under floor heating we recommend in stallation of an extra safety bimetal thermostat
on the mixed flow line. The ther mo stat shall be set to some 50°C and shall switch off the
cir cu lation pump after the tem pera ture in the heating wa ter line ex ceeds 50°C. The use of
ther mo stat is rec ommended as precaution in order to prevent hot wa ter to breaking into
under floor heating system.
bi metal
ther mo stat
SENSOR MOUNTING
All the connecting cables of temperature sensors and indoor units can be extended, but you have to some basic rules to
consider:
1. Sensors cables do not lead in parallel with the mains voltage cables (220V/50Hz). There can appears current stroke, which
cause voltage induction and it can damage the controller or sensors. If there is no other way then parallel minimum distance is 10cm
between them. It is allowed to guide the sensor’s cable perpendicular crossing voltage cables.
2. If the distances between sensors and controller are larger over 15 meter it is recommended the installation of VDR resistance
of 25V. It is installed by soldering at the point where the original sensor’s wire extended to the other cable wire (see Figure 2).
3. Extending the sensor cable is recommended by shielded telephone, shielded data or any other for that purpose cable cross section
0.5 mm ² or more (for example JY (St) 1X 2X0,6). These cables prevent the transmission of interference or noise from the environment
that would cause improper operation or to reset the controller. Most often is a shield of aluminium foil and extra noninsulated - shield
wire. Connection should be undertaken in a manner described below (see Figure 1 and the recommendation of experts).
4. By installation is necessary to provide mechanical protection of sensors and wires, and protection against atmospheric
influences.
Recommendation of experts:
During the laying of cables is needed to
decide the path-line, which is not near the
high voltage or high frequency electrical
sources (power cables, cables to various
appliances: pump, motor actuators, boiler,...).
Common ground at one point is first
condition to operate without interference. It is
recommended earthing of protective shield
cable to the power connection, which is in
the controller (the ground terminal) or in the
control, distribution cabinet. The other end of
the cable connected to the sensor should be
equipped in accordance with the procedure
in Figure 1 and these instructions.
On the side where is extended the original sensor, removable part of the insulation in the shielded wire turn back to connect cable
shield. All together squeeze good, and by wrapping the insulating tape, taking care of protection shield wires do not extend the
scope of the connection of two signal wires. Each protruding wire can become a source of new interference, that why it is necessary
to make this connection especially with care.
In this way it is assured the best possible protection of sensors, and save yourself a bunch of nerves and the spend time in case
of any errors due to disturbances.
Figure: 2
VDR resistor
Thermo
shrinkable tube
Sensor’s
cable
Extending
cable
Protection wire
Signal wires
Signal wires
Protection wire turn
back to cable shield and
insulate them both
Insulated band
Figure: 1
