Control of MINIB convectors

Characteristics

MINIB introduced 12V DC fan motors for its convectors in 2005, bringing energy savings of up to 80% compared with normal AC motors. Along with low energy consumption the control of the DC motor is also easier and gives improved user comfort.

This catalogue includes a series of wiring diagrams and recommendations for the various controllers available for the MINIB range of fan convectors. For specific installations of very large areas or BMS controlled systems MINIB is able to provide the necessary technical recommendations to ensure optimum operation. Please contact us for assistance.

Description of individual control systems

Control A1

(wet interior, on/off)

Max. length of connected convectors is 12 linear metres.

Control A/A1 - the simplest type of a single speed control system for dry/wet environments. The thermostat directly switches the current in either the primary or secondary circuit of the isolating transformer. Any suitable mechanical thermostat, whose contacts are rated appropriately, can be used. Thermostat contacts must be sized for either the maximum current of the secondary winding of the transformer or must be able to switch the line voltage 230 VAC/50 Hz and must be sufficiently protected against the dangerous contact voltage according to the environment, in which they will be installed when switching the primary winding of the isolating transformers. The control A1 can also be used for convectors with AC asynchronous motors used in swimming pool applications. In this case thermostats used for swimming pools (control A1) must comply with the necessary standards for coverage of el. units in specified swimming pool zones, especially if they switch the supply voltage of the primary winding of the isolating transformer.

The convectors can be connected in series if the distance from the transformer is small. The Y-connection is more suitable when the distance to the furthest convector exceeds 20m. Tapping can be made in the electrical conduit box EMK on the wall or through WAGO terminals directly under the convector cover. Wires of the convector side terminals can be crossed. Middle terminals can remain unconnected. If the middle terminals are linked, there can be only interconnected the middle terminals. When the cable with colours “black“, „black“, „brown“ is used, use the brown wire for interconnection of middle terminals of the convectors.

Control A

(dry interior, on/off)

The control with the thermostat connected on the secondary circuit side of the safety isolating transformer. The switching contact must be dimensioned for the highest switched current of the secondary winding of the safety isolating transformer TT1-DC, which can be up to 8A. Recommended for the simplest control of convectors, especially with AC motors but also with DC motors.

Control B

(dry interior, on/off, programmable thermostat)

Control B - the control for MINIB convectors with the weekly programmable thermostat MINIB TH-0108. In the year 2009 DC motors in convectors for wet interiors are supposed to be used as well so that it will be possible to use this control for convectors designed to wet interiors. Convectors are equipped with the contact thermal switch TS, which disables fan operation if the heating water temperature is too low. (This switch must be disconnected if fans are needed for forced ventilation or subcooling in summer periods).

The control with the programmable thermostat for simple control of convectors with DC motors up to the current load of ca. 7A, i.e. length of convectors is max. 12 linear metres.

Attention: On this controller JP1 and JP2 must be set for control with active signal, i.e. both pins of the jumper JP2 connected and pins no. 2-3 of the jumper JP1! One pole of the thermal switch is connected from the terminal ~ 12V to terminal REG, the other remains connected on the fourth terminal of TS. If the system is used for subcooling, the thermal switch cannot be used and the control signal wire (brown) must be connected directly to terminal REG.

The convectors can be connected in series if the distance from the transformer is small. The Y-connection is more suitable when the distance to the furthest convector exceeds 20 m.

Tapping can be made in the electrical conduit box EMK on the wall or through WAGO terminals directly under the convector cover.

Wires of the convector side terminals can be crossed. There must be only interconnected middle terminals. If the cablewith colours “black“, „black“, „brown“ is used, use the brown wire for interconnection of middle terminals of the convectors.

Control C

(dry environment, three-speed manual speed selection, programmable thermostat)

Control C - this control provides a manual speed selection. The control function is the same as control A, but in addition the manual speed selection is available. The control allows quick achievement of the set temperature after coming back from the weekend, dynamic response of the heating system during daily routine operation and quiet operation in night hours.

The control with the programmable thermostat for simple control of convectors with the manual three-level fan speed setting with DC motors. The maximum current load is 7A, i.e. length of convectors with DC motors is max. 12 linear metres.

The convectors can be connected in series if the distance from the transformer is small. The Y-connection is more suitable when the distance to the furthest convector exceeds 20m. Tapping can be made in the electrical conduit box EMK on the wall or through WAGO terminals directly under the convector cover.

Control D

(dry environment, automatic step speed control, programmable thermostat)

Control D - the automatic step control suitable for dry and wet environment. This control can be also used for heating modes in winters and subcooling in summers. Automatic multi-level control with the programmable thermostat for the control of convectors with DC motors. Maximum current load is 7A. Length of convectors max. 20 linear metres.

Control D also enables to control subcooling of the space, when sufficiently cool water is supplied to the heat exchanger. If the convector is only used for heating, it is possible to connect the thermal switch TS that will disable the function of fans when the temperature of heating water is not sufficiently high.

The convectors can be connected in series if the distance from the transformer is small. The Y-connection is more suitable when the distance to the furthest convector exceeds 20m. Tapping can be made in the electrical conduit box EMK on the wall or through WAGO terminals directly under the convector cover.

Wires of the convector side terminals can be crossed. Middle terminals can remain unconnected. If the middle terminals are linked, there can be only interconnected the middle terminals. When the cable with colours “black“, „black“, „brown“ is used, use the brown wire for interconnection of middle terminals of the convectors.

Control E1

(wet environment, automatic step speed control, programmable thermostat)

Control E1 - automatic control for convectors used in wet environment. Automatic multi-level control with the programmable thermostat for the control of convectors with AC motors. Maximum current load is 20A (27A). The length of convectors max. 6m (8m).

The convectors can be connected in series if the distance from the transformer is small. The Y-connection is more suitable when the distance to the furthest convector exceeds 20m. Tapping can be made in the electrical conduit box EMK on the wall or through WAGO terminals directly under the convector cover.

Regarding the electrical safety the thermostat can be placed in the wet environment because it is powered from batteries with the total voltage 3V and fan motors use the safe voltage 12V AC. But the thermostat should be installed in the place, where air humidity does not condensate to prevent batteries from corrosion.

Control E

(dry and wet environment, automatic speed control, programmable thermostat)

Fully automatic control of convectors with continuous speed control. Automatic continuous control with the programmable thermostat for the control of convectors with DC motors. Maximum current load is 7A. The length of convectors is max. 12m.

Control E does not allow subcooling of the space. A thermal switch TS can be used to disable fan operations. The convectors can be connected in series if the distance from the transformer is small. The Y-connection is more suitable when the distance to the furthest convector exceeds 20m. Tapping can be made in the electrical conduit box EMK on the wall or through WAGO terminals directly under the convector cover.

Wires of the convector side terminals can be crossed. Middle terminals can remain unconnected. If the middle terminals are linked, there can be only interconnected the middle terminals. When the cable with colours “black“, „black“, „brown“ is used, use the brown wire for interconnection of middle terminals of the convectors.

The electronic control was developed for the user to increase the heating comfort in the interior and to introduce floor convectors as the device that is able to react besides the standard modes “on – off“ on outside conditions in more intelligent way. The automatic control includes:

1. electronic contactless MINIB thermostat TH-0108 with a weekly program. The user is not disturbed by mechanical switching of contacts.
2. automatic fan speed control. Revolutions are continuously increased or reduced on basis of the programmed algorithm. There can be set three modes of the automatic operation suitable for a) halls and offices, b) living rooms, c) bedrooms and very quiet areas. In all cases the fan speed is continuously changed, only maximum noise levels and fan activation times are different for a variety of environment.
3. temperature sensor of the inlet water that will disable a fan operation in case, when the heating water is not heated enough. This prevents the not sufficiently heated air to be blown out from the convector.
4. light sensor – photosensor – detecting a presence of light and limiting the maximum fan speed during night hours so that the noise level during operation of the convector is minimum.
5. user‘s possibility to set the maximum fan speed. The user can set an acceptable maximum noise level according to his own sensitivity, which will be never exceeded and this level is further reduced to minimum speed during the night.
6. initial fan calibration of all convectors to the same speed so as to eliminate a loss voltage for distant convectors connected to the common safety isolating transformer TT1-DC 230/12V.

Control MT-2

(dry and wet environment, automatic speed control and control of warm air blow direction from the convector)

Control MT-2 - it is recommended to use the special control MT-2 for MT-2 convectors. These convectors are equipped with their own special electric, resp. electronic circuits. Control of MT-2 convectors with DC motors and control unit REGMINIB through the control systém Reg. MT2 with the programmable thermostat. The control is made by combination of two logic signals (four-level control). Current load is max. 10A. Length of convectors is max. 8 linear metres.

Control TE

(on/off control for electric direct heating convectors, thermostats also switches on heating spirals

Thermostat contacts must be rated for the voltage 230V/50Hz and for the current corresponding to the coil current of the auxiliary relay or contactor.

Current Imax is set by the total heat input of all switched units.

The contactor can be also a three-phase type, and then the total length of convectors can be divided into three same sections and every section can be connected to one phase. The contactor coil can be powered from any phase.

Technical information

• Regulation
• Examples of convector connections
• Physical properties
• Other information and instruction manual