منظم الحرارة RT-10

Functionalities

Temperature controller RТ-10, which includes the electronic module and resistive temperature transducers, together with actuator is used for the control and regulation of temperature in systems of heating and hot water supply.

Depending on a variant of performance the controller can have one or two independent channels of regulation. Each channel allows to maintain the temperature in a control loop according to temperature dependence for workdays and weekends, to correct the temperature value depending on temperature of external air or to limit the maximal temperature of the heat-carrier in the return pipeline, forming a corresponding gate voltage for actuator. Irrespective of temperature regulation each channel can operate the pump according to independent time profile.

The single-channel controller can be used in a contour of heating or hot water supply.

The two-channel controller can be used for independent simultaneous regulation in a contour of heating and a contour of hot water supply or other combination of independent contours.

Parameters of one channel of regulation:

Each of regulation channels can use up to three temperature sensors and common for both channels the sensor of external air temperature. Connection to sensors is carried out by 4 wire cable (length up to 200 m). The temperature measurement range : from - 60°С to + 160°С. The maximal error of the electronic module at temperature measurement - no more ±0.4°С (typical value of an error ±0.1°С).

There are two independent outputs - analog and key:

Analog output - for connection of an actuator operated by a voltage (in a range 0 - 10V at load> 1kohm); a key output - for forming of activation signal for the actuator of the circulating pump (~24V x 0,6А, 50Hz).

Fig. 1. Application of one channel of temperature controller RТ-10

The temperature is set according to time-temperature dependence (8 points per day with increment of 10 minutes, a range of temperature adjustment for each point is 10 … 99°С with increment of 1°С).

It is possible to set special temperature dependence for weekends and holidays.

Correction of set temperature at change of ambient temperature is carried out under the linear dependence of weather indemnification which is set by two points (a range of the ambient temperature  -  minus 50 … plus 50°С, a range of the temperature shift - minus 25 … plus 25°С).

There is a mode of restriction for the maximal temperature of the heat-carrier in the return pipeline: when the temperature of the heat-carrier in the return pipeline exceeds a preset value, the controller transfers into a mode of restriction of temperature of "return water" and remains in it until the temperature in the return pipeline will not below a preset value. Value of the maximal temperature in the return pipeline depends on temperature of the heat-carrier in the supply pipeline and is set by the linear dependence of "return water" (it is set by two points). Ranges of temperature settings: in the supply pipeline - 10 … 150°С, in the return pipeline - 10 … 99°С).

Regulation is carried out according to PI or PID controls. Set parameters: proportional factor (0.1 … 25.0), a constant of integration (1 … 9999 sec), a constant of differentiation (0 … 99 sec). Parameter deviation from preset values - no more ±10 %.

Key output control is carried out under time dependence separately for workdays and holidays and weekends. Each dependence allows to set two cycles of switching on/switching off per day. The discrecity of time setting is 10 minutes.

Fast change of device configuration is carried out in the menu. Variants of a configuration:

1. The one Resistive Temperature Transducer (RTD) is used for regulation. Regulation is carried out by one temperature according to the time-temperature dependence, the weekend dependence and the specified operating mode.
2. Two RTD are used for regulation. Regulation is carried out by one temperature according to the time-temperature dependence, the weekend dependence and the specified operating mode. Correction by ambient temperature is carried out according to the dependence of weather indemnification.
3. Three RTD are used for regulation. Regulation is carried out by one temperature according to the time-temperature dependence, the weekend dependence and the specified operating mode. Restriction for the maximal value of the heat-carrier temperature in the return pipeline is carried out. It depends on the heat-carrier temperature in the supply pipeline and is set by the "return water temperature" dependence. 
4. Four RTD are used for regulation. Regulation is carried out by one temperature according to the time-temperature dependence, the weekend dependence and the specified operating mode. Correction by ambient temperature is carried out according to the dependence of weather indemnification. Restriction for the maximal value of the heat-carrier temperature in the return pipeline is carried out. It depends on the heat-carrier temperature in the supply pipeline and is set by the "return water temperature" dependence. 
5. Switching of operating modes is carried out in the menu. Possible operating modes:

• «Full» – regulation is carried out under time-temperature dependence and weekend dependence. Thus correction by ambient temperature and "return water temperature" is carried out according to the set configuration of the channel. The circulating pump works under dependences for workdays and weekends.
• «Workday» – regulation is carried out under time-temperature dependence. Thus correction on ambient temperature and «return watertemperature» is carried out according to the set configuration of the channel. The circulating pump works under dependences for workdays.
• «Weekend» – regulation is carried out under dependence for weekend. Thus correction by ambient temperature and «return water temperature» is carried out according to the set configuration of the channel. The circulating pump works under dependences for weekends.
• «Safety» – in this mode the control channel provides only freezing protection (the temperature in a control loop doesn't set down below 5°С). When the ambient temperature set down below 5°С the circulating pump is switched on. 

There is an opportunity of automatic switching of a controller into a summer operating mode (switching-off of regulation and a signal for switching-on of the pump) at excess in certain value (10 … 30°С) of average ambient temperature during specified time (1 … 9 day), and also an opportunity of forming of a special signal on an analog output for reciprocation of the control valve (with an interval 72 hours) and a signal on a key output for periodic switching-on of the pump (an interval between switchings is 72 hours).

General characteristics:

• Automatic saving of last 500 measured and set temperatures in archive. The interval of recording in archive is set in a range from 1 up to 90 minutes.
• All set parameters are saved in non-volatile memory .
• Restricted access to changeable parameters via the password.
• The information is represented on 4-row 16-symbolical display.
• Direct connection to the personal computer (RS-232) with an opportunity to set regulation parameters in the software "Sempal DM".
• The possibility of connection RS-485 (allows to contact with a controller via the common modem connected to the heat meter SVTU-10M).
• Protection class of the case IP65. 
• Supply voltage is ~24V, 50 Hz.
• Power consumption is no more than 5 VA.
• Overall dimensions of the electronic module are 180 x 100 x 35 mm.

The controller also can be delivered in the complete set with standard device enclosure, that allows to connect easily to it any control valves (see Figure 2).

Fig. 3. Enclosure layout for mounting of the controller

The note: the present device enclosure configuration is presented for a two-channel variant of controller RT-10. For a single-channel variant, the relay of switching-on of the actuator P2 and connector block KV3 are not used and can be absent.