Wired remote control for supply ventilation. Algorithm for controlling supply and exhaust ventilation. Tasks of ventilation systems
In case control unit merged:
power section: designed to control servo drives of air valves, fans and circulation pumps;
control part: designed to control automation and protect the power part.
Are made in the hinged case of wall execution:
modular plastic hinged enclosures with a transparent cover from TEKFOR, degree of protection - IP65 with the cover closed and IP45 with the cover open;
hinged modular metal cases, degree of protection – IP31 (IP54) with the lid closed.
All control and indication elements are located:
behind a transparent cover (plastic cases);
on the front door of the unit (metal cases).
The power part of the unit consists of automatic switches, contactors, relays, light indicators and terminals. Depending on the configuration of the ventilation system you ordered, we can implement any of your projects on a freely programmable controller. All ventilation systems are controlled by controllers from Segnetics (Pixel), Siemens, ELKO (TER-9).
Power supply of control cabinets -220 V AC (+10%/-10%) 50 Hz with ground wire or 380 V AC (+10%/-10%) 50 Hz with neutral and ground wire, depending on the modification. Operating temperature range environment- from +50 to +400°С. Relative humidity in the room - 95%.
The control units are designed for indoor installation in a dust-free, dry, chemical-free environment.
Extensions
Functions of SBU control units
| Standard | Extended |
|---|---|
| manual start and stop from the control unit; connection of the outdoor temperature sensor; connection of the supply air temperature sensor; connection of the return heat carrier temperature sensor; control of the condition of thermal contacts of the supply and exhaust fan; servo control air valve(230 V); engine protection circulation pump against overload and short circuit; proportionally - integral control of the coolant valve actuator; protection of the water heater from freezing by supply air temperature (capillary thermostat); protection of the water heater against freezing by the temperature of the return heat carrier; protection of the freon cooler from freezing by supply air temperature (capillary thermostat); protection of the electric heater against overheating; delay for switching off the supply fan with an electric heater (blowing); filter contamination control; system shutdown on signal fire alarm; indication on the liquid crystal display of the set and current parameters of the system; light indication "work"; logging of emergency events; password protection of the service menu. |
protection of the supply and exhaust fans by a differential pressure switch on the fan (belt break); operation of fans with a frequency converter; connection of the room air temperature sensor (cascade control); temperature sensor connection extract air; light indication "accident"; remote control unit; air valve servo control (24V); connection of additional fans; two-stage control of the compressor and condenser unit; five-stage control of an electric heater; mixing chamber control; protection of the rotary heat exchanger or plate heat exchanger from freezing; control of a surface or steam humidifier; work on the built-in weekly timer; proportional - integral control of the cooler valve servomotor; proportional - integral control of adjustable recirculation dampers; proportional - integral damper control; reduction in the frequency of rotation of fans, in cases of lack of performance of heating devices; non-volatile memory; Modbus and SCADA support; maintenance of air quality and CO. |
Supply ventilation automation
| Completeness | Sensors |
|---|---|
| Specification. Certificate of conformity. Package. |
Air damper servo 220 V with spring return - 1 pc. |
| Completeness | Sensors |
|---|---|
| Passports for all automation devices included in the control unit. Functional diagram ventilation system. Schematic electrical circuit. Specification. List of connected devices. Operating Instructions (on the included CD). Certificate of conformity. Package. |
Duct temperature sensor STK-1 NI-1000 TK5000 - 1 pc. Outdoor air temperature sensor STK-1 NI-1000 TK5000 - 1 pc. Temperature sensor for pipes VSN NI-1000 TK5000 - 1 pc. Room temperature sensor STR Ni 1000 TK5000 - 1 pc. (optional). Freeze protection thermostat for air KP-61 (AZT-6) - 1 pc. Air damper servo 220V with spring return - 2 pcs. |
| Completeness | Sensors |
|---|---|
| Hinged plastic block with transparent cover IP65 size 560x300x150 mm. Passports for all automation devices included in the control unit. Functional diagram of the ventilation system. Schematic electrical circuit. Specification. List of connected devices. Operating Instructions (on the included CD). Certificate of conformity. Package. |
Duct temperature sensor STK-1 NI-1000 TK5000 - 1 pc. Outdoor air temperature sensor STK-1 NI-1000 TK5000 - 1 pc. Temperature sensor for pipes VSN NI-1000 TK5000 - 1 pc. Room temperature sensor STR Ni 1000 TK5000 - 1 pc. (optional). Freeze protection thermostat for air KP-61 (AZT-6) - 2 pcs. Differential pressure switch DM-500 (DPD-5) filter dust content - 1 pc. Differential pressure switch DM-500 (DPD-5) broken belt - 1 pc. (optional). Air damper servo 220V with spring return - 1 pc. Frequency converter - 1 pc. |
| Completeness | Sensors |
|---|---|
| A hinged plastic block with a transparent cover IP65 (TER-9), a hinged metal block (Pixel), the block size depends on the electric power. heater. Passports for all automation devices included in the control unit. Functional diagram of the ventilation system. Schematic electrical circuit. Specification. List of connected devices. Operating Instructions (on the included CD). Certificate of conformity. Package. |
Duct temperature sensor STK-2 NTC 12kOm (STK-1 NI-1000 TK5000) - 1 pc. Outdoor air temperature sensor STK-1 NI-1000 TK5000 - 1 pc. (SBUP-E-30). Room temperature sensor STR Ni 1000 TK5000 - 1 pc. (optional, SBUP-E-300). Differential pressure switch DM-500 (DPD-5) filter dust content - 1 pc. Differential pressure switch DM-500 (DPD-5) broken belt - 1 pc. (optional). Air damper servo 220V with spring return - 1 pc. |
| Completeness | Sensors |
|---|---|
| Hinged plastic block with transparent cover IP65 size 560x408x150 mm. Passports for all automation devices included in the control unit. Functional diagram of the ventilation system. Schematic electrical circuit. Specification. List of connected devices. Operating Instructions (on the included CD). Certificate of conformity. Package. |
Duct temperature sensor STK-1 NI-1000 TK5000 - 1 pc. Outdoor air temperature sensor STK-1 NI-1000 TK5000 - 1 pc. Temperature sensor for pipes VSN NI-1000 TK5000 - 1 pc. Room temperature sensor STR Ni 1000 TK5000 - 1 pc. (optional). Freeze protection thermostat for air KP-61 (AZT-6) - 1 pc. Differential pressure switch DM-500 (DPD-5) filter dust content - 1 pc. Differential pressure switch DM-500 (DPD-5) broken belt - 2 pcs. Air damper servo 220V with spring return - 3 pcs. |
| Completeness | Sensors |
|---|---|
| Hinged plastic block with transparent cover IP65 size 560x408x150 mm. Passports for all automation devices included in the control unit. Functional diagram of the ventilation system. Schematic electrical circuit. Specification. List of connected devices. Operating Instructions (on the included CD). Certificate of conformity. Package. |
Duct temperature sensor STK-1 NI-1000 TK5000 - 1 pc. Exhaust air temperature sensor STK-1 NI-1000 TK5000 - 1 pc. Outdoor air temperature sensor STK-1 NI-1000 TK5000 - 1 pc. Room temperature sensor STR Ni 1000 TK5000 - 1 pc. (optional). Differential pressure switch DM-500 (DPD-5) filter dust content - 2 pcs. Differential pressure switch DM-500 (DPD-5) broken belt - 2 pcs. (optional). Air damper servo 220 V with spring return - 2 pcs. |
Ordering example SBU control unit
SWUP-W-3-R-3-R-F- where,
SWUP— Type of control unit:
SBUP– control unit with Pixel controller; SBUS - control unit with Siemens controller;
SBUT– control unit with TER-9 controller; SBUV - fan control unit (without controller);
SBUZ- Control block air curtain(without controller).
W- Type of heater (W - water; E - electric)
3
- Connection of the first fan / external control device (1 - single-phase; 3 - three-phase)
R- Control of the external device of the first fan (may be absent)
3
- Connection of a second fan / external control device (1 - single-phase; 3 - three-phase; 0 - absent)
R- Control of an external device of the second fan (may be absent)
F — Additional option- freon cooler (may be missing)
Control algorithm supply and exhaust ventilation
Algorithm for automatic control of supply systems
1. The choice of the air conditioner operation mode depending on the season is carried out from the control panel or from the operator's workstation:
2. Description of the operation of air conditioning systems
Starting and stopping systems Systems are started in the following ways:
3. Sequence of starting the system and maintaining the temperature of the air in the duct
The sequence of starting the system and maintaining the air temperature in the manned room depends on the choice of the “winter-summer” mode (the mode is determined automatically by the outside air temperature or the forced mode is set from the operator panel).
In the "winter" mode, the system startup sequence is as follows:
In the "summer" mode, the system startup sequence is as follows:
4. Operation of frequency converters.
Frequency converters are designed to optimize air exchange in serviced premises by controlling the fan speed. The following signals are provided for controlling and monitoring the status of converters:
5. Selection "Working \ Standby" pump on the heating medium
The choice "Working \ Reserve" is set by the time program of the controller of the automation system (for example: a weekly cycle), which ensures a uniform development of the motor resource.
6. Turning on the "Reserve" unit in case of an emergency stop of the "Main"
In the event of an emergency stop of the “Main” unit, the automation system controller generates a command to turn on the “Reserve” unit, with the issuance of appropriate signals to the dispatcher console.
7. Maintenance of set values of supply air temperature
Winter mode
After the system is started, maintaining the set value of the supply air temperature (set from the operator's console or from the dispatcher's console) is carried out by changing the coolant flow through the air heater, according to the laws of PID regulation (proportional-integral).
8. Protection of the air heater against freezing in the "winter" mode
The air heater is protected in three independent ways:
When regulating the air temperature in the duct according to the PID regulation laws, the water temperature in the heat carrier return circuit is monitored in parallel according to the same PID regulation laws. With a sharp decrease in the temperature of the water in the return circuit, the parallel control circuit does not allow the valve on the heat carrier to close abruptly, thereby preventing the risk of freezing in advance. The system does not turn off.
When the water temperature in the heat carrier return circuit drops below +25°C, the valve opens up to 100%. The system does not turn off. With a further decrease in temperature (+18 ° C), the following occurs:
When the air temperature behind the air heater (temperature sensor TS1) drops below +10°C, the following occurs:
To start the system, it is necessary to verify the integrity of the air heater, the control valve and the presence of water in the system. After checking, you need to manually restart the system.
9. Emergency shutdown of the ventilation system
Emergency shutdown of the system is carried out when the following signals are received at the control panel:
Description of the operation of exhaust systems
1. Systems are started in the following ways:
2. The amount of information transmitted to the operator panel and to the control room
The following information is transmitted to monitor the system status:
3. Interlocking of supply and exhaust systems
To maintain the set temperature parameters and the air exchange rate, the exhaust ventilation systems are interlocked with air conditioning systems and supply systems in accordance with the assignment of the “RH” section.
Proper air exchange in the room creates comfortable conditions not only for people, but for all objects and plants in it. It is difficult to achieve this manually, because you will not be able to observe the instrument readings around the clock. Sometimes you will be very hot, then cold, then stuffy and short of breath. Such problems can only be solved automatic control ventilation, which we will talk about in the article.
Main advantages
The use of automatic air exchange controls in the room makes it possible to reduce the cost of cooling and heating it by almost 20%. This is quite an impressive number, so we advise you to pay close attention to our recommendations. The main tasks of such ventilation control systems are to support and control the specified climatic parameters ().
You will also be able to:
- adjust the fan speed;
- ensure protection of the water heater from frost;
- maintain the specified air parameters;
- display or indicate the degree of contamination of the filters.
What is an automatic ventilation system?
Like any technical device, it contains the main elements that help it provide stable operation. Let's consider them in more detail:
| Sensors |
Their price can be significant, so think about their quantity before installing them. |
| Regulators | They are one of the main elements of the automation system, which provide control of actuators depending on the readings of various sensors. |
| Executive mechanisms | They are devices of different types:
|
Now consider the ventilation control controllers:
- Temperature are:
- outdoor - installed on the leeward side of one of the corners of the building, stepping back from the ground 2/3 of its height;
- indoor - installation can be done by hand in a place neutral from cold and heat at a height of 1.5 m from the floor surface;
- duct (to determine the air temperature in the duct) - installed perpendicular to the flow;
- overhead on the pipeline (determine the temperature of its surface).
- Devices for determining humidity are made in room and duct versions. This is a unit with an electronic device that measures relative humidity and then converts the data into an electronic signal.
Such a sensor should be installed in a place where there is a constant air temperature and its speed.
Tip: Do not place it near heaters, vents, open windows, and protect the device from direct sunlight. We do not recommend mounting devices in a dirty or aggressive environment.
- To monitor pressure, analog devices and relays are used, which can measure it both at one point and by the difference in parameters at two points.
The instruction requires choosing a place for installation so that it is not subject to vibrations.
Tip: position the sensor in space in accordance with the technical documentation.
- For monitoring the speed - necessary to measure the speed of the medium in the duct. Then the received signal is converted into an electrical one, after which the required flow rate is calculated in the computing unit, taking into account the channel cross section.
Elements of an automatic ventilation system
As standard, the ventilation control panel provides:
- temperature range regulation;
- air damper control;
- regulation of the supply fan, including speed;
- starting the ventilation unit.
In the manufacture of shields, not only the build quality is taken into account, but also the ease of use of the product. For example, ordinary neon lamps are being replaced by modern LED arrays, which provide a bright and uniform glow, and also do not have a backlight when the lamps are turned off.
The material can be used metal and plastic with protection class IP65. The latter are usually installed in places where there are high design requirements.
The heart of any automation system is the electrical panel, in which the ventilation control system is usually installed. The simplest one consists of a switch with an indicator, making it possible to turn the fan on and off.
However, most often automation controls:
- air valve;
- monitors the cleanliness of the filter;
- when the temperature of the outside air entering the air ducts drops, it turns on the heater.
Therefore, to facilitate its work, it is necessary to install many devices, in particular, thermostats, hygrostats, pressure sensors.
When choosing the type of ventilation in your house or apartment, keep in mind that it can be:
- inlet- works only for the intake of outside air and its transfer through air ducts to the premises;
- exhaust- used only to remove exhaust air from rooms to the outside;
- supply and exhaust- can separately take in outside air and remove exhaust air, as well as work for inflow and outflow at the same time.
Tip: do not rush to run to the store for the elements of a particular system, it is better to carefully calculate everything so as not to pay extra money for unnecessary devices.
Supply and exhaust ventilation system
It is obtained by combining two types of systems - supply and exhaust. Although it is bulky and more difficult to install, it is with its help that you can most effectively establish air exchange in the room. Because of this, this system is very popular.
The ventilation control system makes it easy to bring fresh air into the premises and remove the exhaust air. Literally in a matter of minutes, such equipment completely renews the air even in large industrial premises.
At the same time, the power of the installation must be carefully selected according to the supply and outflow of air masses, so that the same amount enters and exits at a certain point in time. If this is not done, a draft will appear in the room, as well as the effect of “slamming doors”, when doors left open will slam shut with a loud noise.
If run exhaust ventilation, fresh air will begin to flow naturally through the cracks in the doors and windows. At startup supply ventilation excess pressure begins to build up in the room, which forces the exhaust air to leave it through the vents, transoms and windows.
Conclusion
Installation automatic system ventilation in the room may require certain knowledge and skills. Usually this concerns the installation and connection of sensors and the control panel, on which its normal operation depends ().
The video in this article will help you find more information on this topic.
