Industrial buildings, public institutions and residential buildings are equipped with air conditioning and ventilation networks that are complex in design. To organize the operation of a system that combines many technical devices, use the ventilation control panel - SCHUV.
We will tell you how to assemble a shield that allows you to control the ventilation system and set the optimal mode for work or leisure. In the article we presented, the components are listed, the features of their connection are described. Consideration of our recommendations will help to competently automate the start and stop of equipment.
Appointment of the shield ventilation control
If it is necessary to turn on or set up a household split-system or fresh-air ventilation devices fixed in the ventilation duct opening, then no control nodes are required - each device is controlled manually or from a remote control.
But if the length of the networks is large, and the devices are installed in inaccessible places: in mines, on the roof or in the attic, in specially designed niches inside the walls, then there is a need to install a remote control unit.
All information about the operation of heaters, convectors, individual fans comes to a single center - SCHUV. Here are located machines that are responsible for the operation and adjustment of devices
Modern SCHUVs are panels with indicator control devices or metal cabinets that are installed on the floor or suspended from the wall. To protect the internal content, swing doors are provided that can be locked. In addition to the abbreviation SHUV, you can meet SHUV (cabinet).
The main functions of SCHUV:
- control over equipment included in ventilation and air conditioning systems;
- protection of units against the occurrence of overheating, incorrect installation and connection, short circuit;
- adjusting critical equipment parameters, such as performance or power;
- programming the operation of the entire system or individual units for a given time period - day, week, month;
- providing an indication that facilitates monitoring and adjustment;
- maintaining a certain temperature in various rooms, the ability to quickly change its parameters;
- control over the inner walls of the ducts and the degree of pollution of the filters;
- prevention of malfunctioning of seasonally dependent equipment, for example, water heaters, which can freeze at too low a temperature.
The installation of an electrical switchboard at the enterprise or in a residential building allows maintenance personnel to monitor the operation of the equipment from one place and quickly respond to breakdowns and stops of individual devices. Devices that regulate fire extinguishing and partially heating devices can also be placed in the same cabinet.
ShUPVV installation diagram. Cabinets can be shared, combining all the appliances in the building, and serving a separate floor, wing, workshop, section, etc.
In the event of an emergency, for example, a fire in one of the rooms, the ventilation equipment stops automatically or manually - from the control panel.
Features of the device
Installation and configuration of control panels is carried out in accordance with the rules and norms dictated by state documents, such as GOST R 51321.1. Cabinets for pumps and electricians, ventilation panels and air conditioning systems are mounted in corridors, utility rooms or in specially designated rooms - switchboards.
If the building has the capabilities, then all control units, including ventilation and fire, are installed in control rooms.
In the room where the switchboard is located, the room temperature, normal humidity level must be observed. All devices must be protected from direct UV rays and dust, as well as from magnetic oscillations and radio interference.
Manufacturers of electrical equipment offer many configurations that differ in size, function, degree of protection and level of programming. The simplest modifications are designed to serve private residential real estate, complex - enterprises and public buildings.
Requirements for the configuration of control panels
When choosing SHUV they are guided by the sizes of the working area, an opportunity of installation of the necessary devices, ergonomics and safety. The last point concerns both the installers themselves, regularly servicing the network, and people who may be nearby.
The main requirements for ШУВ and ЩУВ are as follows:
- the shield must accommodate all ventilation and air conditioning controls;
- important nodes must be provided with indicators, light, digital or connected to a PC;
- devices responsible for the most significant equipment should have dual control - automatic and manual.
All appliances are neatly placed on the same plane. The package should be as simple and easy to understand. If the ventilation shield is assembled in accordance with all the rules, then, if necessary, even a person who is not knowledgeable in electrics will be able to turn off emergency devices.
Modern control units are made taking into account the possibility of saving electricity. Suppose correctly selected automatic devices can reduce costs by 50-65%
The content and functionality of the shields may vary. For example, for some systems, a frequency converter is necessary, while others do without it. The most convenient for use are cabinets and panels with automation and remote controls.
Work item overview
Structurally, ШУВ is a rectangular plastic or metal case with the required protection class IP 45. If operating conditions are associated with increased risk, the protection class is higher.
Inside the case are placed such devices as a power supply, controller, converters. Several circuit breakers are responsible for individual devices: heaters, recuperators, fans, cooling units, etc.
A mandatory element is a manual control panel. An alarm block is also needed, which is triggered in an emergency and alerts with light or sound signals.
Planks and terminal blocks for installing electrical devices and switching them with wires look the same as analogs for electrical switchboards
Controls also include sensors. This is a kind of receptor that collects various information about the state of the system and its environment.
They take the temperature of the air and the devices themselves, the degree of gas concentration or contamination of the system elements, measure the speed of air movement, etc. The data received are sent to automatic controllers, and the operation of the system elements is adjusted.
By function, the sensors are divided into the following types:
- temperature;
- humidity;
- speed
- pressure, etc.
Temperature can be either digital or analog. A signal of a sharp increase or decrease in indoor temperature can cause the system to switch to another mode.
Humidity sensors operate according to the same principle. How the movement of air masses inside the ventilation ducts can be found thanks to the speed and pressure sensors. At the installation site, the sensors are divided into internal and external. The former take data indoors, the latter, which is also called atmospheric or street, outside the buildings.
Also, ventilation sensors are ducted, that is, installed inside the ducts: either on the walls or across the air stream. They are universal and can transmit a large amount of information: temperature, pressure, air velocity
Some sensors are fixed on the surface of the parts that need to be controlled. They take the parameters of the devices themselves, for example, the temperature of the winding, rotation speed, etc.
Installation of sensors is accompanied by careful selection. On the one hand, the more information, the more accurately the system works, but on the other hand, the operation and maintenance of the network becomes costly in terms of energy consumption.
Controllers work in conjunction with sensors. These are the devices that receive information and process it in automatic mode. They can be called intermediaries, since the signal is then transmitted to actuators: air flow switches, fans, refrigeration units, air heaters.
Controllers with microprocessors are more suitable for installation inside the SHV. They are compact in size and do not require a large area for installation.
Particularly popular are controllers of a universal type, which are simultaneously capable of processing information coming from various systems: ventilation, heating, etc.
Recommendations for the assembly of ШУВ
Installation and testing of the switchgear should be carried out by specialists with the appropriate qualifications; it is not only not recommended, but also forbidden to independently mount and connect the elements inside the switchboard or cabinet.
Cases are not made with their own hands, but purchased ready-made or ordered taking into account the specifics of the ventilation system. A set of devices is supplied with the case: circuit breakers, controllers, power supplies, switches, protection elements and wires.
It is often found that the set of devices and parts is not fully equipped - there are not enough wires or circuit breakers. When selecting spare parts, it is necessary to maintain compliance with technical specifications (for example, the cross-section of wires or the current strength of the machine).
A set of SCHUV elements is accompanied by a scheme for assembly. Any deviations from the circuit may lead to improper operation or damage to equipment
Before ordering, it is necessary to make a list of all devices that are included in the ventilation system, as well as express wishes regarding the switching of operating modes, the type of controller, the presence of certain sensors. In some control rooms, instead of controllers, relays are installed.
An example of SCHUV is a sample with the following technical characteristics:
- nom. frequency - 50 Hz;
- voltage - 380 V;
- voltage of the connected fan - 220 V;
- engine power - 22 kW;
- protection level - IP65;
- dimensions - 400x800x180 mm;
- service life - 10 years.
Ready-made models are marked with symbols that contain information about the modification and its size, degree of protection, type of climate performance, TU or GOST number. In the latter case, manufacturers are guided by GOST 14254 and GOST 15150.
The benefits of professional installation
According to the rules, installation and maintenance of ventilation systems, as well as switchgear should be carried out by specialists with an engineering education. They are fully responsible for the incorrect selection, installation, connection of devices, as well as for the maintenance of technical devices in improper or emergency condition.
In order to correctly determine the filling of the shield or cabinet, the installers make full monitoring of the ventilation network.
Then you need to do the following:
- analyze the load;
- choose the optimal scheme;
- determine the modes of operation of devices in order to increase efficiency;
- pick up equipment.
The assembly itself takes a little time: all devices are alternately mounted in several rows, the wires are carefully connected to the terminal blocks and laid along the lines with organized bundles, then brought out.
One of the connection options, where NK1 and NK2 are channel-type heating devices; M1 - 3-phase fan; A, B, C - network connection, N - neutral, PE - ground; Q - protective thermostat from overheating; Y - ignition protection thermostat
Professional installers have experience in the installation and operation of SCHUV, so they are unlikely to make a mistake with the choice of model and the nuances of connecting devices. In addition, they are well versed in the ventilation schemes of apartments and country houses and can quickly determine the presence of errors in the drawing.
If you fail to figure out and connect the devices in time according to an illiterate scheme — and this also happens — you can create an emergency.
The sale and sale of panels and cabinets is handled by many companies that produce or sell ventilation, refrigeration and heating equipment. For example, in Moscow, this can be done in the companies Ruklimat, Roven, AV-Avtomatika, Galvent, etc.
How the SHUVs look in assembled form, which is part of the “filling”, how the devices are mounted and the wires are connected, can be seen in the videos below.
Phased assembly and installation options:
Video review - a sample assembly of the ШУВ with a heater:
Automation of a ventilation or any other system is a responsible and expensive process. If the equipment is incorrectly selected or assembled, an accident may result in people being hurt, for example, in a chemical plant.
At a minimum, equipment that is also expensive will fail. For these reasons, the installation of SCHUV from the initial design stage to the end should be done exclusively by specialists.
Please write comments in the block below. Share information that may be useful to site visitors. Ask questions, tell about how you installed the ventilation system control panel with your own hands, post a photo on the topic of the article.