According to building codes, any building must have ventilation system designed capable of supplying fresh air to the premises. On average, each person should have between 30 and 60 cubic meters of fresh air per hour.

able to solve this problem forced ventilation, one of the simplest building ventilation systems. Despite its cost-effectiveness and uncomplicated principle of operation, the air handling unit has become a worthy alternative to expensive and technically complex climate control systems. The principle of its operation is simple: air handling unit Clean air enters the premises and displaces dirty air.

Relatively low installation cost and ease of operation are not the only advantages of the air handling unit. There are others:

• firstly, relatively small installation size - this simplifies the process of installation and maintenance of equipment and reduces the cost of these works.
• Secondly, the supply, in addition to supplying fresh air to the premises, performs additional useful functions: cleaning, air cooling/heating and humidity control.

Regular maintenance of climate systems contributes to

Savings
Owning a ventilation system at all costs can be much less costly if regularly technical inspection existing air conditioning equipment. With regular maintenance of air handling units, the risk of emergency situations during operation is reduced. For the normal functioning of the air handling unit, it is enough to carry out a comprehensive technical inspection only three or four times a year. If we compare the cost of a visit by a specialist servicing climate equipment with the cost of repairing the system, then the benefit from regular Maintenance air handling unit become apparent. Lack of regular maintenance significantly reduces system life supply ventilation . The replacement of a faulty climate system is inevitable, and the purchase of a new installation and the dismantling of the old one will cost their user a considerable amount.

Increasing the capacity of the installation
It is no secret that over time, the power of the installation decreases, and there are failures in the output or air supply. It is this reason that explains the lack of fresh air and the accumulation carbon dioxide in the premises. The consequence of this is the appearance of frequent ailments among office workers. With timely and high-quality cleaning of the internal parts of the ventilation system, which is included in the regular maintenance of climate equipment, the quality of the air handling unit will be at its best.

Improving the safety of the air conditioning system
Everyone knows that there is no better place for the rapid life of bacteria than the air filters of ventilation equipment, which are cleaned and disinfected irregularly. If a contaminated device continues to function, it causes the rapid spread of millions of viruses and bacteria throughout the premises. This explains the infection of all office workers during cold or flu epidemics.

Keeping clean and fresh
Irregular conduct of comprehensive technical inspections of the equipment of the supply systems can cause the accumulation of debris, dirt and grease deposits inside the ventilation equipment, therefore, unpleasant odors may appear during the operation of the units. The appearance of an unpleasant odor during the operation of the device is prevented by regular cleaning of the unit body and its heat exchanger. A well-groomed, clean modern supply unit will always be a stylish addition to the interior of the room.

Compliance with fire safety rules and regulations
In autumn and summer, leaves and poplar fluff can get into the case of outdoor units of ventilation equipment. They may cause a fire. Owners of equipment that regularly undergoes comprehensive technical inspections do not have to worry about the risk of a fire hazard, since such inspections include work for cleaning the outer casings of climate systems.

The list of works carried out during the maintenance of air handling units:

• Inspection of the external structure of the installation, including testing the reliability of fasteners and fences.
• Equipment bearing lubrication.
• quality cleaning the air filters of the supply unit.
• Inspection of electric actuators of fittings (shut-off, control).
• Controlling, fixing instrumentation readings, including the state of automation.
• Checking the power supply by phases.
• Checking the functionality of the water pump.
• Checking the functionality of the drain.
• Inspection drive belts installation.
• Inspection of the condition of the heat exchanger.
• Testing power, control circuits with threaded connections (if necessary).
• Control and adjustment of the three-way valve in the water air heater.
• Testing and adjustment of a three-way valve in a water air cooler.
• Inspection of the alignment of the fan pulleys, the drive pulley of the ventilation equipment, with subsequent adjustment if necessary.
• Perform alignment and cleaning of the impeller.
• Checking the position of the belt guard housing in the installation.
• Tightening the damping springs in the fan motor.
• Testing fasteners for flexibility and strength.
• Drainage cleaning by means of chemical compositions.
• Testing the condition of steel mesh water filters and cleaning the filters if necessary.
• Cleaning of blinds.
• Checking the tightness of air ducts of ventilation devices.
• Cleaning the device heat exchanger through chemicals.
• Cleaning the interior of the unit.
• Air duct seal.
• Control of bearings of electric motors of fans.
• Brief instruction for users on operation ventilation units.

The frequency of complex technical inspections of the device depends on the type of room in which the air handling unit is used. According to building codes and regulations, maintenance work on ventilation equipment is carried out within the following periods:

• Supply units of grocery stores, restaurants, car services, server, flower shops must undergo a comprehensive technical inspection of ventilation equipment monthly.
• For ventilation systems administrative buildings, business centers, non-grocery stores, offices and multi-apartment buildings, maintenance work should be carried out quarterly.

One-time maintenance cost

Type of equipment	up to 1500 m 3 / h	up to 5000 m 3 / h	up to 10000 m 3 / h	up to 20000 m 3 / h	up to 40000 m 3 / h	from 40000 m 3 / h
Air handling units

Every HVAC system requires periodic maintenance.

A modern ventilation system consists of many nodes and components of varying degrees of complexity. The ventilation system usually includes exhaust fans, air handling units with heating, often with cooling of supply air, pumps, heat recuperators. To cool the air supplied to the room in ventilation systems, water cooling units (chillers) or compressor-condensing units are used. All this is controlled by an automation system consisting of sensors, actuators, one or more controllers.

The equipment of the ventilation and air conditioning system, as well as any other complex equipment, wears out, becomes dirty during operation, some parts require replacement, some additional adjustments, etc.

Failure or incorrect operation of one part can lead to incorrect operation of the entire system, and instead of freshness and comfort, you will, at best, have an incorrectly working system with excessive energy consumption. And in the worst case, this can lead to further serious damage to expensive equipment, and a complete stop of the microclimate system.

For trouble-free operation, periodic maintenance of the ventilation and air conditioning system is required.

Without maintenance, any even the most modern system ventilation will not work longer than the warranty period.

Fan

In any even the simplest forced ventilation system, there must be exhaust fans. It would seem that you can serve in the fan? But it seems so only at first glance.

The main task of an effective ventilation system is to provide air access and exhaust, temperature control, and air filtration. For the full implementation of these tasks, the installation of special equipment is required, as well as the distribution of air ducts, which means periodic inspection and adjustment. But even when indoors the foundation is natural system, periodic cleaning of air ducts is necessary, which means that ventilation maintenance should be carried out in all types of premises: civil or industrial.

Signs and causes of a decrease in the efficiency of the ventilation system

Condensation often forms on the walls or a mirror in the bathroom, and air stagnation is felt in the living quarters (living room, bedroom), and odors in the kitchen are not removed after cooking, but spread throughout the home.

All these factors indicate that the ventilation system does not cope with its task of providing fresh air, as well as its effective exhaust.

You can check the draft force in the air duct by bringing a strip of paper to the ventilation grille. The quality of the system is determined by the intensity of the fluctuations: the larger they are, the better the air exchange.

Maintenance of ventilation allows you to prevent most of the possible negative consequences, including: blockage in one or more sections of the ventilation duct, depressurization of the air duct, equipment failure, reduced efficiency due to clogged filters or other equipment components. But it is impossible to completely exclude the possibility of a sudden breakdown, since due to the combination various conditions there is always a risk of a malfunction. But this probability can be reduced if the frequency of ventilation maintenance is observed.

As a rule, the frequency of such work is 1-2 times a year (the required minimum is 1 time per quarter). But it is recommended to perform inspection and prevention twice as often, that is, once every two to three months.

A number of tasks that preventive examination solves

Independent control of the system operation is acceptable if the ventilation is not equipped with high-tech equipment and a complex network of ventilation ducts. Maintenance of ventilation of residential buildings will not cause difficulties if access to the main components of the system was provided at the design stage. In the presence of less functional equipment (supply valves with a filter, exhaust fan), you can clean it yourself.

Maintenance of ventilation systems of large industrial facilities, civil premises (restaurants, cafes) and monoblock installations in residential buildings involves a number of tasks, including:

• Periodic inspection of all components of the system, including mounting equipment.
• Checking the tightness of the filter gaskets, which will prevent the penetration of external polluted media into the room, bypassing the filtration system.
• Inspection of fan rotor blades, injectors.
• Ventilation maintenance involves replacing or cleaning the filter mats. Here the amount of work depends on the type of filter. It may also require a complete replacement of the filter system.
• The effectiveness of air purification is checked.
• All valves and ventilation shutters present in the system are checked for operability.
• Maintenance of ventilation systems necessarily includes inspection of air ducts and checking the fastenings of all suspended ventilation ducts.
• Sensors for regulating air parameters must also be checked for functionality and compliance with actual values ​​of temperature and air humidity.
• The system is tested for leaks. In addition to inspection inner surface ventilation ducts, an external inspection is carried out, including an assessment of the condition of the welds along the entire length of the ventilation shafts.
• Maintenance of the supply and exhaust system should include testing of all automation, as well as electrical circuits. The voltage can be measured at the main nodes of the system.
• Checking whether the heating or cooling of the air environment corresponds to the values ​​that the equipment fixes.

Evaluation of the operation of the ventilation system combined with air conditioning

The front of the work that needs to be done, each organization for the repair and maintenance of ventilation determines independently. Therefore, before concluding a contract for the inspection and adjustment of the system, it is recommended that you familiarize yourself with the services offered by a particular company.

Maintenance of ventilation and air conditioning means an increase in tasks, since in addition to evaluating the operation of ventilation equipment, it is necessary to check the operation of air conditioners.

A lot depends on what type of system is chosen. If a combined version is installed (the ducted air conditioner is mounted in the ventilation shaft), then the amount of work will be somewhat less than in the case when an autonomous split system is installed, since maintenance is performed separately exhaust ventilation and air conditioning channels. Accordingly, the cost may be higher, the price directly depends on the volume, duration and complexity of the work performed.

Maintenance of air conditioning and ventilation systems involves not only cleaning and adjustment, but also the disinfection of individual components. This is necessary as a result of the fact that the air conditioner creates favorable conditions for the appearance of mold and mildew. So, condensate regularly falls on the evaporator. It is because of this, as well as dirt deposited on a wet surface, that mold can appear in the mechanism. Maintenance and repair of ventilation systems is aimed at eliminating any problems, as well as cleaning and disinfecting devices.

The modern ventilation system is a complex complex various devices and aggregates, therefore requires regular professional maintenance. During operation, the equipment experiences significant loads, which can cause breakdowns, failures, and a decrease in work efficiency. Maintenance of ventilation and air conditioning is aimed at maintaining the system in working order, preventing and, if necessary, correcting problems.

Types of jobs

If your building (apartment, shop, office) has a ventilation system, then the best way to maintain it is to conclude an agreement with a specialized company. This type of cooperation is more profitable and more convenient than inviting a master for every next breakdown.

Maintenance services for ventilation systems include preventive inspections and work, thanks to which the equipment operates properly, without requiring major repairs. Since the reliable operation of ventilation is directly related to the well-being and health of people, the importance of service is obvious.

Service list

In the event of design errors, as well as in the absence of Maintenance ventilation systems quickly fail, their performance decreases.

Troubleshooting

During the diagnostic process, the wizard checks the serviceability and integrity of all important elements systems. For diagnostic work, special tools and measuring instruments are used. The specialist evaluates:

• condition of air ducts, shafts and chambers;
• connection density and integrity of parts;
• the level of contamination of filters;
• condition of fans, heat exchangers, coolant.

To assess the performance of the system as a whole, the temperature and air pressure are measured.

Hardware setup

For effective work ventilation system it is necessary that all equipment work smoothly. Equipment setup includes the following operations:

• lubrication and adjustment of the fan motor, bearings;
• cleaning filters, air intake and air distribution grilles;
• adjustment of automation;
• elimination of defects in the fastening of system elements, loose connections.

Service and warranty service

After installation and start-up of the ventilation system, the equipment is covered by a warranty. During the warranty period, ventilation warranty service. This service is provided within the framework of the standard regulations. At the end of the warranty, service maintenance of the system is provided. This service provides for work on equipment diagnostics, current repairs, if necessary, overhaul. An important part of HVAC maintenance is the disinfection of grates, hatches and fans.

Repair

If the diagnostics show that there are breakdowns, violations in the system, then current or major repairs are required.

Current repairs are carried out on site, without dismantling the structures. Dismantling, inspection, elimination of minor defects, replacement of used parts, assembly of equipment are carried out.

Overhaul is carried out in case of major breakdowns and involves the dismantling of individual elements or the entire system. The dismantled units are repaired in the workshop or at the manufacturing plant, then the equipment is reassembled into place.

Stages of work

Maintenance of ventilation systems consists of the following steps:

1. inspection, diagnostics of the system, check of fasteners;
2. cleaning of air ducts, filters, gratings, fans;
3. system disinfection;
4. examination technical condition fans, heat exchangers and other parts of the system;
5. air temperature and pressure control;
6. automation check and other works.

Based on the results of scheduled maintenance, a decision is made on the need to repair the system.

The cost of maintenance and repair of ventilation depends on a number of factors - the features of the system, its performance, the availability of additional equipment and automation. On the website of our company there is a table by which you can find out how much it will cost to repair and maintain ventilation systems in your building.

“With design errors made, as well as in the absence of maintenance, ventilation systems quickly fail”

The leader of the direction speaks.

The supply ventilation system is an indispensable solution in urban apartments and offices, where it is impossible to get a healthy microclimate simply by opening a window.

Air supply devices pump a portion of air from the outside, simultaneously cleaning it and heating / cooling, depending on the time of year.

The system should work without failures, because the health and activity of people in the room depends on it. Many companies professionally perform maintenance of fresh air ventilation. Consider what works are included in the list of services of such companies, and how much maintenance of supply and exhaust ventilation will cost.

Even if the system is working properly, a mandatory scheduled inspection must be carried out at least once a year.

If the ventilation unit has a solid work history, or works in conditions of high wear and tear (especially in a swimming pool, catering or workshop), checks and maintenance should be carried out more often - once every 1-6 months.

This is a considerable amount of work that requires professional knowledge, equipment and takes a lot of time, so it is better to entrust the service to a team of specialists.

An extraordinary check should be arranged if there are signs of a decrease in efficiency: extraneous noise, condensate and heavy air, odors, dustiness.

Bring a strip of paper to the ventilation grate, if there is good draft, it should sway intensely; if not, it's time to call the service.

Checks on de-energized equipment

In short, specialists must check the integrity and tightness of the air ducts, the serviceability of the electrical part and grounding, clean the filters and channels, make sure that the fasteners are secure and the settings are correct.

Detailed work is signed for each organization individually, so before concluding an agreement, check out the list of services that are provided.

The initial check might look like this:

1. visual inspection. It is carried out in order to identify external malfunctions, depressurization and leaks (heat exchangers, seals, fasteners, etc.). Flanges, connections are tightened; wear of bearings, pulleys is checked.
2. Electrician. Checked and stretched electrical circuits, connectors, contacts, starters.
3. Resistance. The electrical resistance on the elements (fan motor, damper and control valve drives, heating elements, pumps, motor windings) is monitored.
4. Freon. Inspection for leakage is done.
5. Fan blades. The free wheeling, the direction of rotation is checked.
6. Inspection of the drainage system.
7. Air filters cleaned or changed.
8. Heat exchanger. The fins of heat exchangers are cleaned from dust and dirt.
9. Grease. The presence of lubrication in all moving structural elements is checked.
10. Lattices. Inspection and, if necessary, cleaning.

Find out if the list of works includes not only cleaning of air ducts, but also disinfection of channels and installation elements. Ventilation with air conditioning is favorable conditions for mold and fungi.

Power-on checks

1. Noise. An assessment of the sound level and extraneous noise during operation is made.
2. Fan. The movement of the impeller in working condition, the degree of heating of the housing, the tension of the belts are evaluated.
3. Electrician. The power supply is checked by phases: deviation from the norm in current and voltage.
4. Protective elements. The function of the emergency stop is checked.
5. Compressor. Measured power, operating parameters; operating current and starting.
6. Measurements of the volume of processed air. It also checks the compliance of the degree of heating and cooling of the air in fact, with the indicator that was originally declared by the manufacturer. The humidity is measured in all areas - from the inlet valve to the outlet grate.
7. Automation check.
8. Assessment of the operation of the ventilation system as a whole and carrying out repairs, if necessary.

Diagnostics of operating ventilation

At the end of the check, the center's employees fill out technical documentation on the work performed and the state of the system.

If, during the inspection, it turns out that a repair or replacement of any element is required, employees of the same service center can fix the problem, but for a fee. Minor repairs not related to the replacement of components should be included in the terms of the service contract.

There is a lot of controversy about devices for purifying and humidifying the air - someone thinks that they are useless, someone - on the contrary, and some say that they are simply useless and this is a waste of money. Let's try to figure it out.

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Ventilation maintenance cost

Any company has a price list for scheduled examinations, but still the cost of services may vary depending on:

1. The complexity of the system.
2. Degrees of deterioration.
3. How difficult it was to get to the ventilation units.
4. The number of installed heaters and control units.
5. The amount of work that had to be done.

Some companies set separate tariffs, according to what type of air conditioning is used. Namely, electric or water heating of air; water, glycol or freon are involved in the cooling system. Maintenance of the latter usually costs the most.

The main criterion, which is reflected in the price lists, is the power and performance of the systems. One full inspection of the supply ventilation will cost:

• Less than 5 thousand m 3 / h = 3.5-9.6 thousand rubles.
• 5-10 thousand m 3 / h \u003d 4.2-14.6 thousand rubles.
• 10–20 thousand m 3 / h \u003d 5.1-18.3 thousand rubles.
• 20–30 thousand m 3 / h \u003d 7.5 -20.5 thousand rubles.
• 30-40 thousand m 3 / h \u003d 10-24 thousand rubles.
• 40-50 thousand m 3 / h \u003d 12-27.4 thousand rubles.

Most companies offer good discounts on regular maintenance. service if a long-term contract is concluded with them.

Conclusion

If you neglect the planned maintenance of ventilation systems, this will lead to the accumulation of dust, grease and other dirt in the channels, a decrease in air velocity, an increase in energy consumption and, in the end, the loss of expensive equipment.

In addition, it may take some time before the failed part is purchased, replaced and the system will work again.

And if in a small office or cottage it will be temporarily possible to be content with opening windows, then in the production of simple ventilation it can threaten with losses.