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Author Archives: Frank Shan

The big dilemma of HVAC repair or replacement?

A safe, efficient and reliable HVAC system is the key to creating a comfortable environment in any room, be it a residential, industrial or commercial building. Of course, any climate system needs timely maintenance and repair. Therefore, when it begins to show signs of wear, or when its service life comes to an end, perhaps you are asking yourself whether it is worth investing in its repairs or is it better to simply replace it with it? In this article we will try to answer this eternal question.

There is no obvious solution here. Whichever option you choose, it takes a lot of effort to get the HVAC system up and running. To help you make the right choice, we have compiled a list of important factors to consider.

Age of the HVAC system

The service life of the climate system depends on its size, serviced area and purpose of use. Nevertheless, as a rule, it is considered that 15–20 years is the period after which it requires replacement. Naturally, before you decide to upgrade or repair, it is better to conduct a professional assessment of the condition of all components of the system – especially if its annual inspections were not conducted during operation.

Many obsolete components, refrigerants and gases used in climate systems are removed from production in favor of more environmentally friendly counterparts. Consequently, spare parts for outdated systems may be scarce and expensive.

Cost of

One of the factors that any building owner or management company considers is the cost of replacement compared to the cost of repairs. There is one good rule here: if the cost of repairing equipment is more than 50–60% of the cost of a new one, it’s time to change it.

Naturally, budget considerations should also be taken into account, but it should be borne in mind that the new HVAC system will last much longer than the one that was simply repaired.

Energy efficiency

Energy efficiency is a hot topic in the HVAC industry. Manufacturers and suppliers have made tremendous efforts to offer customers more and more efficient systems. Due to its design features and used components, older systems are much less efficient than modern ones.

If you notice a decrease in performance or the absence of any noticeable improvements with a rising cost of operation, this means that, most likely, the system has become ineffective. Low efficiency not only harms the environment, but also lowers the comfort of building conditions, as well as inflates monthly bills.

System performance

The performance of an HVAC system is directly related to its energy efficiency. The main purpose of climate systems is to ensure indoor air quality (IAQ), which is achieved through proper ventilation and air filtration, as well as maintaining temperature conditions.

A low IAQ is associated with a number of ailments that adversely affect the quality of life, productivity, etc. These can be allergic reactions, nausea, asthma attacks, headaches and, in the worst cases, serious chronic diseases.

In this case, the new system must be installed as soon as possible.

Internal factors

Perhaps the building has a team that serves it. In that case, talk to her. This can give you a more complete picture of the state of these systems and will let you know if replacement is the preferred option.

The decision to replace or repair may be dictated by company policy. Sometimes this policy states that repair is a priority option, and this is usually determined by budget considerations. Full replacement of the system may require funds allocated for several years of operation, but when the life of the components comes to an end, the problem should be considered in the long term.

As you can see, the choice between repair and replacement is not an easy decision. Nevertheless, a lot of things speak in favor of installing a new, modern HVAC system. Energy efficiency and low operating costs are likely to compensate for initial costs.

Maintenance and Repair of Ventilation and Air Conditioning Systems

The process of ventilating the room is accompanied by a complete replacement of the air in it (additionally cleaning, drying, heating, cooling, ionization, etc.). The process of ventilation of the premises is implemented using special modern equipment, which is responsible for maintaining the required level of humidity, temperature and cleanliness. In order for the equipment to serve properly and the repair of ventilation systems does not become the main expense item, it is necessary to maintain the systems in a timely manner.

Tracking device operation parameters and quick troubleshooting will prolong equipment life, as well as create comfortable conditions for being in the room.

The variety of types of ventilation and refrigeration equipment, the complexity of their internal assembly leads to the fact that the maintenance of air conditioning and ventilation systems at least once a year is a necessary necessity. With the observance of the rules of operation and timely professional diagnostics, the equipment will serve without complaints for many years.

Why is it important to maintain air exchangers?

Regardless of which room is in question, public or private, clean air and its active movement are crucial factors. In modern construction, modern materials are used that provide minimal heat loss in the cold period of the year or heating of buildings in the warm season through enclosing structures. Thus, more and more buildings are sealed and “do not breathe”, thereby creating the unpleasant sensations of a long stay in a confined space. That is why it is important to maintain the air-exchange equipment in a functional and in good condition, as well as to timely maintain the ventilation system.

The statistics confirms that in case of poor air circulation in the working room, the efficiency of the personnel drops noticeably and the number of sick employees increases. It is impossible to trace this connection directly, since air conditioners and ventilation continue to work for the first time after installation without qualified service – outwardly it will not be obvious that they need professional debugging. But in a contaminated installation, pathogenic bacteria are rapidly developing, and simple diagnostics of ventilation and air-conditioning systems will help specialists quickly identify and select the list of appropriate repair procedures.

Professional assistance and maintenance includes:

  1. checking and replacing filters;
  2. performance check and heat exchanger cleaning;
  3. control of the amount of refrigerant;
  4. cleaning and lubrication of machinery parts;
  5. performance check electronic control.

To ensure proper operation, the initial design and installation of ventilation and air conditioning systems must be carried out by professionals. In the future, qualified assistance may be needed in the following cases:

  1. problems in the operation of automation in the operation;
  2. redevelopment of premises (redistribution of air flow, movement of exhaust umbrellas, balancing the system);
  3. clogging filters, grids;
  4. clogging of heat exchange equipment
  5. imbalance or improper operation of actuators

Types of repair and maintenance work

Depending on the procedures used, the maintenance of industrial ventilation and ventilation of residential buildings can be divided into several groups.

Service, as a rule, is carried out twice a year and includes the following procedures:

  1. check for dents, chips that affect the operation of the device damage;
  2. inspection of the fan, cleaning of dirt and accumulated dust;
  3. impeller balancing check;
  4. measuring and controlling the noise level, identifying the causes of its occurrence;
  5. adjustment of belts and their tension;
  6. flushing heat exchangers;
  7. maintenance of automatic ventilation systems;
  8. inspection and cleaning of the internal surfaces of all sections of the unit;
  9. tightening electrical connections and other maintenance and repair work.

Maintenance for air conditioning equipment is divided into the following types:

  1. clearing the drainage system;
  2. checking the level and pressure of the refrigerant;
  3. carrying out planned work to prevent possible damage, and test the device in all modes;
  4. cleaning of internal filters and heat exchangers;
  5. search for refrigerant leaks and fix them when detected;
  6. setting overheating temperature and checking its differences on the indoor unit;
  7. pulling and maintenance of electrical connections and other procedures.

When the state of technology is not determined, and there are problems, a special expert assessment is needed. If the design, installation and maintenance of ventilation and air conditioning systems were carried out by professionals, then determining the cause of the breakdown and quickly developing a repair plan will not be difficult.

Cost of services

It is not recommended to neglect annual preventive maintenance of air exchange equipment. Even if outwardly it seems that the system is in good condition, without timely maintenance, it will fail much faster than provided by the operating documents.

The cost of maintenance depends on the intensity of use of devices, as well as on the main characteristics:

  1. installation site;
  2. configuration;
  3. past service life.

Three types of HVAC condensers

Condenser is a device used to liquefy gas by cooling it. In the HVAC equipment, the hot gas (vapor coolant) from the compressor enters the condenser coil at the top and condenses, proceeding from the condenser to a receiver located near the bottom. The capacitor coil is located along with the compressor and control devices in the condensing unit. In the air-conditioning system with a remote or split system, the condensing unit is located in the open air. Capacitors are available in various sizes and designs, which include tubes with conventional tubes, ribbed tubular and plate, serial and parallel blocks.

Condensers are classified according to the cooling method. The three main types are broken down into:

  • Condensers with air cooled
  • Condensers of combined air and water cooled
  • Condensers with water cooled

Condensers with air cooled

The air cooled condenser consists of a coil of sufficient surface that air is blown by a fan or caused by natural draft. This type of capacitor is universally used in small refrigeration units.

Air-cooled condensers should be kept free of dirt, nap, and other extraneous materials, as they tend to reduce the air flow around pipes and fins if they are allowed

Combined condensers with air and water cooled

This type of condenser is also known as an evaporative condenser and consists of a coil, cooling water. Sprayed from above, and then cold air enters the bottom and is injected through the coil. When water evaporates from the coil, it creates a cooling effect that condenses the refrigerant inside the coil. The refrigerant gas in the coil is hot, which has changed to a liquid state, combining the scattered water and a large column of moving air supplied by the fan. The water that does not evaporate is recycled using a pump.

Condensers with water cooled

A water-cooled condenser is similar to a condenser on a steam surface. Cooling is carried out only with water circulating through tubes or coils enclosed in a shell. In a water cooled condenser, the refrigerant circulates through the annular space between the pipes or coils. Through its design, a water cooled condenser is also referred to as a two-pipe capacitor.

Since the evaporative condenser is not wasteful to water, large compressor units are available in areas where there is little water. Tests have shown that the amount of required water will not exceed 0.0 gallons per minute per ton of cooling. This is one of the eco-friendly reasons for using a condenser of this type. Evaporative condensers also eliminate the problem of water removal and provide the most economical ways to cool refrigerant gases of standard air conditioners.

Emissions zero, the new challenge in sustainable buildings

The expansion of the urban population is a phenomenon in view of the inevitable increase in the energy consumption that demands more and better comfort and air conditioning solutions.

The growing expansion towards urban areas in search of an improvement in economic growth and quality of life are the factors that led to a total energy consumption of 16 percent. It should be aligned with the criteria of sustainability and care of the planet

Although the scenario presents a challenge of high complexity, there are other variants that may interfere in the taking of solutions. To reach positive levels in these matters, the local administration must create alliances of value with private capital and encourage citizen participation.

Improving efficiency by implementing energy efficiency standards

For buildings to improve efficiency, device and equipment manufacturers must be backed by an effective regulatory framework that addresses the local market. It is therefore the responsibility of the authorities to provide a set of standards that respond to market needs and ensure improvements in energy performance in new and existing buildings as well as components and projects for construction, windows, insulation, ventilation, hot water, HVACR systems, and so on.

Energy labels, certificates or disclosure of energy consumption
after addressing the minimum and maximum energy efficiency in buildings and their components, governments should have to demand the public dissemination of information that improves decision making, such as labels, certificates and public disclosure of energy consumption. Labeling is a useful information tool for homeowners, buyers and renters that supports informed decision-making and promotes a gradual shift in market demand towards more efficient buildings.

Objective for zero net energy consumption
As policies demonstrate the success of energy efficiency standards in buildings, it is important to continue working to seek the best possible performance, taking into account the market volatility and the incorporation of the most recent technologies. Therefore, support for research, development and implementation of buildings with low energy consumption or net zero can be beneficial to advance future building codes and standards.  The constant evolution of technologies focused on efficiency brings with it multiple tangible direct and indirect benefits such as energy saving in the operation and a balanced change in the supply-demand balance of prices, favoring a transition towards carbon-free sources.

Industrial Chiller – Select that meets all of your cooling needs

In an industry where there are machines running full throttle all day, there is a crucial need for chillers. A plethora of reputed brands offers a top class of industrial chillers. These chillers come in several models and variants – water-cooled chiller, portable chiller, and the air-cooled chiller that has different applications and uses.

Industrial chiller is ideal for heat removal. It ensures to make the temperature of the place low and keep it cool for quite some time too. It is eco-friendly and this is why today, machinery is opting for such type of chillers. They help in cooling industrial area, while few others help in removing heat. They are available for use across various industries, plastic, and printing.

However, one has to remember a few points while choosing industrial chiller.

Keep the area in mind: How big is the area that one would need to cool? There are chillers that offer low temperature for the area as per the requirement.

Understanding chiller’s requirements and necessities: The water-cooled requirements would need proper water quality, and the heat recovery is not practical. The air-chilled cooler does not require good quality of water and yet; the heat recovery would need to be practical.

Paying attention to the ambient air: Since it is where the industrial chiller sends the heat air out of the room, it is necessary to keep a check. Heat loads vary with every style of chiller and hence; one must spend some time to read about it before buying.

Controller: It controls and maintains the required temperature of room or industrial area and hence; one cannot ignore its importance.

Fluid for cooling: Will it be tap water or distilled water that would be used for a chiller? Distilled water based industrial chiller might not be the preference of many. So select the chiller of tap water or distilled water-based chiller as per the choice.

Heat requirements: Know the heat load that the area would require. Calculating the heat load is easy by checking the BTU/hr. That is to say, to heat 1lb of water, 1 degree of Fahrenheit is necessary. This BTU/hr conversion is essential to understand the heat load that the chiller shall successfully use.

Compressor: The pumping device helps to pressurize the gas and make the room cool. So, lastly, check its condition and even a condenser to ensure that the industrial chiller runs on for a long time. Moreover, check that it increases the life of machinery in the industry.

Metering device: To ensure that the metering device is working smoothly, it is necessary to learn about it before shopping for the industrial chiller.

Air Heating Systems – Advantages and Disadvantages

Forced air is by far the most popular home heating appliance in North America which provided warmth to the whole building; one room to multiple. Around 90% of homes in North America make use of a central forced air system to circulate warm air in their apartment. Forced air systems consist of a furnace with a fan to heat and move air, supply ducts to carry warm air to each room, return ducts to pull cool air back to the furnace, and a centrally located thermostat for controlling the functioning of the furnace.

A forced-air central heating system is one which uses air as its heat transfer medium. These systems rely on ductwork, vents, and plenums as means of air distribution, separate from the actual heating and air conditioning systems. The return plenum carries the air from several large return grills (vents) to a central air handler for re-heating. The supply plenum directs air from the central unit to the rooms which the system is designed to heat. Regardless of type, all air handlers consist of an air filter, blower, heat exchanger/element/coil, and various controls. Like any other kind of central heating system, thermostats are used to control forced air heating systems.

There are 3 different approaches to the autonomous heating system or forced air central heating system. They are as follows

– Water heating system;
Air heating system;
– Radiant heating system.

In recent year, Air heating system has gain popularity when compared to classical water heating system and radiant heating system

Advantages Of Air Heating System

Cost Effective –

Operational cost and purchase cost of the appliances is much affordable as compared to other automatic heating system

Fast Heating Aptitude –

The high speed of constant air movement inside the heated room provides a quick and uniform heating of the entire volume.

Disadvantage of Air Heating System

Lower Efficiency.

Sure there are 95% efficient forced air systems out there but the number does not tell you the whole truth. By the time the air reaches its destination it has cooled off already and this may be an issue if ducts go through unfinished basements or crawlspaces.

Cold and hot spots.

There will be no room will have the same temperature. Even within the same room, there will be colder spots or warmer spots. In the summer, it can observe that the floors will be colder whereas the ceilings will be warm

Dust is being blown around.

This is a major nuisance. No matter how often you clean and vacuum there is always some dust building up and forced air systems are great in catapulting it into your throat and around the house.

Noise

No matter how well a system is tuned and built, there is always some noise.

Air drafts.

A good A/C system may be relatively quiet compared to one that isn’t engineered properly; however, air drafts are a major problem.

Multi zone Industrial and Commercial Air conditioners

Industrial air conditioners are installed today in all enterprises, factories, manufacturing plants, business centers, shopping halls, sports complexes, large area (over 250 sq. M). Industrial air conditioners provide uninterrupted air conditioning, refrigeration and heating. Features industrial air conditioners – a complexity of use, energy efficiency, the cost of equipment. Industrial air conditioners have a resource 20 – 30 years of operation.

Multi zone system allows to condition several rooms and even the whole building. Each room is set the indoor unit and is supported by individual micro climate. Compared with the installation of individual air conditioners multi-zone air-conditioning system can save money, space, installation time. Multi-zone air conditioning units can be controlled centrally or individually. Designed for buildings containing a few (or a few dozen) areas with different requirements to the air.

Multi zone air conditioning system – profitable, convenient, safe

More than thirty years ago (1982) Daikin Company made a revolutionary breakthrough in the field of HVAC equipment by launching multi-zone air-conditioning system – VRV, which means “Variable refrigerant volume.” Since the company has patented, not only the system itself but also the abbreviation of VRV, as a trademark, other companies began to produce such equipment, began to use the name of the VRF «variable refrigerant flow.” However, in both cases we are talking about one and the same principle of operation of multi-zone air-conditioning.

Features multi-zone systems

  • Multi-zone air-conditioning system – it is the climate system inverter, which is installed in buildings with a large number of premises, providing a separate temperature control in the individual zones.
  • The multi zone system includes one outdoor unit and a lot of internal. The outdoor unit is connected to the internal pipework. Amount of internal blocks, drop their height relative to the outdoor unit, performance, pipe length are defined by the model and brand of the selected multi-zone air conditioning.
  • Multi zonal air conditioning systems use a modular design, so their installation are taken into account wishes of the customer in terms of the number of indoor units and their types (duct, cassette, floor, wall, ceiling).
  • Multi-zone air-conditioning system can be operated to cool the air in the same room at the same time, warming in the other, producing just enough cold and consuming as much energy as necessary to indoor units. Outdoor unit operating mode changes with the load of indoor units.
  • Control each indoor unit is carried out from the local console or centrally from the control center. Temperature parameters given in every room maintained at a constant level with high accuracy.
  • The performance of a number of multi-zone systems can serve the high-rise buildings.

6 questions about underfloor heating

Warm floors are increasingly part of our lives. Someone “felt” warm floors, being at a party, and now dreams of a similar system at home. Someone found them in the bathroom, I liked it, and decided to do around the house. And someone had just heard about underfloor heating, and does not know if he needed it. We will answer your questions.

1.  Is warm floor safe for kids?

Underfloor heating is completely safe for children. It can be easily installed in the children’s room. Moreover, even with an open window in the room there is no draft. You can leave the kids play on the bare floor. However, if you choose an electric radiant floor heating, you should purchase and install is a two-core cable systems. In contrast to the single-core, they are more expensive. But the level of electromagnetic radiation in two-wire electrical floors so small that it has no effect and does not bring any harm.

2. Is it possible to lay floor heating in the bedroom?

It is believed that the warm floor cannot be laid in the bedroom. Supposedly heated air coming from the bottom, a negative impact on healthy sleep. In fact it is not. If exposed to moderate temperature, then sleep will be quite comfortable. Modern thermostats are equipped with timers, daily and weekly programming, so at night the warm floor temperature can be set lower by 2-3 degrees than in the day.  This will not experience discomfort during sleep and still walk on the floor without slippers.

3. Is it true that the underfloor heating system improves the health of asthmatics and allergy sufferers?

Uniform distribution of heat from the floor heating prevents burning of dust, the air drainage. Also underfloor heating to prevent the emergence and spread of mold and mildew. In addition, no radiator dust much less flying across the room, leaving the air clean. If the home is equipped and the system of underfloor heating and ventilation system, there is no doubt, it will be easier to breathe. People with asthma or allergies, begin to feel better.

4. Is it possible to install a warm floor under furniture, under laminate, a parquet floor, under the carpet?

Underfloor heating is spread only on the free space (under the fixed furniture and appliances to mount the floor heating is not recommended). Special electric floor heating for wood can be installed under laminate and parquet board. On the radiant floor heating is also possible to lay laminate or flooring, but it is important that these coatings were of high quality. Carpets and rugs lay undesirable. They impede the free flow of heat across the room.

5.  Can I install the underfloor heating in showers and bathrooms?

And the water, and electric floor heating can be installed in bathrooms and shower rooms. Electrical cables are protected from short circuits. Underfloor heating will forget about the “cold tile”, quickly dry the wet floor, and make it less slippery and dangerous.

6. Can I make a warm floor in the balcony on the balcony? And if so, how – water or electric?

In an apartment building with a central radiant floor heating system cannot be installed, an electric only. In this case, the heating cable or heating mat can be laid on the balcony or loggia. However, it is necessary that the balcony was sufficiently insulated, especially the floor and ceiling. In a private house permissible conduct electric underfloor heating on the balcony or loggia. Water heating in extreme cold can freeze. Therefore, in the cottages should apply anti-icing system.

Ventilation Unit: Advantages and Disadvantages.

What is forced ventilation? How it is done and what is required? In our review – all kinds of equipment for ventilation systems, pros / cons, characteristics. Tell me what to look for when choosing what to buy venting units

Ventilation system in an apartment or in a house:

If exhaust ventilation is usually designed and laid at the stage of building a house, the plenum often left unattended builders. It is assumed that the flow should be carried out through the open windows, leaky structure. But most of the houses are insulated which do not let the air to flow. As a result, there are problems arrive, without forced ventilation which works much worse or does not work at all.
Ventilation devices are capable of ensure the house quiet, clean, comfortable and fresh air.

1: Window flaps.

Mounted on PVC windows. The advantages: cheap, invisible in the interior, installed quickly and easily, does not require drilling holes in the wall.
Disadvantages: window flaps are usually not equipped with filters and sound insulation, are not protected from freezing, moreover manufacturers specify that the window ventilators are functioning only with good extract.

2:Wall intake valves

These devices are mounted on the wall. In fact, they are adjustable window. Equipped with thermal insulation layer, filter against coarse dust and insects. What is important to consider when choosing a valve? For effective ventilation in the apartment or in a house must be a sufficient number of the incoming air.

Disadvantages: of air-supply valves – in extreme cold can pass the cold, and in summer (at the same temperature of air inside and outside) cease to provide the inflow

3: Ventilators

Advantages of ventilators – the ability to perform forced ventilation at any time of the year (as there are fans, forced pounding the air), the presence of the ceramic heater, performing the heating of the cold stream from the street, high performance, the ability to install high-quality filters, providing multi-stage cleaning system from dust, exhaust and other contaminants. What is important to consider when choosing? The volume of incoming air, noise, filter class, power consumption, and size of the device.
Disadvantages: with the installation of the ventilator increases the cost of electricity (especially in cold weather).

4: Supply and exhaust valves recovery

This is not entirely forced ventilation, because the devices have not only the influx, and the hood. They can operate with a ventilation system as well as regular air inlets. Their main advantage – the presence of the built-in heat exchanger, allowing to warm air without energy. Almost invisible in the interior. When choosing-exchanger valve is necessary to take into account the capacity of the device, air flow, noise level, country of origin, the period of warranty, the build quality.

Disadvantages: the heat exchanger valves – not as effective as in ventilation installations, reheating is not provided, so the frost can pass cold air.

5: Fresh air ventilation systems.

This is ideal ventilation for the house, apartment or office. The interior ventilation is invisible (hidden under the ceiling ducts). At the same time the performance of the device will be enough to ensure effective ventilation throughout the house, apartment or office

Disadvantages: complexity of installation work – need to lay ducts, installation of the system is possible only before the final finish of the room. You cannot save on electricity

Basic Modern Air Conditioner Functions

Air conditioners can be found in all price categories with a similar set of features and modes.

Infrared remote control with LCD display used to manage all the modern air-conditioner that allows you to set the mode of operation of a split system, the desired temperature, programming the timer to turn on / off the air conditioner, etc.

As a rule, the number of functions of an economy class air conditioners do not differ much from the models top price category. Reason such harmonization is that to provide added functionality is not required to modify or complicate the design of the air conditioner, only need to reprogram the microcontroller controlling the operation of the air conditioner and add the buttons on the remote control.

Because of this producers can inexpensively add new modes conditioners or additional functions and successfully build on their basis of their advertising campaigns. As a result, in terms of affordability, the difference between the air-conditioned different price groups are often absent.

Less common features that really lead to a rise in price of air conditioning, as their implementation requires changes in its structure. For example, the built-in motion sensor saves energy and temperature sensor in the control panel allows you to maintain the set temperature of the indoor unit is not in the area, and where is the remote. How these functions are needed and whether or not for them to pay for the air conditioning to you.

Major modes and air-conditioning functions:

Cooling and heating 

The main modes of the air conditioner used for air conditioning and heating.

Ventilation

The operating mode in which only works indoor fan, without including the compressor. Used for even air distribution throughout the room and can be used, for example, in winter, when warm air from heaters or central heating batteries accumulates on the ceiling and the floor is cold.

Automatic mode

In this mode, the air conditioner itself controls the selection of the operating mode (cooling, heating or ventilation) to maintain a comfortable temperature.

Dehumidification

The dehumidification air conditioner reduces the humidity. Generally speaking, dehumidification is always accompanied by its cooling. The warm air comes into contact with a cold heat exchanger (radiator) of the indoor unit, resulting in a heat exchanger to condense moisture, which is discharged through the drain hose. The same principle works all modern air driers. Therefore, in the dehumidification mode, the air conditioner operates in the same manner as in the cooling mode, only the room temperature is reduced by no more than 1 ° C.

Air purification.

To clear the air before the heat exchanger of the indoor unit set one or more filters. The primary air conditioner filter for cleaning the air from large dust. This filter is a conventional fine mesh and protects not only the inhabitants of the conditioned space as the interior of the air conditioner. To clean this filter enough wash it with warm water.

Setting the temperature.

For heating and cooling modes can be controlled by the air temperature to within 1 ° C in the range of 16-18 to 30 ° C. Typically, the temperature sensor is installed in the indoor unit, but some models have an additional sensor, built-in remote control (function «I Feel»). In some models also have built-in indoor unit remote infrared thermometer that measures the temperature of the surrounding surfaces (function «I See»).

Fan speed

The indoor unit fan can rotate at different speeds, respectively, changing the amount of air passing through the internal unit (this option is called the air output or “pumping”the air conditioner is measured in m³ / h). Typically, the fan is from 3 to 5 fixed speeds plus auto mode.

The direction of air flow

The direction of air flow generated by the indoor unit can be adjusted vertically by means of horizontal plates (louver) having fixed positions 5-7. In cooling mode, the flow is usually directed horizontally along the ceiling to the cold air did not get to the people. In heating mode, the air flow is directed downwards, because hot air is lighter than cold air and rises upwards. In addition, the blinds can automatically swing up and down, evenly distributing the flow of air around the room.

The timer on and off

With the 24-hour timer, you can set the auto power on and off the air conditioner, for example, can include air-conditioning for an hour before returning to work.

Night mode

After the inclusion of the air-conditioning mode, sets the minimum speed of the fan (to minimize noise) and gradually increases (in cooling mode) or decreases (in heating mode) at a temperature of 2-3 degrees for several hours. It is believed that such temperature conditions are optimal for sleeping.