The device of chiller-fan coil units is often an integral part of the central air conditioning system of office buildings, shopping centers, public areas great cross-country ability, other large objects. Installation of fan coil units allows you to provide cooling / heating of air in a large space. Design, installation of chillers and fan coil units, estimated estimates are carried out by specialists, depending on the modification of the device, the features of operation.

Chillers and fan coil units for central air conditioning systems

Chiller-fan coil is a type of air conditioning devices, distinctive feature which is the circulation between the blocks of water (ethylene glycol / propylene glycol) as a refrigerant.

Chiller- a refrigeration machine that lowers the temperature of the liquid inside the coolant. Installed on the roof, attic space, technical room. When installing the machine on a roof, it is necessary to drain the water from the system before the onset of the cold season.

Fan coil unit- the internal block of the device, equipped with a fan (fan), a heat exchanger (coil). Outwardly, it is very similar to a split-system block.

The equipment can operate in three modes: cooling, heating, cooling-heating (4-pipe piping).

Indoor unit modifications:

• wall
• cassette
• duct
• floor and ceiling.

Let's briefly present the installation diagrams.

Installation

Installation methods:

• hidden - installation of frameless blocks. Placed above the false ceiling, in the inter-wall space, in utility rooms.
• standard - installation of equipment with a track length of no more than 5 m.
• non-standard - the length of the tracks is more than 5 m, high-rise installation with a call to the industrial mountaineering service.

Wall fan coil installation

Wall-mounted options look like regular externally household air conditioner... Wall-mounted, installation is simple, inexpensive. Best suited for rooms with low ceilings, inability to design suspended ceiling... The most optimal option for small office space.

Device and installation:

• determine the installation location;
• mark the mountings for the mounting panel;
• fix the block with anchor bolts;
• align the position strictly horizontally in all directions;
• distribution of pipelines;
• connection drainage system;
• placement of a drainage pipeline;
• electrical connection
• filling the system with water / ethylene glycol, trial run, testing.

Installation of a cassette fan coil unit

A kind of ceiling device, it is placed inside the ceiling space between the "armstrong" slabs. Standard sizes: 600x600 mm, 900x600 mm, 1200x600 mm. Only the front side of the intake grille is visible.

Installation methods:

• hidden installation inside a suspended structure. The standard option, often used for office premises, business centers;
• open placement on the ceiling with anchor bolts. Applicable: large hypermarkets, shopping centers.

Layout scheme:

• choose an installation location;
• mark the ceiling mounts;
• secure with anchor bolts;
• connect to the chiller, central heating system (if heating is planned, 4-pipe piping);
• laying the pipeline route, thermal insulation to protect against condensation;
• equipment of the drainage system with a pump;
• collection of a mixing unit, 2 or 3-way valve;
• tightness test;
• commissioning works.

Installation of a duct fan coil

A distinctive feature is the placement of equipment under the ceiling, additional organization of air ducts for supplying cooled / heated air through air intake grilles, diffusers. Typical for office, industrial, trading areas, country houses.

Connection to ventilation system... Purified cool air will be supplied with a mixture of fresh outdoor air.

Open accommodation is typical for large shopping centers. But most often, a closed installation of horizontal or vertical design is used.

With horizontal installation, all communications remain under the ceiling, closed by a suspended ceiling structure. When the height of the room does not allow, vertical execution is possible - communications are arranged inside the wall ceilings (using fan coil units of the vertical type).

Organization chart:

• mark the installation location under the ceiling / inside the wall covering;
• dilute the system of air ducts, grilles, diffusers;
• protect the pipeline from condensate with thermal insulation;
• equipping with a drainage pump, installation of a condensate drainage system;
• collection of the mixing unit;
• starting fluid, checking for leaks.

Fan coil installation with piping

In addition to cooling, this air conditioning system is used for heating. The indoor unit is connected to the chiller and central heating system. For this, a second heat exchange circuit is used.

Depending on this, two types of strapping are distinguished:

1. Two-pipe. Operation only for heating (the chiller is equipped with a heat pump) or cooling. The piping is organized by a two-pipe circuit with one heat exchanger. In this case, the device is equipped with a 2-way valve that works to open / close the fluid supply inside the heat exchanger.
2. Four-pipe. Connecting a device for cooling / heating at the same time. One circuit is for connection to refrigeration machine... The second two-pipe circuit is for connection to central heating. Thus, the device simultaneously cools and heats the premises. Relevant for buildings where a separate setting of the temperature regime in different rooms is required.

It uses a 3-way valve that bypasses fluid indoor unit when heating is connected, which allows you to maintain the autonomy of the circuits with their own temperature characteristics.

The use of this device as part of central air conditioning equipment allows you to bring the quality of the cooled air to the required microclimatic indicators. The ability to connect to central heating during the cold season significantly saves energy costs. Especially important for large office buildings, business centers, large shopping areas. Installation for suburban housing is also possible.

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Room air conditioning
Air conditioning system project. Key aspects

A fan coil unit is capable of heating or cooling the air in the room. The system allows you to set a certain temperature regime and make the stay of people in the building more comfortable. Structurally, heat exchangers differ from each other, but they all have the following components:

1. Intake air filtration device.
2. The main part of the fan coil unit. It is in it that the process of heating or cooling the air that comes in from the street takes place. The outlet air temperature depends on the selected operating mode.
3. Rotary fan. This part forces air through the main body of the heat exchanger.
4. A heating element that is powered by electricity.
5. Air conditioning control unit and control panel.

Fan coil - room heat exchange system

Principle of operation

The air flow enters the intake part, and from there into a special installation called a chiller, and is driven by a fan. Then it passes through the main chamber of the heat exchanger. There the air is heated or cooled, depending on the set parameters.

Installation features

Fan coil installation is a very complicated process and requires both certain knowledge and experience. It is better to entrust the installation of equipment to professionals. The entire system installation process can be broken down into the following steps:

1. Installation of fan coil units. You need to choose the most efficient place.
2. Installation of the necessary taps, thermal control equipment, special valves, etc.
3. Create a strapping node.
4. Connecting the equipment to the power supply network.
5. The process of checking the tightness of the adhesion of the seams.
6. Filling the heat exchanger with water.

Classic connection diagram

Fan coil installation is carried out in groups using single equipment or equipment of various designs. The device connection diagram directly depends on design features systems.

The fan coil connection schematically looks like this:

From the chilled liquid (water) there is a line to fan coil units, connected in parallel to each other (there can be one or several pieces). They have two tubes. One for the inlet of cold water, and the other for its outlet. Further, after the circulation, the water is discharged through the second line to the starting point, where it is re-cooled.

Mounting the enclosure

Fan coil units are installed according to the same scheme for most models:

1. The console equipment is fixed to the floor using specially installed racks. The enclosure is mounted with flat head screws to the wall.
2. Installation of the unit on a wall by vertical mounting is carried out with the drilling of the holes provided in the instructions for the equipment.
3. Installation of the system on the ceiling is carried out by fixing the body to the ceiling using anchors and brackets. Most often, the system is covered by an installed suspended ceiling.

Assembling the strapping unit

During the strapping process, a variety of methods are used, both manual and automatic fittings, filters, control sensors, drain taps.

When connecting the system, you must use pipes with a diameter that matches the diameter of the unions used.

It is important to connect all joints tightly. This will prevent breakdowns and interruptions in the operation of the system.

Use gentle curves in the water supply and drainage system. Sharp turns will interfere with the operation of the equipment. In many cases, the system is installed using two-pipe scheme strapping.

Fan coil unit

Thermal insulation of the pipeline

If you do not use thermal insulation of the pipes of the water circuit, then the system will work poorly due to the loss of heat by the transported water. As a result of the contact between the pipeline and the air, condensation will form on the walls, which will soon lead to an increase in the level of humidity in the room and the formation of mold on the walls. To avoid these problems, the surface of the pipeline must be insulated with a special material.

The insulation should be 2 cm thick if the temperature in the building is +30 ° C and the average humidity is 75–80%. If you do not adhere to this rule, then condensation will appear on the surface of the thermal insulation.

In order to drain the condensate that has appeared as a result of work, use the installed channels. When laying the drainage system, a slope angle of 2 mm per 100 mm path must be observed. When laying the line, you need to make sure that there are no areas where drainage water can stagnate.

Condensation, which forms on the pipe walls, enters a special tank installed under the fan coil unit. Further, passing through the branch pipe located in the side of the unit, it is taken out. Installation of drainage and condensate drainage pipes is carried out by connecting all joints using special ties. This is necessary to create the tightness of the system and prevent leaks.

Fan coil device

Network connection

Before connecting the unit to the power supply, you need to remember about the dangers of these manipulations and adhere to certain rules:

1. Be sure to ground the equipment before connecting it to electricity!
2. When powering the unit, you must use the type and size of the electrical cable that was specified by the manufacturer in the instructions.
3. It is worth considering the fact that a fan coil is equipment that consumes up to 15 kW of electricity. The equipment is connected to the mains through the panel using all three cables (you can use a socket rated for a power of 230 V and a frequency of 50 Hz).
4. It is forbidden to install a shield with terminals next to the water cooler.
5. The wires supplying voltage must not come into contact with the equipment control network and parts of the water supply system.

System testing

Before starting the operation of the fan coil system, a number of test activities must be carried out. This is necessary in order to check the operability of all elements of the equipment.

Crimping

First you need to rinse all parts of the water supply pipeline with water. Further, the entire system is filled with water and the tightness of all joints of the system is checked. The next step is to create the appropriate pressure using a hydraulic pump. The system is under increased pressure for 5 minutes. This will help locate leaks that were not detected during the initial visual inspection.

The success of the tests at this stage is evidenced by the fact that the system did not leak, and the created pressure did not decrease.

Water start

After filling the water circuit with liquid, it is possible that air will remain in the system. Its removal is carried out during the operation of the equipment and takes a couple of hours. These actions are performed using a manual air bleed valve.

It is also mandatory to check the drainage of the fan coil unit. For this, a small amount of water is added to the condensate collection tank. The liquid should gradually drain out through the drain tube. If this does not happen, you need to check the slope angle of the drain.

Nutrition

Connection to the power grid is possible only when all sections of the equipment wiring are checked. What you need to pay attention to:

1. Rotor. The uniform air distribution and the direction of rotation of the fan are checked.
2. Automatic control mechanisms.
3. Electric heater.

After a final check of all mechanisms, an appropriate document is drawn up, and the fan coil units can be operated.

The condensate drain pump must be checked before connecting the device to the mains.

Conclusion

Installation of a fan coil unit requires special knowledge, training and experience. The quality and durability of the entire system directly depends on the competent installation of fan coil units. When contacting a company for the installation and maintenance of such climatic equipment, you should pay attention to the experience of specialists and the availability of the necessary equipment in the company.

Only in this case is it guaranteed correct work all mechanisms of this equipment.

Today, in homes, instead of air conditioning systems, they often resort to installing fan coil units - devices that cool and heat the air in the room. The heat exchanger can be installed in different rooms buildings and set an individual temperature regime for each of them.

Principle of operation

The operating principle of a fan coil unit is quite simple. The air is driven by the fan through the heat exchanger and is cooled or heated, depending on the selected mode.

In this case, the air flow is created not from the volume of air in the room, but from the outside air. Fresh air supplied by a special unit - a chiller. This device is paramount when creating an air conditioning and heating system for a building with a chiller fan coil system.

Chiller connected to supply unit, which produces air from the street.

Classification

Devices can be divided into four groups depending on design features:

• cassette;
• horizontal;
• console;
• console in the case.

When choosing a specific device, it is important to pay attention to two parameters: overall air performance and cold air performance.

Water as a carrier

Heat exchanger systems that use water as a carrier can be of two types: two-pipe and four-pipe.

Two-pipe is the most common on the market and its installation is not difficult. It is used to cool the air in the room and only, and therefore the cost of installing a pipe-type fan coil is low. It is possible to switch to heating mode in winter, but for this you have to disconnect the pipes from the chiller and connect them to heating system... This happens with a manually adjustable valve.

The four-pipe one has two heat exchangers: one is connected to the chiller, the other to the heating system. This scheme is more complicated in installation and the principle of operation, and, accordingly, is more expensive. It allows both cooling and heating the air in the room by switching the mode on the control panel.

What are they made of?

Each type of device has its own type of design, but everyone has common details:

• filter element. Protects the fan coil system from foreign particles entering it;
• electric heating element;
• heat exchanger. Cools and heats indoor air.
• fan. Provides a forced air flow that passes through the heat exchanger;
• control Panel.

Installation of chillers and fan coil units of any of the above types can be either wall-mounted, floor-mounted, or built into the ventilation of the building and installed in a suspended ceiling structure.

Advantages

There are several advantages to installing a fan coil unit together with a chiller.

1. Energy saving.
2. Possibility to connect an unlimited number of fan coil units to one chiller. In this case, the distance from the device to the farthest fan coil should not be more than 600 m.
3. High environmental safety. The equipment is much more environmentally friendly than air conditioners.
4. Creation of a comfortable indoor climate.
5. Providing complete cooling and heating in just 5 minutes after starting.
6. Saving money necessary for the organization of pipe routes, if water is used as a carrier. However, such a system has one drawback - the lack of a ventilation function. Therefore, when installing it, it is necessary to equip in parallel a system of forced circulation of air masses in the room.

Mounting

Installation of chillers and fan coil units consists of several main stages:

1. First, the device is mounted indoors.
2. Then the strapping unit is assembled.
3. Installation of pipelines and thermal insulation to them is in progress.
4. Air ducts are laid and their sound insulation is organized.
5. A drainage system is being created.
6. The equipment is connected to the mains.
7. Check the tightness.
8. Start the system.

Mounting by device type

Floor

The easiest installation process is to install a floor-standing fan coil unit without a condensate duct. They do not spoil the interior and can be installed independently. The typical design of such equipment consists of two nozzles through which the mixer and the working fluid go.

Cassette, wall and sub-ceiling

Mounting cassette fan coil unit and the other two are a little more complicated, since they can be either two-pipe or four-pipe. Moreover, their electrical system may differ significantly from floor systems.

Therefore, it is best to entrust the installation of a wall-mounted fan coil unit, under-ceiling and cassette, to specialists.

With the help of specialists

Connecting a fan coil is a complex process that requires professional approach, so it is best to consult a specialist. Only they will be able to competently do the work on:

• installing the unit in the most efficient location;
• assembly of piping units by installing the necessary taps, temperature and pressure control devices, valves;
• laying and thermal insulation of pipes;
• installation of condensate drain;
• connecting devices to the electrical network;
• pressure testing of the system;
• checking the tightness;
• water supply.

They will do all the calculations before starting work and will take into account the characteristics of the room and the load of each fan coil. Experts will create a safe and reliable system that will serve the user for a long time.

What to remember when contacting specialists

In order to correctly select a company that provides installation services, you should pay attention to the following criteria:

They can work in two modes: for space heating and for cooling. In this regard, there are the following options for piping the chiller-fan coil system:

— two-pipe system: in this case, the cooling in summer and heating in the off-season is carried out by the chiller. Sometimes thermal devices are included in the system in parallel with the chiller for heating in winter.

- four-pipe system: the fan coil unit is capable of operating in two modes (heating / cooling the air in the room), and for the heating mode, water from the heating system is used.

Let's take a closer look at the data of the strapping scheme:

A two-pipe system is a fan coil unit with one heat exchanger. The most common and trivial strapping scheme. One pipe is connected to the fan coil unit to supply chilled water to the heat exchanger, the other to lead it to the chiller (" return water"). In winter, the two-pipe system can be used to heat the room, the pipes are supplied to the boiler or to the heating system from city boiler houses, and the water supply from the chiller does not come. In the summer, the water supply from the boiler is blocked by a special valve, and the fan coil units are already operating on the water coming from the chiller. Thus, mixing of heat and coolant is allowed in the system.

Two-pipe connection diagram for fan coil units:

Simplified piping scheme for a 2-pipe fan coil unit (air heater):

Designations on the diagram:

1 - Ball valve.

2 - Filter.

3 - 3-way motorized control valve.

A two-pipe system is cheaper than a four-pipe system, but for its operation, if it is necessary to prevent mixing of the coolant, the water will have to be heated in an additional heat exchanger from the heat supply system and an additional circulation pump is needed. And this is additional operating costs. To supply heat energy in the off-season, you can use a reversible chiller (operating in heat-cold mode), which is able to independently heat water.

This piping scheme for fan coil units will serve as an excellent solution for offices, warehouses and during the reconstruction of buildings, where it is not always possible to lay a complex piping system with big amount nodes.

Detailed piping diagram of a fan coil unit using a 2-way valve:

Detailed piping diagram of a fan coil unit using a 3-way valve:

Four-pipe fan coil connection diagram:

A four-pipe system is a double-circuit fan coil unit (i.e. with two heat exchangers). In this system, each heat exchanger is connected to a pipeline with a cold and a hot heat carrier, respectively, each of the heat exchangers has its own valve for connecting the fan coil unit, which are controlled by the control panel for the fan coil unit. This system it is used when the coolant (for example, ethylene glycol) cannot be mixed with the coolant.

The piping diagram for a 4-pipe fan coil unit is a twin piping diagram for a 2-pipe fan coil unit.

A four-pipe piping scheme for fan coil units ensures their year-round operation for the office building; in the off-season, warm water can also be supplied to the circuit from a chiller, which works as a heat pump. In winter, the additional heat exchanger circulates hot water from the central heating system. The temperature of the coolant during the heating season is from 70 ° C to 95 ° C, which exceeds the permissible operating temperature for most fan coil units, therefore it must be reduced first.

The chiller supplies refrigerant to all fan coil units installed on each floor of the building. Hot water comes from the city heating network to all fan coil units through a special heating point, which is usually installed in the basement.

When designing a chiller-fan coil system, first of all, it is necessary to decide on the fan coil connection diagram and make a calculation hydraulic system... This should only be done by a heating engineer. After determining the heat surpluses for each room, a specialist selects a chiller (with or without an integrated hydraulic circuit) and fan coil units of the required cooling capacity, and also designs a piping scheme for fan coil units.

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Technical library ›Good to know› Air conditioning ›Tips for choosing and connecting a fan coil unit

Fan coil connection

2015-09-24 00:00:00

A fan coil unit is a complex climatic technique, therefore, when choosing it, special calculations should be made, which only an experienced heating engineer can handle. If the wiring diagram is selected correctly and worked out in detail, then during the installation of devices there will be no unforeseen problems. At the same time, only professionals should be trusted to install such equipment.

Due to the fact that the chiller-fan coil system can operate both for heating and cooling, there are two connection schemes:

1. Two-pipe, in which the devices work as coolers in summer, and as heater... In such a system, there is one heat exchanger, and in the cold season, water enters it from a third-party heater, for example, a boiler, and into a warm one - from a chiller. Such a system will allow either cooling all rooms in the building or heating. Li>
2. Four-pipe. Such a system is mounted in the same way as a two-pipe system, but has 2 independent circuits, each of which operates in its own mode (heating or cooling). In this case, the chiller prepares the coolant and through the hydronic module (pump group) distributes it to each of the fan coil units. The boiler or other device prepares the coolant and supplies it to each fan coil unit (fan coil unit) in its “warm” heat exchanger. As a result, in each separate room, all users can create their own personal temperature regime by turning on the fan coil for heating or cooling. This system is more versatile and suitable for constant and comfortable use.

The fan coil piping scheme is designed at the stage of equipment selection. In this case, it is necessary to take into account the heat surplus of each room in the summer and the lack of heat in the winter. It should be remembered that an unlimited number of fan coil units can be connected to the chiller, but each of them should be no more than 600 meters from the center. The power of the devices is determined by the needs of the users and the characteristics of the building.

There are fan coil units that are installed:

• in a false ceiling (cassette fan coil units),
• behind the false ceiling, in wall niche, technical room (duct) and distribute air through a system of air ducts and ventilation grilles and diffusers,
• on the floor or wall (cabinet, floor-ceiling),
• on the wall indoors (wall-mounted).

Most devices are designed for only two-pipe or only four-pipe connection method, so you should decide on the installation method before purchasing the equipment. Only a specialist can determine which technique is suitable in your case, and how it should be installed.

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