Fan coil 4 x pipe channel. Four-pipe fan coils
Based on the number of heat exchangers, fan coil units are available: with one heat exchanger and two heat exchangers. They are called, respectively, two-pipe and four-pipe fan coils (according to the number of pipes required to connect a given fan coil).
Almost always, each heat exchanger is connected to a separate operating circuit, which provides the supply of chilled or heated water. In a four-pipe fan coil, both heat exchangers can operate simultaneously in one mode (cold or warm), as well as in different modes (one for heat, the other for cold) and, of course, one can work and the other cannot work. Such diversity in the operation of a four-pipe fan coil depends on the purpose for which and to which circuit each heat exchanger is connected. As an example, we can cite next way connections: one heat exchanger to the chiller, which works only for cooling, and the second heat exchanger to the system central heating- for warmth.
Current 4-pipe series:
- Four-flow compact cassette fan coils DF-300-500QAE-P4
Four-pipe fan coil units DF-QB-P4 series
DF-QB-P4 is a series of four-pipe cassette fan coils in an ultra-thin casing. The height of the case is only 250mm. Therefore, DF-QA-P4 fan coil units can be installed in limited space between the main and suspended ceiling. Minimum distance between the main and suspended ceiling corresponds to 330mm.
The standard configuration of four-pipe cassette fan coils includes the following devices:
- Infrared remote control remote control MD-R51. Elegant remote control allows you to turn the fan coil unit on and off, select one of three fan rotation speeds, turn on the auto-blinds mode and change the angle of the air dampers, select cooling or heating modes.
- The multifunctional automation unit controls the operation of the drainage pump fan and three-way capacity control valve. The block has protective functions, allowing to prevent failure of components, as well as any emergency situations.
- Drainage pump allows condensate to rise to a height of 500-750mm.
- Electric drive air dampers.
- Air filter with cleaning class G2
Additional features of cassette fan coil units
- Using an optional wired remote control. Wired remote control MD-KJR-10, MD-KJR-12 is optional. Additionally, it has the functions of creating and programming time intervals for fan coil operation.
- Use of a three-way capacity control valve and an optional drain pan for the three-way valve.
- Connecting fan coil units to a group or central control system. The Dantex group control system allows you to control up to 256 fan coil units connected to one group. There is also the possibility of integrating a group of fan coil units into an integrated building control system.
Four-pipe fan coil units DF-QA-P4 series
Cassette fan coil units of the DF-QA-P4 series are compact and elegant devices that can be used for cooling and heating air in public and administrative premises of offices, restaurants, shops, etc. They can be installed in Armstrong-type suspended ceilings or suspended ceilings of other designs. dimensions housing and decorative panel corresponds to the size of a standard Euro cell suspended ceiling ARMSTRONG. The DF-QA-P4 series includes four standard sizes and covers a cooling capacity range from 3 to 5 kW.
They are actually indoor air conditioning units that are used in conjunction with chillers (water coolers). They are similar in design to indoor units freon systems, however they work without freon. A four-pipe fan coil differs from a two-pipe fan coil in the presence of two water coolers. It is reasonable to use such devices in buildings where water from the heating system can be used. Since the water temperature reaches 90 degrees, heating can be carried out using a smaller heat exchanger.
How many heat exchangers are there in a four-pipe fan coil?
Peculiarities
The fan coil unit is controlled independently of the chiller. It is enough to monitor only the flow and temperature of the supplied and returned water. Since the 4-pipe fan coil has this significant difference from freon systems, there are no restrictions on the choice for the user. You can appreciate the variety in our online store, where models of climate control equipment are presented.
A higher coolant temperature - 7/12 degrees - requires more air flow during cooling. In this regard, the air at the outlet of the fan coil has high temperature, which limits moisture condensation on the heat exchanger. This reduces the risk of drafts and improves indoor comfort.
Characteristics
4-pipe fan coils can be used both as an air conditioner and as a heater. In order to save space in the room, it is enough to install the unit behind a suspended ceiling (cassette). With the help of a decorative panel, you can cover all the wires without disturbing the overall style of the room.
Channel 4-pipe
Safe for environment 4-pipe fan coil has an electric motor alternating current. Various models are divided into devices with 3 and 5-speed motors, which are characterized by low energy consumption. This property can be used for air conditioning large areas: hotels, shopping centers and large halls.
Control valve
When choosing four-pipe fan coils in the online store site, you can always contact qualified consultants. Experts will help you choose the most suitable option according to the requirements and type of premises. Favorable purchasing conditions will help you make an informed choice.
How to buy?
Do you want to buy a 4 (four) pipe fan coil for an office or production? Are you unsure about your choice? We will be happy to advise you and select the desired model, if necessary, we will do a ventilation and air conditioning project and, of course, we will carry out high-quality installation on time!
There are 2-pipe and 4-pipe fan coil units. In addition to the obvious difference in the number of pipelines connected to them, they also differ in functionality.
2-pipe fan coils
Figure 1. Refrigeration scheme using 2-pipe fan coils
The most simple circuit cooling supply - a scheme using 2-pipe fan coils. In this case, one pipe at a time water is coming to the fan coil units (forward flow), and through another pipe - water from the fan coil unit to the chiller (reverse flow). A diagram using 2-pipe fan coils is shown in Figure 1.
At the same time, as can be seen from the diagram, in this system the fan coils can work either all for heating or all for cooling. Actually, this monotony is the main disadvantage of the scheme with 2-pipe fan coils.
The only thing that can be done to simultaneously cool and heat is to organize two main risers. As you know, the southern part of the building always warms up more than the northern one, so during transition periods there may come a time when the southern side of the building still needs a cooling mode, and the northern side already needs a heating mode.
In this case, the building is divided into two zones, each of which has its own two-pipe riser. Goes to one riser cold water from the chiller, and in the other - hot water from the heating system.
All other methods of organizing simultaneous cooling and heating involve the use of 4-pipe fan coils.
4-pipe fan coils
The scheme with 4-pipe fan coils is a completely double-circuit scheme with two heat exchangers in each fan coil. Each fan coil heat exchanger is connected to its own system - one to a pipeline with cold water, the other - to the hot water pipeline.
Accordingly, without unnecessary loss of efficiency, some fan coil units can work for cooling, while the rest can work for heating. This system allows you to control the climate in the building with maximum flexibility and efficiency.
GENERAL VENT fan coil units are equipped with 4-pipe heat exchangers as standard. All units are equipped with one fan and have a compact design. The unit body is made of galvanized steel sheet on both sides covered with non-flammable thermal insulation 3mm thick, which provides reliable heat and noise insulation. The front panel is made of high-quality impact-resistant plastic and is equipped with automatic controlled blinds and an infrared receiver. Standard color is white (RAL9010). Additionally, GENERAL VENT 4-pipe fan coil units can be equipped with electric heater power from 1 to 4 kW, network card RS-485 for connection to the building management system, as well as a wall-mounted control panel. The following fan coil design elements are located inside the housing:
- copper-aluminum 3-row heat exchangers;
- centrifugal fans with asynchronous or EC electric motor;
- EU3 class air filter;
- drainage pump;
- drain pan for collecting condensate;
- additional drain pan for the mixing unit;
- automation unit;
- electrical switching unit.