The refrigerant in the form of dry superheated steam is sucked in by the refrigeration compressor through a suction pipe (low pressure, low temperature). The refrigeration compressor compresses the gas and injects it into the refrigeration condenser (high pressure, high temperature).
For the refrigeration system to work, in addition to building the refrigeration system, it is also necessary to provide an adequate amount of electrical energy, most of which is consumed by the refrigeration compressor to force the refrigerant to circulate in the system. The remaining part enables the work of fans and electronic systems controlling the operation of the device.
The fan assembly is tasked with forcing the air flow through the condenser and evaporator systems.
The appropriate selection of the unit's capacity to the prevailing conditions in the room is crucial to the correct operation of the unit.
The parameters that influence the capacity of the unit include:
The main purpose of air conditioning is to provide a sense of comfort in the operating area of the unit. When using a conventional fixed capacity device, some problems may occur. However, these problems are completely eliminated if the Inverter technology is used.
ALTERED CAPACITY AT LOW OUTDOOR TEMPERATURES
The INVERTER compressor has the ability to work with higher efficiency, so that the capacity of the device is maintained in a larger range of outdoor temperatures.
LONGER PERIOD OF TIME TO ACHIEVE THE SET TEMPERATURE.
Increasing the power at start-up allows the INVERTER device to reach the desired room temperature faster than a similar conventional device.
SUDDEN TEMPERATURE CHANGES.
Specific operating parameters of conventional devices (ON / OFF) cause temperature fluctuations in the room at ± 1,5ËśC. In the INVERTER devices, thanks to the capacity of the device changing in relation to the demand at a particular point in time, the difference between the room air temperature and the set temperature is within the range of ± 0,5ËśC.
LARGE STARTING CURRENT OF THE COMPRESSOR
The INVERTER device starts with low revolutions, so the starting current is reduced to the minimum.
In order to ensure adequate air flow through the heat exchanger of the indoor unit, it is necessary to use an air filter. Such a filter retains dust particles on its surface, which could otherwise clog the exchanger.
For the most part, Fujitsu GENERAL air conditioners are equipped with standard air filters. The exception are ducted units with the capacity of 7 ÷, 25 kW. Due to the specific installation method of these units, air filters are not included in the set with the new unit, but can be purchased as an option.
Individual types of standard and additional filters:
Various models of indoor units (wall mounted, ceiling, ducted, cassette) can be connected to the multi inverter outdoor unit.
The exact description of the permitted combinations for the specific outdoor units can be found in the description of the MULTI INVERTER system.
The year-round operation mode allows conventional equipment to operate at low temperatures. By adding the components of the set (fan speed controller and compressor crankcase heater), we are able to ensure appropriate operating conditions for the outdoor unit throughout the year.
Thanks to the variable adjustment of the speed of the outdoor unit’s fan, the condensation pressure remains at the right level. By installing the compressor’s crankcase heater, it is possible to prevent the thickening of the oil and its loss of lubricating properties.
The ARCTIC option facilitates the operation of the devices in heating mode in the winter period. At temperatures < 5ËśC, additional heaters are activated, which prevents the occurrence of undesirable phenomena (freezing of the exchanger of the outdoor unit, freezing of the drip tray, oil thickening).
The set includes: compressor’s crankcase heater, outdoor unit’s drip tray heater, klixon, and additional electric clamp.
The reasons for which chlorine-containing agents are being phased out result from the discovery of certain phenomena occurring after such agents have been released to the atmosphere. When released from the installation, a molecule of an ozone depleting substance travels as far as the stratosphere (15 ÷ 50 km above the earth). Under the influence of UV radiation, the process of photodissociation takes place, where a chlorine atom separates from the refrigerant molecule, and breaks the ozone molecule. This reaction creates: chlorine oxide + oxygen molecule (Cl+O3=ClO+O2) is formed, then chlorine oxide reacts with another ozone molecule (ClO+O3=Cl+2O2), etc. It is estimated that a single chlorine atom can destroy 10 ÷ 100,000 ozone particles.
The Fujitsu devices which are currently being launched on the market use: R407C and R410A refrigerants whose ozone depletion factor equals 0 (they do not contain chlorine atoms).
The basic differences are briefly described in the table below:
|
HCFC REFRIGERANTS
|
HFC REFRIGERANTS
(do not contain chlorine atoms)
|
|
NAME OF REFRIGERANT
|
R22
|
R407C
|
R410A
|
CHEMICAL FORMULA / COMPONENTS
|
CHClF2
|
HFC32 / HFC125 / HFC134a
|
HFC32 / HFC125
|
MIXTURE COMPOSITION [%]
|
100
|
23 / 25 /
52
|
50 / 50
|
TYPE OF MIXTURE
|
SINGLE COMPONENT
|
ZEOTROPIC MIXTURE1
|
AZEOTROPIC MIXTURE2
|
SATURATION PRESSURE
26ËšC [MPa]
|
0,9714
|
1,126
|
1,608
|
OZONE DEPLETION POTENTIAL ODP
|
0,034
|
0
|
0
|
GLOBAL WARMING POTENTIAL GWP
|
1700
|
1700
|
2000
|
OIL
|
MINERAL OIL (SUNISO)
|
SYNTHETIC (ETHER OR ESTER)
|
It is possible to start the device in four different operating modes: cooling, heating, dehumidification, or ventilation. However, the possibility of activating the chosen operating mode depends on the model of the air conditioner.
Cooling only units:
Cooling and heating unit (heat pump):
The AIRSTAGE VRF cooling and heating systems possess additional restrictions. Namely, when any indoor unit is switched on, the entire system is set to the appropriate operating mode. No other, later activated indoor unit may operate in a different mode, e.g.:
In the event of an attempt to activate an operating mode that is invalid at that moment using the wireless remote control, a sound signal is generated by the indoor unit (5 short signals).
If the indoor unit does not want to switch on (does not react to signals sent from the remote control). The following elements should be checked: