FAQ

When the voltage supply is too high or too low the unit protection is activated and stop the system until the voltage become to normal value

This phenomenon can take place during Deicing procedure in heating mode, it’s a normal operation of the AC.
And part of its protection mode. During deicing the unit will defrost accumulated ice layer on the outdoor unit.
Due to this procedure ice is melt and some of water drops may turn to steam, this process should take no more then 10-12 min .
And can be repeated from time to time.

It looks like the unit is running in cooling mode under low ambient conditions.
It can happened from time to time since the unit is cooling the air which can result by generating mist, please verify that the indoor unit air filters.
Are clean it may reduce the phenomena.

Allergens are impurities in the air that can bring on an allergic reaction. In an urban environment, a mixture of these allergens with other impurities present in the air – called adjuvant substances – such as Diesel Exhaust Particles (DEP’s) produced by engines and Volatile Organic Compounds (VOC’s) present in building materials, cosmetics, etc. can turn allergens into heavy allergens. These in turn can have increased negative health effects such as aggravated symptoms and the triggering of latent allergies.

There can be 2 main reasons for it :

1. First reason is related to the minimum compressor time off meaning if the unit was on and was shut down and them put on again The minimum compressor starting time will be 3 Min in order to protect the compressor.
2. second reason is if the unit is in heating mode the indoor fan will not start till the indoor coil will be hot enough preventing cold draughts.

1. As a first stage the compressor is discharging the refrigerant which is in a gas state into the condensing coil, since the refrigerant is on the compressor discharge high pressure side it will be heated and will flow through the condensing coil.
2. During the refrigerant flow in the condenser coil the high discharged pressure gas will release its heat, due to the air pushed by the outdoor fan via the condensing coil
   And the refrigerant will become sub- cooled and will change his state to liquid at high pressure.
3. At this point the high sub-cooled liquid will go through an expansion device, limiting its passing space through an “orifice” which will cause an immediate pressure drop.
   Resulting with a refrigerant at liquid state with a temp drop as well.
4. The liquid low pressure refrigerant will flow via the evaporator coil and will absorb the indoor room inlet air heat, due to the indoor fan blowing the air through the evaporator coil.
   Due to this heat absorb by the refrigerant, the air passing through the indoor coil will get cooler and the refrigerant will start boiling and changing its state from low pressure liquid to low pressure gas till returning to the compressor.

Only an ill maintained air conditioning system can make you ill. A well maintained air conditioning system can only contribute to a healthier environment.

Humidity

Because it controls humidity levels the growth of dust mites and molds is reduced. Air conditioning maintains humidity levels of 40 – 60% which is positive for persons with allergies.

Ventilation

Air conditoning may have integrated ventilation. Mechanical ventilation is getting more and more important because of the way houses are built these days. The supply of fresh air will prevent the sick building syndrome.

Filtration

All units are equipped with a filter. Depending on the type of system and the needs of the customer, the type of filter will vary. The effecitiveness of a filter goes from catching dust and particles over fine dust and pollen, bacteria, virusses and odours and even microbes and smoke.

It is essential to replace the filters on a fixed period. When you replace the filters too late you risk that the oversaturated filters start distributing bateria instead of catching them.

Draught

When the equipment is correctly selected there will be no draught. This is the job of specialists and should be calculated by an installer. A system with too low capacity will not be able to reach the desired temperature. A system with too high capacity will lead to draught and fluctuating temperatures.

Throughout the ages, we have sought to improve the level of comfort offered by our surroundings. In colder regions, we have tried to heat our dwellings and in warmer climates, to cool them down because if we are not comfortable, we can neither work nor relax. But thermal comfort vital to our well being, is subject to three basic influences:

The human factor

our clothing and activity level and how long we remain in the same situation

radiation temperature and surrounding temperature

Our space

its temperature, velocity and humidity

The air

Among these influences, the human factor is somewhat unpredictable

The others can be controlled in order to provide that much sought after feeling of well being.

Changing patterns in construction, working practises and internal occupancy levels have created

new parameters within which designers must operate.

Modern buildings for instance, generate far more heat than their predecessors of say, 50 years ago and there are several reasons for this

Solar Infiltration

Developments in building technology have also given rise to an increased use of glass – even when solar protective glazing is fitted, solar gains can be considerable.

Occupants

Increasing numbers of occupants, each generating some 120W/h of heat, are routinely stuffed into office areas

Electrical Appliances

Computers, printers and photo copiers, all part of the modern offices scenario, also generate substantial heat loads

Lighting

Many modern shops could be adequately heated by their

lighting alone heat gains in the order of 15-25W/m² are not uncommon in Europe

Ventilation

Introducing the outside air into a building also introduces its temperature something of a problem if it’s 30ºC outside!

Heat always flows from a warmer substance to a cooler one. In reality, the faster moving molecules transfer some of their energy to slower ones. Thus the faster molecules slow down a little and the slower ones speed up. Expressed simply, this means that when it is hot outside, the heat attemps to ‘invade’ colder interior spaces.

Heat can be transferred from one body to another by any of the following methods:

Radiation

By a wave in motion (similar to light waves) in which energy is transmitted from one body to another without the need for intervening matter. 

Conduction

By the flow of heat between parts of a substance or from one substance to another in direct contact.

Convection

By transfer via a fluid or air.

Cold draughts are sometimes associated with air conditioning and indeed, this can be caused by incorrectly conceived systems. The likely effect on personnel resulting from the location of the indoor unit and its air distribution pattern must therefore be considered at the design stage.

The height of the ceiling is also relevant. Air conditioning equipment manufacturers generally assume the optimum ceiling height for a direct expansion system to be between 2.70 and 3.50 metres. Cold air at about 16°C supplied from this height is able to mix with warmer room air before reaching personnel level, thereby obviating any feeling or draught.

Notwithstanding this, in applications not meeting this general standard, a quality air conditioning system can invariably be “tuned” to compensate.

Clearly, unit location as well as ceiling height and shape have a major influence on draught or the lack of it. Explaining this requires a few comments concerning the properties of cold air. Cold air has a tendency to “stick” to the ceiling for a period prior to descending. This is known as the “coanda” effect and it helps the cold air and surrounding air to mix before dropping down into the room

Unfortunately, the existance of any barrier such as a ceiling beam, has a detrimental effect on this by interrupting the air flow. In such a case, cold air colliding with the beam will sink immediately, to the certain discomfort of any individual unlucky enough to be seated directely below.

Similarly, two units located opposite to each other will generate cold air flow collision in much the same manner.

The terms COP (coefficient of performance) and EER (energy efficiency ratio) describe the heating and cooling efficiency of air conditioners. They indicate the ratio of heating or cooling provided by a unit relative to the amount of electrical input required to generate it. Thus, if an air conditioner generates 5kW of heat from a 1kW electrical input, its COP is said to be 5.0. Similarly, if an air conditioner generates 5kW of cooling from a 1kW electrical input its EER is also said to be 5.0. The higher the COP and EER, the more energy efficient is the equipment.