AUX air conditioner service manual
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temperature value shall be determined by the industry & mineral enterprises, scientific & research
institutes, medical and sanitary units according to their own specific purposes.
The process of air temperature conditioning is substantially the process of adding or reducing sensible
heat. The value of the air temperature also expresses the quantity of the sensible heat of air.
⑵Humidity conditioning
In addition to maintain an appropriate indoor temperature, there is also a demand for maintaining an
appropriate indoor humidity. The human body will feel comfortable if the relative humidity is between
50%-60% in the summer and 40%-50% in the winter.
The process of air humidity conditioning is substantially the process of adding or reducing latent heat.
The quantity of the water vapor contained in the air shall be conditioned during this process.
⑶Airflow conditioning
The temperature and humidity conditioning can be realized only by the way of air flowing. In this case,
the airflow conditioning is vital in air conditioning process. The airflow conditioning and distributing
directly impact the operation effectiveness of the air conditioning system. The air re-circulating speed
in an air-conditioned room shall not over than 0.25m/s.
⑷Air cleanliness conditioning
The harmful gas and dust existing in the air easily penetrate into the human being’s windpipe and lung,
etc, and all the dust are usually accompanied by the infecting virus to cause kinds of sickness. So, the
filtering process to the air is quite necessary during the air conditioning process. The air cleanliness
methods include: Ventilation & filtration, adsorption, absorbance and catalyzing combustion etc.
Section two the basic knowledge of refrigeration
1. Refrigerant
Refrigerant is also called refrigeration Working Medium. The first letter “R” of the English word
“Refrigerant” stands for it. It absorbs the heat by boiling away the liquid through the variety of its own
state in the refrigerating device and transfers the heat released from the gas’ liquefaction process to the
surrounding medium materials inside the condenser with the impact of the third party’s work. The
state variety of the refrigerant within the system is a kind of physical variety with the only function of
absorbing heat and transferring heat but without any change to its property. There are around more
than eighty kind of refrigerant available now and some others are under development.
⑴The Refrigerant kinds
According to the chemical composition, the refrigerants can be classified as follows:
①Inorganic compound refrigerant
These kind refrigerants were applied earlier for refrigeration purpose, such as the air, water, Ammonia
and Carbon dioxide etc. Among them, some were washed out already. The typical sample is Carbon
dioxide with the disadvantage of high working pressure, low critical temperature, small capacity per
unit and low refrigeration performance. As the replacement item, the Ammonia is one of the Inorganic
compound refrigerants being applied widely. R717 stands for it.
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