1, the air conditioning has been used for more than five years;
2, Move the machine for several times (the air conditioning units may consume part of Freon when emptying air during the process of removing);
3, the exposed crude pipe at the connection point (ie, low-pressure pipe) of the machine does not condense or is not cool in summer;
4, the wind come from the summer exhaust fan outside the machine is not hot;
5, the gas pressure (thick tube) in summer back should be not less than 0.4 MPa;
6, the operating current of compressor is less than the normal value in the nameplate;
7, the high-pressure pipe (thin tube) is frosting in summer;
8, the machine inside of the air conditioning in summer is icing or blowing fog (sometimes accompanied by leaking inside the machine);
9, the brass interface thick pipe outside the machine is not hot in winter;
10, there are leak points in the air conditioning;
11, the air conditioning is stopped after ten minutes of starting up (low-voltage protection, overheat protection).
How to add Freon in the air conditioning?
First, turn on the air conditioning;
When adding Freon in summer, we can allow the air conditioning to run directly in the cooling mode. Because it is impossible to add Freon in the state of the heating operation, fluoride in winter, use a heating method to pull valve line, forcing air into the refrigeration state.
Second, connect the fluoridation equipment;
After the normal starting of air conditioning, such as ceiling air conditioner, connect the craft port side of the low pressure valve of the outdoor unit is connected fluoridation equipment. This process must drain fluoride tube of air and dirt.
Third, manometry and fluoridation;
Summer to observe low pressure and an ambient temperature of 32 degrees Celsius, the pressure control about 0.45MP;
Winter observed when the high pressure in the heating, the pressure is stabilized controlled at about 1.7MP.
Fourth, remove the equipment which is used to add Freon;
To remove fluoridation equipment in the state of refrigeration, tighten the sealed cover in the machine outside, while removing the device in the heating state may cause the leaking of a lot of Freon.
Fifth, finish the process of adding Freon.
Check the air conditioning which is be suspected to be with leak points with bubbles produced by washing fine.
www.airconditionings.cn has also constructed four state-level product performance- testing centers for packaged air conditioners, high-temperature-use air conditioners, air and water- cooled chillers and FCU & AHU. Moreover, a joint laboratory named Shenling-Siemens network-based professional lab for air-conditioning operating & monitoring system was set up in Shenling, which was the first lab of this kind co-constructed with Siemens in HVAC industry in china.