The central air conditioning refrigerant filling methods

the international application, the following methods often can use testing adequacy of refrigerant in the refrigeration system, let's resolve the disadvantages of the filling way:

1, with the hand touch the suction, exhaust pipe perception of copper tube heat and cold;

2, observing the air bubbles in the liquid lens;

3, high and low pressure measurement;

4, measure the compressor current;

5, and calculated the heat;

6, watching what is on the condensation of the suction;

7, according to the weight note.

1, touch the suction, exhaust pipe perception of copper tube cold hot

everyone to the feeling of hot and cold, if your hands are long calluses, you had higher temperature than the actual perception. Usually the body feel is very hot, about 37 ℃ higher than the below 37 ℃ feeling is cool. Skin temperature limit of perception for 49 ℃, so you hand the metal tube temperature perception is not necessarily good condensing temperature.

2, observing the air bubbles in the liquid lens

it does show that there are air bubbles said lack of refrigerants, but the pressure loss of fluid pipe can also cause bubbles. If the liquid pipe pressure loss is very big, the liquid refrigerant will flash as gas, flash gas flow in expansion valve will reduce the flow of refrigerant will erode expansion valve. If the system super-cooling degree is small, the pressure loss is easy to produce bubbles in sight to see in the mirror.

if you see on pressure loss caused by air bubbles in the liquid mirror was not caused by lack of refrigerant, then you continue to charging refrigerant to eliminate air bubbles, you will find that the high pressure rise and cause a jumping machine. This method can't correct judgment system of refrigerant injection quantity.

3, measurement of high and low pressure

this method use is more, but pay attention to the condensation and evaporation air volume does not meet, will affect the refrigerant pressure test. If the cooling air volume less than high pressure will be very high, if the evaporation of the expansion valve system under low pressure will be very low air volume. Before you test the system pressure, must confirm the condensing evaporating air volume to meet. Finned coil, filter to clean, fan speed right; Check the fan blade without deformation, damage, properly installed on the shaft.

4, measure the compressor current

this method use is more, note, however, in the case of different test current is also different, for example, the influence of the current acceptor power supply voltage, voltage deviation caused by the deviation of current.

5, and calculated the heat

by measuring the evaporator on the suction temperature and pressure of the suction value to calculate the degree of superheat, pressure value into value minus the suction temperature difference, namely for the heat.

note, however, if in the cold day in order to guarantee the correct superheat blunt note system, refrigerant in the hot weather system too much. For expansion valve system, it is easy to rush too much, because of the expansion valve will automatically open and close, excessive or insufficient refrigerant flow through the coil, will remain the same degree of superheat, if realized this, can make the condenser inside accumulate more refrigerant, cause high pressure increases, current is big, the compressor damage.

6, watching what is on the condensation of the suction

the capillary system to note refrigerants and will oversee the condensation of the suction pipe, this method depends on capillary refrigerant injection at the ends of the liquid flow rate and pressure difference value. Capillary only run at the design condition, the effect of heat transfer in the evaporator to get into full play. Refrigerant according to load variation and found that if the evaporator air volume flow through the evaporator, prevent the formation of the frost tube. If the load is reduced, the liquid refrigerant will flow through the evaporator, enters the suction, surrounding the water vapor in the air condenses on the copper tube. If there is enough liquid refrigerant, tube will occur.

but note that this method used in the thermal expansion valve system, will find dew tube produce does not represent refrigerants of blunt note amount ( Even if rush too much refrigerant injection) Due to expansion valve will automatically adjust temperature.

7, weighing note ( This is a good way)

in fact, weighing filling method is a good method in the above several methods, it is applicable to any refrigeration system. Its method is to weigh the weight of refrigerant charging. As long as the manufacturer on the nameplate to point the &water-cooled packaged or fission machine filled volume of the right. This method is approved by the recommended filling method.

note: blackout over 12 hours boot device, you must first make the crankcase heater preheating, aims to frozen oil crankcase mix some liquid refrigerant evaporation, avoid inhaling liquid refrigerant compressor, caused by fluid compression.

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