Air conditioning refrigerant leakage fault detection and replacement

Air-conditioning refrigeration cycle system if there is leakage fault, can make the refrigeration effect. When the air conditioning refrigeration system of refrigerant leakage exceeds 40% of the total, basic can't guarantee the refrigeration effect. The solution is to add and replace the refrigerant, the work is relatively complicated, the necessary equipment and tools is more, but this is air conditioning maintenance staff to master the basic skills of * *. The following main introduce severe air conditioning refrigerant leakage after repair and replacement steps, for your reference. A, refrigerant leakage detection of refrigerant leakage check air conditioning refrigeration system, the special detectors are available, and mainly include electronic and flame type two kinds of leak detector. Including electronic leak detector is mainly composed of control amplifier and probe, use when plugged in, turn on the switch, to probe the sensing electrode preheated to a stable state, and then, the sensitivity of adjustment and calibration control amplifier in flammable environment, with air inlet on the air conditioning pipe of the probe for detecting suspects, when the buzzer issued a ringing sound control amplifier, namely the probe inlet ( The detection point) For leaks. If you do not have the leak detection equipment, usable soap water leak test detection, method is to use brush will be 70% of the soap solution applied to the pipeline or joint suspected leak. If appear constantly soap bubbles, explain for leaks, otherwise there is no leakage. After found to leak, a leak parts should be replaced, can't replace welding torch to repair welding, leak point are available until no leak. Second, the refrigerant replacement of air conditioning refrigerant leakage is more than 40% of the total, should replace the refrigerant. 1 MPa, then close the vent valve on the cylinder. Note: in the temporary filling the refrigerant step, shall confirm the vacuum pump power switch in the off state. For each repair or welding parts for leak detection and confirm no leak, then open the manifold valve C joint ( With a valve core rod) And between the vacuum pump and hose connection, will discharge refrigerant in the refrigeration system. Vacuum joint on C to twist, and between the vacuum pump and hose connection ( Not leak tight to) 。 Confirm the refrigerant cylinder valves and manifold H1 dial on the valve has closed completely, open the vacuum pump power switch, start pumping air into vacuum state. At this point, the comprehensive pressure gauge pointer to low pressure readings on the direction of rotation. If the pointer is not rotational, should check whether the C joint valve core is jammed or full. Such as pressure gauge pointer soon turned to low pressure readings, it is likely to be liquid pipe damage, no cushion valve or not open it. Vacuum pump vacuum time is commonly: at room temperature in 15 - At 30 ℃ for 30 to 40 minutes; Room temperature below 15 ℃ or long time without refrigerant is 60 ~ 90 minutes; At room temperature for more than 30 ℃ for 10 to 20 minutes. After the process of pumping air into vacuum state, should be closed immediately manifold LO dial and gasket on the valve valve, disconnect the vacuum pump power switch. Filling the refrigerant liquid refrigerant cylinders placed in desktop scales, the weight of the record label at this time, The weight of the refrigerant and the cylinder) ； When refrigerants filling the air conditioning refrigerating system, reduces the weight of the refrigerant in the cylinder, thus filling the refrigerant. Cushion valve and LO * * open without a village on the dial and the cylinder valve, filling the refrigerants, when almost close to the front of the required without padding valve, at 10 minutes, then slowly open without padding valve, slowly add refrigerant, straight slightly less than or equal to all requirements. Closed LO * * on the dial and the cylinder valve, filling the refrigerants in the process is complete. Refrigerant filling after processing after filling the refrigerant, still should make a leak check, after confirm no leak, closed without padding valve, pull down the pipeline and equipment of the connected to the air conditioning compressor, leaving only connection compressor liquid tube and no padding valve ( As shown in figure 2) 。 Use A liquid pipe heating, flat this pipe clamp pressure, and keep the clamp on the segment, to open the check valve leaks after cooling. Confirm no leakage, careful cut with pliers pipe section B, * * with torch and hot melt, in a closed tube, remove the clamp. Considerations for filling the refrigerant of the maintenance work should be performed in a well-ventilated room. Refrigerant and frozen oil could shoot work, be careful not to make them directly from our hands and face; When welding, should avoid broken copper powder fell into the tube, damage the compressor; After adequate refrigerant, should be to run the refrigeration test, determine the refrigeration effect is satisfied.

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