Gree R32 refrigerant air conditioner maintenance precautions

In today's society, energy and environmental issues are becoming more and more prominent, and the earth's greenhouse effect is becoming more and more obvious. The previous common R22, r410a, and R407C refrigerants have a high GWP (the index of the greenhouse effect of substances), which are non-environmentally friendly refrigerants and have a certain destructive effect on the climate. The international environmental protection convention stipulates that my country must complete the elimination of non-environmental refrigerants by 2030, and new environmentally friendly refrigerants R32 and R290 with lower GWP values u200bu200bwill become the new favorites of the industry.

(1) Disassembly of the connecting pipe

Since the connecting pipe on the indoor side of this type of air conditioner cannot be directly disassembled, if necessary When repairing the indoor unit system, you must destroy the anti-disassembly nut. The specific operation steps are as follows: 1) Recycle the refrigerant first, and then turn it off after power-on Size spool.

2) On the connecting pipe, find the position 15cm away from the anti-disassembly nut, and cut it with a cutter, as shown in Figure 1. Since the cutter cannot rotate 360 u200bu200bdegrees, you need to shake the connecting pipe left and right by hand during actual operation to separate and disassemble it.

3) After separating the connecting pipes, immediately wrap the connecting pipes and the nozzles of the evaporator with tape. To prevent dust from entering, as shown in Figure 2. Finally, the indoor unit and evaporator are disassembled, repaired or repaired for leaks. For safety reasons, it is recommended that the indoor unit be transported back to the maintenance department for inspection and repair.

(2) Secondary installation after maintenance

1) When installing the connecting pipe, it is necessary to reserve the welding position of the anti-disassembly nut fittings, and remove the irregular elliptical part of the copper pipe, as shown in Figure 3.

2) Clean up the burrs at the bell mouth, and weld a new anti-disassembly nut on the connecting pipe. The size of the anti-disassembly nut is shown in Figure 4.

3) Cut off the large and small joints of the copper pipes of the evaporator, clean the burrs on the bell mouth, and weld new joints.

4) Docking the connecting pipe with the indoor unit, and tighten the connecting pipes with a wrench.

5) Vacuum, maintain pressure, open the size of the valve core, tighten the back cover nut, and finally install the valve handle, as shown in Figure 5.

Tips:

1. The refrigerant R32 has a certain amount of flammability When welding the pipeline, it is strictly forbidden to have combustibles within 2m of the operating point.

2. The indoor unit of this type of air conditioner is equipped with an anti-disassembly nut. If the indoor unit needs to be removed for maintenance, the connecting pipe must be cut off, and dust-proof and waterproof protection measures must be taken at the same time.

3. In the second installation, in order to avoid burning the indoor unit parts, it is necessary to weld the anti-removal nut on the indoor unit end connection pipe first, and then carry out the docking.

4. Since the air-conditioning pipe pressure using R32 is slightly higher than the air-conditioning using R410A, the extension pipe needs to use better quality copper pipe, and it is strictly forbidden to use inferior connection pipes on the market.

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