Several maintenance precautions for R32 refrigerant

Several maintenance precautions for R32 refrigerant are as follows:

1. Maintenance site

Smoking is strictly prohibited during the maintenance process, and the operation is within two meters. Fire or heat sources are strictly prohibited in the area, and maintenance while smoking is strictly prohibited.

II. Precautions for the maintenance of the R32 internal unit pipeline

The indoor side connecting pipe of the R32 split unit cannot be removed, so when the indoor unit system is involved, it needs to be returned When repairing at professional outlets, the anti-disassembly nut must be destroyed.

1. Use a cutting knife to cut the size of the connecting pipe 15-20 mm away from the anti-disassembly nut.

2. Weld a new anti-disassembly nut fitting on the connecting pipe.

3. Refrigerant recovery

It is strictly forbidden to determine the closing time of the large valve based on experience and open the outdoor The recovery time of the refrigerant is greatly affected by the operating frequency of the whole machine, the operating wind speed, and the climate. Based on experience, it is difficult to judge the time when the refrigerant is completely recovered. When the system is under negative pressure, there is leakage on the low pressure side at this time. , Will inhale air, there is a greater safety hazard.

The correct operation method:

Connect the pressure gauge, and determine the closing time of the large valve according to the pressure. The specific steps are as follows:

1. Tighten the pressure gauge knob

2. Loosen the pressure gauge end hose slightly counterclockwise

3, the pressure gauge end is soft Connect the pipe to the filling nozzle and tighten it.

4. Tighten all the hoses (exhaust the hose air) for about 2 seconds after the hose on the pressure gauge end has air ejected.

5. Close the small valve. When the low pressure drops to 0.05MPA, immediately close the large valve and cut off the compressor power supply.

Four. Check the hose

Check the air tightness (confirm that the hoses of the pressure gauge are well sealed).

Correct operation method:

Check the tightness of each connection point after tightening the hoses to ensure a good seal

5. Welding

Strictly implement welding operation specifications and correct operation methods

1. Use pressure vessels that comply with national regulations. Comply with the chemical industry standard 'Safety Regulations for Hot Work in Plants

2, use brand welding tools.

3. Welding oxygen and combustible gas must have pressure gauges and tempering devices.

Operation requirements:

The operator must have a welder operating certificate issued by the national labor department. Keep gas cylinders and oxygen cylinders away from fire sources and avoid high-temperature sunlight.

Six. Additional refrigerant

1. It is strictly forbidden to add refrigerant by feeling, and run at this time The high pressure rises and the low pressure changes to negative pressure. There is a hidden danger of air intake in the system, and the temperature of the compressor casing rises.

2. It is strictly forbidden to unplug the external fan or the fully shielded condenser to check for plugging and leak detection, and it is required to use quantitative additional refrigerant to charge.

3. It is strictly forbidden to use inferior or fake refrigerants.

Individual maintenance personnel are eager to buy cheap refrigerants on the market. Cheap refrigerants may be fake refrigerants. It is not ruled out that mixed methane, R40 and other highly combustible substances may increase the possibility of system combustion and explosion.

4. Recognition method of inferior refrigerant or fake refrigerant:

Operation method: After one hour in the saturated state, the corresponding relationship between the pressure of the refrigerant tank and the ambient temperature It is qualified if it is within the range of ±0.2MPa. If it is out of this range, it is fake or inferior refrigerant. Please refer to the figure below for the saturation pressure gauge.

Attach: Inferior or fake refrigerant identification method-r410a

Attach inferior or fake refrigerant identification method-R32

Shut down for 10 minutes, then observe If the static pressure is lower than the value in the comparison table, it indicates that the system refrigerant is less than 30%. At this time, it is strictly forbidden to start up and repair, and all the system refrigerant must be discharged before entering the next step.

Example: R32 product. Indoor 30℃, outdoor 35℃, the static pressure at this time is subject to the indoor temperature. When the gauge pressure is <1.40MPa, it indicates that the system has air and there is a safety hazard. The refrigerant must be discharged after repairing and welding.

Seven. Summary of maintenance precautions

1. Do not use to buy inferior refrigerants or fake refrigerants (fake refrigerants may be mixed with methane , R40 and other highly combustible substances, the system will produce combustion and explosion possibilities).

2. Don’t use wrong refrigerants (mixed or misused refrigerants of different working fluids).

3. Standardized operations during installation and maintenance (to avoid leakage and air intake in each operation).

4. For R32 products, it is forbidden to have a heat source within 2 meters of maintenance and discharge of refrigerant, and must be vacuumed.

5. It is strictly forbidden to start operation when the system is blocked (the valve is not opened or the indoor unit is not connected to operate).

6. Ensure sufficient safety distance for maintenance welding. Brand welding tools are used, pressure vessels must have tempering devices, and welding must be done with nitrogen-filling protection and standardized operations.

7. For poor refrigeration effects and irregular failures (the compressor can work), first determine whether the static pressure is within a safe range and then operate according to the regulations.

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