This is one machine with multiple libraries, do you understand?

This is one machine with multiple libraries, do you understand? The owner replaced a new air conditioner, the master installed it in less than half an hour, and the air conditioner was evacuated in 5 minutes. Is this newly installed air conditioner really evacuated? The manual clearly states that the air conditioner must be evacuated for at least 15 minutes to ensure that the air in the air conditioner tube is completely evacuated. Otherwise, the cooling and heating performance of the air conditioner will deteriorate, the energy consumption will become higher, and the electricity cost will become more and more expensive! This is 10 minutes less than the vacuum of the air conditioner. The installer pointed out that in fact, it does not have to be full for 15 minutes, as long as it shows negative pressure on the meter. Besides, I used a 2L vacuum pump, which is faster than 5 minutes. The owner was still a little uneasy, so he consulted a household appliance repairman in the community. He pointed out that the length of time for the air conditioner to evacuate was variable, as long as the vacuum degree in the air conditioner pipe reached 10Pa or less. The time for the air conditioner to evacuate mainly depends on the length and thickness of the air conditioner pipes, the number of horses and the size of the vacuum pump. The longer the pipes connected to the internal and external units of the air conditioner, the longer the vacuum time. The larger the vacuum pump used by the installer, the shorter the vacuum time. How do you know that the air conditioner has been evacuated? Usually, the master will use a special pressure gauge when installing the air conditioner for vacuuming. Observe the pressure gauge, and the pointer moves to a negative number to indicate that the air conditioner has been vacuumed. But don't rush to pull out the tube at this time, but wait for 15~30 minutes, and then observe whether the pointer returns to a positive number. If there is no change, then pull out the tube to prevent it from being cleaned. The owner also took a look at the pressure gauge of my master's vacuum pump. The pointer was still positive. When the master was lazy and did not clean it, how can I remedy this? Can I draw a second time? Yes, but first you need to release all the refrigerant in the air-conditioning pipeline. Secondly, the evacuation time should be extended, at least about 30 minutes. You must evacuate all the remaining refrigerant in the pipeline, otherwise the air-conditioning will be evacuated in vain. Big pile. All in all, most air conditioners need 15~30 minutes to evacuate. Of course, not only the time, but also the pressure gauge. Because of the long time, some masters will laze and take a few minutes to finish.

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