It is recommended not to exceed 25 meters, when the refrigerant connection pipe of 5 air conditioners is more than 25 meters, the effect is inevitable, and the important thing is to prevent burning out the compressor. It can also be connected to 15 meters, which requires welding of copper pipes and charging a small amount of refrigerant.
The drainage pipe with the sample is also to be lengthened, and some drainage pipes are bought and wrapped with waterproof tape after being connected, so it is safer.