[DIY] Installation of room air conditioner 2nd floor → 1st floor makeup cover 

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This time, we will install a "room air conditioner" in the children's room on the 2nd floor of our house by DIY. Since we need multiple special tools to install the air conditioner, we can rent tools.
0:40
The indoor unit and the outdoor unit are connected by a "refrigerant pipe" and "electrical wiring", and a "drain hose" that drains the condensed water of the indoor unit is passed through the outside.
1:20
Make a small hole to make sure there are no obstacles. If you make a hole in a pillar or brace, the strength of the house will decrease, so work carefully.
2:09
Since the wall material is "plaster board", it is not strong enough to be attached with screws, so use "board anchor".
2:41
Check the attached dimensional drawing to make sure there is no contact with the wall.
3:16
Since the material of the outer wall is "concrete", it is necessary to apply vibration at the same time as rotation when making a hole, use a "rotary hammer drill".
3:42
The inside of the wall is lined with "heat insulating material", and a "sleeve" is inserted to insulate it.
Mice can bite insulation and wires and need to be protected.
3:57
When removing the room air conditioner, it is necessary to fill the outdoor unit with the "refrigerant gas" in the piping. This work is called "pump down". It's easy to do, so you don't need any special tools to remove it.
3:59
"Silicon sealant" is applied to the gaps between each part to prevent rain from entering.
4:46
Insulate the piping to prevent "condensation" on the refrigerant pipe.
4:50
Place the drain hose down to create a "water gradient".
4:58
Close the gap with "flame-retardant putty" to prevent the intrusion of outside air.
5:15
Use a "pipe cutter" to cut the pipe to just the right length. Cut the pipe little by little while turning it.
5:23
Use a "reamer" to remove burrs from the pipe, and any burrs left may cause a "gas leak".
5:36
Use the "flare tool" to flare the pipe. Insert the pipe to the length of the guide and perform flaring.
5:54
When the drain hose is on the ground, insects will come in and float in the air. Attach a cap to prevent insects from invading.
6:07
Apply the gas leak preventive agent "Nylog".
6:13
Fix the piping with the specified strength with a "torque wrench".
6:16
A gauge is attached to the service port to fill gas and "evacuate". If there is air in the piping, it may cause the "compressor" to malfunction.
We connected the "vacuum pump" and performed "vacuum drawing" for about 20 minutes, which eliminates the moisture and air in the piping.
6:27
Twenty minutes have passed since the vacuum pump was removed, and the inside of the pipe is "maintaining a vacuum." Flaring is good and we are testing for gas leaks.
6:33
"Refrigerant gas" is opened in the pipe. Immediately after this, the pipe becomes "high pressure" and the indoor unit and outdoor unit are connected.
Use the "leak checker" and check again that there are no gas leaks. If there is a gas leak, bubbles will appear to let you know.
If a gas leaks, the "cooling function" and "heating function" will be lost.
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Please note that a "dedicated circuit" is recommended for room air conditioners due to the large amount of power used. Please note that a "class 2 electrician qualification" is required to create a dedicated circuit.
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#Details in the summary section
#DIY
#Air conditioner construction

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