How do you refill the gas in an air conditioning unit?

Answer 1

You do not have the safety systems or certifications to access the freon and do this. Leave it to a professional. If the unit is leaking, you need to replace the coil, perhaps, and will have to use a professional to service it.

Answer 2

You have to have a manifold guage set. You have to purge the lines of all air before introducing gas in to the system. This is how you add to a system that is a little low. If your system is low you are technically required to find and fix the leak.

If the leak can be repaired without recovering the refrigerant then you can top it off like this:

The unit has to be running.

Put the blue hose on the suction line service valve at the outdoor unit (cold bigger line).

Hook the yellow hose to the tank with the tank valve closed.

You should be reading the system low side pressure now.

Open the left hand valve on the manifold guage set.

Slowly unscrew the yellow hose fitting from the tank until you hear gas coming out. Don't take it off. Just let the gas escape through the threds and that will purge the air. Do it for 10 seconds or so. Air is now purged. Tighten the yellow hose fitting back to the tank.

Close the left hand valve and open the valve on the tank. Tank should be in the upright position for charging with vapor (liquid charging is faster, but that's better left for a pro).

Now slowly open the left hand valve on the manifold guage to allow the gas to enter the refrigerant suction line.

On an R22 system you should have about 70psi. That equals about 40° in saturated refrigerant temperature. Pressure alone is not the only factor in charging through the low side.

Remeber there is a lot more to properly charging an air conditioning system. I have just explained how to add gas. I can't write a book on how to properly check the charge.

Opening a refrigeration or air conditioning system can be dangerous. People can make serious mistakes that can damage the equipment or cause injury. I do not recommend any person add charge to a refrigeration system without the assistance of a professional mechanic who is certified with the EPA

Answer 3

Depends on the unit, some. Most will have a tap that fits a kit you can buy at your home center. If it's older, you cannot legally do this yourself. You will have to pay to have any remaining freon removed, then have it replaced with the new stuff they use now. You can do it, if you can find the freon. It's not difficult to just refill it. The question is why does it need filled. this problem should be addressed. Some units won't have a refill valve made into them. Then it's a pain, and you really should let a pro put one in.

Answer 4

I honestly believe there are refill kits with the instructions attached, some are throw away units you can't refill them you could contact the company to find out for sure.

Answer 5

You look in the yellow pages under air conditioning contractors and call someone. I watched the guy do ours and he has some kind of gizmo that he puts it in with that regulates the presser. If you do it, you could mess something up and that will cost more in the long run.

Answer 6

you need to get an hvac technician to recharge the system. you cannot just open the system and try to put in more gas because it will allow the gas already in the system to escape into the ozone.

it may just be more cost efficient to get a new unit, but get an estimate first.

good luck

Answer 7

Very carefully.
For starters you should be licensed to do it and the proper tools/equipment. Not to mention you need a license to buy the correct freon for the unit.

Answer 8

easy put some more in

Answer 9

not sure