Freon I have a janitrol the units says its low on freon but when they try to add it............it won't take the freon can you tell me what it can be

Were you using just a charge hose or a set of gauges?
Using gauges you can see what the low side and high side pressures are. You will be able to tell if the pressure valve has opened in order for you to add freon.
With the A/C on the low side should read between 15 psi and 50 psi.. High side 100 psi-250 psi. Add freon to the low side port. If low side drops into a vacuum, you may have a plugged expansion valve .

Window units do not come with service ports. You can buy them at local parts houses, but unless you have the freon, not gonna do you any good. Window ac use either r22 our 410a, and that cannot be bout without being certified.

The compressor needs to be running.Also you need freon charging guages and a pressure temp chart to tell how much you need to add.
If your not sure of anything i said here have a service person do this.You take a risk of damaging the unit and yourself.

There are 2 valves, a high and low. R134 should be charged on the high side (bigger fitting of the 2). If your system has no refrigerant in it then you may have a bigger problem than low freon like a leak.

When you charge it the air condition settings should be on high and running. This will help with the vacuum you need to charge it. There is a good chance the clutch is out on the a/c, if it the level is low it will make a clicking sound when engaged, if the level is too low it won't move at all. If this is the case you will need to add oil as well as refrigerant (this comes as a mixture, read the label on the can and it will tell you if it has oil in it).

After turning on the car, run the a/c on high, use the correct fitting and try adding the freon again, if it still won't take it then you'll have to get it serviced, most likely the air compressor is out.

Generally, no. It's not normally a DIY project. Unless you have all the equipment (evaporator pump to remove and capture any freon (Now,R14) that's still in the unit, The high and low pressure gauges, etc). It's best left to the pros, as the unit may not be low on R14 gas. It may very well be a condensing sensor that has failed. Kent, there are a few times, when it's best left to the pros. And this is one of them. Especially, since yours is a 220 unit.

Hope I was able to help you. Please let me know. Thanks.

Hello, you can add freon by installing a piercing valve on the low side of the system. Before adding freon I would check and make sure the air filter and both coils are clean. If everything is clean then most likey the unit has a leak and is low on freon.

If a AC unit starts to freeze up, then that is a sure sign that it is low on freon. A wall unit is harder to add freon to since those units generally do not have Shrader valves to purge or add freon. It is sort of like your refridgerator in that the freon is sealed in the factory and to add , a technician has to cut the evaporator tube and add a valve, then add freon, pinch the tube off and seal it once the correct pressure is adjusted.

I would say that somehow your unit has developed a leak, and will get worse.

see:http://real-estate-agents.com/tips/hvac/maintain-air-conditioner/

Get a freon charger with a guage and make sure the unit is at the right pressure when running. If the unit starts and then stops you usually need to add freon because the compressor is running dry because the charge cant keep up with demand.

Add freon slowly and be sure the ac is on. A small puff....and wait to see if compressor comes on. When it does you can add until the guage reads in range. Try to keep it in the mid to lower end of the range. Believe it or not the fuller units dont run as cool!

Be careful! Adding freon too fast to a compressor can cause "slugging" and can damage the system!

The large line connected to the condensing unit wouldn't try add freon unless you know what you are doing get a licensed tec. could tell you how but it will cost $. Tom

can't tell exactly, too many variables, your low side pressure should be about 50 - 60 lbs, ( this is merely a guide ) temperature affects this reading. a simple way to tell is add freon and watch you indoor coil if possible. when the entire coil is sweating you are full. if only partial sweat is visible add more, a little at a time, it takes several minutes for this to circulate.