Joined
·
12,316 Posts
Usually you just start filling, whether you are using 12 oz cans or a 30-lb cylinder. If using cans, the compressor will usually kick on after the first can.
If it doesn't kick on, and the can is not emptying because the pressure is the same inside the system as the can, you can place the can in a little bucket of hot tap water (about 120F, not hotter) to build can pressure and force it out.
If that fails, you can jumper a paper clip across the plug for the low-pressure cutoff switch. However, don't do that until some freon is in the system, and don't forget to remove the clip and plug the switch back in as soon as the compressor can cycle on its own.
If you're about to fill, that means you drew and held a vacuum of about 29 inches that held for at least 10 minutes, and then you drew a vacuum for another hour, right?
If it doesn't kick on, and the can is not emptying because the pressure is the same inside the system as the can, you can place the can in a little bucket of hot tap water (about 120F, not hotter) to build can pressure and force it out.
If that fails, you can jumper a paper clip across the plug for the low-pressure cutoff switch. However, don't do that until some freon is in the system, and don't forget to remove the clip and plug the switch back in as soon as the compressor can cycle on its own.
If you're about to fill, that means you drew and held a vacuum of about 29 inches that held for at least 10 minutes, and then you drew a vacuum for another hour, right?