Quote:
Originally Posted by warlock
Thanks guys, let me see how the vacuum test goes. I've got a 1.5 cfm pump I can borrow, would that be sufficient? Also, when I switch the yellow hose from the R134 can to the pump (and then back again if I have to refill) how do I avoid getting air back in the yellow hose?
|
You can try that and see how low you can get on the low side gauge. If you can get it down to at least -29 in.Hg, it should do the job but the question is ho long it will take. You will need at least a 10 cfm vacuum pump.
1. Hook up the yellow hose to the vacuum pump.
2. Hook up the red hose on the high side port on the compressor.
3. Hook up the blue hose on the low side port.
4. Do not turn on the vacuum pump yet. Check vacuum pump oil level.
5. Read the system low and high pressure.
6. If standing pressures are still above 70 psi. You may need to recover. Or just release it to atmosphere but not advisable.
7. If pressures are below 5 psi, you can start evacuation
8. Turn On vacuum pump
9. Open low side knob on manifold slowly. (CCW)
10. Open high side knob on manifold slowly.
11. Let the pump run until deep vacuum is reached. Let it run another 1 hour.
12. Close the manifold low and high side knobs. (CW)
13. Turn off the pump
14. Let it sit for a few hours and observe the low side gauge for loss of vacuum
15. If system holds vacuum, remove yellow hose from vacuum pump
16. Hook the yellow hose to the R134A can.
17. Open the can charging valve.
18. Loosen the yellow hose fitting on the bottom of the manifold gauge slowly to purge the air inside the hose from the can to the gauges. tighten the fitting back. The hose is already purged and filled with R134A
19. You can start charging on the low side if you are a beginner.