Question about Whirlwind FH-778 Air Conditioner

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I am replacing my central A C. with a new one. I worked on Autos for 50 yrs. have guages. Do I Screw the Allen Plug in on the high side, run the compressor, then screw in the low side. to keep the r-22 in the condenser, and desolder the lines.

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By George, you've got it.Front seat (screw in) the high side and run the unit. Do not let it pull into a vacuum as this will allow air to be sucked into the system when you open it. Also, watch you high side gage. Don't go over 400 psi. This is usually the High pressure cut out setting on most safeties. Pull low side to about 2-3 psi and kill unit. Let sit for about 5 minutes and then run it again back down to 2-3 psi. Front seat the low side any you should be good to go.
I strongly suggest that you add a filter/dryer to the system. It's good practice to do so once the system has been open. If you are going back with a 410-a system, don't leave it open to the atmosphere for more than 15 minutes. That is, the condensing unit. The only way to remove moisture from the oil on this system is to use filter/dryers. You can not vacuum it out like in the old days with R-12.

Good luck and hope this is what you are looking for.

Posted on Jun 27, 2009

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