Winterize Sprinkler System - Febco Backflow

I know this subject has been talked about at great length in these forums/groups. But I still do not have a good answer to my question.
I am planning on blowing out my own sprinklers this year. Looking through all the forums and instructions I can find on the subject, I have found conflicting advice. Some sources say DO NOT blow out through the "Testcocks". So, this leads me to my question... where do I hook the compressor line to?
Here is an image of my valve: www.sacreativeservices.com/forum_stuff/febco.jpg
Do I hook to A? B? or C? it seem like C is a bleeder valve of sorts.
Can someone give me a little advice please?
Thanks,
SA
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Scott wrote:

I observed mine getting blown today. My setup is similar to yours without "C". The company who installed the sprinkler system did the work. They used "A" to blow the sprinkler lines, and "B" to blow the supply line back inside the house with the drain opened inside, and the supply valve shut.
lionel
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Take the picture, omit A and B, and install a hose bib valve instead of C. That's what ours is.
To blow the lines, I close the valve inside the house, and connect the airline to the hose bib. I manually open each zone valve in turn, and blow the segment out thru the sprinkler heads.
Once done, I remove the airline, and let any water remaining in the feed line drain out the hose bib.
Done.
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My old system (I don't have one in my current home) had a hose bib on the setup like you show. They just hooked the line to that, after closing the valve inside the house...
-Tim
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What you could do in the future is sweat in a hose bib after the breaker,after the shut-off valve so you can blow it through there, so you don't risk losing any air pressure through the breaker.
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Thanks for the replies... So, if I use "A", will it damage anything?
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I installed a valve in my sprinkler system shortly past where it connects to the house water supply. This valve allows me to hook up and blow out the entire system. You might consider doing a bit of plumbing if you don't have a spot to hook on an airline.

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