Charging Irrigation System, Can I Do This Myself?
Does someone come out and "close" your sprinkler system for the winter?  I don't know much about lawn sprinkler systems, but "charging" sounds similar to opening a swimming pool.  Every fall, I drain all the water out of the lines for the pool and plug them so the water doesn't freeze and crack the lines.  In the spring, I then remove the plugs and prime the pump to get water back in the lines.  I would expect a similar procedure for a sprinkler system in a climate where freezing is a probability.