Thanks very much, BTanner! I very much appreciate your time in answering my post. Very interesting lesson - The entire clock/Hz issue was completely new to me! I installed the electro-mechanical system (RainBird RC7-C) on Sunday, and it both ran fine and seems to be keeping good time so far! Best Regards. Larry
Boy I wish I had access to a page like this when I first installed my system! Thanks to all for your time in helping us less experienced folks. I previously installed a Toro exterior 8 zone timer, and I constantly had to reset the clock. It seemed to get way off-time every time it ran through the cycle. The clock was OK on non-watering days. Tech support at Toro didn't seem to know what to think about it at first, but then told me that it was due to the location being too close to the pump start...
