OpenSprinkler Forums OpenSprinkler Unified Firmware A couple of Master questions

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    Quote Ray 9/1/2012 “I am changing the master valve control to a per-program basis. So each program (containing a subset of stations) can independently set whether the master valve should turn on or not.”

    I have a split system, some valves are run through a master and some are not. Is the described functionality in Firmware 2.1, or is there some other way to not have the Master apply to all valves?

    Based on the manual it appears the that Master cannot be set to open before the downstream valves, is that correct? I’m pretty sure my current controller turns on the master first, which makes some sense because the values need pressure to operate correctly.





    The firmware has never supported master valve operation on a per-program basis — it has always been on a per-valve basis. What you quoted is from an early post and that has never been implemented.

    In any case, you can set master operation flag for each station/valve individually. Check the firmware tutorial video, or the user manual for details.

    You are right that the master cannot be set to open before other valves. Usually turning on valve is not a problem, and the valve doesn’t require pressure to turn on. In fact, having the master valve on before other valves turn on can produce water throttling issues. Turning off valve, on the other hand, does require certain water pressure. This is how typical sprinkler valves work. If you do want to turn on master before other valves, here is a workaround:
    1. create a dummy station, and make sure this is the first non-master station
    2. set the dummy station to activate master
    3. in your program, set the dummy station to run for whatever time you need
    Since the dummy station doesn’t actually turn on any valve, this basically achieves turning on master before any (real) valve turns on.


    Great! Thanks again Ray.

    I have a well so not a lot of pressure to play with. The Champion definitely does Master first, but I agree it’s the “off” that is pressure critical. Hopefully zero delay will be fine, but if not the workaround will do it so either way it’s all good 🙂


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OpenSprinkler Forums OpenSprinkler Unified Firmware A couple of Master questions