Co2 scrubber motorized ball valve programming help

[fattiremike]

Good morning,

I purchased a motorized ball valve to control the ph by opening and closing, bypassing the scrubber. I am using the Apex 2016 and the valve is plugged in to the EB832. I don't want to wear the motor out prematurely, so I would like the ball valve to open at 8.30, and close at 8.25. This is a normally closed valve, meaning (I think) that when the power is off, the valve is closed. Here is the programming that I came up with:

Fallback OFF
Set ON
If pH > 8.30 Then ON
If pH < 8.25 Then OFF

That programming does not seem to work, as the valve is cycling like crazy according to the logs. It seems to be triggered by the last line of code. I would appreciate any help.

Thanks,

Mike

 

[RussM Verified Sponsor]

Delete the Set statement.

Then, please read this sticky post to gain a better understanding of when and when not to use a Set statement.

Read This First! New APEX Users: Read This Thread!

I am a long-time owner of Neptune Systems' products, and have been helping fellow controller owners in various Internet forums for many years. Some of you may have noticed that I spend A LOT of time doing so :) In all those years, I've seen patterns of things that people sometimes do which...

forum.neptunesystems.com

 

[fattiremike]

Delete the Set statement.

Then, please read this sticky post to gain a better understanding of when and when not to use a Set statement.

Read This First! New APEX Users: Read This Thread!

I am a long-time owner of Neptune Systems' products, and have been helping fellow controller owners in various Internet forums for many years. Some of you may have noticed that I spend A LOT of time doing so :) In all those years, I've seen patterns of things that people sometimes do which...

forum.neptunesystems.com

Thanks.