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Thread: COR-20 Advanced

  1. #1
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    COR-20 Advanced

    I have a COR-20 as my return pump, I’ve had it in place for about 6 weeks, I set it at 80% and have a flow sensor on the line, over the past 3-4 weeks I’ve seen a gradual increase in flow, started at around 540gph, it’s now at 620gph.

    I keep having to play with the overflow valve to adjust for the increase in flow, I’m wondering if there’s a way for the pump and the flow sensor to work together to adjust the pump speed to give a steady 600gph? This way, I may save some watts, but mainly, I wouldn’t have to keep messing with the overflow valve?

    Anyone done this or have any idea if it’s possible?


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  2. #2
    Frequent Contributor zombie's Avatar
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    There will be some steady state error, but the basic method is this

    Set 70
    If Flow < 620 Then 70
    If Flow < 610 Then 75
    If Flow < 600 Then 80
    If Flow < 590 Then 85
    If Flow < 580 Then 90
    (Other code)

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  3. #3
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    Was going to implement this code today, I've made a few adjustments to make the windows a bit bigger and also another couple of lines to manage situations where the flow gets all out of shape.

    Fallback 80
    Set 85
    If Return > 640 Then 60
    If Return > 620 Then 70
    If Return < 619 Then 75
    If Return < 600 Then 80
    If Return < 580 Then 88
    If Return < 550 Then 90

    Can I add a min time or defer at the end that keeps the COR in a setting for at least 5 minutes or even more time, just dont want the pump to be jumping around all the time as the flow can vary so much. Would I have to add Min Time at the end of each line? Or is there a blanket that would cover them all?

  4. #4
    Frequent Contributor zombie's Avatar
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    Quote Originally Posted by Iufan View Post
    Was going to implement this code today, I've made a few adjustments to make the windows a bit bigger and also another couple of lines to manage situations where the flow gets all out of shape.

    Fallback 80
    Set 85
    If Return > 640 Then 60
    If Return > 620 Then 70
    If Return < 619 Then 75
    If Return < 600 Then 80
    If Return < 580 Then 88
    If Return < 550 Then 90

    Can I add a min time or defer at the end that keeps the COR in a setting for at least 5 minutes or even more time, just dont want the pump to be jumping around all the time as the flow can vary so much. Would I have to add Min Time at the end of each line? Or is there a blanket that would cover them all?
    Min times and defers only work directly with ON/OFF states. If you want to add defers and min times, you would need to separate all the flow statements into virtual outlets, and even then it would only defer in one direction, either increase or decrease not both. If you find that the flow jumps around too much and wont settle, you need to narrow your percent bands.

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