Unusual well pump pressure switch setup?
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kelchm
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Is there any existing documentation out there on how to correctly set the on/off pressures of each switch in this type of configuration? Does the secondary switch simply need to have it's on/off pressures set lower/higher than the primary?
As an example, if the primary was set to turn on at 30PSI and off at 50PSI, would you want the secondary to be set to turn on at something like 25PSI and off at 55PSI?
It seems to me that this type of configuration would only handle a failure where the primary fails closed (IE: pump turned on). Is the intention simply to prevent damage to the pump/pipes if the primary switch were to fail closed? Lastly, does the order matter here (IE, which is the 'primary' vs which is the 'secondary')?
As an example, if the primary was set to turn on at 30PSI and off at 50PSI, would you want the secondary to be set to turn on at something like 25PSI and off at 55PSI?
It seems to me that this type of configuration would only handle a failure where the primary fails closed (IE: pump turned on). Is the intention simply to prevent damage to the pump/pipes if the primary switch were to fail closed? Lastly, does the order matter here (IE, which is the 'primary' vs which is the 'secondary')?
The second switch could also be a reverse acting switch used as a low pressure kill. They make single switches with that feature built in, so the second switch is not needed. Plus if one switch fails, there is a good possibility the second switch will also. Instead of a second switch just for high pressure protection, I prefer a simple pressure relief valve.
It could go that way. It could also be that the two switches are set the same. Since this is not commonly done, I don't think there is a common way to do it. Yet this redundancy makes sense to me.
To adjust one or the other, usually you leave the nut on the small spring alone if you want a 20 psi differential. Then the nut on the big spring adjusts both cut in and cut out.
You could shunt around the contacts on one, and adjust the other.
Is your pump 230 volt, or 115 volt? I suspect 230, in which case, your white wires should be marked.
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