Grundfos CU301 controller & diaphragm tank


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Old 08-08-22, 06:59 AM
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Grundfos CU301 controller & diaphragm tank

Hoping someone can help clarify the following for me...

Grundfos CU301 controller (set to maintain 70 psi)
JetRite2 4.5gl diaphragm tank
Inline pressure gauge (cycles between 60 psi - 80 psi on demand; holds at 70 psi no demand)

I've always thought the bladder tank pressure should be set to -2 psi below the low pump turn (this would be 58 psi). In reading the CU301 user manual my understanding is that the diaphragm tank needs to be set at 70% of constant pressure. I'm I interpreting this correctly to be 70 psi x 0.70 = ~50 psi? Trying to figure out whether the tank pressure should be set to 50 or 58 psi (system pressure ranges 60-80 and holds at 70). Snipit of the user manual below. Thanks in advance!




 
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Old 08-08-22, 07:03 AM
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Follow the manufacturer's instructions. The 2psi less recommendation is often used on home water systems with a much larger pressure tank. Your setup may have different requirements with such a small tank.
 
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Old 08-08-22, 10:55 AM
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Sound advice. Thank you.
 
 

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