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Old 19-05-2011, 11:34   #1
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Diaphragm Pressure Tank

Have a 5 gal diaphragm pressure tank on our Mainship 430. Anyone know what the air pressure should be?
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Old 19-05-2011, 12:11   #2
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Re: Diaphragm pressure tank

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Originally Posted by jbello View Post
Have a 5 gal diaphragm pressure tank on our Mainship 430. Anyone know what the air pressure should be?
To test the accumulator minimum tank pressure should be set at 20 PSI with the pump "off" and one cold and one hot fixture open. 40-50 PSI is okay as long as it doesn't exceed 100 PSI.
IE, The most efficient use of the accumulator occurs with the precharge pressure set at the SAME pressure as the pumps' pressure switch "turn ON" setting.Typically, a 40 psi [2.7 bar] pump will "turn ON" at 20 psi [1.4 bar]. Therefore, the precharge should also be 20 psi [1.4 bar]. The precharge must be set in a "static" condition (pump off and at least one water fixture opened to atmosphere).

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Old 19-05-2011, 12:25   #3
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Re: Diaphragm pressure tank

Greetings and welcome aboard the CF, jbello.

What Seahunter said.
http://legacy.shurflo.com/pages/Food.../911-378-P.pdf
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