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Old 02-17-2010, 04:39 AM   #1
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VSD pump with accumulator tank?

I'm putting in a VSD (variable speed) FW pump to replace my old diapharagm type. I know it doesn't need an accumulator tank, but would it hurt to leave one in the circuit? I'm worried about expansion in the hot water tank. If I take the accumulator tank out and put in a check valve, the hot water will dribble out the pressure relief valve on the HW heater.

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Old 02-17-2010, 03:32 PM   #2
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RE: VSD pump with accumulator tank?

Kinda sounds to me like you need a new relief valve.

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Old 02-18-2010, 07:33 AM   #3
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RE: VSD pump with accumulator tank?

I changed from diaphragm type to impeller type years ago, without taking out the accumulator tank. when the accumulator failed I got a new one, as the pump cycles so much less with it. Now any overnight water usage (less than an accumulator full) willl not wake other sleepers.
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Old 02-19-2010, 03:28 AM   #4
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RE: VSD pump with accumulator tank?

The accumulator will be useful with the new pump.

The HW heater will stop dribeling with a place for the pressure to go.

The FW pump will also stop "softer" , which will extend its life.

AS an Offshore thinking guy (even tho we don't get there often enough ) I prefer to Hard Mount the FW pump, so I hear it run , esp at night .

Blowing the FW tank doesn't matter much on inshore cruises , but old habits die hard.

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