Re: [Amel Yacht Owners] fresh water pump and pressure
Udo <udo@...>
I have switched our pump out to the Jabsco. I have to check which size
but believe it is the one you are mentioning. This higher pressure pump is really nice and functions well but has led to several leeks in the system that I had to trouble shoot. Most of it was tightening or replacing hose clamps. One issue involved changing out the original master shower valve since the pressure caused it to continuously drip. (We have a conventional shower head, rather than the push button one). Overall no big deal. The only other thing is that the control light next to the water pump breaker is now continuously lit when the breaker is on. With the old pump the light only came on when the pump was running. Udo, SM #50 ________________________________ From: amelyachtowners@yahoogroups.com [mailto:amelyachtowners@yahoogroups.com] On Behalf Of markmpitt Sent: Friday, January 11, 2008 11:30 AM To: amelyachtowners@yahoogroups.com Subject: [Amel Yacht Owners] fresh water pump and pressure I am considering replacing the fresh water pump, accumulator tank, and pressure switch on my ASM with one of the new variable speed pumps from Jabsco that do not require a separate accumulator tank or pressure switch. My current pump is the big 40 liter per minute (10.6 gallons per minute)AMFA A88B that delivers up to 29 psi (2.0 bars). This is the optional pump intended to supply plenty of water to the optional hose outlet under the helm seat. The pump and the pressure switch have been giving me problems. Jabsco has a new 29 liter per minute (7.5 gallons per minute) variable speed pump,the Jabsco 7.5 VSD (part 41755-0094 for the 24 v model) that probably delivers enough water for my needs as I almost never use the hose outlet. It self-primes to 1.8 meters versus 5.5 meters for the AMFA A88B (and the ASM standard A66B), and can run dry. It's pressure shut-off is 50 psi, which is significantly higher than the 29 psi of the AMFA. Has anyone had any experience with a variable speed pump before in an Amel or any other vessel? Is the higher cutout pressure of 50 psi a problem? It seems that 40 psi is quite common on smaller, switched pumps. Shurflo has a variable speed pump, the Extreme Smart Sensor 5.7 that delivers 21.6 liters per minute with a shut-off pressure of 65 psi. I do not know why variable speed pumps have a higher shut-off pressure or whether this is a concern in an ASM. Any enlightenment would be appreciated. The specs of the AMFA pumps are found at http://www.reya.com/English/framespumps.htm <http://www.reya.com/English/framespumps.htm> and the Jabsco at http://www.jabsco.com/files/marine_product_guide_2006.pdf. <http://www.jabsco.com/files/marine_product_guide_2006.pdf.> Mark Pitt Sabbatical III ASM #419
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