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[Amel] Fresh Water Pump
Richard Piller <richard03801@...>
Hi we simply changed to a 24 v on demand pump at 40psi from Shorflow problem solved. Got rid of the pesky tank too.
Regards
Capt Richard Piller
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Regards
Capt Richard Piller
On Jul 30, 2013, at 2:33, Ian Shepherd <sv_freespirit@...> wrote:
I have an A.M.F.A A88 fresh water pump with the bronze impeller. The
pump struggles to reach cut off pressure after an overnight discharge of
the batteries down to around 24.0 V. The Square D pressure switch was
replaced about a year ago and adjustment cannot cure the problem. A
couple of times now I have forgotten to trip the pump CB last thing at
night leading to a massive discharge of the batteries after the pump
failed to reach cut off pressure.
Looking at the impeller there does not seem much that can wear, but
maybe changing it will result in more pressure? Has anyone replaced this
impeller with a noticeable improvement please?
Ian Shepherd SM2000 #414 Crusader Built Jul 2003 Thassos Greece
Judy and Bill aboard SV BeBe <yahoogroups@...>
Ian,
That Square D pressure switch is really tricky to get adjusted correctly, but when you get it right it, it along with the pump Amel installed is so much better than any on-demand pump on the market anywhere.
There are two adjustments to the Square D switch. The center nut adjustment is for the cut-on pressure...be sure to adjust it first...and to back off of the other nut adjustment about 2 -3 turns before you adjust the center cut-on pressure nut.
When you are satisfied with the cut-on pressure adjustment, adjust the 2nd adjustment nut...this is the duration-on adjustment. For instance, it is too loose if the pump turns on as soon as you turn on water flow and off when you turn off water flow. Screw the nut clockwise to increase the duration...increasing duration pressurizes the accumulator tanks. BTW, the accumulator tank air pressure should be slightly less than your pressurized fresh water system pressure. If the pressurized fresh water system pressure is 40psi, the tank should be 30-34psi. Only check the accumulator tank air pressure with the fresh water system depressurized.
Don't get discouraged if you have to do this several times to get it where you want it...and because the switch is mechanical, it may require adjustment again. The process is fresh in my mind because after being off BeBe for 6 months, I had to go through the process.
I hope this helps.
Bill (Admiral, Texas Navy, Current Governor's Commission...I wish Texas had ships, but they would have to be Amels)
BeBe, SM2k #387
Currently Fethiye, Turkey
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That Square D pressure switch is really tricky to get adjusted correctly, but when you get it right it, it along with the pump Amel installed is so much better than any on-demand pump on the market anywhere.
There are two adjustments to the Square D switch. The center nut adjustment is for the cut-on pressure...be sure to adjust it first...and to back off of the other nut adjustment about 2 -3 turns before you adjust the center cut-on pressure nut.
When you are satisfied with the cut-on pressure adjustment, adjust the 2nd adjustment nut...this is the duration-on adjustment. For instance, it is too loose if the pump turns on as soon as you turn on water flow and off when you turn off water flow. Screw the nut clockwise to increase the duration...increasing duration pressurizes the accumulator tanks. BTW, the accumulator tank air pressure should be slightly less than your pressurized fresh water system pressure. If the pressurized fresh water system pressure is 40psi, the tank should be 30-34psi. Only check the accumulator tank air pressure with the fresh water system depressurized.
Don't get discouraged if you have to do this several times to get it where you want it...and because the switch is mechanical, it may require adjustment again. The process is fresh in my mind because after being off BeBe for 6 months, I had to go through the process.
I hope this helps.
Bill (Admiral, Texas Navy, Current Governor's Commission...I wish Texas had ships, but they would have to be Amels)
BeBe, SM2k #387
Currently Fethiye, Turkey
--- In amelyachtowners@..., Richard Piller <richard03801@...> wrote:
Hi we simply changed to a 24 v on demand pump at 40psi from Shorflow problem solved. Got rid of the pesky tank too.
Sent from my iPad
Regards
Capt Richard Piller
On Jul 30, 2013, at 2:33, Ian Shepherd <sv_freespirit@...> wrote:I have an A.M.F.A A88 fresh water pump with the bronze impeller. The
pump struggles to reach cut off pressure after an overnight discharge of
the batteries down to around 24.0 V. The Square D pressure switch was
replaced about a year ago and adjustment cannot cure the problem. A
couple of times now I have forgotten to trip the pump CB last thing at
night leading to a massive discharge of the batteries after the pump
failed to reach cut off pressure.
Looking at the impeller there does not seem much that can wear, but
maybe changing it will result in more pressure? Has anyone replaced this
impeller with a noticeable improvement please?
Ian Shepherd SM2000 #414 Crusader Built Jul 2003 Thassos Greece
[Non-text portions of this message have been removed]
Ian Shepherd
Sounds a good idea Richard. I have been through 4 pressure stats and
two accumulators, the latter costing as much as a new pump!
Cheers
Ian SM 414 Crusader
On 30/07/2013 10:16, Richard Piller wrote:
[Non-text portions of this message have been removed]
two accumulators, the latter costing as much as a new pump!
Cheers
Ian SM 414 Crusader
On 30/07/2013 10:16, Richard Piller wrote:
Hi we simply changed to a 24 v on demand pump at 40psi from Shorflow
problem solved. Got rid of the pesky tank too.
Sent from my iPad
Regards
Capt Richard Piller
On Jul 30, 2013, at 2:33, Ian Shepherd <sv_freespirit@...
<mailto:sv_freespirit%40yahoo.co.uk>> wrote:I have an A.M.F.A A88 fresh water pump with the bronze impeller. Thedischarge of
pump struggles to reach cut off pressure after an overnightthe batteries down to around 24.0 V. The Square D pressure switch wasthis
replaced about a year ago and adjustment cannot cure the problem. A
couple of times now I have forgotten to trip the pump CB last thing at
night leading to a massive discharge of the batteries after the pump
failed to reach cut off pressure.
Looking at the impeller there does not seem much that can wear, but
maybe changing it will result in more pressure? Has anyone replacedimpeller with a noticeable improvement please?[Non-text portions of this message have been removed]
Ian Shepherd SM2000 #414 Crusader Built Jul 2003 Thassos Greece
[Non-text portions of this message have been removed]
Ian Shepherd
Hi Bill,
good to hear from you and I hope you are getting ready to depart. I was
about to shoot you an email about various mods which I will do shortly.
Back to the pressure switch. You are right. They are finicky. I have
dismantled it and there was no dirt inside, which is what I would have
expected as the Square D is only a year old and I have never put tap
water in the tank. All water for the past 13 years has been RO and
should be particle free.
Your adjustment method tallies with mine. The second nut is slackened
right off so there is no spring tension at all. The pump still tries to
reach 2.8 Bar (42 psi) which is odd as out of the box it cuts out at 2.4
Bar. What I have not done is check the accumulator pressure. I will
measure it tomorrow. I am leaning towards an end of season change of
pump to eliminate the accumulator, the external pressure switch and the
rather poor way in which the pressure switch is threaded into the
manifold pipe without an adequate boss which is prone to leaking and
requires pipe and wiring to be removed in order to wrap yet more PTFE
tape around it.
Cheers to you and Judy
Ian SM 414 2003 Crusader
toggle quoted message
Show quoted text
good to hear from you and I hope you are getting ready to depart. I was
about to shoot you an email about various mods which I will do shortly.
Back to the pressure switch. You are right. They are finicky. I have
dismantled it and there was no dirt inside, which is what I would have
expected as the Square D is only a year old and I have never put tap
water in the tank. All water for the past 13 years has been RO and
should be particle free.
Your adjustment method tallies with mine. The second nut is slackened
right off so there is no spring tension at all. The pump still tries to
reach 2.8 Bar (42 psi) which is odd as out of the box it cuts out at 2.4
Bar. What I have not done is check the accumulator pressure. I will
measure it tomorrow. I am leaning towards an end of season change of
pump to eliminate the accumulator, the external pressure switch and the
rather poor way in which the pressure switch is threaded into the
manifold pipe without an adequate boss which is prone to leaking and
requires pipe and wiring to be removed in order to wrap yet more PTFE
tape around it.
Cheers to you and Judy
Ian SM 414 2003 Crusader
On 30/07/2013 13:15, Judy and Bill aboard SV BeBe wrote:
Ian,
That Square D pressure switch is really tricky to get adjusted
correctly, but when you get it right it, it along with the pump Amel
installed is so much better than any on-demand pump on the market
anywhere.
There are two adjustments to the Square D switch. The center nut
adjustment is for the cut-on pressure...be sure to adjust it
first...and to back off of the other nut adjustment about 2 -3 turns
before you adjust the center cut-on pressure nut.
When you are satisfied with the cut-on pressure adjustment, adjust the
2nd adjustment nut...this is the duration-on adjustment. For instance,
it is too loose if the pump turns on as soon as you turn on water flow
and off when you turn off water flow. Screw the nut clockwise to
increase the duration...increasing duration pressurizes the
accumulator tanks. BTW, the accumulator tank air pressure should be
slightly less than your pressurized fresh water system pressure. If
the pressurized fresh water system pressure is 40psi, the tank should
be 30-34psi. Only check the accumulator tank air pressure with the
fresh water system depressurized.
Don't get discouraged if you have to do this several times to get it
where you want it...and because the switch is mechanical, it may
require adjustment again. The process is fresh in my mind because
after being off BeBe for 6 months, I had to go through the process.
I hope this helps.
Bill (Admiral, Texas Navy, Current Governor's Commission...I wish
Texas had ships, but they would have to be Amels)
BeBe, SM2k #387
Currently Fethiye, Turkey
--- In amelyachtowners@...
<mailto:amelyachtowners%40yahoogroups.com>, Richard Piller
<richard03801@...> wrote:problem solved. Got rid of the pesky tank too.
Hi we simply changed to a 24 v on demand pump at 40psi from Shorflowdischarge of
Sent from my iPad
Regards
Capt Richard Piller
On Jul 30, 2013, at 2:33, Ian Shepherd <sv_freespirit@...> wrote:I have an A.M.F.A A88 fresh water pump with the bronze impeller. The
pump struggles to reach cut off pressure after an overnightthing atthe batteries down to around 24.0 V. The Square D pressure switch was
replaced about a year ago and adjustment cannot cure the problem. A
couple of times now I have forgotten to trip the pump CB lastreplaced thisnight leading to a massive discharge of the batteries after the pump
failed to reach cut off pressure.
Looking at the impeller there does not seem much that can wear, but
maybe changing it will result in more pressure? Has anyoneimpeller with a noticeable improvement please?
Ian Shepherd SM2000 #414 Crusader Built Jul 2003 Thassos Greece