Water pump (one more time)

[ac7880]

If you want another company to check out, check the Aquatec water
pumps. They are the same technology, and have a pressure adjustment
1/16 allen head. Counterclockwise lowers the pressure.

http://www.aquatec.com/
They have 60 PSI adjustable downwards, in 2 pumps, either a 3.5 GPM,
or a 5 GPM. I went 3.5 GPM for longer stays boondocking.
Dan
94 BB BMC 37'

--- In WanderlodgeForum@yahoogroups.com, Terry Neal wrote:
>
> Good to know David. I had asked Shurflo a week or so ago if there
was
> any kind of pressure adjustment on this model & they said "no, none
at
> all". I was going to order one but was thinking I should look at
other
> brands & see if something else had any kind of adjustment. Let us
know
> how your issue turns out.
>
> Terry Neal
> Bozeman, MT
> 82PT40 6V92TA
> 74FC34 6V53T
>
>
>
> David Brady wrote:
>
> > Just got off the phone with Shurflo. Apparently there is
> > an adjustment screw on the pump to adjust the internal
> > pump pressure regulator. I'll give it a try. Otherwise,
> > I may try a replacement pump. The behaviour is that the
> > pump ramps up too rapidly, overshoots, and ramps again.
> >
> > David B
> > '02 LXi, Smokey
> > NC
> >
> > David Brady wrote:
> > >
> > > I called Shurflo and they specified that the pump should have
> > > at least 18 inches of elbow free tubing both at the inlet and
> > > at the outlet. I have much more than that. I don't use any
strainer
> > > at all. All tank water is filtered as the tank is filled, so I'm
> > > thinking that the strainer isn't necessary. With the original
dual
> > > fuel pumps both used strainers, and the strainers were always
> > > spotless. To quiet the pump even further I mounted it using a
> > > Jabsco vibration pad kit, part number 43990-0058. These legs
> > > provide much more vibration dampening than the original
> > > Shurflo legs. The pump is virtually silent. I do have aquahot.
> > > What I experience, especially on hot water, is: as the hot water
> > > is turned on, the pump ramps up, stops, ramps up again, stops,
> > > and again. It may do this half a dozen times before it settles
down.
> > > In the shower, this turns in to variation in temperature. Since
the
> > > cold water pressure is fairly constant, the cold water flow
stays
> > > the same, but the hot water oscillates. The temperature varies
from
> > > say 115 deg F to 120 deg F every second or so. Very annoying.
> > > But then, after say half the fresh water tank is used up,
everything
> > > works properly. Maybe another call to Shurflo is in order.
> > >
> > > David B
> > > '02 LXi, Smokey
> > > NC
> > >
> > > Pete Masterson wrote:
> > > >
> > > > Reading the installation instructions with the pump, it
cautioned
> > > > about isolating it from vibration to the plumbing. My coach
has the
> > > > gray plastic pipe (polybutyl -- that's no longer used as it
was the
> > > > subject of class-action lawsuits in the late 90s due to
unexpected
> > > > failures in homes and manufactured homes). I purchased "Flare-
It"
> > > > fittings from PEX Connection along with a few feet of 3/4
inch I.D.
> > > > PEX tubing. PEX can be bent around corners so long as it has a
> > > > suitable bending circumference (which is a chore to
accomplish in the
> > > > space available for the pump). So, from the end of the
original
> > > > plumbing, I have a 3' section of PEX looped to turn 90
degrees to
> > > > enter the pump, which is mounted on one of the (apparently)
wooden
> > > > boards attached to a metal bulkhead where one of the original
dual
> > > > pumps was located. Again, on the outside, I have another
similar 3'
> > > > section of PEX with a large loop to connect to the outbound
original
> > > > plumbing. This effectively isolates the pump from transmitting
> > > > vibrations through the plumbing system. The PEX tubing is
(somewhat)
> > > > flexible and the dual curves allow
vibration/expansion/contraction as
> > > > necessary.
> > > >
> > > > The higher pressure did not cause any unexpected problems
with the
> > > > existing plumbing -- except the main fresh water drain valve
started
> > > > leaking from a long-existing crack in the plastic valve body.
(I
> > > > could see that it had been present for some time due to the
dirt/
> > > > corrosion present.) I then replaced the drain valve and
associated
> > > > fittings with brass or white plastic as appropriate.
> > > >
> > > > The pump doesn't vibrate the plumbing but it isn't
exactly "silent."
> > > > The mounting, even with rubber 'feet', etc. still vibrates the
> > > > bulkhead it's attached to, so you can hear the pump when it is
> > > > running -- but it's not particularly intrusive and you don't
hear it
> > > > over the "whoosh" of the shower, for example.
> > > >
> > > > I note, too, that I started having a problem with the
Microphor
> > > > toilet flushing. It does not "like" water pressure above 50
psi and
> > > > doesn't flush properly at the 65 psi from the water pump. I've
> > > > learned to open a water faucet valve on the bathroom sink,
then flush
> > > > the toilet in the fraction of a second before the pump kicks
on --
> > > > temporarily solving the Microphor problem until I can install
a
> > > > pressure limiter on the water line that serves the toilet.
> > > >
> > > > All-in-all, I'm very satisfied with the 6.7 gpm 65 psi
variable speed
> > > > pump. It has eliminated the two original pumps (that were both
> > > > leaking) and the complexity of the related plumbing along
with the
> > > > accumulator (expansion) tank. (Another source of plumbing
woes if the
> > > > diaphragm leaks or it becomes de-pressurized.)
> > > >
> > > > I'm also enthusiastic about PEX tubing (pipe replacement) and
the
> > > > Flare-It fittings. While special clamped fittings are often
used with
> > > > PEX (requiring a special clamping tool), the Flare-It
fittings don't
> > > > require any special tools, but a simple wrench-thing they
sell makes
> > > > tightening them a breeze (I used a channel-lock plier, but
their tool
> > > > would probably not leave tool marks like the pliers).
> > > >
> > > > In retrospect, about the only thing I might have done
differently is
> > > > to use 1/2 inch I.D. PEX tubing. It would have been much
easier to
> > > > bend into the loop shapes in the area I had available --
still, I was
> > > > successful with the 3/4 inch tubing and it does not restrict
the
> > > > water flow.
> > > >
> > > > I do not get "pulsating" very often ... but sometimes, when
the
> > > > bathroom or kitchen sink faucet is turned on, I see just a
little bit
> > > > of it -- but it goes away in a moment after the pump fully
comes up
> > > > to speed. I've never noticed it with the shower but, perhaps,
the
> > > > flow limiter in the shower head allows the pump to 'catch up'
before
> > > > any pulsating begins.
> > > >
> > > > The water is heated in an AquaHot system -- this is a
tankless hot
> > > > water system, so there shouldn't be any air pockets (as in a
hot
> > > > water heater) on a newer coach. (I assume you have an
AquaHot.)
> > > >
> > > > Did you install the high-capacity water filter? I note that
the
> > > > variable speed pump requires a high-flow filter. It was about
twice
> > > > the size as the water filters used with the old pumps in my
coach.
> > > >
> > > > Rather than an air pocket, there simply may be a restriction
> > > > somewhere in the lines into or out of the pump, causing it to
be
> > > > unable to fully come up to pressure as fast as it should,
when a
> > > > valve is opened.
> > > >
> > > > Pete Masterson
> > > > '95 Blue Bird Wanderlodge WBDA 42
> > > > aeonix1@...
> >
> > > > On the road at Lockhart Texas
> > > >
> > > > On May 1, 2007, at 2:50 PM, David Brady wrote:
> > > >
> > > > > I also have the Shurflo Smart Sensor 5.7 65psi pump. My
inlet
> > > > > and outlet plumbing are long lengths of 3/4" ID tubing. The
> > > > > connections to the pump are the Extreme Series Straight
> > > > > fitting 3/4" quick connects, part number 94-615-04. These
> > > > > fittings eliminate any elbows at both the inlet and
> > > > > outlet of the pump. The trouble is, I still get pulsating
and
> > > > > hunting while the pump tries to zero in on the pressure and
flow
> > > > > required. Anyone else have this problem? It's worse on the
> > > > > hot water than on the cold. I suspect an air pocket
somewhere,
> > > > > probably in my hot water heater. It gets better with time,
but
> > > > > by then, my fresh water tank is close to empty, it's time
to fill
> > > > > up, and the pulsating starts again. Again, I'm thinking an
air
> > > > > pocket.
> > > > >
> > > > > David Brady
> > > > > '02 LXi, Smokey
> > > > > NC
> > > > >
> > > > > Pete Masterson wrote:
> > > > >>
> > > > >> THe original pump in my coach provided 40-45 lbs pressure.
I
> > > > >> installed a ShurFlo variable speed pump that provides 65
lbs
> > > > >> pressure. The coach plumbing seems to be 'up' for this
although I
> > > > >> have an anomaly with the Microphor toilet (it doesn't like
pressure
> > > > >> above 50#). Mostly, the higher pressure gives you a
better "user
> > > > >> experience" when you take a shower. The variable speed
pump also
> > > > >> eliminates the need for the accumulator (expansion) tank.
> > > > >>
> > > > >> Pete Masterson
> > > > >> aeonix1@...
> >
> > >
> > > > >> '95 Blue Bird Wanderlodge WBDA 42'
> > > > >> El Sobrante, CA
> > > > >>
> > > > >> On May 1, 2007, at 11:35 AM, Keith Strehle wrote:
> > > > >>
> > > > >>> I am going to replace my water pump this weekend. There
are
> > ShurFlo
> > > > >>> pumps available on the shelf for about $70. The pump is
> > supposed to
> > > > >>> put out 45 psi but I've heard many people here talk about
the
> > 65 psi
> > > > >>> pumps. 65 psi seems a little much. Is 65 psi necessary
and how
> > much
> > > > >>> does the original pump put out?
> > > > >>>
> > > > >>> Thanks, Keith
> > > > >>> 84FC35
> > > > >>>
> > > > >>
> > > > >>
> > > > >> ----------------------------------------------------------
> > > > >> ---
> > > > >>
> > > > >> No virus found in this incoming message.
> > > > >> Checked by AVG Free Edition.
> > > > >> Version: 7.5.467 / Virus Database: 269.6.2/782 - Release
Date:
> > > > >> 5/1/2007 2:10 AM
> > > > >>
> > > > >
> > > > >
> > > > >
> > > > > [Non-text portions of this message have been removed]
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > Yahoo! Groups Links
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > > ----------------------------------------------------------
> > > >
> > > > No virus found in this incoming message.
> > > > Checked by AVG Free Edition.
> > > > Version: 7.5.467 / Virus Database: 269.6.2/782 - Release Date:
> > > 5/1/2007 2:10 AM
> > > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> > >
> > > ----------------------------------------------------------
> > >
> > > No virus found in this incoming message.
> > > Checked by AVG Free Edition.
> > > Version: 7.5.467 / Virus Database: 269.6.2/782 - Release Date:
> > 5/1/2007 2:10 AM
> > >
> >
> > [Non-text portions of this message have been removed]
> >
> >
>
>
>
> [Non-text portions of this message have been removed]
>