Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 28-06-2019, 05:50   #1
Registered User

Join Date: Jun 2019
Posts: 9
HRO Watermaker problem

Hi
I was wondering if anyone could help. Ive got a Seafari Mini 750 watermaker and it keeps showing ID3 "Low water pressure" on the income side. Ive changed the prefilters, the strainer and pulled apart the booster pump - which all seems fine. I cant measure pressure or flow aboard although when I start the booster pump it reads over 10Psi on the panel but as soon as the high pressure pump starts the inlet pressure drops down to almost vacuum (0 Psi).
Ive just about tapped-out with frustration and exhausted my rudimentary knowledge.
I will have to head in to Bodrum to try and get it fixed if I cant figure this issue out.
Thanks in advance.
__________________

Clockwork575 is offline   Reply With Quote
Old 28-06-2019, 06:07   #2
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 25,975
Re: HRO Watermaker problem

First check that your thru hull and strainer are clear, you may have a jelly fish or something stuck in the thru hull itself.
What you describe matches exactly to they way a restricted inlet presents. Not saying it is, but itís where Iíd start
__________________

a64pilot is offline   Reply With Quote
Old 28-06-2019, 06:15   #3
Senior Cruiser
 
GordMay's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 35,635
Images: 241
Re: HRO Watermaker problem

Greetings and welcome aboard the CF, Clockwork.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 28-06-2019, 06:18   #4
Registered User

Join Date: Jun 2019
Posts: 9
Re: HRO Watermaker problem

Thanks, I did try that and its all clear. Ive followed everything through to the machine itself and it all seems good.
Can booster pumps achieve pressure (PSI) but not flow when they are worn out? It seems to be fine though.
Clockwork575 is offline   Reply With Quote
Old 28-06-2019, 06:26   #5
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 7,225
Re: HRO Watermaker problem

Have you tried disconnecting the inlet hose and running the booster pump? Does the flow seem adequate?

What type of pump is the booster? A diaphragm, a centrifugal, an impeller?
Sailmonkey is online now   Reply With Quote
Old 28-06-2019, 06:37   #6
Registered User

Join Date: Jun 2019
Posts: 9
Re: HRO Watermaker problem

Its a centrifugal pump but I havent pulled the outlet off and watched the water flow. The centrifuge looked to be so simple it simply couldnt fail...but Im sure it could. I even pulled apart the non return valve after the booster pump to see if this was clear and working - which it was.
Clockwork575 is offline   Reply With Quote
Old 28-06-2019, 08:11   #7
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 25,975
HRO Watermaker problem

Itís tough to get 10 PSI out of a Centrifugal pump, although I much prefer them as they are so simple.
I still think you have a restriction if it used to work, then suddenly stopped. How are you checking?
a64pilot is offline   Reply With Quote
Old 28-06-2019, 08:17   #8
Registered User

Join Date: Jun 2019
Posts: 9
Re: HRO Watermaker problem

I sit at the unit itself (watermaker) and turn the booster pump on...there is positive pressure there (but of course I dont know the flow).
As soon as I turn the watermaker on (high pressure pump) the inlet pressure drops away and the machine drops.
I was wondering if it could be a blocked feed line to the low pressure gauge and low pressure sensor (are these fed the same way?).
I also note that the fresh water wash shows to provide plenty of PSI on the low pressure side when its washing.
Clockwork575 is offline   Reply With Quote
Old 28-06-2019, 08:20   #9
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 7,225
Re: HRO Watermaker problem

Iím convinced itís either a blockage or a spun vane impeller on the pump shaft
Sailmonkey is online now   Reply With Quote
Old 28-06-2019, 08:25   #10
Registered User

Join Date: Jun 2019
Posts: 9
Re: HRO Watermaker problem

Thanks Sailmonkey, I'll have another crack tomorrow. I will take the inlet hose off right at the watermaker and see if its getting flow and pressure. If not I'll work back to the booster pump checking along the way.
Clockwork575 is offline   Reply With Quote
Old 28-06-2019, 08:51   #11
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 25,975
HRO Watermaker problem

Quote:
Originally Posted by Sailmonkey View Post
Iím convinced itís either a blockage or a spun vane impeller on the pump shaft


Spun vane would slip more as pressure built wouldnít it?
Meaning you would get flow, but little pressure, he is having the opposite problem I believe.

But good thinking, I didnít even consider it cause I didnít think about it.
a64pilot is offline   Reply With Quote
Old 28-06-2019, 08:54   #12
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 7,225
Re: HRO Watermaker problem

Quote:
Originally Posted by a64pilot View Post
Spun vane would slip more as pressure built wouldnít it?
Meaning you would get flow, but little pressure, he is having the opposite problem I believe.

But good thinking, I didnít even consider it cause I didnít think about it.


Iím thinking itís possible the vane could spin enough to generate 10psi, but not able to provide any real volume. But who knows. It could be a dead catfish in the strainer elbow.
Sailmonkey is online now   Reply With Quote
Old 28-06-2019, 14:30   #13
Registered User

Join Date: Jun 2019
Location: Bay of Islands New Zealand
Boat: Morgan 44 CC
Posts: 135
Re: HRO Watermaker problem

It’s probably too obvious to state that flow and pressure are not really connected. An example: connect a garden hose to a municipal (high pressure) system, turn the faucet on just a little bit then try to pinch off the hose. Even though there is no volume, the pressure will soon build to a point where you can’t hold it back any longer.

With that as a backdrop, it would seem obvious also that the pump can deliver good pressure but poor volume. Whilst I don’t know what pump you have, I can’t say how it can be fixed except that a replacement pump would tell that story beyond dispute one way or another.

Beg, borrow or steal another pump and try it.
CassidyNZ is offline   Reply With Quote
Old 30-06-2019, 07:42   #14
Registered User

Join Date: Jun 2019
Posts: 9
Re: HRO Watermaker problem

So I've pulled the hoses off the booster pump and it seems great. I pulled the inlet hose off the watermaker (after all the filters, strainers etc) and its also great. Lots of flow, lots of water.
So I reconnect the water and turn the booster pump on...again 12 PSI. But as soon as the high pressure motor starts the pressure immediately drops to zero.
However I noticed the low pressure gauge tube is taken off the high pressure pump manifold very "near" the inlet. Seems a silly place to have it as it's reading may be affected by the high pressure pump.
It may be attached here as its right where the water comes into the HP manifold pump and gives the actual water reading at the actual pump - not in the hose coming into it.
Anyway, its really got me beat.
Clockwork575 is offline   Reply With Quote
Old 30-06-2019, 08:01   #15
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 7,225
Re: HRO Watermaker problem

So youíre registering low pressure with an electronic transducer.

Do you have any sort of mechanical pressure gauge you can mount to verify the electronic gauge is reading correctly?

Or maybe verify that the booster pump continues to operate when the high pressure pump is turned on?

It now appears to be an electronic gremlin (faulty pressure gauge, or opening relay for the booster) rather than restricted flow.
__________________

Sailmonkey is online now   Reply With Quote
Reply

Tags
water, watermaker

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale: HRO System 9 Watermaker System swdreams88 Classifieds Archive 3 01-09-2012 22:16
For Sale: Watermaker - HRO System 9/500 Lookfar52 Classifieds Archive 2 01-09-2012 21:40
For Sale: HRO 170 12vdc, 7gph Watermaker ssnick Classifieds Archive 4 22-09-2011 20:59
HRO Watermaker franklin63 Plumbing Systems and Fixtures 5 29-06-2011 21:23
Seeking OLD HRO Watermaker Manual or Wiring Schematic Projectboats Plumbing Systems and Fixtures 2 11-12-2010 09:35



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 06:19.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.