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Posted:  11/19/2007 7:23 AM #19271
Nacho
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Subject: Pentair Rainbow 320 Chlorinator Problems
I am having a very strange problem with my Pentair Rainbow 320 in-line chlorinator that no one can diagnose. The chlorinator is not working correctly in that it is not eroding the tablets and adding chlorine to the water. We have switched the inlet hose to the upper inlet, replaced the check valve in the bottom, replaced the cap O-ring and the lower mount O-ring and replaced the screen in the bottom. Basically we have replaced everything on this Rainbow 320 but the main housing. To trouble shoot we threw some tablets in the floating basket type chlorinator and it feeds chlorine to the pool. But our in-line chlorinator still will not work. Do you have any ideas for us to try? We sure could use some support here in tackling this tough situation if anyone out there has seen this happen. Thank you for your time on this.



Posted:  11/19/2007 11:50 AM #19272
Admin Andy
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Hi Nacho,
Can you give us a photo of the filter system, and chlorinator installation?
Andy



Posted:  11/19/2007 1:44 PM #19273
Nacho
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Thank you for the response, Andy. I'll get out there this week, get a photo, and see if I can get it posted here. Thanks. Tom.



Posted:  11/19/2007 10:12 PM #19274
michael89156
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It has to be a flow problem, leave the top off, and start up the pump and see if you see H2O flowing into the chlorinator. If not check the feed line that goes to it. Or the valve on the chlorinator.



Posted:  11/20/2007 6:53 AM #19275
Nacho
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Thank you for the response, Michael. I did forget to mention in my first post that with the cap off the chlorinator water does flow into the chlorinator and the valve is correctly regulating the flow as I turn it to each setting. So far my pool builder is stumped (equipment is now out of warranty) and I am awaiting a response from Pentair. I'll bet you're right about it being a flow problem, though. I mean we've pretty much ruled out everything else. My pool builder suggested I bump the run time of the pump up to eight hours a day from the six I run it now. I guess that will be the next thing to try. Strange, isn't it?



Posted:  11/26/2007 8:56 AM #19276
Nacho
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Andy, here (hopefully) is a photo of my pump and filter configuration. Thanks for any info you can provide.




Posted:  12/5/2007 7:21 AM #19277
Nacho
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Last Post:9/19/2008
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WOW. It looks like my problem is stumping everyone here on poolcenter.com. The folks at Leslies cannot figure it out, nor can the people who built the pool when I talked to them on the phone. Any new ideas out there?



Posted:  12/5/2007 7:52 AM #19278
pooltech
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you should get Pentair a call 1-800-831-7133.
APSP Tech II (NSPI)former member of IPSSA.


Posted:  12/5/2007 11:37 AM #19279
JohnT
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320s sometimes have problems with air being trapped preventing water flow, and also with the screen getting clogged in the bottom. Since you replaced the screen, that seems unlikely. Since you are in the top feed position, does the chlorinator drain itself when the pump is shut off?






Posted:  12/5/2007 3:03 PM #19280
Admin Andy
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I think I have it. The cause may be, that the flow is too good! Try to reduce the size of the eyeballs at the pool wall to create some more back pressure. That may allow more water to flow through the feeder.


Just my two cents


Andy





Posted:  12/6/2007 7:25 AM #19281
Nacho
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Pooltech, thanks for the Pentair phone number. I have e-mailed them but received no response, so I'll try calling.

JohnT, the unit DOES drain itself when the pump is shut off, and there is free flow of water through the check valve. Thank you for that good troubleshooting tip.

Andy, you may have something here. I've noticed that the pressure in the filter is running at about 30 PSI which is about 10 over the usual. And yes I wondered why the pressure did not drop even though I had just cleaned the filter cartridges. So too much pressure through the return line may just possibly be preventing the gravity feed of the water to flow out of the chlorinator? We may have a cause here. Now, I'm not too worried about HOW this happened, BUT how, exactly, do you reduce the water pressure with adjustments to the eyeballs at the pool wall? I know you can adjust the direction of them but is there also a way to restrict the flow through them? Maybe I have just never noticed. Is that the only way to bring the pressure down? We did install a new pump motor last summer but it is the same HP as the one it replaced.

Whether I am able to finally tackle this beast of a problem or not I just want to thank all of you for the time you have taken with me on this. Tom.



Posted:  12/6/2007 11:24 AM #19282
CONEY ISLAND KEN
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Is your CYA or Calcium levels real high...They could be gunking up everything...Years ago we had a similar problem and we cleaned the cartridge filter real good and the pressure went down to 12 and everything was fixed,,,,



Posted:  12/6/2007 12:31 PM #19283
JohnT
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Date: 12/6/2007 7:25:44 AM
Author: Nacho

I've noticed that the pressure in the filter is running at about 30 PSI which is about 10 over the usual. And yes I wondered why the pressure did not drop even though I had just cleaned the filter cartridges. So too much pressure through the return line may just possibly be preventing the gravity feed of the water to flow out of the chlorinator?




Did you just scrub the cartridges or soak them in acid or whatever the manufacturer recommends. 30psi is an awful lot of pressure. I think it might be time to consider a new cartridge. You'll probably want the second one on hand to soak the first one anyway.




Posted:  12/7/2007 6:52 AM #19284
Nacho
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JohnT, I just sprayed the cartridges with a hose, did not use any cleaner on them. Tomorrow I plan to do the soak with the solution. The cartridges ARE three years old though and it is probably time to get four new ones. OUCH, they are over $100.00 each at our local pool store so I may end up ordering them on line.



Posted:  12/7/2007 7:07 AM #19285
CONEY ISLAND KEN
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I have the same chlorinator that you have,,,,I bought the same filter made by a different manufacturer at Lowe's last year for $65.00 and no problems....Just make sure you get the exact size you are using now....



Posted:  12/14/2007 6:59 AM #19286
Nacho
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WHOO- HOO! The problem is solved. After cleaning the cartridges with the solution last week, the pressure dropped to 16 PSI. After a few days of running, the pressure did rise to a running pressure of about 29 PSI, BUT the tablets were finally eroding and the chlorine level was back up to normal. While we do need new cartridges, at least we now know what was causing the chlorinator to not work. The running pressure was too high to allow the chlorinator to gravity feed the water back in to the system. I just really want to thank all of you for your contributions in solving this problem that had stumped so many of us. Take care. Tom.



Posted:  12/14/2007 7:21 AM #19287
CONEY ISLAND KEN
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I don't mean to brag, but I did gradiate 6th grade, so this was an easy problum to solve....



Posted:  6/15/2008 8:09 PM #19288
Mikeb
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I know this was kind of an old post, but I too seem to be having the same problem. 3" tabs just are not being dissolved. My filter pressure is up around 30psi. I clean my four cartridge filters regularly by hosing off, and often by pulling them out and completely hosing them down. Is there anywhere to find an owners manual to the Pentair 320? Not sure how to take it apart without manual and don't want to break it. :{

Any help would be greatly appreciated.

Thanks in advance,

MikeB



Posted:  6/16/2008 6:19 AM #19289
JohnT
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Mike, I'd be a little concerned about 30 PSI filter pressure. Normal pumps can only produce about 36psi if the return line is sealed, so you are fighting a pretty significant restriction. I'd bet it's just a lack of flow that is causing your problem. Are your cartridges more than a year or two old, and have you ever acid cleaned them?



Posted:  6/16/2008 8:27 AM #19290
Mikeb
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John:

Thanks for the reply. Yes they are more than a year old (orginal, about 3 yrs). I have never used an acid cleaner. What do you use and how?

Thank you,

Mike B



Posted:  6/16/2008 8:34 AM #19291
JohnT
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It varies by manufacturer, so see your filter owners'manual. Normally you soak them in a cleaner, then soak them in diluted acid.

At 3 years, if it's not too big of a financial hit, you probably want to consider new cartridges.




Posted:  7/28/2008 3:20 PM #19292
Bob H
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Hi, I have a different question reagding the Pentair 320 series Chlorine Feeder.
Firstly I should say I am a new pool owner - Pool only installed about 4 months ago.

Recently when I open the feeder I've noticed that it is full of water - almost ot the top and when I put tables in it the water comes over the top and continues to do so for quite some time. It wasn't this until recently. Previously I think the water level was below halfway.

Is this something to worry about and if so, how do I fix it?

Also, can you tell me where I can get a manual for this unit. The link at the website doesn't seem to work.

Thanks
Bob H



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