Weird Problem with Hayward T-9 Generator

LarryJ50

Member
May 2, 2024
5
Destin, Fl
Pool Size
9800
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-9)
Hi all-
I'm having an unusual issue with my Hayward T-9 salt generator. It is 2-1/2 years old servicing a 9800 gallon pool (yes I know it is oversized). I do keep my pool open year round (NW Florida) but seldom use the pool in the winter. The Aquarite is set at about 20% and has been that way since installation. It keeps the pool at 2-3 ppm Cl.

Here is what is going on: Last year I changed out my single speed pump for a VS pump. I run the pump at 3000 RPM for 2-1/2 hours, followed by 6 hours at 1500 RPM (unless heater is on then 1900 RPM) followed by 1 hour of 3000 RPM, total 9 -1/2 hours per day. The Hayward flow switch is "made" at about 1250 RPM so there is chlorine generation for those 9+ hours.

But, every once and a while, I check the Aquarite and it shows 0 salt, generation off and inspection required. The first time I saw this, I pulled the T-9 and did an inspection, found nothing, but hosed off the T-9 anyway. Started it back up and it ran fine for a while a couple of weeks then the same thing happened. This time, I just ran the pump up to 3000 RPM for a few minutes, brought it back down to 1500RPM and all the error lights cleared and salt showed at 3200 and salt generation began.

What it seems is that the flow switch is made at the lower RPM but for some reason the salt measurement gets fouled up somehow. Is that even possible? I don't think the cell is going bad because once the error clears all Aquarite parameters are within the norms and salt generation is keeping the Cl level good. The duty on the cell is pretty low so I expect a reasonably long life.

Any thoughts??
Larry
 
Does your system show NO FLOW when your pump is off?

If not, your flow switch is stuck closed and the cell is trying to generate when your pump is off.

Is your Aquarite powered off when your pump is off?
 
Hi guys-thanks for the replies. To respond to questions :
Yes the system shoes No Flow when pump stopped
Aquarite is powered when pump is off.
Cell is horizontal with hump up.

I will try and rotate with hump down- can you help me understand what is the difference?

Thanks again
 
The process generates chlorine gas and hydrogen gas.

With the hump up at low speed, the gasses collect in the hump above the red line, which leaves the plates about 1/2 out of the water and this reduces the ability to produce.


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With the hump down, the plates stay fully submerged in water and production is at full rate.

The design was fine when pumps were single speed and oversized.

However, with variable speed pumps at low speed, the design does not work properly.1746576999130.png
 
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