Does anyone wire SWG on a fireman switch? There are conflicting reports on whether a check valve is needed between SWG and heater. Adding a fireman's switch would negate the need for one.
SWG with fireman switch
- Thread starter AndyBSN
- Start date
Andy,
I do not understand your theory at all...
The idea of a check valve between the heater and the chlorine tablet dispenser is because when the pump shuts off there is still highly concentrated acid and chlorine in the dispenser and it can run backwards through the plumbing and into the heater where it eats away at the heat exchanger.. The check valve prevents this from happening.
A SWCG on the other hand, has no concentrated anything... so there is nothing to run back into the heater.. And the SWCG can't generate chlorine when the pump is off because two safety devices turn the SWCG off when the pump is not running.
Why do you believe that the fireman's switch would help?
Puzzled,
Jim R.
I do not understand your theory at all...
The idea of a check valve between the heater and the chlorine tablet dispenser is because when the pump shuts off there is still highly concentrated acid and chlorine in the dispenser and it can run backwards through the plumbing and into the heater where it eats away at the heat exchanger.. The check valve prevents this from happening.
A SWCG on the other hand, has no concentrated anything... so there is nothing to run back into the heater.. And the SWCG can't generate chlorine when the pump is off because two safety devices turn the SWCG off when the pump is not running.
Why do you believe that the fireman's switch would help?
Puzzled,
Jim R.
There is concentrated chlorine at the cell and in the line leading to the pool, less than in a traditional chlorinator but still higher. Fireman switch will turn it off prior to pump turning off and dilute the line. If the pump turns off at the same time as the cell there will still be concentrated chlorine in the line.
Saturn94
Bronze Supporter
- Mar 11, 2015
- 1,864
- Pool Size
- 20000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
I read a thread recently (can’t find it right now) where it was said the FC increase after the cell is only 2-4ppm, depending on flow rate. So, I don’t think the FC is as concentrated after the cell as you might be thinking.
If I come across the post, I’ll update with a link.
Edit: found it. See the note at the end of post #25
Possible bad salt cell?? - Page 2
If I come across the post, I’ll update with a link.
Edit: found it. See the note at the end of post #25
Possible bad salt cell?? - Page 2
Andy,
A salt cell does not have a high concentration of Chlorine, even when it is running.. It makes very little chlorine at any one time. Keep in mind that the water coming from the pool and running through the heater already has 4 to 8 ppm of chlorine in it..
The main thing that eats a heater core is having very low pH water sitting in it. Chlorine tablets contain a lot of acid.. it is this mixture of acid and highly chlorinated water feeding back into the heater from a tab dispenser that causes the problem.
Thanks,
Jim R.
A salt cell does not have a high concentration of Chlorine, even when it is running.. It makes very little chlorine at any one time. Keep in mind that the water coming from the pool and running through the heater already has 4 to 8 ppm of chlorine in it..
The main thing that eats a heater core is having very low pH water sitting in it. Chlorine tablets contain a lot of acid.. it is this mixture of acid and highly chlorinated water feeding back into the heater from a tab dispenser that causes the problem.
Thanks,
Jim R.
No need for the check valve.
Just have your SWG’s timer turn off 5 or 10 minutes before the pump shuts off, to clear the lines.
Besides, there’s no high concentration of chlorine to be concerned with, as already stated.
Just have your SWG’s timer turn off 5 or 10 minutes before the pump shuts off, to clear the lines.
Besides, there’s no high concentration of chlorine to be concerned with, as already stated.
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