Long explanation but it has to do with the pump not knowing how slow it can go and when to shut off. That is also the way the Pentair PID system works. I cannot believe the distributor told you that is the way they are supposed to work. I have a video of this happening and will try to post it. It is also very common for the pressure transducer or VFD itself to malfunction, which will also cause the pressure to spike above 100 PSI. Expansion would also only cause spike pressure sometime after the pump shut off. If expansion was what caused the pressure to spike above 100 PSI, it would show you the tank in the pump is so small it is useless. The little tank built into the pump is after the check valve that is also built into the pump. You are correct that a variable speed pump should slow down to supply the demand and never shut off as long as there is a demand. This video shows what I am experiencing, but I have longer cycles: I went with a larger Amtrol ST-12 thinking it would help maintain a bigger buffer of pressure and smooth out the pump engagement, but maybe it is taking a little too much work off the pump slowing the feedback loop that the pump depends on. I might give a smaller pressure tank a try. I imagine if I had much higher flow, or a lower set pressure, it might stay on longer or continuously. My theory is now that there is more "elasticity" in the system that allows pressure to be maintained within the 10psi target band of the pump for longer so it takes breaks. It seemed to cycle a lot less before I introduced the external pressure tank. I just spoke with their distributor and he told me that this seems normal, but my understanding was that the pump should "slow down" to maintain a constant pressure. It clearly has speeds, as the pressure settings on the pump create audibly different frequencies. I thought the speed was supposed to be variable and expected it to hold a steady pressure at whatever speed was needed. Maybe it's unnecessarily stressing me out, but I don't like the sound of the pump turning on and off. My measured pressure seems to ping-pong from 60-70psi as the pump goes on and off. With 2 taps open wide, the pump clicks on for a mere 5-10 seconds, and then stays off for around 30, before cycling back on. Internal pressure tank, and external pressure tanks set to 70% of that = 50.75psi. Pump outlet pressure set and measured 72.5psi. Price Match guarantee is valid on price of item only, not on shipping and/or handling charges.I had a chance today to drain and triple-check my pre-charges were set to exactly the recommended pressure.Note: Any coupon that is issued from a retailer or brand that also has retail stores is considered a competitor coupon, not a manufacturer coupon. A manufacturer’s coupon may be used in combination with a price match.A customer can choose between the price with a coupon/offer OR the competitor price but may not use a coupon/offer with the competitor price unless the competitor would accept it.reserves the right to limit quantities on a price match to one per customer. ![]() Price match does not apply to items promoted as “limited time,” “limited quantity,” “while supplies last” or any similar language.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |