4/18/2024 0 Comments Grundfos scala 2 instructionsI 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. Remember, you can also find spare parts on the go, with the Grundfos GO app or MyGrundfos.I had a chance today to drain and triple-check my pre-charges were set to exactly the recommended pressure. To print the spare parts list, check the ‘spare parts’ box and the ‘exploded view’ box and generate the PDF. You can find service instructions under ‘documentation’. When it’s time to install the spare part, you can access additional information, including videos on how to assemble and disassemble the product. Step 3: Click on the spare parts for more information Click on the component number to see which spare part kit the component belongs to. It helps to be aware of when your pump was produced, so you can select the correct spare parts list. Step 2: Click the ‘spare parts’ buttonĬlick on the ‘spare parts’ tab to your right. Choose your pump to see all the information about it. This gives you a list of product choices. To find a spare part for your pump, search for the pump in the product menu. You can also find the spare parts you need on Grundfos Go or MyGrundfos. Just go to the Grundfos Product Center to find the pump spare parts you need. Finding the pump replacement parts you need should be neither time consuming nor a hassle.
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