The intake pressure jumps around quite a bit during this and I think it confuses the pumps controller and it runs erratically trying to maintain a constant output. When there is a call for water the pump starts and the check valve slams open causing the thump. It appears that inlet check valve is allowing enough flow backward to pressurize the line between the pump and the check valve where it comes into the house (about 15' of 3/4 cpvc). I finally got around to trouble shooting it today. When I set the pump any higher than 40psi it thumps when it kicks on and then runs erratically, changing rpms sometimes stopping for a split second, which results in another thump when it starts up. That was a brief introduction to the three alarms indicated on the operating panel for dry running or water shortage, if the maximum runtime has been exceeded, or if there is a leakage in the system.I bought and installed a Scala2 pump to help with my low pressure due to elevation. Once you’ve located and addressed the source of the problem, you can reset an alarm simply by pressing the “Reset” button on the operating panel, resetting through Grundfos GO, or by enabling the automatic reset feature in Grundfos GO. You can learn more about the system alarms in Grundfos GO. If the anti-cycling function is disabled, you will still see the system alarm indication on the operating panel, but the pump will not stop. Once you’ve enabled this feature, starts and stops in a fixed pattern will bring the pump to a complete stop and the icon will appear on the operating panel. Thankfully, SCALA1 has an anti-cycling function that you can set in Grundfos GO. But if this continues for too long, it will result in cycling. If there is a tiny leakage in the system, SCALA1 will proceed to start and stop operation periodically. Leaks can for instance be caused by pipe breakage. If you set the maximum runtime function to 30 minutes, the pump will stop after 30 minutes of continuous operation and the maximum runtime alarm will appear on the operating panel.įurthermore, this alarm stops the pump from running in the event of a major leak in the system. You can set this during the pump setup in Grundfos GO, or you can activate it at a later stage. Next, there’s the maximum runtime function. However, during normal operation, this alarm will be activated just 40 seconds after the detection of no pressure and flow. If SCALA1 detects no pressure and flow within five minutes of being connected to a power supply, the alarm will be activated. However, the feature works differently during the first priming phase than it does during the operation phase. SCALA1 offers built-in dry-running protection that automatically stops the pump in the event of dry-running. Let’s take a closer look at the three alarms in question. It could mean that it is not getting water. It’s simply an indication from the pump, alerting the user that there may be an issue in the system that should be addressed.įor instance, if the dry running alarm flashes, it doesn’t necessarily mean that the pump can’t deliver water. It is worth mentioning that these alarms do not necessarily mean that there is damage to the pump. These alarms indicate if there is dry running or water shortage, if the maximum runtime has been exceeded, or if there is a leakage in the system. In this module, we will look more closely at the bottom three LED alarm icons on the operating panel. The Grundfos SCALA1 is an all-in-one pressure booster.
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