Frequently Asked Questions About Grundfos’ SCALA2

Some installers working with Grundfos’ SCALA2 boosting pump have had questions about which tools to use, and some have found it difficult to understand the LED alarm indicators. Here’s some helpful advice that should clear up any confusion.

Tightening the connections and priming plug

The SCALA2 pump is designed so that no tools will fit, so you should only use your bare hands to tighten the connections. (As the label indicates.) Even though the connections are robustly constructed and reinforced, using tools can introduce so much force that cracks can occur. So please, only use hands to tighten connections.

The same goes for the priming plug. If necessary, you can use a screwdriver to loosen the priming plug. But it is important to tighten the priming plug by hand and continue until the plug reaches the bottom of the sealing surface. Never use tools to tighten. See more information in the quick guide.

LED alarm indicators

The SCALA2 alarms are designed to indicate problems within the installation. So, most likely the problem is not with the pump itself but somewhere within the system. To determine exactly what the alarm indicates, check the trouble shooting page of the I & O (Installation and Operation manual).