If your Grundfos UPS3 pump is making noise, it might be due to small air pockets trapped inside. This air can affect the pump’s performance and cause unusual sounds. The good news is that the UPS3 is designed to self-vent, which makes the process simple. Here’s how to speed up the venting and restore quiet operation.
Note: If you’re not confident in taking on this task, it is safer to consult a professional for assistance.
Safety Precautions
• Before you begin, take a few simple precautions:
• Turn off the heating system to avoid any accidental contact with hot parts.
• Let the system cool if it was recently in use.
• Gloves are optional but may provide comfort if you feel the pump or pipes might be warm.
How to Bleed/Vent the Grundfos UPS3
The Grundfos UPS3 does not have a bleed screw as the pump is self venting. You can aid in the ventilation process by following the steps below:
• Step One: Set the Pump to Speed III: Find the button on the pump’s operating panel and set it to Speed III, which is the highest setting.
• Step Two: Run the Pump for at Least 30 Minutes: This helps the pump push any trapped air out of the system. How fast the pump vents depends on the size and design of your system, but 30 minutes is a minimum.
• Step Three: Listen: The system should now be running quietly. A low hum is normal but loud banging, whirring or clanking could mean air is still trapped or another issue is at play.
When venting is complete, adjust the pump back to the recommended speed setting for regular operation.
Final Check and Maintenance Tips
After venting, let the pump run for a few minutes to ensure it’s operating quietly and smoothly. Regular venting isn’t usually needed, as the UPS3 self-vents over time. However, if you hear unusual noises, repeating this process should help. Noise on starting is normal and will cease as the pump clears.
Pump Still Noisy?
If you are still experiencing noise every time your system runs, it could be a sign of excessive air in the central heating system. In this case, you may want to vent/bleed the radiators in your home also. If noise still persists, further investigation is necessary. Call in a qualified plumber or boiler technician to look at the system.
Conclusion
The Grundfos UPS3 makes it easy to handle trapped air, thanks to its self-venting design. By following these steps, you can quickly vent the pump and keep your heating system running efficiently.
