Refilling a central heating radiator generally refers to re-pressurizing the entire system after it has lost pressure, which in turn affects the radiators. Here's how to do it:
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Locate the Filling Loop: The filling loop is usually a flexible, braided hose with valves at each end, connecting the mains water supply to the central heating system. It's typically found near the boiler.
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Check the Pressure Gauge: Before you start, check the pressure gauge on your boiler. It usually has a green zone indicating the correct pressure (typically between 1 and 1.5 bar).
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Open the Valves: Slowly open both valves on the filling loop to allow mains water to enter the heating system. Watch the pressure gauge as you do this.
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Reach the Correct Pressure: Allow the pressure to rise until it reaches the green zone (1 to 1.5 bar).
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Close the Valves: Once the correct pressure is reached, close both valves on the filling loop, ensuring they are fully shut.
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Check for Leaks: Inspect the filling loop and surrounding pipework for any leaks.
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Bleed the Radiators: Start by bleeding all the downstairs radiators first. Then, bleed all the upstairs radiators and any towel radiators you may have. Bleeding releases any trapped air in the system.
Important Considerations:
- Safety: If you're unsure about any part of this process, consult a qualified heating engineer.
- Pressure Loss: If your system loses pressure frequently, there may be a leak that needs to be addressed by a professional.
- Bleeding Radiators: After refilling, bleeding radiators is crucial to remove trapped air, which can prevent them from heating properly.
- Regular Checks: Regularly check the pressure gauge on your boiler and top up the pressure as needed.
