Attach the hose to each side of the valve and open the mains cold tap. Open the second tap which allows water in to the heating system Watch the pressure rise and stop once the bar reaches just about one and turn off both taps Remove the taps from the hose, there will be some water drip out so be mindfull.
Internal Filling Loop Keyed Locate the key this will usually be on a flap underneath the boiler or it may have been provided you as part of the installation On the front right hand side you'll notice an open black port and this is where the key fits You'll notice a picture of an open padlock and a closed padlock and on the white key there is an arrow on the shaft, align the arrow with the open padlock as you push it up into the open port Turn the key and watch the pressure rise to just over one bar Turn the key back to the open padlock and remove.
Be mindful of any water dripping. Keyless Internal Filling Loop A keyless filling loop is easily identifiable, as you'll see a blue lever at the bottom of your boiler To repressurize the system with the keyless filling link simply pull down the blue lever Once the pressure has increased to over one bar, release the lever.
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However, there are two main ways to top up your boiler , either via an external filling loop or an internal filling loop either keyed or keyless — and both methods are demonstrated in the video and the step-by-step guide below.
You may have noticed that your heating has become less efficient, or that the pressure gauge on your boiler turns to red. If you are unsure of the type of filling loop you have, do ask your installer who will be able to confirm. MORE: How to improve the efficiency of your central heating system. If you have a system with an external filling loop, you will see two valves, one from the mains cold water, and a second that is connected to the heating system.
You will also have a silver braided hose to connect the two valves to allow you to repressurise the boiler. Once the hose is securely attached, fully open the valve for the mains cold water, followed by the valve that connects to the heating system.
Leave the valves open until the boiler pressure is indicated at just over 1 bar. Then you can close both valves. Leave the hose attached while you go around and bleed any air from all of the radiators in your home. Then go back to the boiler and check the pressure again — you may need to top it up again. Once you are satisfied the pressure is at 1 bar, make sure both valves are in the closed position and remove the connecting hose. Do this over a bucket as there may be some water in the hose.
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