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Gas heating systems can be drained







Gas heating systems can be drained

At some moment in the life of your fully pumped gas heating system you will want to flush it. To work on a radiator problem or to extend the system perhaps. Your engineer will normally be performing list has although some householders do have the confidence to try this themselves.

Whilst there can be a multitude of reasons the most frequent is to flush the heating radiators. Before any work is undertaken you need to switch off the heating pump and gas fired boiler. To successfully finish this job you also need to check that no more water enters the heating system.

The central heating system has a expansion cystern in the attic which will ensure that any water shortfall is topped up. This has a ball-valve that is the same as the one seen in your toilet water tank. Rising water levels in the tank mean that the valve is closed as the ball floats higher on the water surface. As the water level falls, say through Draining, the ball drops in the water tank opening the valve and allowing more water to enter the gas central heating system. To fully flush the gas heating system this top up process will need to be stopped. Laying a small plank of wood across the water cylinder stopping the ballvalve from moving will stop further water entering the gas central heating system.

Once you have accomplished the above run a hose from an outside empty to the outlet of at the bottom of one of your metal radiators. Once you vent the outlet valve the water will be able to current through the hose to the outdoors flush. The hose should be connected to one of the lower radiators if you intend to clear the whole heating system. Be patient and ensure that all water has emptied from the gas heating system and no more water is entering before you start any further work.

If you need to complete this process promptly you can also vent the bleed valves on the metal radiators on the top floors. Work can commence when all the water has flushed away.

Posted in Boiler


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