Flushing a gas heating system
Flushing a gas heating system
Taking the water out of a fully pumped heating system makes many maintenance tasks easier. To fit a thermostatic metal radiator valve or replace a broken metal radiator are two cases. Whilst this will be carried out typically by an experienced engineer it is something that the average odd-job man can execute if they have the knowledge of other household maintenance chores.
The primary cause for most people for Cleaning their central heating system is to clean the metal radiators. Before any work is attempted you need to turn off the central heating pump and heating boiler. Another necessary step is to ensure that no additional water enters the gas heating system whilst you are Emptying it.
The header cystern in the attic is used to normally top up the system with water. A common ballvalve is used in the expansion cylinder similar to that in a toilet. As the water reaches maximal level the ball floats on the surface and closes the valve. However when some water is drawn off the water tank, the ball drops, the valve opens and more water gets into the cylinder. This process will need to be stopped if the gas central heating system is to be fully emptied. Positioning a small plank of wood across the water cystern stopping the ball valve from moving will stop further water getting in the central heating system.
Once you have accomplished the above run a hose from an outdoors drain to the outlet of at the bottom of one of your metal radiators. The water from your radiator will passage through the hose and out of your radiator system. To flush your whole gas heating system you need to attach this hose to one of the ground floor metal radiators, the lowest ones in the house. Before you commence any other work on this gas central heating system you must now ensure that all the water has emptied out and no other the water is entering into the radiators.
By opening the bleed valves in the heating radiators on the top level you will help air to enter the gas central heating system and hurry up the Draining process. When all the water has gone you can now start work on the system.
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