Emptying a pumped gas central heating system
Emptying a pumped gas central heating system
If you require work carried out on your fully pumped gas heating system you may want to clean the system. To exchange radiator valves or add an additional heating radiator as an example. Your heating engineer will normally be performing list has although some householders do have the confidence to try this themselves.
In most situations Cleaning the central heating is executed to clean the radiators. Switching off the boiler and central heating pump should be the first actions you take. Prevention of any extra water entering the gas heating system is also a priority.
The heating system has a header 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 cystern. This ball-valve is a ball attached to an arm that, when elevated closes the valve, which means when the cylinder is full no more water can arrive as the valve is shut. As the water level falls, say through Emptying, the ball drops in the water tank venting the valve and allowing more water to enter the heating system. To ensure that the central heating system fully empties we need to stop this mechanism. Using a metal or wooden rod to stop the ball leaves are falling in the cystern will stop water entering the system as the water is drained.
Once you have completed the above run a hosepipe from an outdoors clear to the outlet of at the bottom of one of your radiators. Water will now flow out of the radiator through the hose into the external flush. To clear your whole gas central heating system you need to attach this hosepipe to one of the ground floor radiators, the lowest ones in the house. Be patient and ensure that all water has emptied from the central heating system and no more water is entering before you commence any further work.
If you need to end this process promptly you can also open the bleed valves on the radiators on the upper floors. When completed work can now start on the system.