What height should the open vent pipe rise above the water level in an open vented fully pumped central heating system?
What height should the open vent pipe rise above the water level in an open vented fully pumped central heating system?
In a fully pumped central heating system there will be an open safety vent. This should rise to a minimum height of 450mm above the water level in the header tank to allow for any pressure surge effect created by the pump.
Does expansion vessel go on flow or return?
An expansion vessel is normally found on the central heating side of most domestic boilers. The expansion vessel is normally connected to the return side of the central heating and not the flow side.
Where is the feed and expansion tank in an open vented heating system?
Open vented systems comprise a Feed and Expansion (F&E) tank located at the highest point in the system. They work exclusively with heat only (also known as ‘regular’) boilers.
How does an open vented central heating system work?
Open Vented Central Heating System The open vented system is fed from a feed and expansion tank located in the loft, this keeps the system topped up and also allows the water to expand as it heats up.
Where does the expansion pipe lead in a central heating system?
The expansion pipe should lead off the flow pipe usually in the airing cupboard. For best results, it should be the highest point on the system. There must be a unhindered escape for boiling water and steam if the boiler thermostat develops a fault.
Where does the hot water come from in a vented boiler?
Vented hot water cylinders, or vented hot water storage units, need to be fed from a cold water cistern tank, which is kept in the loft, with the water being gravity fed via a vent pipe (hence the name ‘vented cylinder’) down to the hot water cylinder – usually installed in an airing cupboard.
Open Vented Central Heating System The open vented system is fed from a feed and expansion tank located in the loft, this keeps the system topped up and also allows the water to expand as it heats up.
How does hot water vent into expansion tank?
Then draw off a couple of gallons of water from the drain cock downstairs. Then tip in your X400 into the clean F&E and untie the ball so it refills, stir it well to mix it and it will be drawn down into the system to replace the water you drained out. Observe the colour of the water, it should quickly go inky black with loosened sediment.
The expansion pipe should lead off the flow pipe usually in the airing cupboard. For best results, it should be the highest point on the system. There must be a unhindered escape for boiling water and steam if the boiler thermostat develops a fault.
Can a cast iron boiler be installed in an open vented system?
Hamworthy’s Upton condensing boilers and Stratton mk2 wall hung boilers are suitable for installation in sealed heating systems only. However, our Purewell Variheat cast iron condensing boiler can be installed in an open heating system. For more advice call our technical team or request a site visit to review your current heating system.