He reset the pressure to about 1.8 bar. You must make sure you have enough expansion for your system. Also, check to make sure it’s the correct size for the system. I take it thats a 6bar vessel?Would you not have to disconnect the old internal vessel for fear of loss of pressure through that? With a sealed/pressurised system the expansion vessel takes over this situation. Sizing an Expansion TankCareful calculation of the expansion tank size is critical to the correct functioning of the system. Normally this is just flexible fill up a loop that is connected to the cold water mains and the return pipe on the boiler. The expansion vessel has changed the way central heating systems work. Expansion vessels protect closed heating and hot water systems from the effects of fluid expansion and contraction. If you are not sure which size vessel you require please see the formula at the bottom of this page. Not so long ago, most central heating systems installed in the United Kingdom were open vented. If you don’t drain the radiator prior to removing it, it will leak water all over your floor! Gas Safe Registered For LPG and Natural Gas. It comprises of a vessel in which there is a diaphragm and on one side of the diaphragm is compressed air that is normally pressurised to a set pressure using the Schrader valve on the expansion vessel, on the other side of the diaphragm is the central heating water. Heating Expansion Vessel or Tank Sizing Guide The Following has been prepared as an aid to correctly size a sealed system Expansion Vessel. If you fit an expansion vessel, you also need to fit a pressure relief valve. Expansion vessels. Fit a pressure gauge on the pressure reducing valve (There currently isn't one so I've no idea what the pressure is) 4. Diaphragm expansion vessels The correct pressure is the fundamental requirement for the proper operation of water based heating, solar, cooling and pressure booster systems. You will normally find a Red Vessel (Heating Vessels) to be used on a Sealed System Heating application whilst the most common use for a Blue Vessel or White Vessel (Potable Vessels) would be in a potable application such as an Unvented Water Heater or a Pumped System. The expansion vessel has changed the way central heating systems work. Expansion vessels for closed heating systems. all you need is a tyre press gauge & a bicycle pump, when press is zero pump vessel to 1/2bar(7-8 psi) then pressurise system from cold feed to 1bar. Expansion tanks perform a simple but very necessary function. If you fit an expansion vessel, you also need to fit a pressure relief valve. yeh you could easily put an external expansion vessel in the system. Thermal expansion is created during the heating of water, which can lead to problems if the system does not have a way to store some of the excess amounts of water and steam. Because you now have no feed and expansion tank, you will need a fill-up supply pipe. In a case of this kind, it is advisable to calculate the expansion volume per subsystem and then to sum them. The expansion vessel is then connected to the central heating system. So to sum up these boilers were removed and new ones fitted also with the extra an expansion vessel of the correct size. To correctly test an Expansion Vessel you will need to isolate and remove the Expansion Vessel from the system. I have seen this many times over the years. Losing pressure daily, no leaks and not the expansion vessel. Check out the tutorial to learn how to fit an external expansion vessel into a boiler. A buffer vessel or Flexcon intermediate expansion vessel may have to be fitted between the system and the Flexcon expansion vessel. Plate HE; Brazed HE; Refrigeration; Technical support. When the system is cold the expansion vessel is nearly full of air or nitrogen, when hot, the water expelled from the system by expansion enters the vessel and compresses the air or nitrogen. Reflex vessels feature: * Carbon-steel shells – Light, strong and durable * Easy fit – Fast fit solutions including wall brackets * Water Regulation Compliance – WRAS Approved Products including Robokit
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