During a breakdown visit you suspect the boiler expansion vessel is burst, please list below the procedure for confirming the vessel is faulty and how you would remedy this.
there is a schrader valve on the top of the tank. release the air and if water comes out the vessel needs replacement since the diaphragm is broken. i have heard of replacing only the diaphragm in the tank but i do not recommend it. the tanks also corrode with age and if the diaphragm is broken it won't be long until the tank integrity is compromised. the inside is not meant for water and likely rust has already started inside. if no water comes out and only air read the tank and it will say what pressure it needs to be at. pump it up with a bicycle pump. check the schrader valve for leaks. it likely needs to be tightened and that is where the air leaked out. there is a tool you can get at about any hardware store that is for tightening those valves. replacing the tank is pretty simple but the details of removing it depend on the piping that is hooked up to it. you may have to cut the plumbing feeding it to unscrew the male fitting out of the bottom of the tank. there may be a union you just undue then unscrew the fitting. however it happens you have to remove the tank from the male fitting and then replace by teflon tape the male adapter, (important to put the teflon tape in a direction so that it will not come off while turning the fitting) and install it in the new tank and reconnect the plumbing.
When replacing a gas valve on a combi boiler what readings need to be set if any, and how would you carry this task out?
can you tell me more about the problem you are having?
hi, mate there is no problum i need a few answers fo some technical questions for my portfolio
can you ask me everything all together so i know what i am dealing with? or is this the only other thing you need to know? which there is quite a bit to this question. is there a particular gas valve for a model you are inquiring about or just in general?
this is in general.
i will help you with all the questions you may have and offer all the detail needed. we started with a question about the tank and now we are going to talk about changing a gas valve which should be taken care of by a qualified techician. it seems you may have other questions too and i am happy to help but i would like to know all we are dealing with. are there other technical questions you would like answers to also? are you a technician and do you have the equipment required?
Yes im a qualified gas engineer but looking in to the repairing side of things i have all questions about repairing and fault finding
What readings do you require on a condensing combi boiler when carrying out a service? Describe how you would take them and what equipment is required for these.
i will be very happy to help but it seems you may have several technical questions. could you give me an overview of all the questions you have?