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Hi to all, I understand Ohms law in theory, I=V/R. I have tested a fan I have salvaged from an old boiler using some flex, with a 3 amp fuse fitted into the plug (same rating fuse would be in boiler). All is fine and fan works. 240V is going to the fan and the fan has a resistance of 40...

Hi, I have a four panel pine door From a salvage yard which has been dipped, and I would like to stain it a slightly darker colour. Not sure what to do as I've been given lots of different advice. Do I need to seal it before I do anything else? If so what with? I would like a matt finish. What...

Hi, I have a very heavy cast iron radiator I wish to restore. I would like to know the process in which to do this. I have been advised against powder coating because there is a chance the seals can break?? I know a good way to remove the old paint is by sand blasting, but is there other ways I...

Hi could anybody tell me the voltage Reading across both flow switches on an alpha 240 E. I suspect it is low. Thanks in advance.

Hi Is this a fault ? white and orange wire from valve still show 240 v when CH is satisfied or turned off. The only way to stop this is to turn off at the mains or turn HW on. I ve got a brief idea what is happening inside the valve but cannot grasp where the 240v is coming from. All I...

I understand the theory behind sizing gas pipes and I have applied this to a real situation. Without going into it too deep I have calculated that i need to start with 28 mm pipe from the meter and then drop down to 22mm all the way to the boiler.I am only installing the pipework. The...

Hi I was reading about the Megaflow system fit. This cylinder comes with everythig pre assembled, valves, pump etc. It says a system boiler would not be suitable for this because it already has a built in pump. What boiler would be suitable? Maybe a conventional boiler ? Can you get a...

Hi Could I use a combi to heat an unvented cylinder to supply hot water to a 230 litre jacuzzi. If I need a recovery time of 30 mins would this depend on the boiler capacity or the cylinder? What size boiler (combi or not)and cylinder would I need? Not bothered about the instant hot water...

Hi, What is the purpose of the 'hot water OFF' terminal in a programmer on a Y plan. I notice it goes from cyl stat 2 through the grey wire to the 3 port mid pos valve. What is its function. I have also read that when heating and HW are both off the valve motor is de-energised and the valve...

Hi, Does anybody know any websites that explain CH systems,eg S plans, Y plans, inner workings of 2 and 3 port valves etc, and maybe diagrams etc. Thanks student.

Im studying a diagram of a programmer(horstman C27) and also a roomstat diagram (Honeywell T6360B). The programmer instructions show CH wire going to roomstat (C terminal), with a choice of switching to (CALL OR SAT)...This I understand. Coming of the CALL terminal is a zig zag wire (resister...

I am doing my ACS so please dont think Im tampering. I have to do a job for my course but I need some advice. The customer has a radiant convector gas fire fixed to the wall. The problem is that is not central to the chimney breast. It is about 3 inches off centre. It is a lined chimney with...

Is the filtered air that is blown across the heat exchanger and into the plenum chamber used also for combustion on an open flued unit. Thanks

I asked this question few weeks ago but still confused. Im quoting some of this from a book. Test for regulator working pressure at meter 'Turn on ONE appliance at full rate(lets say cooker)' should read 21mb+/- 2mb. (For arguments sake say pressure was 21mb). It then says with ALL APPLIANCES...

Hope somebody can help me with this question. Im training to be a gas engineer, please be patient with me. Am I correct to say that to test your working pressure at the meter you attach your gauge and for example turn a minimum of three rings on cooker and expect a reading of 21mb + or - 2mb...

What is this hole actually for and how does it work? Am I right in saying that it is to break the flue pull (if so how) so the burner is not starved of air and also to change the air in the room. What could happen if it was covered up? An in depth answer would be a real help. Thanks for any help

Could somebody please explain the ignition sequence. (eg common, normally open, normally closed wires). Also what would happen if the fan was to fail and the air pressure switch/micro switch? was stuck down. Thanks