Derek in this video reacts to a gas trainers comments and asks do we gas rate a central heating boiler on high/low setting or central heating and hot water.
Most of the decisions we make in the field are open to our judgment and interpretation of the regs, on site situations and manufacturers instructions. I would much prefer someone like Mr Hunt to contact you privately to discuss a query rather than points score and make you out to be wrong in public. Your videos are spot on for us all to reference and make decisions on the day so keep them coming especially for the new entrants. Some people are visual learners and they take a lot more in from these videos than a book and gives them the confidence to get through the ACS. 👍
Derek, we work in an industry that is open to interpretation, personally combi gas rating I usually rate hot water as the max, as you say potentially it can help highlight faults, like blocked plates, not all boilers on max setting show the full hot water input, due to range rating etc. I do the max whilst doing the FGA but usually do a final as left gas rate, in hot water for combi boilers, standard heat only put both on and do a final then. Keep doing what you are doing, we are all gas safe registered, and at the end of the day, unless like you say you are a trainee, we all have our own understanding of things and over the years build a sound engineering judgement, providing we have followed updates and used everyday as a school day and learnt through our journey. I was a trainer for many years at British Gas, our guidance was printed in the old operational procedures, so most of the time was pretty sound. In wider industry it’s different the written word isn’t there for every task you come across, there are different guides with varying interpretations, so at the end of the day all we can do is talk to each other, keep up to date with changes, and get through doing what we think is best practice. Keep up the good work, and stick to what you think is correct, like most trainers if there is anything you doubt I’m sure you will dig deeper for conformation just to clarify you are passing on the correct information to your groups of learners 👍
As a newly qualified gas engineer I must admit I have always been a bit confused about this, It seems I was not alone! I can see why gas rating at max rate would remove the unpredicatability of the boilers modulating effect on gas consumption but the point is we want to see how the boiler is actually performing. I have found that in some installations putting the boiler on max rate causes it to overheat and cut out before you can gas rate. Likewise in properties with low cold water supply flow rates the boiler moldates down to maintain a consant hot water temperature, the same can occur on hot days with the central heating. So what is right, to be frank I am still unsure. At least if you put the boiler into max rate for the combustion analysis and do a gas rate at the same time its consistant and you can compare the gas rate with the CPA results. Please dont shoot me down in flames I genuinely want to be better informed.
A bit of a eye opener, but as usual your thorough explanation goes a long way to convince me that your as usual.... More right then most right wing politicians 😢 Ever thought of a job in politics?
Got to say I’ve been taught to gas rate in high and low and……. After watching this I realise what your saying is far more beneficial and gives me way more information about what the appliance is actually doing 👍🏼.
I am a trainer too and I agree with you. The 5 and 10% I use with students because you will never get an exact figure to match the MI’s, therefore, an inexperienced engineer will likely think there is a problem with the appliance. We have to remember that when boilers are tested they use a rig giving consistent CV’s and installation parameters so all boilers are tested the same. I used to do gas audits as well and if I saw a gas rate or heat input exactly the same reading as the MI’s on their gas safety certificate I knew they probably had not even carried out the test. Obviously you can’t prove it but it does give you a concern regarding the individual. Thanks for sharing the video.
Should the question be... 'what method did the manufacturer use to obtain their figures.' Shouldn't we be using the same method as the manufacturer used, to be able to make a comparison ..? The manufacturers figures you show us, show a figure for Central heating and hot water mode. Therefore we should be checking in the same way.
Hello! As always great vid! I was always under the impression that rating in HW & CH have you the rate in a more really life situation? How the customer will actually use the appliance! They won’t ever put it in engineer mode! So I agree with you!! 👍👍
You are offering a great service. It is interesting that there are different options on many areas. I appreciate you taking the time to review it; you are right.
Not long passed my tests to become gas engineer found your videos very helpful can’t comment against people having a go as they probs no more than me but I’ve found your videos very helpful as have a lot of others keep up the good work
I always understood it that on Commissioning you follow the Manufacturers Manual and fully complete the benchmark where applicable (Gas rate (min and max to me, means service mode, (as most manuals show this) which will put the unit in to min and max mode directly)), Combi cold water temp, dhw temp and the flow rate stated for that appliance, as well as all the other information required, For servicing ALL manufacturers manuals have a section on the recommended way to service their appliance (and what to further carry out if it fails the fan depression test), and like you say, LPG do not always have meters, so the co/co2, ppm, fgt, efficiency and ratio will tell you a lot. Maybe you should just put a banner up at the start of some videos with a disclaimer mainly for the one who commented then removed the comments (did he realise he was an a**h*le). Keep the vids coming, :) very good video :):):):) deffo thumbs up from me.
Brilliant video Derek, I have always done a 10 minuet warm up the CH test the rate on MAX next HW flow is OK then on MAX rate, works for me for 50 years.
