can a DIY'er range rate a boiler?

bhm1712 · 21 Aug 2009

i have no idea how it is done, but i think my boiler needs it, as after changing to c plan, and balancing the system, with the addition of a couple of TRV's and changing the boiler stat i think i may have affected this

any help much appreciated

doitall · 21 Aug 2009

I would sooner say you have converted it wrong.

What boiler make/model is it, and what exactly have you done.

bhm1712 · 21 Aug 2009

why have i converted it wrong?

the c plan has been active for 6 months, i was only enquiring as to how its done, as i have heard that a boiler needs it to be most efficient! i have no problems with the system at all!

i just was unsure as to weather these mods required that it be re done?

the c plan conversion is a strict copy of honeywells plan, with a check being carried out by a plumber to ensure that i had not made the system dangerous by addition of Motor valve etc....

shambolic · 21 Aug 2009

Why would they??
The boiler output is the boiler output unless you have increased or decreased it but you should in no way be touching gas valves and adjusting burner pressures if you are not an RGI!!!!!!!

doitall · 21 Aug 2009

bhm1712 said:
why have i converted it wrong?

the c plan has been active for 6 months, i was only enquiring as to how its done, as i have heard that a boiler needs it to be most efficient! i have no problems with the system at all!

i just was unsure as to whether these mods required that it be re done?

the c plan conversion is a strict copy of honeywells plan, with a check being carried out by a plumber to ensure that i had not made the system dangerous by addition of Motor valve etc....

Obviously something is wrong or you wouldn't be changing boiler stats or asking questions.

Old boilers have a specific return connection, if you have altered the pipework around and used the wrong tapings it won't be so hot, and could be potentially dangerous, if the cold feed and vent is also wrong.

bhm1712 · 21 Aug 2009

i didnt even know what range rating involved, thats why i was asking,

i was under the impression that it was something to do with the thermostat setting in relation to the required heat output...i would never mess with anything GAS, im an electrical and instrumentation technician not a gas engineer.

i just assumed that with the addition of TRV's which shut down rads and the fact that the CH is now independant of the HW that it would need to be adjusted as the boiler isnt trying to heat the cylinder all the time that the CH is on.

is there any set rule of thumb, at which setting the boiler stat should be adjusted to?

i feel bad for asking now, as i have been accused of messing around!

bhm1712 · 21 Aug 2009

nothing is wrong!!! honest!

the system works fine, the motorised valve is in the correct place, sited AFTER the vent and feeds in the hot water tappings, as verified by a qualified plumber and gas engineer.

i have NO issues, the hot water is fine and the heating is fine, the control circuit operates correctly and the boiler stat closes and opens the gas valve perfectly.

i was merely enquiring as to weather the mods required a resetting of some sort.....as i didnt want the boiler to be doing work for nothing..

my idea of what range rating was, was incorrect and i now stand corrected!

the c plan was to save me money, The TRV's were added to aid control of upstairs temperature which was always around 1-2 degrees warmer than downstairs where the roomstat is and the boiler stat was replaced due to it being faulty, setting it to a low setting held the burner on for longer, and setting it high shut the boiler off almost completely!!

nothing sinister here!

doitall · 21 Aug 2009

1. There's no need to feel bad, it is a DIY forum.

2. when posters play with things we like the whole picture, as it's quite easy to get wrong.

3. you set the stat as low as possible to get the required heat, and turn it up a tad as it gets colder.

bengasman · 21 Aug 2009

In short: if the system works fine, nothing else needs doing.
This is presuming the boiler was fine before the change.

Agile · 22 Aug 2009

If anything needed to be done then I would have expected the fully qualified plumber and gas engineer would have done it !

The boiler output needs to be accessed and compared with the heating output required.

I do have to say that many in our trade and not very good at this and usually fit oversized boilers and leave them set too high. Its probably to lessen the calls saying something is too cool and if the customer spends more on their gas then "so what".

Tony

jiltedjohn · 28 Aug 2009

rating a gas boiler is easy and can be done by any member of the public, in this case "Google is your friend" "range rating" implies altering the gas pressures of the boiler and that is NOT for the public

if you have had a "C plan" installed then hot water temp is set from the cylinder stat and the boiler stat needs to be set to a temp higher than the cylinder stat, other than that nothing to do your service guy should be checking the gas rate as part of the service (you do get it serviced don't you?)

kevplumb · 28 Aug 2009

Agile said:
If anything needed to be done then I would have expected the fully qualified plumber and gas engineer would have done it !

The boiler output needs to be accessed and compared with the heating output required.

I do have to say that many in our trade and not very good at this and usually fit oversized boilers and leave them set too high. Its probably to lessen the calls saying something is too cool and if the customer spends more on their gas then "so what".

Tony

wah wah wah

"our trade" dunno how you dare

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can a DIY'er range rate a boiler?

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