Commissioning New Boilers

[Spanner2k7]

Hi ppl,

Just a quick one, when commissioning a new install do you

A: Just do a Gas Rate.

B: Just do a Gas Pressure at the boiler.

C. Both

I always do both, I am now being told you only have to do one or the other, for the reason one can be correct whislt the other one is incorrect.

Cheers

 

[Billy Bob Bob]

both and a tt and general check over the whole install

 

[gaspastemania]

Surely you would do full safety checks ??
e.g when commisiong a quick run through 9 points??

 

[gasmarc]

and run all other appliances

 

[gasmarc]

9 points please list as new one on me:28:

 

[Spanner2k7]

Surely you would do full safety checks ??
e.g when commisiong a quick run through 9 points??

.

Yes all safety checks are done, just wondering what did and thought.

 

[SimonJohns]

Burner pressure on Band b (cough). CPA on band a


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[gasmarc]

cannot install band B anymore I thought

 

[SimonJohns]

Lol it was kinda a joke about another thread on here




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[kirkgas]

Hi ppl,

Just a quick one, when commissioning a new install do you

A: Just do a Gas Rate.

B: Just do a Gas Pressure at the boiler.

C. Both

I always do both, I am now being told you only have to do one or the other, for the reason one can be correct whislt the other one is incorrect.

Cheers

2 questions, 1) if you are fitting HE boilers how do you do a burner pressure test, 2) who tells you one or the other is sufficient? whoever is telling you this is talking nonesense, take a gas fire and think about this scenario/question, customer phones you to say fire doesnt seem to heat the room properly anymore, it now takes 40 minutes to heat the room when it used to take 20 minutes, first thought will be "there isnt enough gas" but when you take the burner/inlet pressure it is 17mb (as it should be as per MI) so if you leave the test there what is the problem? if you then check MI for HI and see it should be 6.3kw, if the burner pressure is right your mate is saying the HI MUST be right? what i would do is talk to customer, find out prob, take burner pressure to confirm gas is right and getting to fire then i would gas rate and prob find/calculate that the HI was 4.5kw rather than 6.3Kw (which would explain the customers prob) and i would then proceed to strip the injector/burner etc to clean then on rechecking i would still have 17mb but now a HI of 6.3kw and a happy customer, sorry for the long winded explanation, but it proves there are many people doing gas work who dont know the basics, the other way i get students to understand how important a gas rate calc is by turning on a fire and recording a BP of 17mb then slide a metal rule in to block one of the injectors, this halves the gas rate/output but doesnt alter the BP as it is recorded 50mm from the injector and replicates a choked injector/burner

 

[gasmarc]

I am putting an ideal in tomorrow now that is a joke lol

 

[GQuigley67]

just fire it up no checks, no inhibitor, no flushing no nothing and the jobs a good 'un
:icon6:



this is generally what I was taught off some guys I used to work with, not saying that I agree with it far from it, but I only really learned the install side of things from them, decided not to copy their bad habits though

 

[gaspastemania]

The problem with gas the minute you mention to someone your doing this or that then they have an instant opinion of what exactly you shouild do !! This in turn plays on your mind stresses you out and generally does your head in !!!
Wish i was a brickie all your tools in a bucket , build a wall go home and forget about work .

 

[Spanner2k7]

@ krikgas

Testing for working pressure at the boiler, he said I needed only to do working pressure or gas rate. If I got a pound for every time I have been told you cannot do working pressure on a boiler with a modulating gas or zero governo, I would be jacking the trade in. LOL

 

[Spanner2k7]

The problem with gas the minute you mention to someone your doing this or that then they have an instant opinion of what exactly you shouild do !! This in turn plays on your mind stresses you out and generally does your head in !!!
Wish i was a brickie all your tools in a bucket , build a wall go home and forget about work .

I know exactly what you mean, I just do both for piece of mind.

 

[Spanner2k7]

I am putting an ideal in tomorrow now that is a joke lol

They are Ideal Logic Combi's, I am commissioning. Had a great start. First one I did the hot water side, flicked the heating and F3 came up, turned the hot water on and still F3, boiler running probably 10 mins and the fans knackered.

 

[gasmarc]

i might bite the bullet and go for the potterton heatmax ,I want to sleep at night lol

 

[kirkgas]

@ krikgas

Testing for working pressure at the boiler, he said I needed only to do working pressure or gas rate. If I got a pound for every time I have been told you cannot do working pressure on a boiler with a modulating gas or zero governo, I would be jacking the trade in. LOL

i was having a go at the guy who told you either or, not you, but re zero govenor, what burner pressure can you get? i test at P2 point turn on boiler, fan sucks pressure to about -4mb then drops to zero when it fires,

 

[Spanner2k7]

i was having a go at the guy who told you either or, not you, but re zero govenor, what burner pressure can you get? i test at P2 point turn on boiler, fan sucks pressure to about -4mb then drops to zero when it fires,

I never checked this, nothing in boiler instructions, says to record or measure this.

 

[kirkgas]

I never checked this, nothing in boiler instructions, says to record or measure this.

we show it in the training centre, more as a basic functional check to let them see how it pulls the gas through as oppossed to recording what i would call a "real burner pressure"

 

[Spanner2k7]

I see, found out 1st hand how much the fan can pull, I was asked to look at a potteron powermax, that kept coming up with flame failure, put my u gauge on the incoming side of the gas valve, went into the negative, gas pipe was kinked before the meter, im sure the gauge went to -15 mb, was awhile ago though so i might be wrong about the 15mb

 

[Pssst]

Surely the thing to do is to commission it as per the manufacturers instructions? In that way,you cant go wrong.

 

[gasmarc]

i like that you cant go wrong , dream on young man:90:

 

[tomkatgastrain]

Hi take a look at my profile. I have contact info on there and can help you

Hi ppl,

Just a quick one, when commissioning a new install do you

A: Just do a Gas Rate.

B: Just do a Gas Pressure at the boiler.

C. Both

I always do both, I am now being told you only have to do one or the other, for the reason one can be correct whislt the other one is incorrect.

Cheers

 

[Spanner2k7]

Does anybody gas rate the heating on a combi boiler??