FGA zero governor

[bikerbas]

Could someone explain why you have to use a fga on boilers with zero governors,

cheers

 

[newbie1]

you cant record burner pressure with zero governor but that isnt main reason for using fga
its an accurate way to tell if combustion process is right

 

[CMairiD]

I also use a FGA to check fan pressure on WB boilers with zero governors to determine if a service is required. You can'y use a U gauge because it's a negative reading.

 

[bikerbas]

Yes it tells you if the burner needs cleaning on the fan pressure if the tolerences are out

 

[GrahamM]

The whole point of zero governors is about efficiency.
You have no way of knowing if the appliance is operating at it's optimum efficiency without using an analyser on the POC to tell if they are within range.
You don't adjust burner pressure. You adjust the air/gas ratio. Hence the FGA.

 

[mikeygas]

FGA are also useful for checking the integrity of flues.

 

[moony]

I also use a FGA to check fan pressure on WB boilers with zero governors to determine if a service is required. You can'y use a U gauge because it's a negative reading.

yeah you can it just sucks instead of blows not very accurate though but good enough to check

 

[oldplumber]

I also use a FGA to check fan pressure on WB boilers with zero governors to determine if a service is required. You can'y use a U gauge because it's a negative reading.

Unless you are on the planet zanussi, then the normal laws of physics are still working here on earth and your water based manometer will read positive and negative readings. After all you either blow into the manometer or suck from the manometer and it will give you an accurate reading either way, have a go sometime.

 

[thomas donovan]

its called a zero governor because if you do put a u guage on it you get a zero reading therfore the fga is needed to commission/check

 

[CMairiD]

yeah you can it just sucks instead of blows not very accurate though but good enough to check

Yep, my mistake! Was with an engineer the other day that checked it that way.

 

[kirkgas]

you should use a manometer on a zero govenor to check the operation (to a point) when turned on the fan should suck to about 4mb then when the burner lights it goes back to zero the FGA is to check combustion, some engineers do this and record BP as 4mb which it isnt

 

[GasmanDon]

The fan speed depicts how much gas is used and therefore how much air to suck in to mix with the gas. Boilers with a zero governor have a high and a low setting which need to be set using the FGA as this is the only way to chech the CO2 readings. These must be within the tolerances, usually between 9.2%CO2(low setting) and 9.8%CO2(high setting). If the PPM of CO is above 200, then this proves that the heat exchanger requires cleaning. Instructions on how to set the gas/air ratio will be in the Installer Instructions. Hope you find this useful.

 

[abdul1977]

Hi
I am just new to the Heating industry just passed NVQ2 on domestic gas appliance.
Could some one explain to me please how do you check fan speed by using FLU analyser.Also how wud you check if the gas valve faulty.I suppuse u can check resistance on solenoid.If you have got resistance on solnoid does it mean its not faulty?
I would realy appreciate if someone explaine in plaine english
Kind regard Abdul

 

[E4gas]

Hi
I am just new to the Heating industry just passed NVQ2 on domestic gas appliance.
Could some one explain to me please how do you check fan speed by using FLU analyser.Also how wud you check if the gas valve faulty.I suppuse u can check resistance on solenoid.If you have got resistance on solnoid does it mean its not faulty?
I would realy appreciate if someone explaine in plaine english
Kind regard Abdul

Flu , plain, wud,