Vaillant Turbomax 282

[JAH HEATING]

How would you call this?

Doing a safety check, this the only gas appliance and a tenants own cooker.

Working pressure at meter 19.12 mbar. WP at boiler 14.12 mbar. Gas rate good, FGA boiler aswell an readings are fine.

I'd say the carcass, 22mm off meter to bedroom then across to kitchen to boiler 22mm us 18mtrs tops.

I've left it on, everything was working fine. Not effecting the safety of appliance or cooker, but there is a pressure drop.

Advised on fitting a test point under boiler on LGSR.

The boiler has been in for years

 

[Chalked]

Why would you need to fit a test point near the boiler, when there's one on the boiler?

 

[JAH HEATING]

Aren't you losing pressure at the valve?

 

[Chalked]

The gas inlet valves on these came with a test nipple. ( I think!)

Have you connected you manometer to both the gas valve and combustion chamber? You might get a different result.

 

[Last Plumber]

28 k boiler over 18 Mtrs on 22mm plus bends I presume ?
Will give a pressure drop. However, without knowing how many bends or checking calls, 5 mb sounds a bit more than I'd expect.

Check inside the GV mesh filter for copper oxide. It may have a partial blockage.
As you've said though, if it is not effecting any other appliance I would log it and leave it on.

 

[ShaunCorbs]

as above needs looking at and make a note on the llsc low op pressure at appliance

is that pressure with the cooker on aswell?

 

[Rabbitman]

As previously said in post 5 check the filter there a bugger for black dust..........

 

[JAH HEATING]

The cooker being on didn't alter the pressure much at the gas valve.

The thing what I dont get, acceptable pressure drops across a carcass is 1mb on the Pipework.

OK, I'm testing at the valve but it kind of makes a mockery of saying max pressure drop allowed is 1mb.

New appliances aswell, some will work off min 14ish mbar. It kind of contradicts itself if you ask me?

Anyway it's still on, an it's been recorded.

 

[JAH HEATING]

The gas inlet valves on these came with a test nipple. ( I think!)

Have you connected you manometer to both the gas valve and combustion chamber? You might get a different result.

This didn't

I checked the inlet, an b.p.

B.p was fine

 

[Last Plumber]

The cooker being on didn't alter the pressure much at the gas valve.

The thing what I dont get, acceptable pressure drops across a carcass is 1mb on the Pipework.

OK, I'm testing at the valve but it kind of makes a mockery of saying max pressure drop allowed is 1mb.

New appliances aswell, some will work off min 14ish mbar. It kind of contradicts itself if you ask me?

Anyway it's still on, an it's been recorded.

The 1 mb loss comes from the idea that an unregulated appliance
I.e. Hobs, gas fires, wall heaters etc are designed to work with a working pressure of 20 mb in our world. ( there is a slight drop off through appliance controls that usually gives around 17 mbar burner pressure)

Therefore, with 21 mb ( as it was intended ) at the meter, the only way to govern the 20 mb at an appliance was via pipe sizing.

If your appliance is not affecting any of those unregulated appliances when they're running and it's recorded that there's an issue with pressure drop on the installation
( and the boiler mf's agree that 14/15/16 mbar etc is sufficient) it will be OK.

 

[JAH HEATING]

Cheers