Navien Combi Boilers

[Deleted member 221031]

What does that look like ?

 

[hard-work]

Some negative pressure gas valves when coupled up to the right fan with give -50 mbar at the valve's oulet. That is minus 50. That may help you along the way.

 

[Deleted member 221031]

-50mbr at the valves outlet ?

 

[hard-work]

After the venturi. I don't think you will get it. Remember I did give up on you.

 

[Deleted member 221031]

After the venturi. I don't think you will get it. Remember I did give up on you.

I’m trying. So the fan creates a negative pressure then.

 

[shambolic]

Our fans create a negative pressure and pulls gas and air through Venturi but it is then positive pressure on the other side of fan to push through burner.
How does your burner work then?

 

[shambolic]

Fecking fan the size of a jumbo jets engine to get -50mbar.
Ours creates -11pascals on full rate at gas valve outlet.

 

[Deleted member 221031]

Where’s Dangermouse when you need him

 

[oilboffin]

Hmm I think hard work been on this forum before under another name his post style is beginning to look familiar,so why all this abuse to skilled people.Bob

 

[Deleted member 221031]

Hmm I think hard work been on this forum before under another name his post style is beginning to look familiar,so why all this abuse to skilled people.Bob

Who’s Bob ?

 

[fixitflav]

That’s got a positive pressure gas valve. The pressure from the meter pushes gas into the burner.

Exactly..... Not zero governed.

I know, that's what I said in #122. I was comparing the 2 types.

 

[fixitflav]

Some negative pressure gas valves when coupled up to the right fan with give -50 mbar at the valve's oulet. That is minus 50. That may help you along the way.

That sounds rather high, 500mm water.

Ours creates -11pascals on full rate at gas valve outlet.

And that seems low, 1.1mm water. Maybe it's enough for your burner.

 

[hard-work]

That sounds rather high, 500mm water.

-20 wg. Then look at the pressure before the valve and the differential.

 

[picasso]

Probably a typo... should read 1k pascals.

 

[fixitflav]

-20 wg. Then look at the pressure before the valve and the differential.

OK. Mine produces something like 50mm, 2" wg. Yours is clearly different.