Oil Fired Boiler Tune Up

Albie

Hello,
I recently had a tune up on my boiler, 4yr old Peerless WBV-03 w/Beckett burner. Technician noted without explanation that there was "draft excess air pressure". Can anyone explain what this means and if there are any negative consequences? I'm wondering if the chimney is blocked in some way.
Thank you.

Steamhead

What draft level did they measure and record? Might look something like -04 .

HVACNUT

I would reach out to the company because "draft excess air pressure" isn't a term, especially without a number next to it.
There is excess air.
There is excess draft.
There is excess pressure. 
Is there a combustion report? 

Albie

Here's the report:
Fueloil #2
CO2 max 15.7%
4.6% O2
36ppm CO
500 deg F Fluegas Temp
83.1% EFF
77.1 deg F Ambient Temp
-0.044in H20 Draft
28.2% Excess Air Pressure
12.24% CO2
47ppm Undiluted CO

Robert O'Brien

Albie said:

Here's the report:
Fueloil #2
CO2 max 15.7%
4.6% O2
36ppm CO
500 deg F Fluegas Temp
83.1% EFF
77.1 deg F Ambient Temp
-0.044in H20 Draft
28.2% Excess Air Pressure
12.24% CO2
47ppm Undiluted CO

It's excess air not excess air pressure. It's the quantity of air above that needed for stoichiometric combustion. Numbers look alright, CO is slightly high but probably from servicing.

EBEBRATT-Ed

Your numbers look fine. it looks like the burner is set up properly

STEVEusaPA

Is that draft number at the breech or over the fire?

Albie

Steve - I believe the the draft number was at the breech.
Thank you all for your comments.