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Use test instruments to set combustion:
i
NOTICE
i
Always use calibrated test instruments to set combus-
tion levels. Verify that test instruments are calibrated and
in good working condition.
If not already provided, drill
test access holes in the flue pipe near the breech (or
upstream of the boiler breech damper, if applicable) and
in the front mounting plate area for firebox pressure.
Be
careful not to damage any water-backed surface.
Verify that all boiler sections, canopy, and access plates or
doors are fully equipped with gaskets and sealed against
any leakage, which could affect the combustion test re-
sults. Before making these tests, operate the burner for
several minutes to allow the heating system temperature
to stabilize or nearly reach steady-state levels.
Record
all results in the start-up log for future reference.
CI Draft - Set the breech or furnace pressure to the
level specified
by the appliance
manufacturer.
Typical example: +0.10" W. C.
C3
C3
C3
Oxygen - It is recommended
that you measure
the oxygen (02) early in the test sequence be-
cause high levels of carbon monoxide can be cre-
ated at very low or even very high 02 levels. The
typical operating range is between 2.5% - 4.5 %.
The equivalent carbon dioxide (CO2) operating
range is 9% - 10.5%.
Carbon monoxide
(CO) -An operating range of
0 -50 PPM is recommended for the CGI0 burner.
The maximum carbon monoxide (CO)level
per-
mitted in the flue gas by the UL 795 Standard is
400 PPM (.04%).
Stack
Temperature
- The stack temperature
should be within the range specified by the appli-
ance manufacturer.
It is influenced by input firing
rate, flame shape, excess air ratio, and cleanli-
ness of boiler flue passages.
This temperature,
combined
with the ambient temperature,
and
02% (or CO2) is used in calculating the appli-
ance efficiency.
Recommended
combustion
test sequence:
.
.
.
.
Adjust the draft or breech pressure to the appli-
ance manufacturer's
recommended
level.
provide a margin of reserve air to accommodate
variable conditions.
Measure the carbon monoxide level and adjust
air settings, if necessary, to regulate it to about
50 PPM for a starting point.
Measure the 02 or CO 2 at the 50 PPM CO level.
For this discussion, assume the 02 is 1.5% (11%
CO2).
Open the air adjustment until the 02 level ts in-
creased by at least 1% or to 3% 02 (whichever
is higher). This should reduce the CO level and
5. Sample the CO level again. It should be in the 0
to 20 PPM range.
6. Check the draft to ensure it still meets specifi-
cations.
If a major change in draft is required,
repeat the above steps.
.
Perform any final adjustments and lock the air
settings securely. Run the burner through sev-
eral cycles to verify prompt ignition and stable
burner operation.
_-O
6104
BCGIO
R08
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