54
9 - START UP PROCEDURE
9.10 Combustion Setup (High-Fire)
•
Remove exhaust port plug at exhaust flue test port.
•
Insert combustion analyzer into exhaust flue test port.
Verify the opening around combustion analyzer probe is
completely sealed when taking measurements.
•
Set boiler to high-fire by pressing two buttons
simultaneously. Display will show
H3
and the symbol
will appear.
• Measure percentage of O
2
or CO
2
in flue gases.
• Compare the measured values with values in table below.
•
Adjust gas/air ratio using high-fire adjustment screw (
V
)
if needed. Turn screw clockwise to reduce CO
2
level and
counterclockwise to increase it.
O
2
/CO
2
Values at Low-Fire Natural Gas (A)
Nominal value
Permitted value
O
2
%
CO
2
%
O
2
%
CO
2
%
4.8
9
4.5 - 5.2
8.8 - 9.2
O
2
/CO
2
Values at Low-Fire Propane Gas (E)
Nominal value
Permitted value
0
2
%
CO
2
%
0
2
%
CO
2
%
6.4
9.6
6.1 - 6.70
9.4 - 9.8
CO
2
Values Natural Gas (A) at High Fire
Front Panel
CO
2
%
Nominal
Range
ON
9.3
9.1 - 9.5
OFF*
8.9
8.5 - 9.0
9.11 Combustion Setup (Low-Fire)
•
Remove exhaust port plug at exhaust flue test port.
•
Insert combustion analyzer into exhaust flue test port.
Verify the opening around combustion analyzer probe is
completely sealed when taking measurements.
•
Set boiler to low-fire by pressing two buttons
simultaneously. If the boiler is already in combustion
setup mode for high fire, press the (-) button several time
until
L3
is displayed on the screen.
• Measure percentage of O
2
or CO
2
in flue gases.
• Compare the measured values with values in table below.
Remove front panel when comparing values.
•
Adjust gas/air ratio using low-fire adjustment screw (
K
)
if needed. Turn screw clockwise to increase CO
2
level and
counterclockwise to decrease it.
V
9.12 Operational Check
• Inspect combustion air and vent piping. Verify pipe is not
leaking and terminations are unobstructed. Verify vent gas
discharge is not a nuisance or hazard.
• Verify boiler functions.
• Inspect condensate disposal system. Verify condensate
flows adequately and is disposed properly.
• Check control module operation.
•
Check field sourced limits, low water cutoffs, etc. per
manufacturer's instructions.
CO
2
Values Propane Gas (E) at High Fire
Front Panel
CO
2
%
Nominal
Range
ON
10
9.8 - 10.2
OFF*
9.6
9.2 - 9.7
* Installer's guide only. Use test port to verify safe CO
levels with door installed before leaving job site.
PN 240011662 Rev. H [04/30/2019]
