Wayne LC2300M Manual page 29

NOTE: ALWAYS USE RELIABLE COMBUSTION TEST INSTRUMENTS. BEING PROFICIENT IN
THE USE OF THESE INSTRUMENTS AND INTERPRETING THEIR DATA IS NECESSARY FOR
29. Perform the following combustion analysis. All adjustments below must be made with the following
instruments: draft gauge, O2 or CO2 analyzer and CO tester.
a. Adjust the primary air damper to provide about 25% excess combustion air. Confirm this by
checking the flue gas for its FREE OXYGEN (O
PERCENTAGES with a test instrument. Free oxygen should be about 4.5%, or carbon
dioxide should be about 9.5% for natural gas, 12.1% for propane gas.
b. CARBON MONOXIDE (CO) – Should be checked for its presence in the flue gas. This
percentage should not exceed .04% (or 400 PPM air free).
c. The flue gas temperature should be between 325°F (163 °C) and 550°F (288 °C) for
gas burners. Higher flue gas temperatures indicate over-firing or excessive draft
through the appliance. Lower flue gas temperatures may cause excessive
condensation and indicate under-firing. Consult your local utility or the appliance
manufacturer for acceptable flue gas temperatures.
NOTE: THE LC2300M WAS DESIGNED TO FIRE INTO POSITIVE (UP TO 2.0 INCHES
W.C.), NEUTRAL, OR SLIGHTLY NEGATIVE (UP TO –0.2 INCHES W.C.) COMBUSTION
CHAMBERS. FOR OPTIMAL PERFORMANCE, CHECK OVERFIRE DRAFT AND
ADJUST TO NEGATIVE -.01 (2.491PA) TO -.02 (4.982PA) INCHES W.C. DURING BURNER
OPERATION IF POSSIBLE. (2.3MMBTU BASED ON BALANCED CONDITIONS.)
30. Check combustion using flue gas analysis instruments. Set the burner to about 20% excess
air and check that good combustion is obtained. Check the actual gas flow on the gas meter
to ensure that the correct input power is achieved.
63899-002 Rev. A 3/20/2024
SAFE, RELIABLE AND EFFICIENT BURNER OPERATION.
For Natural Gas:
For Propane Gas:
If an O analyzer is used:
2
If a CO analyzer is used:
2
=
COairfree
) or CARBON DIOXIDE (CO
2
11 7 .

COppm
% CO
2
)
2
29