Burn Quality – CO2 Exhaust Measurement:
A qualified service technician with an exhaust
combustion analyzer can make adjustments to the air shutter if required. Measurements are
taken through the draft gauge probe port. Exhaust gas carbon dioxide readings should be as
follows for a clean furnace:
•
EL-140H / EL-200H = 10 – 11%
•
EL-350H = 11 – 12%
A qualified service technician may adjust the air shutter settings if necessary. Some burners
have an adjustable inner slotted air band, along with the outer adjustment shutter plate. To
adjust the plate, loosen the locking screws, then
rotate the shutter and retighten the locking screws.
The slotted air band should not require adjustment.
A higher number allows more air into the burner. A
lower number setting allows less air. The factory
settings shown below normally work well, but higher
altitude locations may require adjustments:
•
EL-140H: 5 for Plate – Closed Air Band
•
EL-200H: 7 for Plate – Closed Air Band
•
EL-350H: 4 for Plate – 4 for Air Band
Burn Quality – Smoke Measurement:
A qualified service technician may measure smoke
content, following procedures of his smoke pump.
•
Acceptable results per smoke pump comparison chart = zero or #1 smoke spot.
•
A yellow- brown smoke spot color is normal when burning used oil due to the presence
of non-combustibles.
•
The absence of black or dark grey soot indicates complete combustion.
Flame Monitoring Cad Cell:
A qualified service technician may check the cad cell [Flame on]
•
Disconnect the cad cell leads from the FF terminals on the controller.
•
Using TT and FF jumpers, run the furnace.
•
Measure the resistance (ohms) of the cad cell by probing across the cad cell lead wires.
•
An acceptable resistance is greater than 0 – 500 ohms for a new burner and heat
exchanger with the flame on.
•
Remove the TT jumper to lose the flame. The resistance reading with no flame should
be greater than 5000 ohms. Your meter may register “OL” if out of limit.
•
Make sure all jumpers have been removed when testing is complete.
Shutter
Settings
Shutter Adjustment
41
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