Troubleshooting Charts - Dunkirk 90-50 Installation, Operation & Maintenance Manual

TROUBLESHOOTING CHART S
CHART 4 CHART 4
YES I YES
POSSIBLY MIXTURE TOO LEAN!
CHECK GAS LINES DOWNSTREAM OF GAS
VALVE FOR BLOCKAGE.
ARE GAS LINES CLEAR?
IS GAS/VENTURI VALVE CORRECT SIZE?
SEE REPAIR PARTS DIAGRAM.
POSSIBLY MITURE TOO RICH!
CHECK FLUE PASSAGES IN BOILER PER
"MAINTENANCE AND CLEANING". ARE
FLUE PASSAGES IN BOILER CLEAN?
,_YES
CHECK MIXER AND BURNER FOR
BLOCKAGE PER MAINTENANCE AND
CLEANING INSTRUCTIONS. ARE AIR
PASSAGES IN MIXER AND BURNER
CLEAN?
4,
CHECK AIR ORIFICE AT BURNER INLET
FOR CORRECT SIZE. SEE REPAIR PARTS
DIAGRAM. IS ORIFICE CORRECT SIZE?
CLEAN/REPLACE GAS LINES.
BE SURE TO USE CORRECT GASNENTURI VALVE SIZE.
CLEAN BOILER FLUE PASSAGES PER MAINTENANCE
AND CLEANING INSTRUCTIONS
CLEAN MIXER AND BURNER PER MAINTENANCE AND
CLEANING INSTRUCTIONS
REPLACE BURNER
_r
DOES MAIN BURNER
RUN UNTILCALLFOR
HEAT ENDS OR HI
LIMIT AQUASTAT
CONTACTS OPEN?
NO#1
NO #2
NO #3
q
* IF THE ANSWER IS NO.
CHOOSE THE APPROPRIATE
PATH (#1, #2, OR #3) BASED ON
_r
CHART 6
SYMPTOMS SHOWN.
CHART 6 CHART 6
i
RUNS SMOOTHLY FOR ABOUT 6
SECONDS THEN SHUTS OFF.
INDICATES POOR FLAME SIGNAL.
CHECK IGNITER/SENSOR
POSITION. TIP SHOULD BE
SLANTED TOWARDS BURNER
YES
CHECK FLAME SIGNAL >0.6uA?
CONSULT BOILER MFGR. FOR
SPECIFIC INSTRUCTIONS.
REQUIRES SPECIAL TOOLS.
YES
REPLACE IBC
RESTORE
IGNITER/SENSOR
TO CORRECT POSITION.
DO NOT RELOCATE.
OXIDE COATING ON
IGNITER PREVENTING
FLAME SIGNAL.
REPLACE
IGNITER/SENOR.