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Dunkirk Manuals
Boiler
Q90-200
Installation, operation & maintenance manual
Dunkirk Q90-200 Installation, Operation & Maintenance Manual page 38
Gas-fired direct vent condensing hot water boiler
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:
Installation, operation & maintenance manual
(48 pages)
,
Installation, operation & maintenance manual
(48 pages)
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Table of Contents
Troubleshooting
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Table of Contents
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Troubleshooting Chart 4
CHART 3
YES
IGNITER/SENSOR WARMS
UP AND GLOWS
YELLOW/ORANGE
DURING 20 SECOND
WARM UP
YES
AFTER 20 SECOND
IGNITER WARM UP, GAS
VALVE IS ENERGIZED
VALVE LIGHT IS ON
2 SECONDS LATER POWER
IS REMOVED FROM
IGNITER/SENSOR
IGNITER LIGHT IS OFF
DOES MAIN BURNER
LIGHT?
YES
CHART 5
TROUBLESHOOTING
CHECK FOR 120 VAC
BETWEEN TERMINALS 1
NO
AND 2 AT CONNECTOR
CN1 ON IBC (DURING
IGNITER WARM UP)
YES
CHECK FOR 120 VAC AT
IGNITER/SENSOR LEADS
ON WIRING HARNESS
(DURING IGNITER
WARM UP)
YES
CHECK FOR 24 VAC
NO
ACROSS TERMINALS MV
ON THE GAS CONTROL.
WHILE VALVE/FLAME
INDICATOR LIGHT IS ON
YES
CHECK IF IGNITER/
SENSOR POSITION IS OK?
TIP SHOULD BE SLANTED
TOWARDS BURNER
YES
CHECK GAS SUPPLY
PRESSURE AT INLET
PRESSURE TAPPING ON
GAS CONTROL IS GAS
PRESSURE GREATER
THAN 4.0" W.C.?
YES
CHART 5
NO
REPLACE IBC
NO
REPAIR/REPLACE WIRING
FROM IBC
TO IGNITER/SENSOR
REPLACE IGNITER/SENSOR
CHECK FOR 24 VAC
NO
ACROSS TERMINALS
CN6-2 AND CN6-5 ON
IBC, WHILE THE VALVE/
FLAME LED IS LIT
YES
REPAIR/REPLACE WIRING
BETWEEN IBC AND
GAS CONTROL
RESTORE IGNITER/SENSOR
NO
TO CORRECT POSITION.
DO NOT RELOCATE
ARE ALL MANUAL
SHUT-OFFS IN THE GAS
NO
SUPPLY LINE AND ON
THE GAS CONTROL IN
THE OPEN OR ON
POSITION?
YES
CONTACT THE GAS UTILITY
TO TURN THE GAS ON
38
NO
REPLACE IBC
NO
OPEN OR TURN ON ALL
MANUAL SHUTOFFS
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This manual is also suitable for:
Q90-150
Q90-1750
Q90-125
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