Dunkirk Q90-50 - Page 53

Troubleshooting Chart 2
NO .._
T
CHART 1
CHECK THAT CIRCUIT BREAKER IS ON OR
FUSES ARE OK AT THE ELECTRICAL PANEL
OK
CHECK THAT SERVICE SWITCH tS ON
CHECK CASTING TEMPERATURE SAFETY
SWITCH. PUSH RESET BUTTON ON SWITCH.
CONTACTS OPEN (BUTTON UP) OR CLOSED
(BUTTON DOWN)?
_ CLOSED
CHECK WIRING TO IBC. 120 VAC BETWEEN
TERMINAL 1 AND 3 AT WIRING HARNESS
PLUG CN7?
YES
120 VAC BETWEEN TERMINALS 1 AND 3 AT
CONNECTOR CN3 ON tBC?
YES
120 VAC AT TRANSFORMER PRIMARY
TERMINALS?
YES
24 VAC AT TRANSFORMER SECONDARY
TERMINALS?
YES
24 VAC AT WIRING HARNESS PLUG CN2?
YES
REPLACE IBC
NO
CHART 1
CHECK FOR 120 VAC BETWEEN TERMINALS
1 AND 3 AT CONNECTOR CN5 ON tBC?
YES
CHECK FOR 120 VAC AT CIRCULATOR
REPAIR/REPLACE CIRCULATOR
I
I
I
I
I
I
I
1
I
I
1
OPEN
NO
NO
NO
NO
NO
NO
NO
CHECK WATER LEVEL IN BOILER. CHECK
FOR AIR TRAPPED IN TOP OF BOILER.
CONTACTS WILL NOT STAY CLOSED UNTIL
BOILER COOLS OFF.
REPLACE/REPAIR WIRING FROM SERVICE
SWITCH TO IBC
REPLACE IBC
REPAIR WIRING TO TRANSFORMER
REPLACE TRANSFORMER
PUSH RESET BUTTON ON CASTING TEMP.
SAFETY SWITCH.
CHECK CONTINUITY OF CASTING TEMP.
SAFETY SWITCH CONTACTS. CONTACTS
OPEN OR CLOSED?
I CLOSED l _OPEN
REPLACE CAST. TEMP.
SAFETY SWITCH.
REPLACE/REPAIR WIRING FROM
TRANSFORMER TOIBC
;I
REPLACE IBC
REPLACE/REPAIR WIRING FROM
IBC TO CIRCULATOR
J
J
J
J
1
J
J