Carrier BW9 Series Installation Instructions Manual page 30

NO
CHECK THAT CIRCUIT BREAKERS IS ON OR
FUSES ARE OK AT THE ELECTRICAL PANEL
CHART 1
CHECK THAT SERVICE SWITCH IS ON
CHECK CASTING TEMPERATURE SAFETY
SWITCH. PUSH RESET BUTTON ON SWITCH.
CONTACTS OPEN (BUTTON UP) OR CLOSED
(BUTTON DOWN)?
CHECK WIRING TO IBC. I20 VAC BETWEEN
TERMINALS 1 AND 3 AT WIRING HARNESS
PLUG CN7?
120 VAC BETWEEN TERMINALS 1 AND 3 AT
CONNECTOR CN3 OR IBC?
120 VAC AT TRANSFORMER PRIMARY
TERMINALS?
24 VAC AT TRANSFORMER SECONDARY
TERMINALS?
24 VAC AT WIRING HARNESS PLUG CN2?
REPLACE IBC
NO
CHECK FOR 120 VAC BETWEEN TERMINALS 1
AND 3 AT CONNECTOR CN5 ON IBC?
CHART 1
CHECK FOR 120 VAC AT CIRCULATOR
REPAIR/REPLACE CIRCULATOR
TROUBLESHOOTING CHART 2
OK
ON
OPEN
CLOSED
YES
YES
YES
YES
YES
YES
YES
TROUBLESHOOTING
Fig. 28 --- Troubleshooting Chart No. 2
30
CHECK WATER LEVEL IN BOILER. CHECK
FOR AIR TRAPPED IN TOP OF BOILER.
CONTACTS WILL NOT STAY CLOSED UNTIL
BOILER COOLS OFF.
NO
REPLACE/REPAIR WIRING FROM SERVICE
SWITCH TO IBC
NO
REPLACE IBC
NO
REPAIR WIRING TO TRANSFORMER
NO
REPLACE TRANSFORMER
NO
PUSH RESET BUTTON ON CASTING TEMP
SAFETY SWITCH. CHECK CONTINUITY OF
CASTING TEMP. SAFETY SWITCH CONTACTS.
CONACTS OPEN OR CLOSED?
CLOSED
REPLACE/REPAIR WIRING FROM
TRANSFORMER TO IBC
NO
REPLACE IBC
NO REPLACE/REPAIR WIRING FROM IBC TO
CIRCULATOR
OPEN
REPLACE CAST. TEMP.
SAFETY SWITCH.
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