Utica Boilers UB90-200 설치 설명서

RUNS FOR 25-50 SECONDS, 

THEN TURNS OFF.

CHECK FIRING RATE OF UNIT.

IS UNIT FIRING AT THE CORRECT RATE?

NO

DOES THE UNIT USE LP GAS.

YES

NO

CHECK GAS ORFICICE SIZE.

IS GAS ORIFICE SIZE CORRECT.

CHECK REPAIR PARTS LIST 

FOR CORRECT SIZE. IS GAS ORIFICE 

CLEAR OF BLOCKAGE.

ADJUST RATE AS DESCRIBED IN THE 

CHECK OUT PROCEDURE AND 

ADJUSTMENT SECTION

OF THE MANUAL.

CHART 5

NO #2

YES

CHECK BURNER FOR ANY DETERIORATION 

IN THE FLAME PORTS. ARE BURNER PORTS 

IN GOOD CONDITION.

NO

REPLACE WITH CORRECT 

AIR BAFFLE.

YES

CHECK FLAME SIGNAL > 0.6uA?

CONSULT BOILER MFGR. FOR 

SPECIFIC INSTRUCTIONS. REQUIRES 

SPECIFIC TOOLS.

NO

YES

REPLACE BURNER

REPLACE IBC

BOILER SHUTS OFF BEFORE END OF 

CALL FOR HEAT. ARE HI LIMIT 

AQUASTAT CONTACTS CLOSED?

NO

BOILER OFF ON HIGH LIMIT. IS 

ACTUAL BOILER WATER TEMP.

GREATER THAN HI LIMIT SET POINT 

MINUS 30°F CONTROL DIFFERENTIAL?

NO

NO

REPLACE

AQUASTAT

OK

YES

SEE TROUBLESHOOTING PATH 

#2 ABOVE

CHART 5

NO #3

CHART 5

YES

SET THERMOSTAT BELOW ROOM 

TEMPERATURE TO END CALL FOR 

HEAT

DOES CIRCULATOR PUMP STOP?

NO

ARE THERMOSTAT CONTACTS OPEN?

REPLACE THERMOSTAT

NO

YES

REPLACE IBC

YES

REMOVE WIRING HARNESS 

CONNECTION CN9 FROM GAS 

CONTROL DOES GAS CONTROL 

CLOSE?

NO

REPLACE GAS CONTROL

NO

YES

YES

DOES DRAFT BLOWER 

STOP AFTER 30 

SECOND POST PURGE?

NO

REPLACE IBC

YES

YES

SYSTEM OK 

YES

REPLACE GAS CONTROL.