Assessments - 4, GPA: 4 ( )

Fabricante : Lennox International Inc. Arquivo Tamanho: 2.2 mb Arquivo Nome : Língua de Ensino:

Limit must close within 3 minutes or unit goes into 1-hour Watchguard. Pressure switch open; OR: Blocked inlet/exhaust vent; OFF SLOW FLASH OR: Condensate line blocked; OR: Pressure switch closed prior to activation of combustion air inducer. ALTERNATING ALTERNATING Watchguard --Burners failed to ignite, limit open longer than 3 minutes, or flame SLOW FLASH SLOW FLASH sense lost 5 times in one heating cycle. SLOW FLASH OFF Flame sensed without gas valve energized. ON SLOW FLASH Rollout switch open. ON ON Circuit board failure or control wired incorrectly. Check 24-volt and 115-volt ON OFF connections to board. OFF ON FAST FLASH SLOW FLASH Main power polarity reversed. Switch line and neutral. Improper main ground. SLOW FLASH FAST FLASH Low flame signal. Check flame sensor. The following conditions are sensed during the ignitor warm-up period only: ALTERNATING ALTERNATING 1) Improper main ground; FAST FLASH FAST FLASH 2) Broken ignitor; OR: Open ignitor circuit; 3) Line voltage below 75 volts. NOTE -Slow flash rate equals 1 Hz (one flash per second). Fast flash rate equals 3 Hz (three flashes per second). Drop out flame sense current = 0.15 -0.24 microAmps. Page 30 SURELIGHT ®CONTROL HEATING SEQUENCE OF OPERATION NORMAL HEATING MODE ABNORMAL HEATING MODE I POWER ON ] I GAS VALVE OFF. COMBUSTION AIR INDUCER ON. _' I INDOOR BLOWER ON. CONTROL SELF-CHECK OKAY'_ I,_ _ LED #1 ALTERNATING FAST FLASH I " ; NO | LED#2 ALTERNATING FAST FLASH I | CHECK FOR BROKEN IGNITOR OR -I GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. v aYES _ INDOOR BLOWER DELAY OFF. ,sPOLARITYREVERSED? _1 I #1 LEDON I i-I I I LED#2ON I I NO /I I (R__ TURNING MAIN POWER OFF) LED#1 AND LED#2 / ALTERNATING FAST J_ 1' _ POLARITY REVERSED. FLASH, SIGNAL NO • I LED #1 --FAST FLASH HOLDS UNTIL UNIT IS| ._--I ISTHERE I YESI ISVOLTAGE I NO I LED #2 --SLOW FLASH PROPERLY GROUNDi_I PROPER GROUND? _ ABOVE 75VOLTS? I_-----I ' --' /II _I LED#1LED#2FASTI YESANDALTERNATING • NO I'--ml FLASH. SIGNAL HOLDS UNTIL VOLTAGE I _I ROLLOUT SWITCH CLOSED? _ I_ I RISES ABOVE 75 VOLTS. I YESi in,- | I1"I"1 GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. '_ _1 INDOOR BLOWER OFF WITH DELAY. GAS VALVE I I LED #1 --ON. LED #2 --SLOW FLASH, I DE-ENERGIZED? I ISEQUENCE HOLDS UNTIL ROLLOUT SWITCH CLOSES. YEs_ LED #1 --SLOW FLASH NORMAL OPERATION: I LED #2 --SLOW FLASH THERMOSTAT CALLS FOR HEAT: I LED #1 --FAST FLASH II LED #2 --FAST FLASH YES COMBUSTION AIR INDUCER OFF. i i NO INDOOR BLOWER OFF WITH DELAY. LED #1 OFF PRESSURE SWITCH OPEN? 14 IS COMBUSTION AIR I LED #2 SLOW FLASH GAS VALVE OFF. YES _1 (Sequence holds until pressure switch closes or thermostat resets control,) I IS COMBUSTION AIR INDUCER ENERGIZED? (HUM TERMINAL IS ENERGIZED WITH C.A.I.) 4 PRESSURE SWITCH IS IN WATCHGUARD MODE. GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. HASSWITCHCOMBUSTIONCLOSED AIR PRESSURE INDOOR BLOWER OFF WITH IN 2.5 MINUTES? DELAY, 1_ LED #1 --OFF. LED #2 --SLOW FLASH, YES IS 5-MINUTE RESET PERIOD COMPLETE? 15-SECOND COMBUSTION AIR INDUCER PREPURGE I | N T ATED BY CLOSED PRESSURE SW TCH. I m YES CONTINUED NEXT PAGE Page 31 NORMAL HEATING MODE ABNORMAL HEATING MODE 15-SECOND COMBUSTION AIR INDUCER PREPURGE 9 N T ATED BY CLOSED PRESSURE SW TCH. YES _ -_O S VOLTAGE ABOVE 75 VOLTS? YES_ . NO I LEDS SIGNAL I IGNITOR WARM-UP --20 SECONDS. ALTERNATING FAST FLASH YES YES_t INOI _IIW ISTHERE A PROPER GROUND? I--=-_l ISIGNITOR INTACT AND CONNECTED?I_"I GAS VALVE OPENS, IGNITOR ENERGIZED FOR I 4-SECOND TRIAL FOR IGNITION. UP TO 4 SECONDS, INDOOR BLOWER OFF. I HAS CONTROL FA LED TO SENSE FLAME FOR NO YES FIVE CONSECUTIVE TRIES DURING A SINGLE I FLAME STABILIZATION PERIOD. I HEAT DEMAND? 4 SECONDS t FLAME RECTIFICATION CURRENT CHECK. CAN FLAME BE PROVEN WITHIN COMBUSTION AIR INDUCER OFF. | 4 SECONDS AFTER GAS VALVE OPENS? I GAS VALVE OFF. COMBUSTION AIR INDUCER ON. I_ IGNITIONINDOORWATCHGUARDBLOWER MODE.OFF WITH I GAS VALVE OFF. DELAY YES ( > 0.24 microamps) LED 1 ALT. SLOW FLASH LED 2 ALT SLOW FLASH I I IS 60-MINUTE RESET PERIOD COMPLETE? I,.__ I YES _ _,Z_._I NO HASRESET CONTROL,GN,T,ON FLAME PRESENT? I I SEQUENCE FOUR TIMES? / Ii YES _ LOW FLAME SIGNAL (Does not affect operation of control) I FLAME SIGNAL ABOVE 0.31 MICROAMPS? YES l LED #1 --SLOW FLASH YES _ LED #2 --FAST FLASH -I LIMIT SWITCH WATCHI GUARD MODE. GAS I INDOOR BLOWER ON DELAY BEGINS GAS VALVE DE-ENERGIZED VALVE OFF. COMB. AIR (45 seconds,) COMBUSTION AIR INDUCER INDUCER OFF. INDOOR YES _1 DE-ENERGIZED.INDOOR BLOWER BLOWER OFF WITH ON UNTIL SWITCH CLOSES.LED #1 DELAY, LED#I-SLOW PRIMARY AND SECONDARY CLOSED? --SLOW FLASH, LED #2 --ON. FLASH LED#2 -ON. IS IS LIMIT SWITCH CLOSED? 60MINUTE RESET PERIOD COMPLETE? SWITCHES LIMIT F YES HAS PRIMARY/SECONDARY LIMIT YES RESET (CLOSED) WITHIN 3 YES MINUTES? NO GAS VALVE POWER OFR COMBUSTION AIR INDUCER POWER OFF. I ROLLOUT SWITCH CLOSED? INDOOR BLOWER OFF WITH DELAY LED #1 --ON. LED #2 --SLOW FLASH, YES _ SEQUENCE HOLDS UNTIL ROLLOUT SWITCH IS RESET q .1 COMBUSTION AIR PRESSURE SWITCH CLOSED? YES YES _ COMB...

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