HEATINGSEQUENCECONTINUED
| NORMAL | HEATING MODE |
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| ABNORMAL | HEATING | MODE | ||||||||
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| GAS VALVE OFF. COMBUSTION AIR | ||||||
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| AND INDOOR BLOWER OFF. | J- | |||||
| IGNITION | SEQUENCE BEGINS |
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| ALTERNL%t"%F SRES/ | ||||||||||
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| (Ignition | tfiatcounter initiated.) |
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| WATCHGUARD |
| - FLAME | FAILURE. | |||
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| IGNITOR(20 |
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| COMBUSTION |
| AIR INDUCER | OFF. | ||||
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| INDOOR |
| BLOWER | OFF, |
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| LED | #1 | & LED #2 | ALTERNATE | FLASH, | |||||
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| WETIMEDMODE | I I |
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| VALVE OFF. |
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CALLFOR Ist STAGEHEAT j | L | SINGLE STAGET'STAT j | L |
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| HIGH HEAT ONLY | j |
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MAIN GAS VALVE OPEN |
| MAIN | GAS VALVE OPEN |
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| CONTROL | CHECKS | RETRY |
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| GAS VALVE OPEN |
| FOR | IGNmON | COUNT |
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LOW HEATONLY |
| LOW HEATONLY |
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| HIGH AND LOW HEAT |
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(Ignitorremains energized,) |
| (IgNitor | remains energized, |
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| (ignitor remains energized,) |
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| 4 SECONDS_ |
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FLAME RECTIFICATION CURRENT CHECK | J |
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| I > | 0.15 microamps) |
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I | (ResponseE |
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I | INDOOR BLOWER ON DELAY BEGINS | I |
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3__ |
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| W'2TIMEDMOOE | I | I |
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CALLFOR Ist STAGEHEAT J L |
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| SINGLESTAGET'STAT | JL | HIGH HEATONLY j |
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INDOOR BLOWER ON LOW SPEED, | INDOOR BLOWER ON HIGH HEATING I |
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ACC. TERM NAL ENERG ZES | SPEED, ACC, TERM NAL ENERGIZES. I |
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I | FLAME PRESENT? | I |
!Continuous flame check) | I | |
1 | FLAME SIGNAL | _ |
( > 0.7 microamps) | ||
I | PRIMARY LIMIT SWITCH CLOSED? |
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I | ROLLOUT SWITCH CLOSED? |
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I | PRESSURE SWITCH CLOSED? |
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ICONTtNUED ON NEXT PAGE) |
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CONTINUED ON NEXT PAGE
NO
LEDLOWFLAMEB,GNAL#1 - SLOW FLASH
LED #2 - FAST FLASH
COMBUSTION AIR INDUCER
INDOOR BLOWER ON.
GAS VALVE
LED #1 - SLOW FLASH; LED #2 - ON.
t
J | HAS THREELIMITCLOSEDMINUTES?WITHIN |
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COMBUSTION AIR INDUCER DE*ENERGIZED. |
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INDOOR BLOWER OFF DELAY (Selected time) |
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| GAS VALVELED | I |
LED #2 - SLOW FLASH
Page 29
