Troubleshooting: Heating Sequence of Operation (Continued)
CALL FOR SECOND−STAGE HEAT
2
| CALL FOR 2ND STAGE HEAT | 1 |
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| (HIGH FIRE) |
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| 2 STAGE THERMOSTAT | |||
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| RECOGNITION DELAY | |||
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| (30 SECONDS) | ||
ONLY FOR 1ST EXPIRED? | ||||
REQUEST FOR |
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2ND STAGE HEAT |
| YES |
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SINGLE STAGE THERMOSTAT 2
2ND STAGE ON DELAY EXPIRED?
YES
INDUCER SWITCHED
TO HIGH SPEED
HIGH |
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PRESSURE SWITCH |
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| INDUCER SWITCHED |
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| NO |
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CLOSED WITHIN 10 |
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| TO LOW SPEED |
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SECONDS? |
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YES
2ND STAGE GAS VALVE
ENERGIZED
INDOOR BLOWER ENERGIZED
ON HIGH HEAT SPEED
3
CALL FOR HEAT SATISFIED
5 MINUTE DELAY | 3 |
(ERROR CODE FLASHES) |
1SYSTEM WILL ALWAYS LIGHT ON LOW FIIRE, EVEN IF 2ND STAGE HEAT IS IN PLACE.
2WHEN USED WITH A SINGLE STAGE THERMOSTAT, SET SW1 TO THE ON POSITION IN DIP SWITCH S4.
3IF THE HIGH FIRE PRESSURE SWITCH DOES NOT CLOSE WITHIN 5 ATTEMPTS, THE SYSTEM WILL OPERATE AT LOW FIRE FOR THE REMAINDER OF THE CALL FOR HEAT REQUEST.
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