SEQUENCE OF OPERATION - HEDV403/4
@t=0 |
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THERMOSTAT |
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| Thermostat |
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CALLS FOR |
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| t=10 sec. | t=15 sec. | t=20 sec. | t=50 sec. | is satisfied |
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HEAT |
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| t=x sec. | t=X+15 sec. | t=X+120 sec. | ||||
Power to | Fan | YES | Power to | Gas | IGNITION YES | Blower | Burners | Combust. | Blower |
Combust. | Proved |
| Ignitor | Flow | PROVED? | On | Off | Fan Off | Off |
Fan |
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| NO |
| NO |
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| NO |
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10 SEC |
| YES | Three | 10 SEC |
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Lockout | Attempts |
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| PURGE |
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PURGE |
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NO Three | YES |
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Attempts |
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Made? |
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STEP #
1)Thermostat calls for heat.
2)Combustion fan turns on.
3)Pressure switch closes.
4)Power to Ignitor.
5)Ignitor warm up period.
6)Gas flow to burner.
7)Burner ignition proven.
8)Circulating blower on. NOTE: If there is a mal- function in any of the above steps, the sequence will stop at that point and
STEP #
8) Continued...
return to Step 2. If after 3 attempts malfunction still occurs, furnace will go into lockout mode for one hour. This one hour mode can be bypassed by resetting thermostat.
9)Thermostat satisfied.
10)Gas valve closes.
11)Combustion fan off.
12)Blower off.
HEATER NOW IN
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