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Ignition Sequence L56 73 30 OM23

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  • Ignition Sequence L56 73 30 OM23

    Maintenance Section





    L56/73
    This document indicates the step-by-step events in sequence and with time delay from the moment the heater thermistor calls for heat and starts the ignition cycle.
    Laser 56 and Laser 73 Ignition Sequence.
    • Power switch on
    • Room temperature is less than set temperature (example: set = 70, room = 68)
    • [pre-heat] Combustion Blower on high 15 seconds
    • Combustion Blower drops to low, igniter on (pre-heat cycle)
    • Pre-heat cycle timing: Room temperature above 61 F = 3 minutes

    Room temperature between 34 F and 61 F = 6 minutes
    Room temperature below 34 F = 9 minutes
    • [pre-Purge] Ignition: Combustion Blower increases to medium, medium lamp flashes, FUEL PUMP ON.
    • Medium lamp changes to solid when the flame contacts (touches) the flame sensor. If the system does not sense a flame, it will purge and start Pre-heat cycle. If system does not sense a flame during second ignition cycle, Digital Indicator will display error code EE-2.
    • Medium lamp off, low lamp on, combustion blower on low (3 min.)
    • Low lamp off, medium lamp on, circulation fan on, combustion blower on medium (3 min.)
    • After three minutes in medium burn, system checks room temperature and determines bum level: [Normal Combustion]

    Room temperature below set temperature = high bum
    Room temperature 1 degree F above set temperature = low bum
    • System shuts off when room temperature is 4 degrees F above set temperature
    Laser 30, OM23 Ignition Sequence
    • Power switch on
    • Room temperature is less than set temperature (example: set = 70, room = 68)

    , • [pre-heat] Power lamp flashes at 1 Hz, combustion blower on-low, igniter on (pre-heat)
    • Pre-heat timing: Room temperature above 59 F == 90 seconds
    Room temperature between 32 F and 59 F = 120 seconds
    Room temperature below 32 F = 240 seconds
    • [Pre-combustion] Power lamp flashes at 2 Hz, combustion blower increases to high, FUEL PUMP ON
    • Power lamp changes to solid when the flame contacts (touches) the flame sensor. If the system does not sense a flame, it will purge and start Pre-heat cycle. If system does not sense a flame during second ignition cycle, the Digital Indicator will display error code EE-2. NOTE: An EE-22 error code will occur if there are three sequential ignition failures. You must disconnect power cord for 30 minutes to erase • this code.
    • Medium bum, combustion blower in medium, circulation fan starts in 120 seconds
    • After 300 seconds in medium bum, system checks room temperature and determines bum level: [Normal Combustion]

    Room temperature below set temperature = high bum
    Room temperature 1 degree F above set temperature = low bum
    • System shuts off when room temperature is 4 degrees F above set temperature
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