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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.
Room temperature between 34 F and 61 F = 6 minutes
Room temperature below 34 F = 9 minutes
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
, • [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
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
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