OPERATION AND SERVICE
ELECTRICAL SEQUENCE
1.Switch Power on to unit.
2.Thermostat calls for heat.
3.Ignition Control Board performs diagnostic check on system components.
4.On completion of diagnostics check, the Ignition Control Board energizes the Blower (Draft Inducer).
5.The Blower (Draft Inducer) begins drawing air through appliance, closing the Blower Prover Switch.
6.On completion of Blower Prover Switch engagement, the Ignition Control Board begins the ignition cycle.
7.The Ignition Control Board provides power to the Silicon Nitride Igniter.
8.The Silicon Nitride Igniter heats up for approximately 17 to 20 seconds.
9.At the end of Silicon Nitride Igniter’s
10.From the time the Gas Valve opens, the Ignition Control Board waits 3 seconds and then shuts off power to the Silicon Nitride Igniter.
11.From the time the Silicon Nitride Igniter’s power is shut off, the Ignition Control Board waits 3 more seconds to monitor the Flame Sensor.
12.If the Ignition Control Board does not detect flame at the burners, it will
for ignition. After the third failed trial for ignition, the Ignition Control Board locks out for one hour. At the end of this lock out period, the Ignition Control Board will restart at Step 3 for three more trials. NOTE: The one hour lock out period can be reset by cycling power to the water heater off and on again.
13.If the Ignition Control Board detects a strong flame from the Flame Sensor, it will remain in the heating mode until the Thermostat is satisfied.
14.When the Thermostat is satisfied, the Ignition Control Board will
Servicing should only be performed by a Qualified Service Agent
13
