14
Section 4 - Gas Supply Connection and Ignitor Operation
Ignition Sequence - P Models
The ignition sequence is a series of steps that
automatically occur to ensure the gas ignitor starts
properly before the system begins to operate. During
ignition, the following will take place:
1. The burner fan will operate to provide air flow for
combustion.
2. Once the pressure switch senses air flow, it will
energize the gas ignition module.
3. The gas ignition module turns on the gas valve and
spark electrode, igniting the gas burner to light the
wood pellets in the burn chamber.
4. The feed and burner augers run for 60 seconds,
delivering fuel to the burn chamber.
5. The gas burner will continue to burn until the burn
chamber reaches a high enough temperature to
sustain burning the wood pellets, or for 10 minutes,
at which time the controller will turn off the gas
burner.
Ignition Sequence - PE Models
The ignition sequence follows a control logic to ensure
safe and effective ignition. The ignition sequence is as
follow:
1. The water temperature must be low enough for the
furnace to shift into demand mode.
2. The fan will start and operate at the ignition fan
speed and the Firestar control will send voltage to
the igniter relay.
3. The air proving switch will close, completing the
ignition relay control circuit.
4. The electric ignitor will warm up and heat the air
blowing across it into the burn chamber.
5. The auger will cycle periodically to feed the required
amount of fuel into the burn chamber, and to agitate
any pellets already present in the burn chamber.
6. The ignitor will operate until the burn chamber
reaches a temperature that is high enough to sustain
itself, or for ten minutes, at which time the ignitor
will turn off.
