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OIL PRIMARY CONTROL SEQUENCE OF OPERATION
Oil Primary Control Detailed Sequence of Operation
Power is applied to unit. e oil primary control completes a self-
diagnostic procedure. If no light or ame is present, and unit passes
its self-diagnostic procedure, the control enters into the idle mode.
ermostat calls for heat:
Safety check is made for ame (4 second delay).
1.
If ame is not present, the oil primary control will apply A.
power to the burner motor and igniter.
If ame is present, the control remains in the idle state.B.
Unit enters a pre-purge period of 15 seconds.
2.
Aer 10 seconds, control checks for ame presence.
3.
If ame is not present, the oil primary control enters the A.
trial for ignition state.
When ame is present, the control enters lock out mode. B.
e Oil Primary Control monitors the burner ame.
4.
When ame is present, the control enters ignition carry-A.
over state. (Continues to spark for 10 sec.).
Provides continuous spark aer ame is sensed to assure •
that burner remains lit.
Turns on LED diagnostic light.•
Starts carryover timer.•
a) Flame and call for heat are monitored.
■ If ame is lost and lockout timer has not expired,
the control will return to trial for ignition state.
■ If ame is lost and lockout timer has expired, the
control will enter the recycle state.
Recycle timer starts.•
Burner motor and igniter and solenoid •
valve are turned o.
LED diagnostic light ashes slowly.•
Carryover timer expires.
5.
Enters run state.A.
Igniter turns o.•
Combustion continues until thermostat is satised, or the oil pri-
mary control detects a loss of ame and enters into Recycle Mode.
ermostat is satised - call for heat is terminated:
6.
Oil primary control shuts o burner motor and solenoid A.
valve.
If the control utilizes a blower motor o delay, aer 30 •
seconds, ame presence is checked.
■ If ame is not present, the control LED diagnostic
light is o and returns to idle state.
■ If ame is presence is detected, the control enters
lock out mode.
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