20
OIl PRIMARY cONTROl - sequeNce Of OPeRATION
Oil Primary control Detailed sequence of Operation
Power is applied to unit. The oil primary control completes a self-
diagnostic procedure. If no light or flame is present, and unit passes
its self-diagnostic procedure, the control enters into the idle mode.
Thermostat calls for heat:
Safety check is made for flame (4 second delay).
1.
If flame is not present, the oil primary control will apply
A.
power to the burner motor and igniter.
If flame is present, the control remains in the idle state.
B.
Unit enters a pre-purge period of 15 seconds.
2.
After 10 seconds, control checks for flame presence.
3.
If flame is not present, the oil primary control enters the
A.
trial for ignition state.
When flame is present, the control enters lock out mode.
B.
The Oil Primary Control monitors the burner flame.
4.
When flame is present, the control enters ignition carry-
A.
over state. (Continues to spark for 10 sec.).
Provides continuous spark after flame 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 flame is lost and lockout timer has not expired,
the control will return to trial for ignition state.
■ If flame 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 off.
LED diagnostic light flashes slowly.
•
Carryover timer expires.
5.
Enters run state.
A.
Igniter turns off.
•
Combustion continues until thermostat is satisfied, or the oil pri-
mary control detects a loss of flame and enters into Recycle Mode.
Thermostat is satisfied - call for heat is terminated:
6.
Oil primary control shuts off burner motor and solenoid
A.
valve.
If the control utilizes a blower motor off delay, after 30
•
seconds, flame presence is checked.
■ If flame is not present, the control LED diagnostic
light is off and returns to idle state.
■ If flame is presence is detected, the control enters
lock out mode.
Summary of Contents for HTL-90D
Page 18: ...18 Wiring Diagrams Figure 6 Chimney Vent Burner Wiring Diagram HTL D HTLV D...
Page 22: ...22 Oil Primary Control Sequence of Operation...
Page 31: ...31 Homeowner s Reference Table...
Page 33: ...33 PARTS LISTING HIGHBOY MODEL HTL D AND HTLV D Figure 9 Model HTL D and HTLV D...
Page 34: ...34 HTL D HTLV D Oil Fired Warm Air Furnace NOTES...
