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OIL PRIMARY CONTROL SEQUENCE OF OPERATION
Oil Primary Control Led Diagnostic Light
e LED diagnostic light has several functions. It indicates the state
or mode in which the oil burner is operating. It will also indicate
fault conditions, and help determine cad cell resistance while the
burner is operating. Please refer to included burner manual for more
details.
Normal Conditions:
e LED diagnostic light will turn on when the burner enters the
carryover state; the point at which ignition spark is on, and will
remain on through the run state, where the ignition spark is termi-
nated but the burner continues to re.
e LED diagnostic light will turn o at the end of the burner cycle
as the oil primary control enters the idle state, and will remain o
until the next heating cycle.
Fault Conditions:
If the LED diagnostic light is ashing quickly; 1 Hz (½ second on
/ ½ second o), the oil primary control is in the lockout state or in
restricted mode. To exit the lockout state, press the reset button.
If the LED diagnostic light is ashing slowly; ¼ Hz (2 seconds on
/ 2 seconds o), the oil primary control is in the recycle state. is
indicates that ame sensing was lost aer the lockout timer expired
during the ignition carryover state. e oil primary control will
return to the idle state within 60 seconds.
Cad Cell Condition:
If the LED diagnostic light is o, the cad cell is not sensing ame.
If the LED diagnostic light is on, the cad cell is sensing ame, or
viewing ambient light.
e resistance of the cad cell may be checked while the oil primary
control is in the run state by pressing the reset button. e LED
diagnostic light will ash the following code:
Table 10: Cad Cell Resistance
Flashes Resistance in Ohms
1 Less than 400
2 Between 400 - 800
3 Between 800 – 1600
4 Between 1600- 5000
Troubleshooting
NOTICE
IMPORTANT: Due to the potential hazard of line volt-
age, only a trained, experienced service technician should
perform the troubleshooting procedure.
Preliminary Steps:
Check the diagnostic light for indications of burner condition. Refer
to the oil primary control LED DIAGNOSTIC LIGHT section for
details.
!
CAUTION
WHEN SIMULATING A CALL FOR HEAT AT THE OIL
PRIMARY CONTROL, DISCONNECT AT LEAST ONE
THERMOSTAT LEAD WIRE FROM THE T1 - T2 TER-
MINALS TO PREVENT DAMAGE TO THE THERMO-
STAT. NEGLECTING THIS PROCEDURE MAY BURN
OUT THE HEAT ANTICIPATOR OF A STANDARD 24
VAC THERMOSTAT, OR CAUSE HARM TO COMPO-
NENTS WITHIN A MICRO-ELECTRONIC THERMO-
STAT.
Before checking the oil primary control, perform these preliminary
checks, (repair or replace controls as necessary):
Check the power supply; fuse box or breaker, any service •
switches, all wiring connections, and burner motor reset
button (if equipped).
Check the limit switches to ensure that the switch contacts •
are closed.
Check the electrode gap and position.•
Check the contacts between the oil primary control and the •
electrodes.
Check oil supply (tank gauge).•
Check the oil nozzle, oil lter, and oil valves.•
Check the piping or tubing to the oil tank.•
Check the oil pump pressure.•
Check Oil Primary Control And Igniter
If the trouble does not appear to be in the burner or ignition hard-
ware, check the oil primary control and the igniter by using the
following equipment:
Screwdriver.
Voltmeter (0 - 150 VAC)
Insulated jumper wires with both ends stripped.
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