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6
Sequence of Operation
Burner States
Standby: The burner is idle, waiting
for a call for heat.
Valve-On Delay: The igniter and
motor are on while the control delays
turning on the oil solenoid valve for
the programmed time.
Trial For Ignition: The oil solenoid
valve is energized. A fl ame should be
established within the factory set trial
for ignition time (“lockout time”).
4. Lockout: The control has shut
down for one of the following safety
reasons:
a. The trial for ignition (lockout)
time expired without fl ame being
established.
b. The cad cell detected fl ame at the
end of the Valve On Delay state.
c. The pre-set time allotment for
relighting is exceeded.
d. Failed welded relay check.
If the control detects a welded motor
contact, the motor only will cycle 5
1.
2.
3.
seconds on, 5 seconds off, 3 times
before locking out.
To reset the control from lockout
interrupt power for at least 2 seconds.
Ignition Carryover: Once fl ame is
established, the igniter remains on for
10 additional seconds to ensure fl ame
stability.
Run: The fl ame is sustained until the
call for heat is satisfi ed. The control
then switches to Motor-Off Delay,
if applicable, or it shuts down and
returns to Standby.
Relight: If the fl ame is lost while
the burner is fi ring, the control
immediately repeats the ignition
sequence. The control will continue
to Relight each time the fl ame is
lost, until it reaches a pre-set time
allotment. The control will then
go into Lockout instead of Relight.
This feature prevents excessive
accumulation of oil in the equipment’s
combustion chamber.
Motor-Off Delay: If applicable, the oil
solenoid valve is turned off and the
control delays turning the motor off for
the set motor-off delay time before the
control returns to standby. Note that to
utilize the motor off delay, power must
remain to the red wire after the call for
heat ends. (Enable input turned off,
see Figure 2.)
5.
6.
7.
8.
2
1
3
5
6
8
4
7
Standby
Motor-off
delay
Valve-on
delay
Trial for
ignition
Ignition
carryover
Run
Lockout
Relight
Reset and Service by Qualifi ed
Technician only.
Fire Hazard
WARNING