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Operating Instructions
70458301ENR6
96
Ignition Control Operation for
Non-CE Models Through 3/10/13
Power Up
When power is applied to the ignition control, the
control will begin the ignition sequence within 1 – 3
seconds prepurge waiting time.
Ignition Sequence
The control begins the ignition sequence after
prepurge by powering the igniter and opening the gas
valve. The ignitor will remain on either until a flame is
sensed or until a maximum of ten (10) seconds
(10 +0/-4 sec) has elapsed. If a flame is established
and lost during the 10 second period, the igniter will
be powered up again in an attempt to re-ignite the gas.
If no flame is detected within the ten (10) second
ignition sequence, the control will terminate power to
the gas valves, ignitor, and enter lockout within 5
seconds.
Normal Operation
Once a flame has been established, the spark ignitor
will stop sparking and the control will continually
monitor all inputs. If the controller senses a loss of
flame after flame is established, the gas valve will
remain energized and sparking will commence within
one second of the flame loss. If flame reattempt fails,
lockout will occur within 11 seconds of initial flame
loss.
Termination of Flame
Normal flame termination occurs when the thermostat
has been satisfied, meaning there is no immediate need
for more heat. The thermostat will disconnect power
from the ignition control, which will cause the gas
valve to close and the flame to go out. After a short
period of time, not less than 1 second, the thermostat
will cool down and close causing power to be
reapplied to the ignition control. When this occurs, the
control must complete the same prepurge and ignition
sequence specified above.
Control Lockout
When the control locks out, the gas valve will be
closed and all requests for heat will be ignored. The
lockout mode may only be discontinued by
interrupting power to the control or cycling the
thermostat. After this occurs, the control will restart
with its normal power up and ignition sequence.
Low Voltage Detection
The control will have capability for detection of a low
voltage input condition. If input voltage on power up
is below 19.0VAC +0.8VAC/-0.5VAC, the control will
disable output to gas valve control relay. If input
voltage rises above 19.8VAC for at least three (3)
seconds, the control will then re-enable function of the
gas valve control relay and ignition sequence may
begin. On powerup, the control function must always
be disabled if greater than 19.8VAC.
