Ignition Control Operation For Ce Models Through 3/10/13 - ALLIANCE CA050L Installation Operation & Maintenance

Operating Instructions
Ignition Sequence
The control begins the ignition sequence after prepurge by pow-
ering the ignitor and opening the gas valve. The ignitor will re-
main 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 ignitor will be powered
up again in an attempt to re-ignite the gas.
If no flame is detected within the ten (10) second ignition se-
quence, the control will terminate power to the gas valves, igni-
tor, 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 nor-
mal power up and ignition sequence.
Low Voltage Detection
The control will have capability for detection of a low voltage in-
put 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.
Ignition Control Operation for CE Mod-
els Through 3/10/13
Power Up
After 24VAC is applied to the ignition control pins 24V and
GND, the Diagnostic LED on the ignition control will turn or-
ange/yellow. If a fault is detected the ignition control will enter
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Lockout Mode. If no faults are detected, the Diagnostic LED will
turn Green and the ignition control will enter Standby Mode.
Standby Mode
While in Standby Mode, the ignition control will continually
monitor the system for faults. Once 24VAC is applied to termi-
nals TH and GND on the control, the ignition control will enter
Start Up Mode.
Start Up Mode
During Start Up Mode, the ignition control will monitor the sys-
tem for faults and begin the ignition sequence. If no faults are
present, the ignition control will begin the ignition sequence by
entering an 18 second waiting period. During this time the Green
LED on the ignition control will switch between Red and Green,
before maintaining a Green color.
After the waiting period, the ignition control will turn on the ig-
niter and gas valve. The igniter will remain on until a flame is
sensed, or up to 10 seconds.
Once a flame has been sensed the ignition control will stop spark-
ing, the gas valve will remain on and ignition control will enter
Run Mode.
If a flame is not sensed, the ignition control will then begin two
additional retrials for ignition. The ignition control will re-enter
the 18 seconds waiting period before the ignition control makes
another attempt at ignition. If the three attempts at ignition fail,
the ignition control will enter Lockout Mode.
Run Mode
While in Run Mode the ignition control leaves the gas valve on,
monitors the flame signal, and leaves the igniter off.
If a flame signal is lost during Run Mode, one additional retrial
for ignition will take place within one second. The ignition con-
trol will restore the spark for approximately 10 seconds. If the ig-
nition re-attempt fails, the ignition control will enter Lockout
Mode.
The ignition control will remain in Run Mode until 24VAC is re-
moved from terminals TH and GND on the control.
Termination of Flame
The flame will go out when power is removed from ignition con-
trol. The ignition control will turn off the gas valve and enter
Standby Mode.
Lockout Mode
When Lockout Mode is entered, the ignition control will remove
power to the gas valve, the igniter will turn off, the Lockout/
Reset Light will turn on, and the Diagnostic LED will display the
appropriate Error Code.
Lockout Manual Reset
Lockout Mode is cleared by pressing an external reset switch for
three seconds. The ignition control will clear all error codes and
88 Part No. 70457901ENR12