
Troubleshooting Guide
Reset failure
1. Reset switch was pressed too long. Try to reset again.
2. Reset switch is shorted. Replace switch.
Proper Electrode Location
Proper location of the electrode assembly is important for optimal
system performance. The electrode assembly should be located
so that the tips are inside the flame envelope and about 1/2 inch
[1.2 cm] above the base of the flame. Refer to
Figure 43
.
TMB2317K_SVG
Figure 43
Flame Current Measurement
Flame current is the current that passes through the flame from
sensor to ground. To measure flame current, connect a True RMS
or analog DC micro-ammeter to the FC+ and the FC- terminals.
The reading should be 1.0 micro-amps DC or higher. If the meter
reads negative or below “0” on the scale, the meter leads are re-
versed. Re-connect leads with proper polarity.
Alternately, a Digital Voltmeter may be used to measure the DC
voltage between the FC+ and FC- terminals. Each micro-amp of
flame current produces 1.0 VDC, so a reading of 2.6 VDC would
equate to 2.6 micro-amps.
A good burner ground that matches the control ground is critical
for reliable flame sensing.
Ignition Control Operation for Non-CE
Models Through 3/10/13
Power Up
When power is applied to the ignition control, the control will be-
gin the ignition sequence within 1 – 3 seconds prepurge waiting
time.
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
Operating Instructions
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Copyright, Alliance Laundry Systems LLC -
DO NOT COPY or TRANSMIT
75
Part No. 70458101ENR10
Содержание XT170L
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