Proper Electrode Location; Flame Current Measurement; Ignition Control Operation For Non-Ce Models Through 3/10/13 - Equipment Marketers GA025L Installation Operation & Maintenance

Valve on, no spark during TFI
Spark on, no flame
Flame okay during TFI, no flame sense after TFI
Reset failure

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 51
.
Figure 51

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 reversed. Re-connect leads with proper polarity.
Part No. 70476301ENR6
Troubleshooting Guide
©
Published by permission of the copyright owner - DO NOT COPY or TRANSMIT
1. Shorted electrode.
2. Spark gap not correct. Set to .094-.156 inch.
3. High voltage cable is faulty or has a poor connection.
4. Control failure.
1. Is gas on?
2. 24 VAC at gas valve.
3. Bad control. Check voltage between gas valve terminal MV
and GND on control.
1. Check electrode position and cleanliness.
2. Check high voltage wire.
3. Poor ground at burner.
4. Poor flame, check flame current.
1. Reset switch was pressed too long. Try to reset again.
2. Reset switch is shorted. Replace switch.
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
begin the ignition sequence within 1 – 3 seconds prepurge
waiting time.
Ignition Sequence
The control begins the ignition sequence after prepurge by
powering the ignitor 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 ignitor will
be powered up again in an attempt to re-ignite the gas.
Operating Instructions
95