Proper Electrode Location; Flame Current Measurement; Ignition Control Operation For Non-Ce Models Through 3/10/13 - ALLIANCE CA050L Installation Operation & Maintenance

Troubleshooting Guide
Control does not start, green LED is off
Thermostat on, no spark or valve
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 61 .
Figure 61

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.
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DO NOT COPY or TRANSMIT
1. 24 VAC present between 24V and ground on 70458701 only.
If not, see machine schematic.
2. 24 VAC present between TH and ground. If not, see machine
schematic.
1. Cable connects to control and electrode. Voltage present at
gas valve.
2. Bad control. Check red LED for steady on or flashing codes.
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.
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
TMB2317K_SVG
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.
87
Operating Instructions
Part No. 70457901ENR12