Lennox EL280UH110P60C Unit Information page 15

To Measure Flame Signal − Integrated Control:
Use a digital readout meter capable of reading DC micro-
amps. See figure 8 and table 5 for flame signal check.
1 − Set the meter to the DC amps scale.
2 − Turn off supply voltage to control.
3 − Disconnect integrated control flame sensor wire from
the flame sensor.
4 − Connect (−) lead to flame sensor.
5 − Connect (+) lead to the ignition control sensor wire.
Flame
Sensor
Flame Sensor
Wire
Measuring Flame Signal
Integrated
Control
(+)
Remove Sensor Wire from
Integrated Control and
Connect Alligator Clip (+)
to Terminal on Control
FIGURE 8
Page 15
6 − Turn supply voltage on and close thermostat contacts to
cycle system.
7 − When main burners are in operation for two minutes, take
reading.
TABLE 5
Flame Signal in Microamps
Normal
1.9 or greater 1.4 or less
Remove Sensor Wire from
Integrated Control and
Connect Alligator Clip (−)
to Frame Sensor Lead
Flame Sensor
Terminal
(+) To Control
Sensor Terminal
Low Drop Out
.20
DIGITAL METER
Set dial to measure
DC microamps
Red Collar
(+)
Indicates
Positive Leads
To Flame
Terminal