Lennox EL280DF070E36A Unit Information page 20

To Measure Flame Signal - Integrated Control:
Use a digital readout meter capable of reading DC mi-
croamps. See FIGURE 16 and TABLE 9 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
Measuring Flame Signal
(upflow furnace shown)
Flame
Sensor
Wire
Integrated
Control
Remove Sensor Wire from
Integrated Control and
Connect Alligator Clip (+)
to Terminal on Control
6 - Turn supply voltage on and close thermostat con-
tacts to cycle system.
7 - When main burners are in operation for two min-
utes, take reading.
Normal
2.6 or greater
Flame Sensor
Terminal
(+)
(+) To Control
Sensor Terminal
FIGURE 16
Page 20
TABLE 9
Flame Signal in Microamps
Low
2.5 or less
Remove Sensor Wire from
Integrated Control and
Connect Alligator Clip (−)
to Frame Sensor Lead
DIGITAL METER
Set dial to measure
DC microamps
Red Collar
(+)
Indicates
Positive Leads
To Flame
Terminal
Drop Out
.06