Lennox EL196UHE Series Information page 46

G- Proper Ground and Voltage
WARNING
Electric Shock Hazard. Can cause injury
or death. Unit must be properly grounded
in accordance with national and local
codes.
A poorly grounded furnace can contribute to premature
ignitor failure. Use the following procedure to check for
ground and voltage to the integrated control.
1 - Measure the AC voltage between Line Neutral
(spade terminals) and "C" terminal (low voltage
terminal block) on the integrated control. See . A
wide variation in the voltage between Line Neutral
and "C" as a function of load indicates a poor or
partial ground. Compare the readings to the table
below. If the readings exceed the maximum shown
in TABLE 21, make repairs before operating the
furnace.
CHECK VOLTAGE BETWEEN LINE NEUTRAL
AND LOW VOLTAGE "C" TERMINAL
Red LED
Recall
2 - In addition, measure the AC voltage from Line Hot
to Line Neutral (spade terminals) on the integrated
control. See FIGURE 58. This voltage should be in
the range of 97 to 132 Vac
Note - FIGURE 58 is a typical ignition control
illustration.
Furnace Status
Power On Furnace Idle
CAI / Ignitor Energized
Indoor Blower Energized
CHECK VOLTAGE BETWEEN LINE HOT
AND LINE NEUTRAL
Red LED
Recall
FIGURE 58
Page 46
TABLE 21
Measurement VAC
Expected Maximum
0.3
0.75
Less than 2
2
5
10