Lennox EL296DFE Series Manual page 48

I- Proper Ground and Voltage
Furnace must be properly grounded for proper perfor-
mance. 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 figure
53. 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 26, make repairs before operating
the furnace
CHECK VOLTAGE BETWEEN LINE NEUTRAL
AND LOW VOLTAGE "C" TERMINAL
2 - In addition, measure the AC voltage from Line Hot to
Line Neutral (spade terminals) on the integrated con-
trol. See figure 54. This voltage should be in the range
of 97 to 132 Vac.
Furnace Status
Power On Furnace Idle
CAI / Ignitor Energized
Indoor Blower Energized
CHECK VOLTAGE BETWEEN LINE HOT
AND LINE NEUTRAL
FIGURE 54
Page 48
TABLE 25
Measurement VAC
Expected Maximum
0.3
0.75
Less than 2
2
5
10