Lennox EL196UH030XE24B 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 ig­
nitor 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 figure 58. 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 read­
ings exceed the maximum shown in table 1, make re­
pairs 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 con­
trol. 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 22
Measurement VAC
Expected Maximum
0.3
0.75
Less than 2
2
5
10