Proper Ground And Voltage - Lennox EL296UH045XE36B Unit Information

I- Proper Ground and Voltage
Furnace must be properly grounded for proper perform­
ance. 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 read­
ings exceed the maximum shown in table 26, make re­
pairs 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 53. 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 53
Page 48
TABLE 26
Measurement VAC
Expected Maximum
0.3
0.75
Less than 2
2
5
10