508096-01 Issue 2037 Page 25 of 34
Proper Ground and Voltage
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 Figure 19. 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 Table 12. If the readings
exceed the maximum shown in Table 12, make repairs
before operating the furnace.
2. In addition, measure the AC voltage from Line Hot
to Line Neutral (spade terminals) on the integrated
control. See Figure 19. This voltage should be in the
range of 97 to 132 VAC
Furnace Status
Measurement VAC
Expected Maximum
Power On Furnace Idle 0.3 2
CAI / Ignitor Enerigized 0.75 5
Indoor Blower Energized Less than 2 10
Table 12.
CHECK VOLTAGE BETWEEN LINE NEUTRAL
AND LOW VOLTAGE “C” TERMINAL
Red LED
Recall
Red LED
Recall
CHECK VOLTAGE BETWEEN LINE HOT
AND LINE NEUTRAL
Figure 19.
To Next Page
Loading...