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I- 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 54. 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 29, make repairs before oper-
ating the furnace.
2 - In addition, measure the AC voltage from Line Hot to
Line Neutral (spade terminals) on the integrated control.
See FIGURE 54. This voltage should be in the range of
97 to 132 Vac
TABLE 29
Furnace Status
Measurement VAC
Expected Maximum
Power On Furnace Idle 0.3 2
CAI/Ignitor Energized 0.75 5
Indoor Blower Energized Less than 2 10
CHECK VOLTAGE BETWEEN LINE NEUTRAL
AND LOW VOLTAGE “C” TERMINAL
CHECK VOLTAGE BETWEEN LINE HOT
AND LINE NEUTRAL
W1 W2 G
Y2
Y1
CC
RDHL ODS
W1 W2 G
Y2
Y1
CC
RDHL ODS
FIGURE 54
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