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 gure
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
2 - In addition, measure the AC voltage from Line Hot to
Line Neutral (spade terminals) on the integrated con-
trol. See gure 54. This voltage should be in the range
of 97 to 132 Vac.
TABLE 25
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
FIGURE 54
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