Servicing - Goodman ACVC96 BA Series Service And Troubleshooting

SERVICING

Some of the electronic boards being used today, with flame
rectification, will not function properly and/or at all without
polarization of incoming power. Some also require phasing
between the primary and secondary sides of step-down
transformers.
CHECKING FOR PHASING - PRIMARY TO SECONDARY OF UNMARKED TRANSFORMERS*
METER READS
24 VOLTS
.
C
R
If meter reads approximately 96 volts - the primary to secondary are in phase - if reads approximately 144 volts out of phase
- reverse low voltage wires.
C
24 V
R
PHASING SYMBOL
42
METER READS
120 VOLTS
.
TRANSFORMER
LINE VOLTAGE
(NEUTRAL)
GND
LINE VOLTAGE
L1 (HOT)
.
NEUTRAL
120 V
L1
INCOMING POWER
120.00
THIS IS L1 OR THE
HOT POWER LEG
READS 144 VOLTS - OUT OF PHASE
These then should be wired to the furnace accordingly.
Some transformers will display phasing symbols as shown
in the illustration to the left to assist in determining proper
transformer phasing.
0.00
THIS IS THE COMMON
OR NEUTRAL LEG
GND
N
C
R
L1
.
READS 96 VOLTS - IN PHASE
GND
N
C
R L1
.