Goodman ACVC96 BA Series Service And Troubleshooting page 45

SERVICING
HIGH VOLTAGE
D ALL
ISCONNECT POWER BEFORE SERVICING OR
CHANGING ANY ELECTRICAL WIRING.
F
SOURCES MAY BE PRESENT. AILURE TO DO SO MAY CAUSE
PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
To use the diagnostic tool, perform the following steps:
1. Disconnect power to the furnace.
2. Disconnect the 4-circuit control harness from the motor.
3. Plug the 4-circuit connector from the diagnostic tool into
the motor control connector.
4. Connect one alligator clip from the diagnostic tool to a
ground source.
5. Connect the other alligator clip to a 24VAC source.
NOTE: The alligator clips are NOT polarized.
NOTE: The UltraCheck-EZ
a non-replaceable fuse. Connecting the tool to a source
other than 24VAC could damage the tool and cause the fuse
to open. Doing so will render the diagnostic tool inoperable.
6. Turn on power to the furnace.
L
INE VOLTAGE NOW PRESENT
7. Depress the orange power button on the diagnostic tool
to send a run signal to the motor. Allow up to 5 seconds
for the motor to start.
NOTE: If the orange power button does not illuminate when
depressed, the tool either has an open fuse or is not properly
connected to a 24VAC source.
8. The green LED on the diagnostic tool will blink indicating
communications between the tool and motor. See table
below for indications of tool indicators and motor actions.
Replace or repair as needed.
Power Green
Button LED
OFF OFF
Rotating
ON Blinking Rotating
ON OFF Rotating
ON Blinking
Rotating
ON OFF
Rotating
WARNING
M
ULTIPLE POWER
diagnostic tool is equipped with
TM
WARNING
Motor
Indication(s)
Action
Confirm 24VAC to
TM
UltraCheck-EZ
Not
If 24VAC is confirmed,
diagnostic tool is
inoperable.
Motor and control/end
bell are functioning
properly.
Replace motor
control/end bell.
Not Check motor (see
Motor Check s below).
Replace motor
Not control/end bell; verify
motor (see Motor
Check s below).
9. Depress the orange power button to turn off motor.
10. Disconnect power. Disconnect diagnostic tool.
11. Reconnect the 4-wire harness from control board to motor.
Electrical Checks - High Voltage Power Circuits
HIGH VOLTAGE
D
ISCONNECT
CHANGING ANY ELECTRICAL WIRING.
SOURCES MAY BE PRESENT.
PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
1. Disconnect power to the furnace.
2. Disconnect the 5-circuit power connector to the ECM motor.
3. Turn on power to the furnace.
L
INE VOLTAGE NOW PRESENT
4. Measure voltage between pins 4 and 5 on the 5-circuit
connector. Measured voltage should be the same as the
supply voltage to the furnace.
tool.
5. Measure voltage between pins 4 and 3. Voltage should
be approximately zero.
6. Measure voltage between pins 5 and 3. Voltage should
be the same as the supply voltage to the furnace.
WARNING
ALL
POWER BEFORE SERVICING OR
M
ULTIPLE POWER
F
AILURE TO DO SO MAY CAUSE
WARNING
AC Line Hot Connection
5
AC Line Neutral Connection
4
Gnd
3
}
2
Lines 1 and 2 will be connected
for 120VAC Power Connector
1
applications only
POWER CONNECTOR
(1/2 HP MOTORS)
"Motor Half"
(Viewed from Plug End)
inductor
AC Line Hot Connection
5
AC Line Neutral Connection
4
Gnd
3
}
2
Lines 1 and 2 will be connected
for 120VAC Power Connector
1
applications only
POWER CONNECTOR
(3/4 & 1 HP MOTORS)
"Motor Half"
(Viewed from Plug End)
45