Daikin REYQ72-432XAYCU, Service Manual

Page: 450 / 482

Check SiUS371901EB
443 Part 6 Service Diagnosis
Warning
Warning
Electrical Checks - High Voltage Power Circuits
HIGH VOLTAGE!
Disconnect ALL power before servicing or installing. Multiple power sources may be present.
Failure to do so may cause property damage, personal injury or death.
Line 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
Button
Green
LED
Motor
Action
Indication(s)
OFF OFF
Not
Rotating
Confirm 24VAC to UltraCheck-EZ
TM
tool. If 24VAC
is confirmed, diagnostic tool is inoperable.
ON Blinking Rotating Motor and control/end bell are functioning properly.
ON OFF Rotating Replace motor control/end bell.
ON Blinking
Not
Rotating
Check motor (refer to Motor Checks on page 445).
ON OFF
Not
Rotating
Replace motor control/end bell; verify motor (refer to
Motor Checks on page 445).
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.
1. Disconnect power to air handler or modular blower.
2. Disconnect the 5-circuit power connector to the ECM motor.
3. Turn on power to air handler or modular.
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 air handler or modular.
5. Measure voltage between pins 4 and 3. Voltage should be approximately half of the
voltage measured in step 4.
1
2
3
4
5
Lines 1 and 2 will be connected
for 120VAC Power Connector
applications only
Gnd
AC Line Connection
AC Line Connection
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