79 PB
COMPONENTS TESTING
Indoor Fan Motor
Indoor DC Fan Motor
Outdoor DC Fan Motor
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation. Extreme care must be used, if it
becomes necessary to work on equipment with
power applied.
Failure to do so could result in serious injury or
death.
Power Check:
1. Turn unit on.
2. Check indoor fan connector on main PCB.
See Indoor Unit Main PCB Terminal ID
There are 5 wires:
Voltage for Power (Red) to Ground (Black) = 310 VDC
Motor Return Voltage (White) to Ground (Black) = 15 VDC
PWM (Yellow) to Ground (Black) = 0-6.5 VDC
3. DC Voltage test
Manually rotate indoor fan motor slowly for several revolutions, and
measure voltage “YELLOW” and “GND” on motor. The voltage repeats 0V
DC and 5V DC.
Notes:
• Do not hold motor by lead wires.
• Do not connect or disconnect the molex connecter while power ON.
• Do not drop motor against hard material. Malfunction may not be
observed at early stage after such shock. But it may be found later, this
type of mishandling voids our warranty.
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