Panasonic U-4LE1R8 Service Manual page 99

1. Outdoor Unit Control PCB
LED1, 2
(D302, D303)
Power LED
(D514)
RUN
STOP
AP
MODE
TEST
CHK
SILENT
(CN-SILENT)
CN-OPTION 1, 2
LED (red × 2)
• LED 1 and 2 blink alternately while automatic address setting is in progress.
• Display the alarm contents for alarms that are detected by the outdoor unit.
LED (green): Power indicator
Indicates the DC 5V power on the outdoor unit control PCB.
2P plug : Start pin
Short-circuit this pin and apply a pulse signal to start all indoor units in that refrigerant
system.
2P plug : Stop pin
Short-circuit this pin and apply a pulse signal to stop all indoor units in that refrigerant
system.
2P plug : Vacuuming pin
• To perform vacuuming of the outdoor unit, short-circuit this pin and then turn the
power ON. All solenoid valves turn ON and vacuuming begins smoothly. (Do not
perform automatic address setting at this time.)
• Release the short-circuit to return the unit to normal status.
2P plug : Indoor unit Heating/Cooling mode change pin
• When operating the compressors to perform automatic address setting, operation
in Heating mode can be normally used. However, short-circuiting this pin performs
operation in Cooling mode. (Static signal)
• Short-circuiting this pin during ordinary operation changes the mode from Cooling
to Heating (if the current mode is Cooling) or from Heating to Cooling (if the
current mode is Heating).
2P plug
• This pin is used to test the PCB at the factory.
• When the power is turned ON after this pin has been short-circuited, all output
signals will be output in sequence. (Sequential output does not occur if this pin is
short-circuited when the power is already ON.) Releasing this pin returns the unit
to normal control.
2P plug (black)
Short-circuit during the test run operation.
Open the circuit after the test run.
2P plug (White) : Socket for silent mode
Used for installing the external timer for the silent mode.
(Refer to the section 1-14. Servicing and Maintenance Functions in service manual.)
Plug for Demand Terminal (optional CZ-CAPDC3)
4-7
Mini VRF SYSTEM
PCB Settings
4