Panasonic U-4LE2E5 Service Manual & Test Run Service Manual page 50

12. Outdoor Unit Control PCB
CN-TERMINAL pin
(3P, Black)
LED1, 2 (2P, Red)
1
RUN pin (2P, Black)
STOP pin (2P, Black)
AP pin (2P, Black)
MODE pin (3P, Black)
TEST pin (2P, Black)
CHK pin (2P, Black)
DEF pin (2P, Black)
SILENT plug (2P, White)
OC EMG terminal (3P, Black) If "TO INDOOR UNIT" accidently connected to high voltage, use the following method.
For communications circuit impedance matching
• A connecting socket (3P, Black) is attached to the terminal plug at the time of shipment from
the factory.
• In the case of link wiring which combines the inter-unit control wiring for multiple systems into
a single communications circuit, When using, refer to the item "4. Auto Address Setting" under
the section "7. TEST RUN".
• LED 1 and 2 blink alternately while auto address setting is in progress.
• Display the alarm contents for alarms which were detected by the outdoor unit.
When short circuited and pulse signal is given, all indoor units operate in the same refrigerant
system.
When short circuited and pulse signal is given, all indoor units stop in the same refrigerant
system.
(When short circuited, operation cannot be performed by the indoor unit's remote controller.)
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 auto address
setting at this time.)
• Release the short-circuit to return the unit to normal status.
Changes to cooling/heating mode.
• When in normal operation:
When short circuited the COOL side, indoor unit operation in the same refrigerant system
changes to all cooling mode.
When short circuited the HEAT side, indoor unit operation in the same refrigerant system
changes to all heating mode.
• When in auto address setting:
Changes to heating mode with open-circuit.
• 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.
When short circuited, test run begins.
(If the remote controller is connected in test run mode, it is automatically cancelled after 1 hour.)
Also, if short-circuit is cancelled, test run mode is cancelled.
When the pin of the main unit is short-circuit in heating mode, defrosting operation is started.
Even if short circuited, defrosting will not be activated immediately.
Can be used when setting the outdoor unit fan in sound absorbing mode.
1. Replace the wire CN-OC with the wire CN-EMG.
2. Cut off SA1.
Control Functions - Outdoor unit
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Mini VRF SYSTEM