Panasonic U-72MF2U9 Technical Data Manual page 119

1. Outdoor Unit Control PCB
1. Outdoor Unit Control PCB
Terminal pin (3P, Black)
(CN67)
LED1, 2
RUN pin (2P, White)
(CN27)
STOP pin (2P, White)
(CN28)
AP pin (2P, White)
(CN24)
MODE pin (3P, Black)
(CN40)
TEST pin (2P, White)
(CN22)
CHK pin (2P, White)
(CN23)
DEF pin (2P, White)
(CN25)
SNOW plug (3P, Red)
(CN34)
SILENT plug (2P, White)
(CN33)
For communications circuit impedance matching
• A connecting socket (2P, White) is attached to the terminal pin 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 "5. Auto Address Setting"
under the section "6. TEST RUN" in the Service Manual.
• 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.
Start pin
Short-circuit this pin and apply a pulse signal to start all indoor units in that refrigerant system.
Stop pin
Short-circuit this pin and apply a pulse signal to stop all indoor units in that refrigerant system.
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.
Indoor unit Heating / Cooling mode change pin
• During the summer season, short-circuit this pin in the cooling mode.
Then, perform auto address setting. When auto address setting is completed,
release the short-circuit to return the unit to normal status.
• When heating mode is short-circuited, heating operation can be used.
• When cooling mode is short-circuited, cooling operation can be used.
• 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 set to short-circuit, changes to test run mode.
(Test run mode is automatically cancelled after an hour.)
When 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 installing a snowfall sensor device.
Can be used when setting the outdoor unit fan is sound absorbing mode.
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PCB and Functions
PCB and Functions
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