Outdoor Unit Control Pcb (Acxa73-3030*, Acxa73-3028*) - Panasonic Elite Big PAC-i S-200PE3E5B Technical Data & Service Manual

Outdoor Unit Control PCB (ACXA73-3030*, ACXA73-3028*)

Explanation of Functions
A. ADD pin (2P, Black)
SW2 (10 positions, Yellow) Outdoor system address setting switch
Rotary switch
SW1 (2P, Black)
DIP switch
PUMP DOWN (2P, Black)
LED 1 (D302)
LED 2 (D303)
RUN (2P, Black)
Stop (2P, Black)
Mode change (3P, Black)
Test (2P, Black)
CHK (2P, Black)
Auto address setting pin
• Short-circuit this pin for 1 second or longer to automatically set the
addresses at the indoor units that are connected to that outdoor unit and
are within the same system.
• The system address is "0" at the time of shipment. Auto address setting
is necessary even for communications lines in a single system where the
inter-unit control wiring does not cross to any other systems.
• While auto address setting is in progress, the 2 LEDs (LED1, 2: Red) on
the outdoor unit control PCB blink alternately. (Short-circuiting this pin
while auto address setting is in progress will stop the auto address setting
operation.)
• The setting is "0" at the time of shipment. It is not necessary to change
the setting if wiring is connected only to an outdoor unit and indoor units
in a single system and the inter-unit control wiring does not cross multiple
systems.
• If wiring links the inter-unit control wiring for multiple systems to the same
communications lines, then a different address must be set for each
refrigerant tubing system.
• If wiring links multiple systems, a maximum of 30 systems (up to 64 indoor
units) can be connected. This setting can be set up to "39," however control
will be for 30 systems even if the setting is set to higher than 30.
An alarm will be displayed if system addresses are duplicated.
(For details, see Table 4-1.)
Switches for setting system address 10s digit and 20s digit
• If 10 systems or more are set, the setting is made by a combination of this
DIP switch and SW2.
• If 10 - 19 systems are set, set switch 1 (10s digit) to ON.
• If 20 - 29 systems are set, set switch 2 (20s digit) to ON, and set switch 1
(10s digit) to OFF.
• If 30 systems are set, set both switch 1 (10s digit) and switch 2 (20s digit)
to ON.(For details, see Table 4-1.)
Refrigerant recovery Pin
• Short circuit this pin to perform refrigerant recovery control using cooling
operation. The indoor unit fan will operate at HIGH and 60Hz for a maximum
of 10 minutes When refrigerant recovery is completed, close the valves
and open circuit this pin to stop the operation.
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.
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.
Indoor unit Heating/Cooling mode change pin
• 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).
• 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.
• Short-circuit during the test run operation.
• Open the circuit after the test run.
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