Functions Of Outdoor Unit Pcb - Panasonic S-36PU1E5A Service Manual

4-14. Functions of Outdoor Unit PCB

CN-A.ADD
S002
S003
JP001
TERMINAL
2P plug : Automatic 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 "1" at the time of shipment. Automatic 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 automatic address setting is in progress, the 2 LEDs (LED1, 2: red) on
the outdoor unit control PCB blink alternately. (Short-circuiting this pin while
automatic address setting is in progress will stop the automatic address setting
operation.)
Rotary switch (10 positions, yellow): Outdoor system address setting switch
• The setting is "1" 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, refer to Table 1.)
DIP switch (2P): 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 S002.
• 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 concerning S002 and S003, refer to Table 1.)
Jumper wire
3P plug : 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, leave the connecting
socket in place at only one of the outdoor units, and move the socket from the
"SHORT" side to the "OPEN" side at all other outdoor units. If multiple
connecting sockets are left in place, communications trouble will occur.
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