Mini VRF SYSTEM
PCB Settings
4
1. Outdoor Unit Control PCB
4-6
1-3. Functions of Outdoor Unit PCB
CN-A. ADD
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.)
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S002
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 4-1.)
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S003
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 4-1.)
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S004
Rotary switch (16 positions, Red): Switch for setting the number of connected indoor
units. In order to allow the outdoor unit to manage indoor units in the same refrigerant
system, set the number of connected indoor units. (For details, refer to Table 4-2.)
JP001
Jumper wire
TERMINAL
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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SM830209-00̲Mini̲VRF SYS.indb 6
SM830209-00̲Mini̲VRF SYS.indb 6
2012/01/11 18:26:37
2012/01/11 18:26:37
