Sanyo Big PACi 18 Series Technical Data & Service Manual page 212

4-2. Outdoor Unit Control PCB (CR-C906VH8)
(2) Explanation of Functions
Auto Address Pin 2P (white): Automatic address setting switch
(CN047)
If the system address switch (S002: set to 0 at time of shipment) setting is other than
(central control), press this switch once to automatically set the addresses at all indoor
units which are in the same system, and are connected to that outdoor unit.
During automatic address setting, the 2 LEDs (red) on the outdoor unit control PCB blink
alternately.
(Pressing this switch again stops automatic address setting.)
If automatic address setting is currently in progress at another system that is subject to
central control, only LED 1 on the outdoor unit control PCB blinks to indicate that automatic
address setting is in progress at another unit. If automatic address setting is in progress
at another unit, automatic address setting cannot be made at this unit, even if S001 is
pressed.
* After the power is turned ON, automatic address setting will not be functioned for over 1
minute and 30 seconds.
S002 Rotary switch (10 positions, black): System address setting switch
This switch is set to 0 (1 system control) at the time of shipment. However the address for
each system must be set when multiple systems are controlled or when central control is
used. (Figure 1)
If the system address is set to 0, automatic address setting is started when the power
is turned ON. Therefore it is not necessary to use switch SW01 and perform automatic
address setting in the case of single or simultaneous-operation multi control of a single
system.
When using central control for multiple systems, a maximum of 30 systems (maximum
64 units) can be connected. In the case of group control or central control, set the system
address to a setting other than 0 (1 or above).
If the number of systems is greater than 9, this switch can be used in combination with DIP
switch S003 to set up to 30 systems. The setting can be made as high as 39, however all
settings above 30 are handled as 30 for control. (For details, refer to Table 4-1.)
If system addresses are duplicated (the same address exists more than once), LED 1
on the outdoor unit control PCB lights up, and alarm "L04" is displayed on the remote
controller.
S003 DIP switch (2P, blue): System address 10s-digit and 20s-digit place setting switch
When setting 10 systems or more, set this switch in combination with S002.
For 10 – 19 systems, set 1P (10s-digit place) to ON.
For 20 – 29 systems, set 2P (20s-digit place) to ON, and set 1P (10s-digit place) to OFF.
For 30 systems, set both 1P (10s-digit place) and 2P (20s-digit place) to ON.
(For details, refer to Table 4-1.)
PUMP DOWN Pin PUMP DOWN Pin (2P, white)
(CN048)
Press this switch to perform refrigerant recovery control using cooling operation.The indoor
unit fan will operate at HIGH and 55 Hz for a maximum of 10 minutes. When refrigerant
recovery is completed, close the valves and press this switch to stop the operation.
Test (CN033) 2P plug (red): Pin used for PCB inspection at the factory
EXCT (CN030) 3P plug (red): Can be used for demand control
The operating ranges are shown in the table.
Outdoor unit control PCB
Note 1: The maximum length of the wiring between the outdoor unit PCB and the relay is 2 m.
Lead wire with 3P plug (special-order part : 623-161-2098)
Relay (field supply) contact input specifications : minimum compatible load 0.1mA
Relay (field supply)
1 1
EXCT
2 2
plug
Demand
(CN030)
input 2
3 3
4-9
Short-circuited
2P and 3P 1P and 3P
0 0
0 1
Demand
1 0
input 1
1 1
"0"
4
Operating range
No limit
100% at shipment
70% at shipment
OFF