Panasonic U-4LE1E5 Service Manual page 9

2. Settings of Indoor Unit Control PCB
Examples of the No. of indoor units settings
No. of indoor units
1 unit (factory setting)
2 units
9 units
Examples of refrigerant circuit (R.C.) address settings (required when link wiring is used)
System address
No.
System 1 (factory setting)
1
System 11
System 21
System 30
<General Explanation of the Switches on the Outdoor Unit Control PCB>
MODE (3P, white) Changes the operating mode (heating/cooling). (Can be used only at the main unit.)
(CN-MODE) During normal operation: Short-circuiting these pins once will change all indoor units in that
system to either cooling mode or heating mode.
During automatic address setting: When the pins are not connected, the mode is heating mode.
Short-circuited for 1 second or longer → Automatic address setting begins when the pins are
A. ADD (2P, white)
(CN-A.ADD) released. Short-circuiting these pins for 1 second or longer while automatic address setting is in
progress interrupts automatic address setting.
CHK (2P, white) When these pins are short-circuited, the mode is test run mode. (Test run mode is automatically
(CN-CHK) canceled after 1 hour.) When the pins are released, test run mode is canceled.
RC (3P, blue) The outdoor unit maintenance remote controller can be connected here to check the alarm
(CN-RC) details.
RUN (2P, white) Short-circuit these pins and apply a pulse signal to start all indoor units in that system.
(CN-RUN)
STOP (2P, white) Short-circuit these pins and apply a pulse signal to stop all indoor units in that system.
(CN-STOP) (If the pins are left short-circuited, it will not be possible to start operation from the indoor unit
remote controllers.)
AP (2P, white) These pins are used when applying vacuum to the outdoor unit.
(CN-AP)
Indoor unit setting (S004)
(Rotary switch, gray)
set to 1
set to 2
set to 9
System address System address
(S003)
(2P DIP switch, black) (Rotary switch, yellow)
Both OFF
ON
ON
1 2
OFF
1 ON
ON
ON
1 2 OFF
2 ON
ON
ON
1 2
OFF
1 & 2 ON
ON
ON
1 2
OFF
(S002)
set to 1
set to 1
set to 1
set to 0
1-4
Mini VRF SYSTEM
Address Settings