Panasonic R410A service manual Outdoor Unit Control PCB CR-CH4272R

2. Processes and functions

2-6 Outdoor Unit Control PCB (CR-CH4272R)

(1) Explanation of Functions

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S001	Push-button switch (black): Automatic address setting switch
	•	If the system address switch (S002: set to 0 at time of shipment) setting is other than
		"0" (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 started at this unit,
		even if S001 is pressed.
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 sys-
		tem 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 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 con-
		troller.
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 1.)
S005	Refrigerant recovery switch (red button switch)
	•	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 (CN036)	2P plug (red): Pin used for PCB inspection at the factory
EXCT (CN026)	3P plug (red): Can be used for demand control
	•	The operating ranges are shown in the table.
			Short-circuited			Operating
			2P and 3P	1P and 3P		range
			0		0	normal (at shipment
						from factory)
			0		1	rated capacity
			1		0	70%
		1		1	0%

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