Functions (For A748186, A748187) - Panasonic U-72MF2U9 Technical Data Manual

1. Outdoor Unit Control PCB
1. Outdoor Unit Control PCB

1-7. Functions (for A748186, A748187)

A. ADD pin (2P, White)
(CN30)
SW1
Rotary switch
1
(10 positions, Black)
2
SW2
DIP switch (2P, Black)
3
4
SW3
Rotary switch
(10 positions, Red)
SW4
DIP switch (3P, Black)
5
SW5
DIP switch (3P, Black)
SW6
6
DIP switch (3P, Black)
SW7
DIP switch (4P, Black or
7
3P, Black)
8
9
Auto 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. Auto 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 auto address setting is in progress, the 2 LEDs (LED1, 2: Red) on the outdoor unit
control PCB blink alternately. (Short-circuiting this pin while auto address setting is in
progress will stop the auto address setting operation.)
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, see Table 7-1.)
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
SW1.
• 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 SW1 and SW2, see Table 7-1.)
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, see Table 7-2.)
Switches for setting the 10s, 20s, and 30s digit for the number of connected indoor units
(For details concerning SW3 and SW4, see Table 7-2.)
Unit No. setting switch
• The setting is "1" at the time of shipment. (For details, see Table 7-3.)
Switch for setting the number of outdoor units
• Turn the switches ON according to the number of outdoor units (1 - 3). (For details, see
Table 7-4.)
Backup operation switch
If 1st compressor has malfunctioned, turn INV ON and BACKUP SW ON to operate the outdoor
unit using only 2nd compressor.
If 2nd compressor has malfunctioned, turn INV2 / AC ON and BACKUP SW ON to operate the
outdoor unit using only 1st compressor.
7 - 6
PCB and Functions
PCB and Functions