Panasonic U-72MF2U9 Service Manual

Also see for U-120MF2U9: Installation instructions Operating instructions Installation instructions Technical data

Contents

3WAY VRF SYSTEMControl Functions1 - 5312345678915. Outdoor Unit Control PCBPCB and Functions1. Outdoor Unit Control PCB15-7. Functions (for A748186, A748187)A. ADD pin (2P, White)(CN30)Auto address setting pinShort-circuit this pin for 1 second or longer to automatically set the addresses at the indoorunits 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 evenfor communications lines in a single system where the inter-unit control wiring does notcross to any other systems.While auto address setting is in progress, the 2 LEDs (LED1, 2: Red) on the outdoor unitcontrol PCB blink alternately. (Short-circuiting this pin while auto address setting is inprogress will stop the auto address setting operation.)•••Outdoor system address setting switchSW1Rotary switch(10 positions, Black) The setting is "1" at the time of shipment. It is not necessary to change the setting if wiringis connected only to an outdoor unit and indoor units in a single system and the inter-unitcontrol wiring does not cross multiple systems.If wiring links the inter-unit control wiring for multiple systems to the same communicationslines, 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 beconnected. This setting can be set up to "39," however control will be for 30 systems evenif the setting is set to higher than 30. An alarm will be displayed if system addresses areduplicated. (For details, see Table 1.)•••Switches for setting system address 10s digit and 20s digitSW2DIP switch (2P, Black) If 10 systems or more are set, the setting is made by a combination of this DIP switch andSW1.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 1.)••••Switch for setting the number of connected indoor units. In order to allow the outdoor unit toSW3Rotary switch(10 positions, Red)manage indoor units in the same refrigerant system, set the number of connected indoor units.(For details, see Table 2.)Switches for setting the 10s, 20s, and 30s digit for the number of connected indoor unitsSW4DIP switch (3P, Black) (For details concerning SW3 and SW4, see Table 2.)Switch for setting the number of outdoor unitsSW5DIP switch (3P, Black)Turn the switches ON according to the number of outdoor units (1 - 3). (For details, seeTable 4.)•Unit No. setting switchSW6DIP switch (3P, Black)The setting is "1" at the time of shipment. (For details, see Table 3.)•Backup operation switchSW7DIP switch (4P, Black or3P, Black)If 1st compressor has malfunctioned, turn INV ON and BACKUP SW ON to operate the outdoorunit using only 2nd compressor.If 2nd compressor has malfunctioned, turn INV2 / AC ON and BACKUP SW ON to operate theoutdoor unit using only 1st compressor.