Master / Slave Settings
All split system indoor units are supplied set up as a master unit as default and this only needs changing when the system being
installed is a multisplit system, excluding SCM or KX systems, comprising of 2 to 4 RAC or PAC indoor units running off a
PAC single split outdoor unit. The remote control wires and all wires of the interconnecting cable go to each indoor unit
including the slave units.
When using RAC SRK indoor units, excluding ZMP/ZSP models, on a multisplit each indoor unit needs an SC-BIKN-E
interface to allow the installation of the wired remote control and setup of the master slave settings.
SYSTEM TYPE PAC Indoor Units SC-BIKN-E Interface
Unit SW5-1 SW5-2 SW3-1 SW3-2
Single Twin Triple Quad MASTER OFF OFF OFF OFF
Twin Triple Quad SLAVE 1 OFF ON OFF ON
Triple Quad SLAVE 2 ON OFF ON OFF
Quad SLAVE 3 ON ON ON ON
All indoor units on a multisplit system must be in the same space and operate off a single wired remote control as there is no
refrigerant control in the indoor units.
Group Settings
When multiple systems need to be controlled off a single RC-EX1A, RC-EX3 or RC-E5 wired remote control each system
needs to be given a different address. The system addressing is set on PAC unit indoor boards using SW2 or on RAC indoor
units via SW1 on the SC-BIKN-E interface. Upto 16 indoor units can be connected to a wired remote and that includes
multiplit systems using PAC outdoor units.
System Indoor Outdoor System Unit Group Address Master Slave
Unit Unit Type Switch Setting Switch #1 #2
1 FDT FDC Split Master SW2 0 SW5 OFF OFF
2 FDT FDC Quad Master SW2 1 SW5 OFF OFF
FDT Slave 1 SW2 1 SW5 OFF ON
FDT Slave 2 SW2 1 SW5 ON OFF
FDT Slave 3 SW2 1 SW5 ON ON
3 SRK FDC Twin Master SW1 2 SW3 OFF OFF
SRK Slave 1 SW1 2 SW3 OFF ON
4 FDUM FDC Split Master SW2 3 SW5 OFF OFF
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