Samsung RD080HRXGB Installation Manual page 38

installing the unit
WIRING WORK
Power wiring diagram
 External connection diagram of DVM PLUS IV HR
3 phase 4 wires
Indoor Outdoor
OF1 OF2
MCU
Communication
cable between
indoor and outdoor units
Indoor Outdoor
OF1 OF2
MCU
Communication
cable between
indoor and outdoor units
• I ndoor power supply must be separated from outdoor power supply.
• C onnect the communication cable among the outdoor units when combining the
CAUTION
outdoor units.
• C onnect the communication cable between indoor and outdoor units to the main
outdoor unit.
• I f the communication cable between indoor and outdoor units and the
communication cable among outdoor units are crossed, communication is not
available.
• The length of the cable among the outdoor units should be under 30m or less.
• Do not multiplex the communication cable to prevent communication error.
• M aximum wiring length between the outdoor unit and the farthest indoor unit is
1000 meters.
38_ installing the unit
Indoor Outdoor
R S T N OF1 OF2
Indoor Outdoor
R S T N OF1 OF2
Communication cable
R S T N
Earth
R S T N
Earth
Communication cable