4
- 4
2-WAY MULTISET VRF SYSTEM
PCB Settings
4
4 -
4
LED1, 2
D72, D75
Power LED
D53
Run
(CN103)
Stop
(CN104)
AP
(CN102)
Mode
(CN101)
Test
(CN022)
• LED 1 and 2 blink alternately while automatic address setting is in progress.
• Display the alarm contents for alarms which were detected by the outdoor unit.
• To perform vacuuming of the outdoor unit, short-circuit this pin and then turn the power
ON. All solenoid valves turn ON and vacuuming begins smoothly. (Do not perform
automatic address setting at this time.)
• Release the short-circuit to return the unit to normal status.
LED (red
×
2)
LED (red): Power indicator
2P plug (white): Start pin
2P plug (white): Stop pin
2P plug (white): Vacuuming pin
• When operating the compressors to perform automatic address setting, operation in
Heating mode can be normally used. However, short-circuiting this pin performs
operation in Cooling mode. (Static signal)
• Short-circuiting this pin during ordinary operation changes the mode from Cooling to
Heating (if the current mode is Cooling) or from Heating to Cooling (if the current mode
is Heating).
2P plug (white): Indoor unit Heating/Cooling mode change pin
• This pin is used to test the PCB at the factory.
• When the power is turned ON after this pin has been short-circuited, all output signals
will be output in sequence. (Sequential output does not occur if this pin is short-circuited
when the power is already ON.) Releasing this pin returns the unit to normal control.
2P plug (white)
Indicates the DC 5V power on the outdoor unit control PCB.
Short-circuit this pin and apply a pulse signal to start all indoor units in that refrigerant
system.
Short-circuit this pin and apply a pulse signal to stop all indoor units in that refrigerant system.
• A connecting socket (3P, black) is attached to the terminal plug at the time of shipment
from the factory.
• In the case of link wiring which combines the inter-unit control wiring for multiple
systems into a single communications circuit, leave the connecting socket in place at
only one of the outdoor units, and move the socket from the “SHORT” side to the
“OPEN” side at all other outdoor units. If multiple connecting sockets are left in place,
communications trouble will occur.
Terminal plug
3P plug (black): For communications circuit impedance matching
1. Outdoor Unit Control PCB
