1. Outdoor Unit Control PCB
1. Outdoor Unit Control PCB
15. Outdoor Unit Control PCB
Terminal pin (3P, Black)
(CN67)
LED1, 2
RUN pin (2P, White)
(CN27)
1
STOP pin (2P, White)
(CN28)
AP pin (2P, White)
(CN24)
2
MODE pin (3P, Black)
(CN40)
3
4
TEST pin (2P, White)
(CN22)
CHK pin (2P, White)
5
(CN23)
DEF pin (2P, White)
(CN25)
6
SNOW plug (3P, Red)
(CN34)
SILENT plug (2P, White)
(CN33)
7
8
9
For communications circuit impedance matching
•
A connecting socket (2P, White) is attached to the terminal pin 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, when using, see the item "5. Auto Address Setting"
under the section "6. TEST RUN".
•
LED 1 and 2 blink alternately while auto address setting is in progress.
•
Display the alarm contents for alarms which were detected by the outdoor unit.
Start pin
Short-circuit this pin and apply a pulse signal to start all indoor units in that refrigerant system.
Stop pin
Short-circuit this pin and apply a pulse signal to stop all indoor units in that refrigerant system.
Vacuuming pin
•
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 auto address
setting at this time.)
•
Release the short-circuit to return the unit to normal status.
Indoor unit Heating / Cooling mode change pin
•
During the summer season, short-circuit this pin in the cooling mode.
Then, perform auto address setting. When auto address setting is completed,
release the short-circuit to return the unit to normal status.
•
When heating mode is short-circuited, heating operation can be used.
•
When cooling mode is short-circuited, cooling operation can be used.
•
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.
When set to short-circuit, changes to test run mode.
(Test run mode is automatically cancelled after an hour.)
When short-circuit is cancelled, test run mode is cancelled.
When the pin of the main unit is short-circuit in heating mode, defrosting operation is started.
Even if short circuited, defrosting will not be activated immediately.
Can be used when installing a snowfall sensor device.
Can be used when setting the outdoor unit fan is sound absorbing mode.
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PCB and Functions
3WAY VRF SYSTEM
Control Functions