4-20
4
4-4. Indoor Unit Control PCB Switches and Functions
[Indoor unit control PCB]
T10 (CN061): 6P plug (YEL) / Used for remote control operation. (Refer to the Remote Control Section.)
Control items: (1) Start/stop input
(3) Start signal output
(2) Remote controller prohibit input
(4) Alarm signal output
EXCT (CN073): 2P plug (RED) / Can be used for demand control. When input is present, forces the unit to
operate with the thermostat OFF.
DISP (CN063): 2P plug (WHT) Type E1:
2P plug (BLK) Type E3:
Short-circuiting this plug allows operation to be controlled by the remote controller even when
an outdoor unit is not connected. (In this case, alarm “E04,” which indicates trouble in the
serial communication between the indoor and outdoor unit, does not occur.)
CHK (CN062): 2P plug (WHT) Type E1:
2P plug (BLK) Type E3:
Test pin. Short-circuiting this pin allows the indoor FM (H fan speed), drain pump, flap motor
(F1 position), and electronic expansion valve full-open position to be checked.
However this function turns OFF if the indoor unit protection mechanism is activated.
The components will operate even if the remote controller and outdoor unit are not
connected, however the remote control cannot be used for control even if it is connected.
This plug can be used for short-term tests.
JP1 (JP001): Jumper wire / Allows selection of the T10 terminal start/stop signal. (Refer to the Remote
Control Section.)
Setting at time of shipment: Pulse signal
Jumper wire cut: Static signal (continuous signal)
Fan drive (CN032): 2P plug (WHT) / This terminal sends the signal to the ventilation fan when a commercially
available ventilation fan is operated by the FAN button on the wired remote controller. (Refer
to the Remote Control Section.)
Use a ventilation fan which can accept the no-voltage contact A signal as the external input
signal.
Power LED: LED (RED) / Illuminates when the power is ON. Flashes when there is trouble with the
EEPROM (IC10, IC010: nonvolatile memory).
EEPROM (IC010): Nonvolatile memory / Used to store model information and other data. When replacing
the PCB, remove the EEPROM from the old PCB and install it onto the new PCB. If there is
IC trouble, replace with a new IC (provided with the servicing PCB), and set the necessary
information using the wired remote controller. (For the setting procedure, refer to the
servicing technical materials.)
Type E3
R1
R2
U1
U2
LN
Power
supply
Type E1
Remote
control
wiring
Inter-unit
control
wiring
2P terminal board × 3
Power supply Remote
control
wiring
Inter-unit
control
wiring
L N U1 U2 R1 R2
SM830277-00_大洋州向け R32シングル_TD&SM.indb 20 19/02/21 11:54:24
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