Indoor Unit Control Pcb Switches And Functions - Sanyo Big PACi 18 Series Technical Data & Service Manual

4-3. Indoor Unit Control PCB Switches and Functions

[Indoor unit control PCB]
T10 (CN61): 6P plug (YEL) / Used for remote control operation. (Refer to the Remote Control Section.)
Control items: (1) Start/stop input
EXCT (CN73): 2P plug (RED) / Can be used for demand control. When input is present, forces the unit to
operate with the thermostat OFF.
DISP (CN72): 2P plug (WHT) / 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: 2P plug (WHT) / Test pin. Short-circuiting this pin allows the indoor FM (H fan speed), drain
pump, fl ap 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 (J01): 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: 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.
Filter: 2P (WHT) / This terminal is used to connect contact input from the differential-pressure
switch, used to detect fi lter clogging. When the contact is ON, "FILTER" appears on the
display of the wired remote controller.
Power LED: LED (RED) / Illuminates when the power is ON. Flashes when there is trouble with the
EEPROM (IC10, IC010: nonvolatile memory).
EEPROM (IC10): 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.)
GRL (CN20): For AC fan motor (CR-UXRP71B-B) – 3P (YEL)
For DC fan motor (CR-SXRP56B-B) – 5P (BLU)
There are 5P, 6P, 7P and 8P control PCB types for indoor units.
5P terminal board
1 2 3 4 5
1(L)2(N) 4 5
Power Inter-unit
POWER
supply
control wiring
SUPPLY
K Type
(3) Start signal output
6P terminal board
L N U1 U2 R1 R2
REMOTE
CONTROL
UNIT
LINE
CONTROL
LINE
XM, US Type
(2) Remote controller prohibit input
(4) Alarm signal output
7P terminal board
1(L) 2(N) U1 U2 R1
Inter-unit
Power supply Remote
control wiring
controller
X, T, D Type
4-11
8P terminal board
1 2 U1 U2 R1
1(L)2(N) R1 R2
Power Remote
controller
supply
R2
U1 U2
Inter-unit
control wiring
U Type
4
R2