Panasonic S-36MK2E5A - Indoor Unit Control PCB Switches and Functions

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PCB and Functions
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Indoor Unit Control PCB Switches and Functions
Indoor unit control PCB
T10: 6P plug (yellow): Used for remote control. (Refer to the remote control section.)
(CN061) Control items: (1) Start/stop input (2) Remote controller prohibit input
(3) Start signal output (4) Alarm signal output
EXCT: 2P plug (red): Can be used for demand control. When input is present, forces the unit to operate with the thermostat
OFF.
DISP: 2P plug (white): Short-circuiting this plug allows the unit to be operated by the remote controller, even if it is not
connected to an outdoor unit.
(In this case, alarm "E04," which indicates trouble in the serial communication between the indoor
and outdoor unit, does not occur.)
CHK: 2P plug (white): 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 unit can be operated even if the remote controller and outdoor unit are not connected.
However even if the remote controller cannot is connected, it cannot be used to operate the unit.
This function can be used for short-term tests.
JP1: Jumper wire: Allows selection of the T10 terminal start/stop signal. (Refer to the remote control section.)
Status at shipment : Pulse signal
Jumper wire cut : Static signal (continuous signal)
FAN DRIVE 2P plug (white): This terminal sends a signal to the ventilation fan when the FAN button on the wired remote
controller is used to operate a commercially-available ventilation fan.
(Refer to the remote control section.)
Use a ventilation fan which can accept no-voltage A contact as the external input signal.
Power LED: LED (red): Illuminates when power is supplied. Blinks when there is a failure in the EEPROM (IC10: nonvolatile
memory).
EEPROM: Nonvolatile memory: Memory which stores the unit type data and other information.
When the PCB is replaced, remove the EEPROM from the old PCB and install it onto the
new PCB.
If an IC failure occurs, replace with a new IC which was provided with the service PCB,
and set the necessary information from the wired remote controller.
(For the procedure, refer to the servicing technical materials.)
GRL:
For AC fan motor (CR-UXRP71B-P (or CR-UXRP71B-PE) : 3P (yellow))
For DC fan motor (CR-SXRP56B-B : 5P (blue))
The indoor unit power terminal plate may be a 7P type, 6P type or may be a 5P type. (Refer to the figure at below.)
The basic wiring diagram shows the 7P-type terminal plate.
Therefore the terminal plate may differ from the illustrations.
(CN073)
(CN072)
(J001)
(IC010)
(CN020)
(CN032)
(D002)
(CN071)
(CN062)
(CN063)
L N U1 U2
5P terminal board
Power
supply
K1 Type
Unit
control
line
L N U1 U2 R1 R2
6P terminal board
Power
supply
Unit
control
line
Remote
control
line
U1 Type
6P terminal board
F2, T2 Type
Power
supply
Remote
control
line
Unit
control
line
L N U1 U2 R1 R2
K2 Type
6P terminal board
Power
supply
cable
Inter-unit
control
wiring
Remote
control
wiring
Y2 Type
Terminal Board
Power supply
cable
Inter-unit con-
trol wiring
Inter-unit con-
trol wiring
2. Indoor Unit Control PCB Switches and Functions
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