Panasonic U-8ME1E81 Service Manual page 88

1. Outdoor Unit Control PCB
1. Outdoor Unit Control PCB
1. Outdoor Unit Control PCB
Terminal plug
(CN67)
Terminal plug
(CN67)
LED1, 2
Run
LED1, 2
(CN27)
Stop
(CN28)
Power LED
AP
LED4
(CN24)
Run
(CN27)
1
Mode
(CN40)
Stop
1
(CN28)
AP
2
(CN24)
Test
2
(CN22)
Mode
3
(CN40)
CHK
(CN23)
3
SILENT
(CN33)
4
Test
4
(CN22)
DEMAND
(CN71)
FORCED STOP
(CN70)
5
Snowfall sensor (CN34)
5
With the Relay ON, the outdoor fan circulates
regardless of the compressor's running and stop.
• Sample Wiring
6
6
1 1
SNOW
2 2
(CN34)
3 3
7
Outdoor unit
control PC Board
7
8
3P plug (black): For communications circuit impedance matching
• A connecting socket (3P, black) is attached to the terminal plug at the time of shipment from
the factory.
3P plug (black): For communications circuit impedance matching
• 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
• A connecting socket (3P, black) is attached to the terminal plug at the time of shipment from
outdoor units, and move the socket from the "SHORT" side to the "OPEN" side at all other
the factory.
outdoor units. If multiple connecting sockets are left in place, communications trouble will
• In the case of link wiring which combines the inter-unit control wiring for multiple systems
occur.
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
LED (red 2)
outdoor units. If multiple connecting sockets are left in place, communications trouble will
LED 1 and 2 blink alternately while automatic address setting is in progress.
occur.
Display the alarm contents for alarms which were detected by the outdoor unit.
2P plug (black): Drive pin
LED (red × 2)
Short-circuit this pin and apply a pulse signal to start all indoor units in that refrigerant system.
• 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.
2P plug (black): Stop pin
Short-circuit this pin and apply a pulse signal to stop all indoor units in that refrigerant system.
LED (green): Power indicator
2P plug (black): Vacuum pin
Indicates the DC 5V power on the outdoor unit control PCB.
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
2P plug (black): Start pin
automatic address setting at this time.)
Release the short-circuit to return the unit to normal status.
Short-circuit this pin and apply a pulse signal to start all indoor units in that refrigerant system.
3P plug (black): Indoor unit Heating/Cooling mode change pin
2P plug (black): Stop pin
When operating the compressors to perform automatic address setting, operation in
Heating mode can be normally used. However, short-circuiting this pin performs
Short-circuit this pin and apply a pulse signal to stop all indoor units in that refrigerant system.
operation in Cooling mode. (Static signal)
Short-circuiting this pin during ordinary operation changes the mode from Cooling to
2P plug (black): Vacuuming pin
Heating (if the current mode is Cooling) or from Heating to Cooling (if the current mode
• To perform vacuuming of the outdoor unit, short-circuit this pin and then turn the power ON.
is Heating).
All solenoid valves turn ON and vacuuming begins smoothly. (Do not perform automatic
2P plug (black)
address setting at this time.)
This pin is used to test the PCB at the factory.
• Release the short-circuit to return the unit to normal status.
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
2P plug (black): Indoor unit Heating/Cooling mode change pin
when the power is already ON.) Releasing this pin returns the unit to normal control.
• During the summer season, short-circuit this pin in the cooling mode.
2P plug (black) : Test run pin
Then, perform automatic address setting. When automatic address setting is completed,
Short-circuit during the test run operation.
release the short-circuit to return the unit to normal status.
Open the circuit after the test run.
• When heating mode is short-circuited, heating operation can be used.
2P plug (White) : Socket for silent mode
• When cooling mode is short-circuited, cooling operation can be used.
Used for installing the external timer for the silent mode.
(Refer to the section 1 "5-2-3. Silent mode" in service manual.)
2P plug (black)
• This pin is used to test the PCB at the factory.
Plug for Demand Terminal (optional CZ-CAPDC3)
• 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
Plug for Demand Terminal (optional CZ-CAPDC3)
the power is already ON.) Releasing this pin returns the unit to normal control.
3P plug (red)
Power source
External contact
(Snowfall sensor : field supply)
NOTE
1. Ensure that the wiring length between the outdoor unit
control PCB and Relay is less than 2m.
Lead wire with 3P socket :
(service parts available: part code / CV6233225203)
2. Select the Relay that is the minimum load 0.1mA for the
contact specifications.
3. Install the air-discharge chamber in the area of outdoor
air temperature lower than approx. 0°C and also
when operating in the cooling mode all through the year.
* When operating in the snow sensor mode, the unit will
not operate by the effect of the freeze-prevention.
4-4
4-4
2WAY SYSTEM
3WAY SYSTEM
PCB Settings
PCB Settings
2WAY SYSTEM
PCB Settings