Panasonic Cs W50bd3p Cu V50bbp8 Cu W50bbp8 Repair Manual

							18.4. Wiring
Whenboth indoor and outdoor unit draw power
(Example: 3 Phase power supply model)
When only theoutdoor unit draws power
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							19 WIRING MISTAKE PREVENTION
Improved quality of installation work through adoption of an “Connection error prevention” circuitwhichpreven ts wiring
mistakes
Conne ction errors with the control wires and the power supply wires will not only contribute to burning-out of the control circuit
board, but can also cause large-scale working losses and affect reliability. If a circuit board with a “Connection error prevention”
circuit is used, the relay will not operate if the wires have been connected incorrectly, so that current will not flow to the control
circuit board. This is designed principally toeliminate human error at the installa tion site.
Prevention of connection errors
These units are equipped with connection error prevention circuits. If the units do not operate, it is possible that the connection error
prevention circuits have operated. In such cases, check that the power supply wires (connected to terminals 1
and 2and the
control wires (connected to terminals 3
and 4) are connected correctly. If they are connected incorrectly, connnectthem
correctly. Normal operation should thencommence.
 
    • 
• •  • 
Do not short the remote control wires to each other. (The protection circuit will be activated and the units will not operate.) Once
the cause of the short is eliminated, normal operation will then be possible.
NOTE:
 
    • 
• •  • 
W ait one minute after turning on the indoor unit power supply before operating theremote control.
 
    • 
• •  • 
If nothing at all appears in the remote control LCD, check the powersupply for the indoor unit.
Refer to “TROUBLE SHOOTING”.
NOTE:
Never do any of the following, as doing so may damage the printed circuit board.
 
    • 
• •  • 
Do not connect anythin g except a relay to the timer input or fan speed output (connector CNT1 on printed circuit board).
 
    • 
• •  • 
Do not connect U-NET transmission wires to terminals 3 and 4 of the indoor and outdoor units. (*1)
 
    • 
• •  • 
Do not connect U-NET transmission wires to terminals A and B of the remote control.
(*1) U-NET transmission wires are the communication wires used for the central controller.
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							20.1. Test operation
 
    • 
• •  • 
Always be sure to use a properly-insu lated tool to operate
the switch on the circuit board. (Do not use your finger or a
metallic object).
 
    • 
• •  • 
Never turn on the power supply until all installa tion work has
been completed.
 
    • 
• •  • 
Turn on the circuit breaker before test operation extends
past 6 hours.
(The crankcase heater will become energized, which will
warm the compressor and prevent liquid compression.)
 
    • 
• •  • 
For three-phase models, check that the phase is not
reversed.
(Outdoor unit printed circuit board)
During outdoor unit emergency operation or test operation, the
LEDs on the printed circuit board will flash.
To cancel test operation, press the TEST or RUN button once
more while test operation is being carried out.
(Test operation will stop automatically after 30 minutes have
passed.)
NOTE:
 1. These units are equipped with connection error prevention
circuits. If the units do not operate, it is possible that the
connection error prevention circuits have operated. In such
cases, check that the drive wires (connected to terminals [1]
and [2]) and the control wires (connected to terminals [3]
and [4]) are connected correctly. If they are connected
incorrectly, connect them correctly. Normal operation
should then commence.(If the phase is reversed, the LED on the printed circuit
board will flash.)
 
    • 
• •  • 
Check that the voltage is 198 V or higher when starting the
unit. (The unit will not operate if the voltage is less than
198V.)
 
    • 
• •  • 
Carry out test operation for 5 minutes or more using the
remote control or the switch on the outdoor unit printed
circuit board.
 
    • 
• •  • 
Always carry out cooling first during test operation, even
during the warm season.
(If heating is carried out first, problems with operation of the
compressor will result.)
 2. Do not short the remote control unit wires to each other.
(The protection circuit will be activated and the units will not
operate.)
Once the cause of the short is eliminated, normal operation
will then be possible.
20 TEST OPERATION AND SELF DIAGNOSIS
20.2. Test operation from the outdoor unit
43 
						

							20.3. Test operation using the wired remote control
44 
						

							45 
						

							O
OO O
Self-diagnosis error code table
46 
						

							21 SETTING OF SAVE ENERGY AND THERMISTOR SWITCH
21.1. Energy save setting
Open the cover remote control unit and confirm the presence of the [ RP1] marking.
Energy save setting method should be different for with [ RP1] marking and without [RP1] marking.
47 
						

							22 GROUP CONTROL
1 Setting group for 1 remote control unit
 
    • 
• •  • 
W hen using a remote control thermostat, the thermostat setting is used for all indoor units in the group.
 
    • 
• •  • 
During group control, up to a maximum of 16 indoor units can be connected. (Do not mix heat pump units and cooling only
units.)
 
    • 
• •  • 
Do not mix manua l settings and automatic settings. (Manual settings take priority.)
 
    • 
• •  • 
The master unit and slave units can all be centrally controlled during group control.
Automatic setting for group control
 
    • 
• •  • 
If the power supplie s for indoor units which are connected are turned on simultaneousl y, the indoor unit numbe rs will be
determined automatically after approximately 1 minute. (DIP switch settings are not necessary.)
NOTE:
 
    • 
• •  • 
Correct wiring connections are basic requirements for automatic setting. If the wires are connected incorrectly when the power
is turned on, the settings will not be made correctly and operation will not be possible.
 
    • 
• •  • 
W hen address numbe rs are set automatically , you will not know which address numbe r corresponds to which indoor unit.
 
    • 
• •  • 
Do not turn off the power supply for at least 1 minute duringautomatic address setting, otherwise the settings will not be made
correctly.
Automatic address resetting for group control
After setting DIP switches 1 to 4 to OFF and stop operation. Then press the “AIR SWING AUTO”, “OPERATION MODE” and “Air
conditioner No.” switches simultaneousl y. Then addresses will be momentarily reset, and then automatic address setting will be
carried out once more.
Switching the thermistor
 
    • 
• •  • 
The temperature detection thermistor used for detecting the air temperature and changing between COOL and HEAT
operation can be switched between the thermistor at the indoor unit and the thermistor at the remote control unit box.
However, do not switch to the remote control unit thermistor if using two remote control units.
 1. While operation is stopped, press and hold the STOP/RUN switch, and then press the UP andDOWN
switches together.
 2. DO or 01 will appear in the time display .
 3. Press theFORWARD orBACK timer switches to switch thedisplay between 00 and 01 . 00 ... Indoor unit setting
(factory default ) 01 ... Remote control unit setting
 4. Press the RESERVE switch. (Be sure to press the RESERVE switch so that normal operation mode can be resumed.)
 
    • 
• •  • 
Repeat the procedure in steps (1) to (4) to change the setting again.
48 
						

							If test operation does not proceed correctly
Carry out test operation after approximately 6 hours have passed
since the power was turned on (crankcase heater is energized). If
operation is started by using the remote control within 1 minute of
turning on the power, the outdoor unit settings will not be made
correctly and correct operation will not be possible.
If the following symptoms occur after turning on the power,
check the wiring connections once more.
 
    • 
• •  • 
For standard installation
(System example)
 1. The main power is turned on while the indoor-outdoo r
transmission wires are not connected (open circuit at
section A)
Symptom:
Remote control unit . . . “CHECK” flashes
NOTE:
Indoor unit. . . LED2 on printed circuit board flashes
Outdoor unit. . . LED3 and LED7 on printed circuit
board flash
 2. The main power is turned on while the indoor-outdoo r
power supply wires are not connected (open circuit at
section B)
Symptom:
Remote control unit . . . Display of “No power supply”
NOTE:
Indoor unit...Nodisplay
Outdoor unit. . . LED3 and LED7 on printed circuit
board flash
 3. The main power is turned on while the remote control
unit connection cord is not connected (open circuit at
section C)Symptom:
Remote control unit . . . Display of “No power supply”
NOTE:
Indoor unit . . . LED1 on printed circuit board stays
illuminated
Outdoor unit . . . LED1 on printed circuit board stays
illuminated
(When remote controldisplay shows “Power supply ”)
(When remote controldisplay shows “No power supply ”)
Remedy
 1. Turn off the main power.
↓
 2. Conne ct the disconnected wire correctly.
↓
 3. Turn the main power back on.
↓
 4. After 1 minute, start operation using the remote control.
(Indoor unit . . . Operation will start according to the
remote control setting.)
(Outdoor unit...Operation will start after 3-5 minutes.)
NOTE:
The “CHECK” display on theremote control and the
flashing of LEDs on the printed circuit boards will not occur
immediately. They will appear 3-6 minutes after the main
power is turned on.
23 TROUBLE SHOOTING
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							 1. The main power is turned on while the transmission
wires between the indoor unit(s) are not connected
(open circuit at section A)
Symptom:
Nothing abnormal appears on the remote control
display . If operation is then started in this condition, the
combination of the 43BB outdoo r unit and the 40U
indoor unit (master unit) will cause abnormal operation
to occur.
↓
If operation continues, an abnormality will occur on the
refrigeration cycle and operation will stop.
 
    − 
− −  − 
Remote control. . . “CHECK” flashes
 
    − 
− −  − 
Indoor unit (master). . . The LEDs on the printed
circuit board flash and operation stops
 
    − 
− −  − 
Indoor unit (slave) . . . LED1 on the printed circuit
board illuminates and the unit does not operate at all
 
    − 
− −  − 
Outdoor unit . . . The LEDs on the printed circuit
board flash and operation stops
 2. The main power is turned on while the power supply
wires between the indoor unit(s) are not connected
(open circuit at section B)
Symptom:
Same as above. If operation continues, an abnormality
will occur on the refrigeration cycle and operation will
stop.
↓
 
    − 
− −  − 
Remote control. . . “CHECK” flashes
 
    − 
− −  − 
Indoor unit (master). . . The LEDs on the printed
circuit board flash
 
    − 
− −  − 
Indoor unit (slave) . . . The LEDs on the printed
circuit board do not illuminate and the unit does not
operate at all
 
    − 
− −  − 
Outdoor unit . . . The LEDs on the printed circuit
board flash and operation stops 3. The main power is turned on while the remote control
connection cord is not connected (open circuit at section
C)
Symptom:
 
    − 
− −  − 
Remote control unit . . . Display of “No powersupply ”
 
    − 
− −  − 
Indoor unit (master). . . LED1 on the printed circuit
board stays illuminated and the unit does not
operate
 
    − 
− −  − 
Indoor unit (slave) . . . LED1 on the printed circuit
board stays illuminated and the unit does not
operate
 
    − 
− −  − 
Outdoor unit . . . LED1 on the printed circuit board
stays illuminated and the unit does not operate
Remedy
 1. Turn off the main power.
↓
 2. Conne ct the disconnected wires correctly.
↓
 3. Turn the main power back on.
↓
 4. After 1 minute, start operation using the remote control.
(Indoor units . . . Operation will start according to the
remote control setting.)
(Outdoor unit...Operation will start after 3-5 minutes.)
If slave units do not operate even after the wiring has been
corrected (automatic addressing is not possible)
 1. Check that DIP switches 1 to 4 and DIP switch 8 are all
set to OFF, and then stop operation.
↓
 2. Press the ADDRESS RESET button(SW3) at the
outdoo r unit for approximately 4 seconds
(The self-diagnosis LEDS 2 to 8 will illuminate in order,
and the system is reset once they are all illuminated.)
The above procedure cannot be used to carry out automatic
address resetting during group control.
50