Panasonic Cs W18bd3n Cs W24bd3n Cs W28bd3n Series Repair Manual

							Function Automatic address resetting fortwinsystem s
 
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This clears the current twin addresses which have been set automatically , and causes automatic twin address setting to be
carried out once more.
Procedure:Press the ADDRESS RESET switch SW3 (push button switch) on the outdoor unit circuit board continuously until LEDs 2 to 8 on
the outdoor unit circuit board are all illuminated (takes approx. 3.5 seconds).
Operation:The outdoor unit will reset the addresses for the indoor units which it is connected to, and will send an instruction to carry out
automatic address setting again. If the indoor unit DIP switches have not been manually set for twin address setting, the indoor
units receive this command and they then clear their existing settings and carry out automatic address setting.
If an indoor unit has had its address set by the DIP switch (DIP switch 1-8 is ON), or if the remote control unit is connected to one
of the indoor units, then the addresses for those indoor units cannot be reset.
 
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The indoor units will not run for approximately 1 minute while automatic twin address resetting is being carried out.
 
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Do not turn off the power supply for at least 1 minute afterautomatic twin address resetting has been carried out.
17.2. Piping connections
 
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The following table shows the pipe diameters for a twin-type system.
Outdoor unit main pipe diameter (mm)Indoor unit combinations
34BBIndoor unit capacity (HP)18BD318BD3
Liquid side:ø 9.52Branch pipe
diameterLiquid sideø 6.35ø 6.35
Gas side:ø 15.88Gas sideø 12.7ø 12.7
43BBIndoor unit capacity (HP)24BD324BD318BD328BD3
Liquid side:ø 9.52Branch pipe
diameterLiquid sideø 6.35ø 6.35ø 6.35ø 9.52
Gas side:ø 19.05Gas sideø 15.88ø 15.88ø 12.7ø 15.88
 
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The following table shows the equivalent pipe lengths and height differences for twin systems
Equivalent lengthL + la + lbWithin 50 m
Branch pipe diameterla, lbWithin 15 m
Branch pipe differencela - lbWithin 10 m
Height differenceH1Within 30 mHeight difference between indoor unitsH2Within 1 m
NOTE :
 1. Use the main pipe to gain any rise or fall required for the pipes.
 2. The numbe r of bends should be 8 or less in a single system (L + la, L + Ib), and 15 or less overall.
 3. Branch pipes should be positioned horizon tally.
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The branch pipe should be horizon tal to or perpendicular to the indoor unit.
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Installing branch pipes
17.3. Refrigerant charging
 
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For twin systems
The pipe length is the total of the branch pipe (L) and the junction pipes (Ia→
tIb→
t Ic in order from the thickest diameter). At
the point where the pipe length exceed s 30 m, determine the amoun t of refrigerant for the remaining liquid-side pipe diameters
and pipe lengths from the following table in order to charge the system.
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							17.4. Wiring
Whenboth indoor and outdoor unit draw power
(Example: 3 Phase power supply model)
When only theoutdoor unit draws power
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							18 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.
 
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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:
 
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W ait one minute after turning on the indoor unit power supply before operating theremote control.
 
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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.
 
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Do not connect anythin g except a relay to the timer input or fan speed output (connector CNT1 on printed circuit board).
 
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Do not connect U-NET transmission wires to terminals 3 and 4 of the indoor and outdoor units. (*1)
 
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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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							19.1. Test operation
 
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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).
 
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Never turn on the power supply until all installa tion work has
been completed.
 
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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.)
 
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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.)
 
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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.)
 
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Carry out test operation for 5 minutes or more using the
remote control or the switch on the outdoor unit printed
circuit board.
 
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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.
19 TEST OPERATION AND SELF DIAGNOSIS
19.2. Test operation from the outdoor unit
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							19.3. Test operation using the wired remote control
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							!
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Self-diagnosis error code table
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							20 SETTING OF SAVE ENERGY AND THERMISTOR SWITCH
20.1. 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.
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							21 GROUP CONTROL
1 Setting group for 1 remote control unit
 
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W hen using a remote control thermostat, the thermostat setting is used for all indoor units in the group.
 
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During group control, up to a maximum of 16 indoor units can be connected. (Do not mix heat pump units and cooling only
units.)
 
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Do not mix manua l settings and automatic settings. (Manual settings take priority.)
 
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The master unit and slave units can all be centrally controlled during group control.
Automatic setting for group control
 
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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:
 
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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.
 
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W hen address numbe rs are set automatically , you will not know which address numbe r corresponds to which indoor unit.
 
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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
 
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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.)
 
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Repeat the procedure in steps (1) to (4) to change the setting again.
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