Panasonic Cs W50btp Cu W50bbp8 Cu V50bbp8 Repair Manual

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							19.1. Twin and Triple Operation
 
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• •  • 
Simultaneous air conditioning of wide spaces and corners is
possible. Indoor units with different horsepowers can even
be used in combination.
 
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• •  • 
The master unit and slave units are set automatically when
the power is turned on. At this time, the indoor unit which is
connected to the remote control unit becomes the master
unit.
(If automatic setting is not possible, carry out the settings
manua lly.)
 
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• •  • 
No distinction is made between master unit and slave units
(slave unit 1 and slave unit 2) at the indoor unit or remote
control.
 
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• •  • 
Install the remote control to the master unit. (It cannot be
connected to slave units.)
If indoor unit models with louvres and models without
louvres have been connected together, use an indoor unit 
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• •  • 
Master unit and slave-units can be set automatically in twin
and triple systems. No address setting is necessary.
 
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Multiple indoor units can be operated simultaneousl y with a
single remote control unit. Note that individual operation is
not possible.
with louvres as the master unit.
 
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The remote control termostat can also be set.
 
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Optional circuit boards can only be installe d to the master
unit.
 
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Setting the master unit and slave units can also be carried
out manua lly by using DIP switches. However, manua l
settings will alwaystake priority. If you have made manua l
settings but would like to return to using automatic settings,
set all slave unit DIP switches (refer to the table below) to
the OFF position, and then press the ADDRESS RESET
button on the outdoor unit (SW3 on the outdoor unit printed
circuit board).
(Do not mix manua l settings and automatic settings.)
19 TWIN AND TRIPLE
19.1.1. Twin and triple operation setting
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							19.1.2. Automatic address setting fortwin
and triple systems
Procedure: Turn on the power supply for the indoor
and outdoor units.
Operation: Automatic address setting will start 10 to
30 seconds after the power supply is
turned on, and will be completed after
about 1 minute.
If the power supplies for the indoor unit and outdoor unit cannot be
turned on at the same time, turn on the power supply for the outdoor
unit, the indoor unit which is connected to the remote control, and then
the other indoor units in that order.
If the order of turning on the power supply is incorrect, the master unit
setting may overlap. In such a case, turn on the power supplies for all
units in the correct order as given above, or carry out a twin/triple
automatic address reset (press dip switch 3 on the outdoor unit
continuously for 4 seconds or longer).
 
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• •  • 
The indoor unit which is connected to the remote control will
have priority for becoming the master unit.
 
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The master unit thermostat will be used as the indoor
temperature thermostat. If the master unit thermostat is
turned on, the slave unit thermostats cannot be adjusted
even if they happen to be on.
 
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• •  • 
If address setting using the DIP switches is carried out after
automatic address setting has been carried out, use DIP
switch No. 3(SW3) on theoutdoo r unit to carry out
automatic address resetting.
 
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• •  • 
If you would like to designate a particular indoor unit as the
master unit because no master unit has been set, use the
DIP switches on the slave units to make setting.
If automatic address setting is carried out once and then the slave unit
address are set, the address will then be stored inside the EEPROM.
Thus it is not necessary to repeat automatic address setting if the
power is turned off and back on again.
19.1.3. DIP switch settings for twin/triple
slave unit addresses
Procedure: Turn off the power supply, and then set
DIP switch 1-8 to ON.
The unit will become slave unit 1.
(Set DIP switches 1-1 and 1-8 both to
ON.
The unit will become slave unit 2.)Turn on the power supply.
Operation: The unit will operate as slave unit 1.
Automatic address setting is not carried
out at this time.
If the setting is made while the power is still turned on, it is easier to
mis-combine the setting with group settings. So, the setting should be
made while the power is turned off.
 
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• •  • 
Only slave unit addresses can be set in this way. Master
unit setting is not possible.
 
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• •  • 
If you make the DIP switch settings after the power has
been turned on, carry out twin/triple automatic address
resetting.
 
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• •  • 
Be sure to set DIP switch 1-8 to ON when setting twin/triple
addresses. If DIP switch 1-1 is set to ON without setting 1-
8 to ON, group addresses will be set instead, and the
remote control open circuit error code (F26) will be
display ed.
19.1.4. Automatic address resetting for
twin/triple systems
Function: 
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• •  • 
This reset the current twin/triple
addresses which have been set
automatically , and result in the
reoccurance of automatic twin/triple
address settings.
Procedure: Press the ADDRESS RESET button SW3
(push button switch) on the outdoor unit
circuit board continuously until LEDs 2 to
8 on the outdoo r unit circuit board are all
illuminated (takes approximately 3.5
seconds).
Operations: 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 switch have not been
manua lly set for twin/triple address
setting, the indoor units receive this
command and 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 unit, then the addresses for those indoor units cannot be reset.
43 
						

							 
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• •  • 
The indoor units will not run for approximately 1 minute
while automatic twin/triple address resetting is being carried
out.
Note: 
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• •  • 
Do not turn off the power supply for at least 1 minute after
automatic twin/triple address resetting has been carried out.
19.2. 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
3HPIndoor unit capacity (HP)1.51.5
Liquid side:ø 9.52Branch pipe
diameterLiquid sideø 6.35ø 6.35
Gas side:ø 15.88Gas sideø 12.7ø 12.7
4HPIndoor unit capacity (HP)2.02.01.52.5
Liquid side:ø 9.52Branch pipe
diameterLiquid sideø 6.35ø 6.35ø 6.35ø 6.35
Gas side:ø 19.05Gas sideø 12.7ø 12.7ø 12.7ø 15.88
5HPIndoor unit capacity (HP)2.52.52.03.0
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
6HPIndoor unit capacity (HP)3.03.02.04.0
Liquid side:ø 9.52Branch pipe
diameterLiquid sideø 9.52ø 9.52ø 6.35ø 9.52
Gas side:ø 19.05Gas sideø 15.88ø 15.88ø 12.7ø 19.05
 
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• •  • 
The following table shows the pipe diameters for a triple-type system.
Outdoor unit main pipe diameter (mm)Indoor unit combinations
6HPIndoor unit capacity (HP)2.02.02.01.51.53.0
Liquid side:ø 9.52Branch pipe
diameterLiquid sideø 6.35ø 6.35ø 6.35ø 6.35ø 6.35ø 9.52
Gas side:ø 19.05Gas sideø 12.7ø 12.7ø 12.7ø 12.7ø 12.7ø 15.88
 
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The following table shows the equivalent pipe lengths and height differences for twin- and triple-type systems.
Equivalent lengthL + la + lb + lcWithin 50 m
Branch pipe diameterla, lb, (lc)Within 15 m
Branch pipe differencela - lb, lb - (lc), la - (lc)Within 10 m
Height differenceH1Within 30 mHeight difference between indoor unitsH2Within 1 m
 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 + lb, L + lc), and 15 or less overall.
 3. Branch pipes should be position horizon tally.
 
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The branch pipe shoud be horizon tal to or perpendicular to the indoor unit.
44 
						

							19.3. Refrigerant charging
 
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• •  • 
For twin and triple-type systems
The pipe length is the total of the branch pipe (L) and the junction pipes (la→
lb→
lc 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.
45 
						

							19.4. Wiring
46 
						

							20 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 toconpensate human error during installa tion.
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 been 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, connectthem
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 “TROUBLESH OOTING” chapter.
NOTE:
Do not allow any of the following connection, as such connection 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 control.
47 
						

							21.1. Test operation
 
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• •  • 
Always use a properly-insu lated tool to operate the switch
on the circuit board. (Do not use your finger or any 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 12 hours.
(The crankcase heater will be 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.
(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 operation first during test
operation, even during the warm season.
(If heating is carried out first, problems with operation of the
compressor will result.)
21.2. Test operation from the
outdoor unit
During outdoor unit emergency operation or test operation, the
LEDs on the printed circuit board will flash.
To cancel test operation, press the TEST RUN button once
more while test operation is being carried out.
(Test operation will stop automatically after 30 minutes have
passed.)
21.3. Test operation using the wired
remote control
 1. Check that “COOL” is display ed on the operation mode
display , and then press the OFF/ON button to start test
operation.
 2. Within 1 minute of pressing the OFF/ON button, press the
TEST RUN button.
 3. The pipe temperature (gas pipe) will then be display ed in
the temperature setting display of theremote control.
 
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• •  • 
During group control, the numbe r appearing in the timer
display will change each time the air conditioner No.
button is pressed, and the pipe temperature for the
indoor unit correspondin g to the numbe r display ed will
appear in the temperature setting display .
 4. Check that the temperature in the pipe temperature display
starts dropping after operation has been continuing for
some time.
21 TEST OPERATION AND SELF DIAGNOSIS
48 
						

							21.4. Test operation using the
wireless remote control
 1. Within 1 minute of pressing the OFF/ON button, press to
cooling operation and then press the TEST RUN button.
 
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• •  • 
If more than 1 minute passes, test operation cannot be
started. In this case, press the OFF/ON button once
more to repeat the operation.
 
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• •  • 
Use the OPERATION button to change the operation.
The current operation mode will appear in the operation
mode display .
 2. Whentest operation starts, “TEST RUN” will appear in the
timerdisplay of the LCD, and operation will be carried out in
accordance with the operation mode display (COOL or
HEAT) appearing at that time.
However, the numbe r in the temperature setting display will
not change.
(Cancelling test operation)
 
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• •  • 
Press the OFF/ON button, the TEMP (UP/DOWN) button,
the OPERATION button, the FAN SPEED button or the
TEST RUN button to cancel test operation.
21.5. Self-diagnosis function
 
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• •  • 
The wired remote controldisplay and the self-diagnosis
LEDs (red) on the outdoor unit printed circuit board indicate
where the abnormality has occurred.
 
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• •  • 
Recallin g the error display .

 
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− −  − 
The air conditioner No. “01” appears during normal
installa tion and use.Whenusing group control, a
different numbe r may appear. The air conditioner No.
can be display ed by pressing the air conditioner No.
button.
When an abnormality occurs at this unit, “CHECK” flashes
in the display .
Press the CHECK button while the display is flashing.
The timerdisplay will change and an error codefrom F15 to
F49 will appear in place of the time. (The temperature
setting display will also change to show the air conditioner
No.)
Press the TIMER SELECT/SET button while the error is
displayed.
The F15 - F49 display will change to the detail display .
 
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After checking the error display and the detail display , refer
to the self-diagnosis error code table on the following page
and check the location of the problem.
 
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If the problem is repaired and operation returns to normal,
the CHECK display on theremote control will be eliminated,
but the self-diagnosis LED will remain illuminated until the
operation starts again.
49 
						

							How to display the past error message
If the “CHECK” display on the wiredremote control is not
flashing, press the CHECK button continuously for 5 seconds
or more to display the problem details for the last problem or
the problem before that. You can then switch between the
display s for the previous problem and the problem before that
by pressing the TIMERFORWARD orBACK buttons.
(Last problem display : 1F15 - 1F49
Second-last problem display : 2F15 - 2F49)
Press the CHECK button once more to return to the normal
display .An error code from 1F15 to 1F49 will bedisplay ed.
(The temperature setting display will also change to show the
air conditioner No.)
If the TIMER SELEC T/SET button is pressed while the error
code from 1F15 to 1F49 is beingdisplay ed, the display screen
will change to show the details of the last problem display .
(If 2F15 to 2F49 is being display ed, the details of the second-
last problem display will appear.)
50