Panasonic Cs W50bd2p Cu V50bbp8 Cu W50bbp8 Repair Manual

							 1. Automatic address setting (no need to have dip-switch set)
If the wiring connected properly as above example, the address is set automatically by the main powersupply. An indoor unit
with remote control will be set as the master. If the power source is installe d to indoor units and outdoor separately, turn on the
switch as the following procedure: outdoo r unit, indoor unit with control, and other indoor units.
When theslave units do not operate (when address cannot be set)
Important: The address for the group control cannot be reset, using the above mentioned procedure.
 2. Manua l address setting (by dip-switchDSW1)
When you set theaddress manua lly, set the dip-switch of the PC board in the indoor unit as follow:
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							 1. Automatic address setting (no need to have dip-switch set)
If the wiring connected properly as above example, the AC numbe rs are set automatically by the main powersupply . An indoor
unit with remote control will be set as the master.
If the power source is installe d to indoor units and outdoo r separately, turn on the switch as the following procedure: outdoo r
unit, indoor unit with controller, and other indoor units. The AC numbe r will be set at random.
 2. Manua l address setting (by dip-switchDSW1)
When you set theaddress manua lly, set the dip-switch of the PC board in the indoor unit as follow:
 3. Manua l address setting (by dip-switchDSW1)
When you set theaddress manua lly, set the dip-switch of the PC board in the indoor unit as follow:
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							Procedures of deleting memory attwincontrol system
 1. Set the “OFF” position for main power supply switch.
 2. Set the “ON” position for No. 8 pin of dip switch (DSW1) on indoor unit P.C. board.
 3. Take main power supply switch “ON” for one minute, and then main power supply switchoff.
 4. Set the “OFF” position for No. 8 pin of dip switch (DSW1).
Procedure of deleting memory at group control system
 1. Set the “OFF” position for main power supply switch.
 2. Set the “ON” position for No. 1 pin to No. 4 pin of dip switch (DSW1) on indoor unit P.C. board.
(No. 8 pin of dip switch (DSW1)should be “OFF” position)
 3. Take main power supply switch “ON” for one minute, and then main power supply switchoff.
 4. Set the “OFF” position for No. 1, No. 2, No. 3 and No. 4 pin of dip switch (DSW1).
(Important notice)
Above procedures are for deletin g memory on indoor unit P.C. board. And it is not for Address reset.
23.1. Indoor unit P.C. board layout.
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							Emergencyoperation
 
    • 
• •  • 
Emergency operation of outdoor unit
Emergency operation can be carried out by setting the
DSW1 switch on the printed circuit board inside the outdoo r
unit to the EMERGENCY position. However, emergency
operation is only carried out when an abnormality is
detected by the indoor/outdoor temperature thermistors.
The resistance values of each thermistor are measured as
shown in the table below to determine if there is an
abnormality.
Thermistor resistance table
Temperatu reResistance value (kΩ
)±5%
Room temperature
thermistorPipe temperature
thermistor
-20°C205.8197.8
-10°C114.6111.9
-5°C87.385.4
0°C67.065.8
5°C51.851.0
10°C40.439.9
15°C31.730.7
20°C25.125.0
25°C20.020.0
30°C16.116.0
40°C10.410.6
50°C6.97.1
60°C4.74.9
70°C___3.5
80°C___2.5
90°C___1.8
100°C___1.4
The pipe temperature thermistor resistance value are the same
for the indoor and outdoor units.

 
    • 
• •  • 
Set only the thermistor which shows an abnormality to the
condition shown in the table below to carry out emergency
operation
ThermistorCooling modeHeating mode
Indoor unitRoom temperatureFixed at 25°C
Room temperatureShortedOpen
ThermistorCooling modeHeating mode
Outdoor unitDischarge
temperatureOpenShorted
Heat exchanger
outlet temperatureShortedOpen
 
    • 
• •  • 
Refer to the circuit diagram for the connection locations for
each thermistor.
 
    • 
• •  • 
If there is an abnormality in the roomtemperature
thermistor, the temperature will be fixed at 25°C regardless
of the remote control unitdisplay .
NOTE:
 
    • 
• •  • 
Any abnormalities detected by the temperature thermistors
are ignored during emergency operation, so that long-term
operation in this mode should be avoided.
 
    • 
• •  • 
After emergency mode operation has been completed and
normal operation is to be resumed, turn the power supplie s
for the indoor and outdoor units off and return the DIP
switch to the NORMAL position.
 
    • 
• •  • 
Self-diagnosis LEDS 4 to 6 will flash during emergency
operation.
24 EMERGENCY OPERATION
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							25 CONTROL
25.1. Description of basic Functions
25.1.1. Cooling mode operation time chart
(*1)
Outdoor unit fan start control during cooling
At the start of cooling mode and drying mode operation, the outdoo r unit heat exchan ger outlet temperature is detected in order
to set the fan speed.
Operation is carried out at the fan speed detected for 30 seconds.
After 30 seconds, the heat exchan ger outlet temperature is detected and the outdoo r unit fan speed is changed automatically .
(*2)
Cooling low outdoor temperature protection
When theheat exchan ger outlet temperature drops to less than 12°C for a continuous period of 10 minutes, the outdoor unit stops
running.
This is cancelled after 3 minutes (re-start prevention)
 
    • 
• •  • 
Remote control display s and indoor unit operation continue during thistime.
 
    • 
• •  • 
The 10-minute countdown is cleared if the compressor stops or if the temperature at the outdoor unit outlet rises to 13.5°C or
higher.
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							25.2. Freezing prevention control
 1. Operation
During cooling mode operation, after 9 minutes have passed since the compressor turned on, the outdoor units stops operating
when the temperature detected by the indoor unit pipe temperature sensor is 2°C or lower.
The indoor unit continues operating at the fan speed set by the remote control unit. (The remote control unitdisplay does not
change.)
 2. Cancelling
This control is cancelled when the temperature detected by the indoor unit pipe temperature sensor is 15°C or higher.
(If the outdoor unit stops even though the temperature is 15°C or higher, restart prevention control will activated and the outdoor
unit will not start again for 3 minutes.)
(The 9-minute countdown is cleared while the compressor is stopped.)
(The above illustration shows the operation when there are no conditions for turning the outdoor unit off other than freezing
prevention.)
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							25.3. Heating mode operation time chart (Heat pump type only)
(*2)
Outdoor unit fan control during heating mode operation
Under conditions when the compressor is on during heating mode operation (except during defrosting and
when the liquid bypass valve is on), the outdoo r unit fan is controlled by means of input (CN2) indicating
whether the contact of the heating pressure switch on the outdoor unit circuit board is open or closed
(At the start of heating mode operation, the fan operates at HI speed.)
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							25.4. Hot starting
1. When heating mode operation starts
 1. Start
Hot start control commences heating mode operation starts.
 2. Operation
“PREHEAT” appears on the remote controldisplay . (Other display s remain unchanged.)
At the indoor unit, the indoor unit fan stops. In additio n, during hot starting, the louvre stays at the horizon tal
position (angle 0°).
 3. Cancelling
After 1 minute has passed since heating mode operation started, or if the compressor has turned on, hot
starting is cancelled when the temperature detected by the indoor unit pipe temperature sensor is 18°C
or higher.
After cancellation, the “PREHEAT” display on theremote control disapp ears and the louvre operation
returns to the previous setting.
(However, for 2 minutes after cancellation, the indoor unit fan operates at LOW speed, and then returns to
the previous setting.)

2. When defrosting is complete
 1. Start
Hot start control commences when defrosting is complete.
 2. Operation
“PREHEAT” appears on the remote controldisplay . (Other display s remain unchanged.)
At the indoor unit, the indoor unit fan stops. In additio n, during hot starting, the louvre stays at the horizon tal
position (angle 0°).
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							 3. Cancelling
Hot starting is cancelled when the temperature detected by the indoor unit pipe temperature sensor is 18°C
or higher, or after a maximum 1 minute has passed since defrosting was completed.
After cancellation, the “PREHEAT” display on theremote control disapp ears and the louvre operation
returns to the previous setting.
(However, the indoor unit fan operates at LOW speed for 2 minutes after cancellation, and then returns to
the previous setting.)
< When hot startoperation is cancelled by temperature >
25.5. Indoor unit fan control when thermostat is off during heating mode
operation
When the thermostat of the indoor unit turns off during heating mode operation, the indoor unit fan operates for 2 minutes at LOW
and then stops. In additio n, 5 minutes after the thermostat of the indoor unit turns off, the indoor unit fan again runs at LOW for 10
seconds, and at 3-minute intervals after that it switches back to LOW operation for 10 seconds.
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							25.6. Excess heat dissipation for indoor unit
The indoor unit fan continues operating for 30 seconds after heating mode operation turns off in order to
dissipa te excess heat.
 1. Whenheating mode operation has stopped
(LOWoperation for 30 seconds)
 2. Whenoperation is set to a mode other than heating by means of the OPERATION MODE switch
 3. If operation starts again during the 30 seconds mentioned in (1) above
(The fan operates at LOW speed for the remainder of the 30 seconds in (1), and then hot start commences.)
25.7. Defrost mode operation time chart
 1. Start and completion of defrosting
 a. Start
During heating mode operation (including automatic heating), after the 45-minute defrostingcycle time has
passed, defrosting starts if the temperature detected by the outdoor unit heat exchan ger outlet sensor is
2°C or lower for a continuous 5-minute period.
However, if the outdoo r unit fan is stopped, the start of defrosting will be delaye d by 5 minutes.
The defrosting cycle is 50 minutesfrom the start of heating mode operation.
 b. Completion
Defrosting mode operation stops 12 minutes after it starts, or if the temperature detected by the outdoor
unit heat exchan ger outlet sensor is 25°C or higher.
After defrosting is complete, hot starting commences.
 c. Forced defrosting
If P8 on the outdoor unit circuit board is shorted while the compressor is ‘ON’ during heating mode operation
and the temperature detected by the outdoor unit heat exchan ger outlet sensor is 25°C or lower, defrosting
is carried out regardless of the current starting conditions.
 2. Operation
 a. During defrosting, the outdoor unit turns on the compressor and turns off the outdoor unit fan and the rever-
sing valve.
 b. The indoor unit fan operates at LOW for 30 seconds after defrosting starts. After this, the indoor unit fan turns off until
defrosting is complete.
(During defrosting, the louvre of the indoor unit stays at the horizon tal.)
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