Panasonic Cs W18bd3p Cs W24bd3p Cs W28bd3p Series Repair Manual

 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...

Procedures of deleting memory attwincontrol system
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. 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).
 1. Set the “OFF” position for main power supply switch.
 2. Set the “ON” position for No. 1 pin to No....

Emergencyoperation
 
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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...

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...

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...

(*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 outdoor 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.)
25.4. Hot starting
1. When heating mode operation starts
 1....

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°).
 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...

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...

25.8. Indoor thermostat characteristic
 1. Thermostat characteristic during cooling and heating modes
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