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Panasonic Cs W18bd3n Cs W24bd3n Cs W28bd3n Series Repair Manual

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    							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 since defrosting was completed.
    After cancellation, the PREH EAT 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 >
    < When hot startoperation is cancelled by time >
    24.5. 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.
    81 
    						
    							24.6. 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.)
    24.7. 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 reversing 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.)
    82 
    						
    							24.8. Indoor thermostat characteristic
     1. Thermostat characteristic during cooling and heating modes
    83 
    						
    							85 
    						
    							24.9. Indoor unit fan control
     1. Fixing at LO, MED or HI
    When LO, MED or HI isset, the relay switches and operation is carried out at that setting.
     2. Automatic fan speed
    When set toAUTO, the indoor unit fan operation changes as shown in the table below.
    24.10. Forced operation during restart
    The compressor will not stop operating for 3 minutes after cooling mode or heating mode operation starts, even if the indoor unit
    thermostat turns off. (However, the compressor will stop operating during this time if the indoor unit air intake temperature exceeds
    33°C during heating mode operation or if the indoor unit air intake temperature drops below 16°C during cooling mode operation.)
    24.11. Outdoor unit fan excess heat dissipation control
     1. Start
    Carried out when the compressor switches from on to off (when the remote control unit is used to stop operation)
     2. Operation
    The outdoo r unit fan runs at SUPER HI speed for approximately 60 seconds and then stops.
    24.12. Discharge temperature control
     1. Operation
    When thedischarge temperature sensor detects a temperature of 100°C or higher during cooling mode operation, the liquid
    bypass valve is turned on.
     2. Cancelling
    When thedischarge temperature sensor detects a temperature of 70°C or lower, the liquid bypass valve is turned off.
    24.13. Emergency operation
    When the emergency operation switch(DSW1) on the outdoor unit printed circuit board is set to the emergency setting, then
    emergency operation is enable d. This allowsnormal operation to continue, with all abnormalities other than a discharge
    temperature abnormality, high pressure abnormality or overcurrent abnormality being ignored.
    86 
    						
    							24.14. DIP switch settings
     
        • 
    • •  • 
    Indoor unit printed circuit board (DSW1)
    87 
    						
    							25 INSTALLATION (INDOOR UNIT)
    88 
    						
    							89 
    						
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