DOWNLOAD Panasonic CS-A7HKD / CS-A9HKD / CS-A12HKD / CU-A7HKD / CU-A9HKD / CU-A12HKD Service Manual ↓ Size: 12.64 MB | Pages: 78 in PDF or view online for FREE

45

• This operation provides clean air by producing negative ions to attract dust captured at the positively charged active e-ion filters.

• e-ion operation start condition

- During unit running at any operation mode, if “e-ion” button is pressed, combination operation (operation mode + e-ion

operation) starts.

- During unit is OFF, if “e-ion” button is pressed, e-ion individual operation starts.

• e-ion operation stop condition

- When “OFF/ON” button is pressed to stop the operation.
- When “e-ion” button is pressed again.
- When “Patrol” button is pressed.
- When OFF Timer activates.

• e-ion operation pause condition

- When indoor fan stop (during deice, odor cut control, thermostat off, etc.). e-ion operation resume after indoor fan restarts.
- When indoor intake temperature   40°C. e-ion operation resume after indoor intake temperature < 40°C continuously for 30

minutes.

• Indoor fan control

- During any operation mode combines with e-ion operation, fan speed follows respective operation mode.
- During e-ion individual operation — only Auto Fan Speed and no Powerful operation is allowed. Even if Fan Speed button is

pressed, no signal is sent to air conditioner, and no change on LCD display.
Auto Fan Speed for e-ion operation switches between HLo and CLo at pattern below:

• Airflow direction control

- During any operation mode combines with e-ion operation, air flow direction follows respective operation mode.
- During e-ion individual operation, only Auto Air Swing is allowed. Even if Air Swing button is pressed, no signal is sent to air

conditioner, and no change on LCD display.

• Timer control

- When ON timer activates when unit stops, previous operation resumes without e-ion operation.
- When ON timer activates during any operation, no change and carry on current operation.
- When OFF timer activates during any operation, all operation stops.

46

• Indicator

- When e-ion operation starts, e-ion indicator ON.

• Remote Control Receiving Sound

- Normal Operation

→ e-ion Operation

: Beep

- e-ion Operation

→ Normal Operation

: Beep

- Stop

→ e-ion individual Operation

: Beep

- e-ion individual Operation

→ Stop

: Long Beep

• Power failure

- During e-ion individual operation, if power failure occurs, after power resumes, e-ion individual operation resumes

immediately.

- During combination operation, if power failure occurs, after power resumes, combination operation resume immediately.
- e-ion operation status is not memorized after OFF the unit. After OFF, when the operation is ON again, air conditioner

operates without e-ion operation.

• e-ion Check Mode

- To check if e-ion is malfunctioning, during e-ion operation press e-ion button for 15 seconds and release to enter e-ion Check

Mode and supplies power to the Active e-ion Air Purifying System.

- If abnormal discharge is detected at filter (short-circuited) due to water or dust adhesion, etc., the e-ion indicator blinks

immediately.

• Error Detection Control

When e-ion indicator blink, it indicates error listed below:

- Active e-ion Air Purifying system PCB main connector open:

• Judgment Method

- During e-ion operation (include during Patrol operation), active e-ion Air Purifying system main connector to PCB is

opened.

• Troubleshooting Methods

- Connect the connector or stop operation (include during Patrol operation) to cancel the blinking.

- Abnormal Discharge error:

• Judgment Method

- During e-ion operation, feedback voltage is-Lo (at microcontroller) is detected, it is judged abnormal discharge and

stops power supplies to the active e-ion Air Purifying system.

- Abnormal discharge is caused by ionizer or filter’s high voltage power supply short-circuits due to water or dust

adhesion, and so forth.

- When abnormal discharge occurred, every 30 minutes the unit supplies power to the active e-ion Air Purifying system.
- When abnormal discharge occurs for 24 times continuously, e-ion indicator blinks (not applicable for e-ion Check Mode,

where the error will shows immediately despite the 24 times counter)

• Troubleshooting Method

- Press “e-ion” button or “OFF/ON” button to stop the operation and check the active e-ion Air Purifying system main

connector to PCB.

- After that, press “e-ion” button again to confirm the e-ion indicator not blinking.
- The 24 times counter will be clear after 10 minutes of normal operation or when operation stops.

• Error Reset Method

- Press “OFF/ON” button to OFF the operation.
- Press “AUTO OFF/ON” button at indoor unit to OFF the operation.
- OFF Timer activates
- Press “e-ion” button during e-ion individual mode.
- Power supply reset

- Active e-ion Air Purifying system breakdown error:

• Judgment Method

- When hi-feedback voltage (at microcontroller) supplied to filter during e-ion stop, active e-ion Air Purifying system

breakdown error shows immediately.

- It is due to indoor PCB or filter’s high voltage power supply damage.
- Operations except e-ion continue. Both Timer indicator and e-ion indicator blink.

• Troubleshooting Method

- Press “e-ion” button or “OFF/ON” button to stop the operation.
- Change main circuit board or filter’s high voltage power supply.
- When lo-feedback voltage supplied to active e-ion Air Purifying system during e-ion operation, e-ion indicator and Timer

indicator stop blinking.

47

• When the thermo-off temperature (temperature which compressor stops to operate) is reached during:-

- Cooling/Heating operation - the compressor stops for 3 minutes (minimum) before resume operation.
- Soft Dry operation - the compressor stops for 6 minutes (minimum) before resume operation.

• If the operation is stopped by the remote control, the compressor will not turn on within 3 minutes from the moment operation

stop, although the unit is turn on again within the period.

• This phenomenon is to balance the pressure inside the refrigerant cycle.

• The compressor will start automatically if it has stopped for 7 minutes and the intake air temperature falls between the

compressor ON temperature and compressor OFF temperature during the period.

• This phenomenon is to reduce the built up humidity inside a room.

• Once the air conditioner is turned on, the compressor will not stop within 60 seconds in a normal operation although the intake air

temperature has reached the thermo-off temperature. However, force stop by pressing the OFF/ON operation button at the
remote control is permitted.

• The reason for the compressor to force operate at minimum 60 seconds is to allow the refrigerant oil run in a full cycle and return

back to the outdoor unit.

• When the compressor, outdoor fan motor and indoor fan motor are simultaneously started, the indoor fan motor will start to

operate at 1.6 second later.

• The reason of the difference is to reduce the starting current flow.

• To protect indoor heat exchanger from freezing and to prevent higher volume of refrigerant in liquid form return to compressor.
• This control will activate when the temperature of indoor heat exchanger falls below 2

°C continuously for more than 4 minutes.

• The current fan speed will change to freeze prevention speed after 70 seconds compressor on. When indoor pipe temperature

reaches certain temperature for 5 sec. the speed will be increased as in below figure.

• Compressor will turn off when indoor temperature falls below 2

°C for more than 4 minutes. It will restart again when indoor heat

exchanger temperature rises to 10

°C.

• Restart control (Time Delay Safety Control) will be applied in this control.

48

• If the compressor is operating continuously for 5 minutes or longer and the temperature difference between intake air and indoor

heat exchanger is 2.5

°C (cooling mode)/5°C (heating mode) or less for continuous 2 minutes, compressor will stop and restart

automatically.

• Time Delay Safety Control is activated before the compressor restart.

• To prevent dew formation at indoor unit discharge area.
• This control will be activated if:-

- Cooling mode or Quiet mode.
- Remote Control setting temperature is less than 25

°C.

- Fan speed is at CLo or QLo.
- Room temperature is constant (±1

°C) for 30 minutes.

- Compressor is continuously running.

• Fan speed and angle of horizontal louver (vertical airflow angle) will be adjusted accordingly in this control.

- Fan speed will be increased slowly if the unit is in quiet mode but no change in normal cooling mode.
- The angle of horizontal louver will be changed as below figure.

• Dew prevention stop condition

- Remote control setting temperature is more than 25

°C.

- Fan speed is not set to CLo or QLo.
- Select Powerful operation.

• The compressor will start automatically if it has stopped for 30 minutes and the intake air temperature falls between the

compressor OFF temperature and compressor ON temperature during the period.

• This is to maintain the room temperature as set. Despite of this, it is to prevent a wrong judgement of intake air temperature due

to poor installation near the sensor area.

T = Intake air temperature - Indoor heat exchanger temperature

• This is to prevent compressor from rotate reversely when there is an instantaneous power failure.

Airflow direction auto control

Airflow direction manual control