Panasonic CS-W18MKD / CS-W24MKD / CU-W18MKD / CU-W24MKD Service Manual ▷ View online
53
ECONAVI & AUTO COMFORT Sensor abnormality check mode
Purpose is to improve sensor serviceability when sensor is malfunction.
(1) Control starting condition
When all of the conditions are formed
Not in ECONAVI & AUTO COMFORT Demo mode.
ECONAVI & AUTO COMFORT mode ON.
When ECONAVI & AUTO COMFORT sensor check mode signal is received; the procedure of selection
is as shown:
Press “Set” button continuously for 15 seconds by using pointer to enter internal setting mode.
Press “Timer Decrement" button to select “CHC”.
Confirm setting by pressing “Timer Set” button, a “beep” sound will be heard.
SET
SET
Transmit Patrol default OFF/ON code
(Buzzer: OFF:Long Beep, ON:Short Beep)
(Buzzer: OFF:Long Beep, ON:Short Beep)
Press continously for 15s
SET
Transmit Patrol demo code
(Buzzer: OFF:Long Beep, ON:Short Beep)
(Buzzer: OFF:Long Beep, ON:Short Beep)
SET
Transmit ECO demo code
(Buzzer: OFF:Long Beep, ON:Short Beep)
(Buzzer: OFF:Long Beep, ON:Short Beep)
SET
Transmit check code
(Buzzer:Short Beep)
(Buzzer:Short Beep)
(2) Control ending condition.
When any of the conditions are formed
Operation
stops.
“Timer Cancel” button pressed.
When ECONAVI & AUTO COMFORT sensor check mode signal is not received for more than
30 seconds.
(3) Control content.
During ECONAVI & AUTO COMFORT mode ON, when check signal is received, if (1) or (2) is detected.
ECONAVI & AUTO COMFORT LED start blinking (ECONAVI & AUTO COMFORT sensor operation
stops but the unit operates as normal) and ECO Patrol sensor abnormal code is memorized (the 4 times
counter is ignored)
stops but the unit operates as normal) and ECO Patrol sensor abnormal code is memorized (the 4 times
counter is ignored)
The blinking of ECONAVI & AUTO COMFORT LED can be cancelled by pressing ECONAVI & AUTO
COMFORT button again.
Sensor error counter can be cleared only after power supply reset or “AC Reset” button on remote
control is pressed.
However, if there is no ECONAVI & AUTO COMFORT sensor abnormally happen, ECONAVI & AUTO COMFORT
sensor operation will continues as normal.
54
13. Protection
Control
(For 13.1 to 13.7 information applies only to Cooling and Soft Dry Operation)
13.1
Restart Control (Time Delay Safety Control)
When the thermo-off temperature (temperature which compressor stops to operate) is reached during:-
o
Cooling operation - the compressor stops for 3 minutes (minimum) before resume operation.
o
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.
13.2
7 Minutes Time Save Control
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.
13.3
60 Seconds Forced Operation
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.
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.
13.4
Starting Current Control
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.
13.5
Freeze Prevention Control
If the temperature of the indoor heat exchanger falls below 2°C continuously for 4 minutes or more, the
compressor turns off.
The fan speed setting remains the same.
The fan speed setting remains the same.
This phenomenon is to protect the indoor heat exchanger from freezing and to prevent higher volume of
refrigerant in liquid form returning to the compressor.
Compressor will restart again when the indoor heat exchanger temperature rises to 10°C (Recovery).
Restart control (Time Delay Safety Control) will be applied in this Control if the recovery time is too short.
55
13.6
Compressor Reverse Rotation Protection Control
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 or less for continuous 2 minutes, compressor will stop and restart
automatically.
automatically.
Time Delay Safety Control is activated before the compressor restart.
s T = Intake air temperature - Indoor heat exchanger temperature
This is to prevent compressor from rotate reversely when there is an instantaneous power failure.
13.7
Dew Prevention Control
To prevent dew formation at indoor unit discharge area.
This control starts if:
o
Cooling mode or Quiet mode is activated.
o
Remote Control setting temperature is less than 25°C.
o
Fan speed is at Lo or QLo.
o
Room temperature is constant (±1°C) for 30 minutes.
o
Compressor is continuously running.
Fan speed, angle of horizontal louver (vertical airflow angle) and angle of vertical louver (horizontal airflow angle)
will be adjusted accordingly in this control.
o
o
Fan speed will be increased slowly if the unit is in quiet mode and Lo fan speed.
o
The angle of horizontal louver will be changed as table below:
o
The angle of vertical louver will be changed as table below:
Dew prevention stop condition
o
Remote control setting temperature is more than 25°C.
o
Fan speed is not set to Lo or QLo.
o
Select Powerful operation.
(For 13.22 to 13.23 information applies only to Heating Operation)
13.8
Restart Control (Time Delay Safety Control)
When the thermo-off temperature (temperature which compressor stops to operate) is reached during:-
o
Heating operation - the compressor stops for 3 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.
13.9
Compressor Reverse Rotation Protection Control
If the compressor is operating continuously for 5 minutes or longer and the temperature difference between
indoor heat exchanger and intake air is 5°C or less for continuous 2 minutes, compressor will stop and restart
automatically.
automatically.
Time Delay Safety Control is activated before the compressor restart.
s T = Indoor heat exchanger temperature - Intake air temperature
This is to prevent compressor from rotate reversely when there is an instantaneous power failure.
56
13.10 Overload Protection Control
Outdoor
Fan
Control
o
If the temperature of the Outdoor Heat Exchanger less than -3°C, Outdoor Fan is ON. The Outdoor Fan stop,
when Outdoor Heat Exchanger temperature is Tb or more according to Outdoor Air Temperature region as
table below:
The Outdoor Fan restarts when the indoor heat exchanger temperature falls to 49°C.
table below:
The Outdoor Fan restarts when the indoor heat exchanger temperature falls to 49°C.
Outdoor Air
Temperature
< 10°C
≥ 10°C ~ < 15°C ≥ 5°C ~ < 20°C ≥ 20°C ~ < 25°C
≥ 25°C
Tb
≥ 5°C
≥ 3°C
≥ 1.5°C
≥ 0.5°C
≥ -0.5°C
Outdoor Fan
OFF
During starting of Heating mode and after deice, Outdoor Fan ON for 90 sec. (Hi).
Compressor High Pressure Control
o
If the indoor heat exchanger becomes 68°C or more, the compressor will stop and restart automatically.
o
Time Delay Safety Control is activated before the compressor restart.
13.11 4-Way Valve Control
4-way valve always on during Heating operation. (except deicing operation)
When the unit is switched off by remote control during Heating operation, the 4-way valve stay at Heating
position for 5 minutes.
This is to prevent the refrigerant flow process sound for being occur.
13.12 Hot Start Control
This operation is to prevent the Cold Draft during Heating mode operation.
The operation will start when compressor OFF (Thermo OFF) during Heating operation.
For the first 2 mins. from compressor OFF (Thermo OFF), Indoor fan speed will operate accordingly to the Indoor
heat exchanger temperature as shown below:
After 2 mins. from compressor OFF (thermo OFF), Indoor fan will run at SSLo speed only.
Anti Cold Draft Control will stop when:
o
Intake temperature < set temperature. (Time Delay Safety Control 4 minutes waiting is valid)
30 Minutes Time Save Control activates.
Click on the first or last page to see other CS-W18MKD / CS-W24MKD / CU-W18MKD / CU-W24MKD service manuals if exist.