Panasonic CS-YW7MKD / CS-YW9MKD / CS-YW12MKD / CS-YW7MKD-1 / CS-YW9MKD-1 / CS-YW12MKD-1 / CU-YW7MKD / CU-YW9MKD / CU-YW12MKD / CU-YW7MKD-1 / CU-YW9MKD-1 / CU-YW12MKD-1 Service Manual ▷ View online
29
z
During Heating operation:-
f the compressor has been continuously running for 5 minutes or longer, and the difference of temperature between
intake air and evaporator is continuously lower than 5 ℃ or below for 2 minutes, the compressor will stop, and then
restart 3 minutes later. (Time Delay Safety Control is effective.)
intake air and evaporator is continuously lower than 5 ℃ or below for 2 minutes, the compressor will stop, and then
restart 3 minutes later. (Time Delay Safety Control is effective.)
△ T= Intake air temperature – Indoor heat exchanger temperature
11.7 Dew Prevention Control
z
To prevent dew formation at indoor unit discharge area, the horizontal air vane is automatically set at position 2
(refer to 9.6).
(refer to 9.6).
z
This control is activated when:-
*Compressor runs continuously for 60 minutes.
*Horizontal air vane is at position 4 or 5 (refer to 10.6).
*Actual fan speed is lower than Lo level.
*Intake air temperature is lower than 29℃
*Intake air temperature changes within 2℃ for more than 30 minutes.
*Horizontal air vane is at position 4 or 5 (refer to 10.6).
*Actual fan speed is lower than Lo level.
*Intake air temperature is lower than 29℃
*Intake air temperature changes within 2℃ for more than 30 minutes.
z
Dew prevention stops when:-
z
Any of the above condition is out of the range described above.
z
Operation stops.
z
Power OFF.
11.8 Overload Protection Control
During Heating operation:-
When temperature of indoor heat exchanger rise to 51’C, outdoor fan will stop.
When Temperature of indoor heat exchanger falls to 49’C, outdoor fan will restart.
When Temperature of indoor heat exchanger rises to 65’C or above, compressor stops, and will restart 4 minutes
later.
When temperature of indoor heat exchanger rise to 51’C, outdoor fan will stop.
When Temperature of indoor heat exchanger falls to 49’C, outdoor fan will restart.
When Temperature of indoor heat exchanger rises to 65’C or above, compressor stops, and will restart 4 minutes
later.
Compressor runs ≥ 5 min
△T≤ 5℃ last for 2 min
△T≤ 5℃ last for 2 min
Compressor stops
Compressor restarts 3 minutes later
Indoor Heat Exchanger ≥ 65’C
Compressor stops
Compressor restarts 4 minutes later
30
12. Servicing
Mode
12.1 Auto Off/On Button
1
AUTO OPERATION MODE
Auto Operation will be activated immediately once the Auto OFF/ON button is pressed. This operation can be
used to operate air conditioner with limited function if remote control is misplaced or malfunction.
Auto Operation will be activated immediately once the Auto OFF/ON button is pressed. This operation can be
used to operate air conditioner with limited function if remote control is misplaced or malfunction.
2
TEST RUN OPERATION (FOR PUMP DOWN/SERVICING PURPOSE)
The Test Run Operation will be activated if the Auto OFF/ON button is pressed continuously for more than 5
seconds. A “beep” sound will be heard at the fifth seconds, in order to identify the starting of this operation.
The Test Run Operation will be activated if the Auto OFF/ON button is pressed continuously for more than 5
seconds. A “beep” sound will be heard at the fifth seconds, in order to identify the starting of this operation.
3
REMOTE CONTROL RECEIVING SOUND OFF/ON MODE
z
To switch OFF the remote control receiving sound, press and hold "AUTO OFF/ON"
button for approximately 10 seconds until you hear 2 “beep” sounds. Release you hand.
Within 1 minutes, press this button again for approximately 10 seconds until you hear 2
“beep” sounds again, setting complete.
button for approximately 10 seconds until you hear 2 “beep” sounds. Release you hand.
Within 1 minutes, press this button again for approximately 10 seconds until you hear 2
“beep” sounds again, setting complete.
z
To switch ON the sounds, repeat above operation.
4
Random Auto Restart Function OFF/ON
z
Factory setting is ON.
z
To close this function, press and hold “AUTO OFF/ON” button for approximately 15
seconds until you hear 3 “beep” sounds. Release your hand and then press this button
again for 15 seconds until you hear 3 “beep” sounds again, setting complete. The step
should be completed within 1 minute.
seconds until you hear 3 “beep” sounds. Release your hand and then press this button
again for 15 seconds until you hear 3 “beep” sounds again, setting complete. The step
should be completed within 1 minute.
z
To recover this function, repeat above operation.
12.2 Remote Control Button
12.2.1 Mode selecting button
z
AUTO,HEAT, COOL, DRY, can be selected by pressing “MODE” button.
12.2.2 Temperature adjusting button
Temperature adjusting range is between 16 ℃~30 ℃
12.2.3 Fan speed button
There are 3 speed levels other than AUTO can be selected. The display on the remote controller changes as follows by pressing
the AIR SWING button.
the AIR SWING button.
12.2.4 AIR SWING button
To adjust vertical airflow directions by pressing AIR SWING button (5 options and AUTO)
Auto Operation
Test Run Operation
(Forced Cooling Operation)
Remote Control
Receiving Sound
OFF/ON
Random Auto Restart
OFF/ON
5 sec
10 sec
15 sec
ON
Beep
Beep x 2
Beep x 3
31
13. Troubleshooting
Guide
13.1 Refrigeration cycle system
In order to diagnose malfunctions, make sure that there are no
electrical problems before inspecting the refrigeration cycle. Such
problems include insufficient insulation, problem with the power
source, malfunction of a compressor and a fan. The normal outlet
air temperature and pressure of the refrigeration cycle depends on
various conditions, the standard values for them are shown in the
table on the right.
electrical problems before inspecting the refrigeration cycle. Such
problems include insufficient insulation, problem with the power
source, malfunction of a compressor and a fan. The normal outlet
air temperature and pressure of the refrigeration cycle depends on
various conditions, the standard values for them are shown in the
table on the right.
13.1.1
Normal Pressure and Outlet Air Temperature (Standard)
Gas Pressure
Mpa
(kg/cm
2
G)
Outlet air
Temperature
(°C)
Cooling Mode
0.6~0.96 ( 6~9.6)
12~16
Heating Mode 2.25~3.36(22.5~33.6)
36~45
Condition: Indoor fan speed = High
Outdoor temperature = 35°C at cooling mode
Outdoor temperature = 35°C at cooling mode
and 7°C at heating mode.
Different in the intake
and outlet
air temperatures
Normal
Value of electric current
during operation
Dusty condenser
preventing heat radiation
Excessive amount
of refrigerant
• Measuring the air
temperature different
• Measuring electric
current during operation
• Measuring gas side
pressure
More than 8°C
(15 minutes after an operation
is started) at cooling mode.
Above 14°C (15 minutes after
an operation is started.) at
heating mode
Less than 8°C at the cooling mode
Less than 14°C at the heating mode
Higher than specified
Lower than
specified
specified
Gas side
pressure
Inefficient compressor
Insufficient refrigerant
Clogged strainer or
capillary cube
Cooling
Mode
High
Low
Low
Inefficient compressor
Insufficient refrigerant
Clogged strainer or
capillary cube
Heating
Mode
Low
Low
Low
32
13.2 Relationship between the condition of the air conditioner and pressure
and electric current
Cooling Mode
Condition of the
air conditioner
Low Pressure
High Pressure
Electric current during operation
Insufficient refrigerant
(gas leakage)
Ô
Ô
Ô
Clogged capillary tube or
strainer
Ô
Ô
Ô
Short circuit in the indoor unit
Ô
Ô
Ô
Heat radiation deficiency
of the outdoor unit
Ò
Ò
Ò
Inefficient compression
Ò
Ô
Ô
• Carry out the measurement of pressure, electric current, and temperature fifteen minutes after an operation is started.
13.3 Diagnosis methods of a malfunction of a compressor
Nature of fault
Symptom
Insufficient compressing
of a compressor
z
Electric current during operation becomes approximately 20% lower thank the normal value.
z
The discharge tube of the compressor becomes abnormally hot (normally 70℃ to 90℃ )
z
The different between high pressure and low pressure becomes almost zero.
Locked compressor
z
Electric current reaches a high level abnormally, and the value exceeds the limit of an ammeter. In
some cases, a breaker turns off.
some cases, a breaker turns off.
z
Then compressor has a humming sound.
Click on the first or last page to see other CS-YW7MKD / CS-YW9MKD / CS-YW12MKD / CS-YW7MKD-1 / CS-YW9MKD-1 / CS-YW12MKD-1 / CU-YW7MKD / CU-YW9MKD / CU-YW12MKD / CU-YW7MKD-1 / CU-YW9MKD-1 / CU-YW12MKD-1 service manuals if exist.