Panasonic Cs C9dkzw Cu 2c18dkh Cu 3c20dkh Repair Manual

							4.2. Outdoor Unit
11
CS-C9DKZW CU-2C18DKH / CS-C9DKZW CU-3C20DKH 
						

							5 Refrigeration Cycle Diagram
12
CS-C9DKZW CU-2C18DKH / CS-C9DKZW CU-3C20DKH 
						

							6 Block Diagram
13
CS-C9DKZW CU-2C18DKH / CS-C9DKZW CU-3C20DKH 
						

							14
CS-C9DKZW CU-2C18DKH / CS-C9DKZW CU-3C20DKH 
						

							7 Wiring Diagram
15
CS-C9DKZW CU-2C18DKH / CS-C9DKZW CU-3C20DKH 
						

							16
CS-C9DKZW CU-2C18DKH / CS-C9DKZW CU-3C20DKH 
						

							8 Operation Details
8.1. Cooling Operation
 • Cooling operation can be set using remote control.
 • This operation is applied to cool down the room temperature reaches the setting temperature set on the remote control.
 • The remote control setting temperature, which takes the reading of intake air temperature sensor, can be adjusted from 16°C
to 30°C.
 • During cooling operation, the compressor will stoprunning and restart as shown in below figure.
8.1.1. Cooling Operation Time Diagram
17
CS-C9DKZW CU-2C18DKH / CS-C9DKZW CU-3C20DKH 
						

							8.2.1. Soft Dry Operation Time Diagram
8.2. Soft Dry Operation
 • Soft Dry operation can be set using remote control.
 • Soft Dry operation is applied to dehumidify and to perform a gentle cooling to the room.
 • This operation starts when the intake air temperature sensor reaches the setting temperature on the remote control.
 • W hen operation begin, Soft Dry will switched “ON” for a maximum 10 minutes, then Soft Dry operation will turned “OFF” for a
minimum 6 minutes. After that, the Soft Dry operation will be “ON” and “OFF” based on the setting temperature as shown in
below figure.
 • However after 3 minutes of compressor off, duringSoft Dry “OFF” (within 6 minutes Soft Dry restart control), the indoor unit will
start to operate at normal Cooling mode if the intake temperature is higher than Cooling “ON” point.
18
CS-C9DKZW CU-2C18DKH / CS-C9DKZW CU-3C20DKH 
						

							8.3. Automatic Operation
 • Automatic operation can be set using remote control.
 • This operation starts to operate with indoor fan at SLo speed for 20 seconds to judge the intake air temperature.
 • After judged the temperature, the operation mode is determined by referring to the below standard.
 • Then, the unit start to operate at determined operation mode, until it is switched off using remote control, with the setting
temperature as shown in below table.
 • The setting temperature for all the operations can be changed one level up or one level down from the standard temperature
as shown in below table by pressing on the temperature up or temperature down button at remote control.
 • The operation mode judging temperature and standard setting temperature canbe increased by 2°C permanently, by open the
circuit of JX1 at indoor electronic controller.
19
CS-C9DKZW CU-2C18DKH / CS-C9DKZW CU-3C20DKH 
						

							8.4. Operation Control
8.4.1. Restart Control (Time Delay Safety Control)
 • 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 balancethe pressure inside the refrigerant cycle.
8.4.2. 7 Minutes Time Save Control
 • The compressor will startautomatically if it has stopped for 7 minutes and the intake air temperature falls between the
compressor ON temperature (A) and compressor OFF temperature (B) during the period.
 • This phenomenon is to reduce thebuilt up humidity inside a room.
8.4.3. 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.
 • 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.
8.4.4. 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 isto reduce thestarting current flow.
20
CS-C9DKZW CU-2C18DKH / CS-C9DKZW CU-3C20DKH