Panasonic Cs W7dkr Cs W9dkr Cs W7dkr Series Repair Manual
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8.2. 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 stop running and restart as shown in below figure. 8.2.1. Cooling Operation Time Diagram 21 CS-W7DKR CU-W7DKR / CS-W9DKR CU-W9DKR / CS-W12DKR CU- W12DKR
8.3.1. Soft Dry Operation Time Diagram 8.3. Soft Dry Operation • Soft Dry operation can be set using remote control. • Soft Dry operation is applied to dehumidify and toperform 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 begins, Soft Dry will be switched“ON”for a maximum 10 minutes, then Soft Dry operation will be 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, during Soft 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. 22 CS-W7DKR CU-W7DKR / CS-W9DKR CU-W9DKR / CS-W12DKR CU- W12DKR
8.4. Automatic Operation • Automatic operation can be set using remote control. • This operation starts to operate with indoor fan at SLo speed for 25 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. • Operation mode will be determine again for judgement after 1 hour of operation, if the room temperature reaches to set temperature and compressor off time is over 7 minutes 30 seconds continuously. The present operation mode will be continued, if the room temperature does not reach to set temperature (Compressor keeps running) eventhough after 1 hour from automatic operation mode started. PresentJudgementNext Mode ModeCoolingSoft DryHeating OO Cooling23°CCooling(Judgement:Not Applicable(Judgement: Heating23°C & Above)Below 23°C) OO Soft Dry20°CSoft DryNot Applicable(Judgement:(Judgement: Heating20°C & Above)Below 20°C) OO HeatingCooling(Judgement:Not Applicable(Judgement: 25°CHeating25°C & Above)Below 25°C) • Automatic Set Temperature For each operation, set temperature will automatically set as shown below. • 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. OperationHi(Standard)Lo (+2°C)(±0°C)(-2°C) Cooling27°C25°C23°C Soft Dry24°C22°C20°C Heating23°C21°C19°C 23 CS-W7DKR CU-W7DKR / CS-W9DKR CU-W9DKR / CS-W12DKR CU- W12DKR
• The operation mode judging temperature and standard setting temperature can be increased by 2°C permanently, by open the circuit of JX1 at indoor electronic controller. 8.5. Operation Control (For 8.5.1 to 8.5.7 information appliesonly toCooling and Soft Dry Operation) 8.5.1. Restart Control (Time Delay Safety Control) • W hen the thermo-off temperature (temperature which compressor stops to operate) is reached during:- − Cooling 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. 8.5.2. 60 Seconds Forced Operation • Once the air conditio ner 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 fullcycle and return back to the outdoor unit. 8.5.3. 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 (A) and compressor OFF temperature (B) during the period. • This phenomenon is to reduce the built up humidity inside a room. 24 CS-W7DKR CU-W7DKR / CS-W9DKR CU-W9DKR / CS-W12DKR CU- W12DKR
8.5.4. Anti-Freezing Control • If the temperature of the indoor heat exchan ger falls below 2°C continuously for 4 minutes or more, the compressor turnsoff. The fan speed setting remains the same. • This phenomenon is to protect the indoor heat exchan gerfrom freezing and to prevent higher volume of refrigerant in liquidform returning to the compressor. • Compressor will restart again when the indoor heat exchan ger temperature rises to 10°C (Recovery). • Restart control (Time Delay Safety Control) will be applied in this Control if the recovery time is tooshort. 8.5.5. Compressor Reverse Rotation Protection Control • If the compressor is operating continuously for 5 minutes or longer and thetemperature differen ce between intake air and indoor heat exchan ger is 2.5°C (cooling mode) or less for continuous 2 minutes, compressor will stop and restart automatically. • Time Delay Safety Control is activated before the compressorrestart. T = Intake air temperature - Indoor heat exchanger temperature • This is to prevent compressor from rotate reversely when there is an instantaneous power failure. 8.5.6. Starting Current Control • W hen 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 differen ce is to reduce the starting current flow. 8.5.7. Anti-Dew Formation Control • Purpose is to prevent dew formation on indoor unit air discharge area. • W hen room temperature is constant (±1°C) the followin g conditio ns occur for 30 minutes continuously, anti-dew formation will activate: − Remote Control setting temperature is less than 25°C. − Compressor is on. − Cooling operation mode. − Indoor Fan motor operate at Low fan speed (CLo, Lo- or QLo). • This control is cancelled immediately when above conditio n is changed, or Powerful button is pressed. • Anti-Dew formation is control by: 1. CLo fan is changed to HLo fan. 2. QLo fan is changed to HLo fan. 25 CS-W7DKR CU-W7DKR / CS-W9DKR CU-W9DKR / CS-W12DKR CU- W12DKR
(For 8.5.8 to 8.5.16 information appliesonly toHeating Operation) 8.5.8. Restart Control (Time Delay Safety Control) • W hen the thermo-off temperature (temperature which compressor stops to operate) is reached during:- − 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. 8.5.9. Compressor Reverse Rotation Protection Control • If the compressor is operating continuously for 5 minutes or longer and thetemperature differen ce between indoor heat exchan ger and intake air is 5°C (heating mode) or less for continuous 2 minutes, compressor will stop and restart automatically. • Time Delay Safety Control is activated before the compressorrestart. T = Indoor heat exchanger temperature - Intake air temperature • This is to prevent compressor from rotate reversely when there is an instantaneous power failure. 8.5.10. 30 Minutes Time Save Control • The compressor will start automatically if it has stopped for 30 minutes and the intake air temperature falls between the compressor OFF temperature (A) and compressor ON temperature (B) 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. 26 CS-W7DKR CU-W7DKR / CS-W9DKR CU-W9DKR / CS-W12DKR CU- W12DKR
8.5.11. Overload Protection Control Outdoor Fan Control • If the temperature of the indoor heat exchan ger rises to 51°C, outdoor fan stops. The outdoor fan restarts when the indoor heat exchan ger temperature falls to 49°C. Compressor high pressure protection • If the indoor heat exchan ger becomes 65°C or more, the compressor will stop and restart automatically. (Time Delay Safety Control - 4minutes waiting). • This is to reduce the pressure, as to reduce the indoor heat exchan ger temp. Nevertheless, is to protect the compressor from overload of too high temperature. 8.5.12. 4-Way Valve Control • 4-way valve always on during Heating operation. (except deicing operation) • W hen 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. 8.5.13. Outdoor Fan Motor Control • W hen compressor stops (reaches room temperature), outdoor fan will operate for 30 seconds (forced operation). • This is to release the heat and to obtain the lowest pressure as fast as possible. 8.5.14. Hot Start Control • Hot Start Control is to prevent cool air discharge into the room when heating operation start. • W hen Heating operation starts, Indoor fan will not start until the indoor heat exchan ger reaches 30°C as diagram shown. • Hot start is completed when indoor heat exchan ger rises to 39°C or operation over 4 minutes. 27 CS-W7DKR CU-W7DKR / CS-W9DKR CU-W9DKR / CS-W12DKR CU- W12DKR
8.5.15. Anti ColdDraft 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 30 sec. from compressor OFF (Thermo OFF), Indoor fan speed will operate accordingly to the Indoor heat exchan ger temperature as shown below: • After 30 sec. from compressor OFF (thermo OFF), Indoor fan will run atSSLo speed only. • Anti Cold Draft Control will stop when: − Intake temperature < set temperature. (TimeDelay Safety Control 4minutes waiting is valid) − 30 Minutes Time Save Control activates. 8.5.16. Deicing Control Deice starts to prevent frosting at outdoor heat exchan ger. • Normal Deicing Deice operations detection commences after 30 minutes of Heating operation starts or 60 minutes after previous deice operation. If the TRS (Thermal Reed Switch) senses the outdoor piping temperature drops to -3°C (TRS CLOSE) or less for 50 sec. continuously during compressor is in operation, deice willstart. (There is no detection during Outdoor Fan stops.) • Overload Deicing During heating operation, if the outdoor Fan OFF duration (due to overload control) is accumulated up to 60 minutes and after compressor starts for 1 minutes, deicing starts. • Deicing ends when 1. 12 minutes after deicing operation starts; 2. TRS senses the outdoor piping temperature rises to 4°C (TRS OPEN). Deicing will not end immediately as time delay (Td) is valid as shown below. • Once deicing operation starts, it will not end for 60 seconds. • After deicing operation, compressor stops for 30 seconds and 4-way valve stays at cooling position for 10 seconds. 28 CS-W7DKR CU-W7DKR / CS-W9DKR CU-W9DKR / CS-W12DKR CU- W12DKR
Normal Deicing Time Diagram Overload Deicing Time Diagram 29 CS-W7DKR CU-W7DKR / CS-W9DKR CU-W9DKR / CS-W12DKR CU- W12DKR
8.6. Indoor Fan Speed Control • Indoor Fan Speed can be set using remote control. 8.6.1. Fan Speed Rotation Chart Fan Speed (rpm)CS-W7DKRCS-W9DKRCS-W12DKR SHi122013101310 Hi107011601280 Me9409801120 HLo840840960 CLo780780880 Lo-750750850 SLo700700750 SS Lo300300300 QSHi112012101210 QHi97010601180 QMe8408801020 QHLo770770890 QLo680680780 8.6.2. Automatic Fan Speed Control • W hen set to Auto Fan Speed, the fan speed is adjusted between maximum and minimum setting as shown in the table. − Fan speed rotates in the range of Hi, Me and Lo-. − Deodorizing Control will be activated. 30 CS-W7DKR CU-W7DKR / CS-W9DKR CU-W9DKR / CS-W12DKR CU- W12DKR