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Panasonic Inverter Air Conditioner R410A Technical Data And Service Manual
Panasonic Inverter Air Conditioner R410A Technical Data And Service Manual
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2-1 Room Temperature Control .......................................................................................... 2-2 2-2 Cold Draft Prevention (Heating Cycle) ........................................................................ 2-4 2-3 Automatic Fan Speed (Indoor Unit) ............................................................................. 2-5 2-4 Control Functions ......................................................................................................... 2-6 2-5 Outdoor Unit Control PCB ........................................................................................... 2-9 2-6 Outdoor Unit Control PCB (CR-CH4272R) ................................................................2-10 2. PROCESSES AND FUNCTIONS 2-1 2 4.@1$J@64MFUUFSJOEC4.@1$J@64MFUUFSJOEC
2-2 2. Processes and functions Fig. 1 (THERMO. OFF) (THERMO. ON)ROOM TEMP. THERMO. ON 5 MINUTES MORE THAN 5 MINUTES 3 MINUTES SET TEMP COMPRESSOR OUTDOOR FAN (H OR M) INDOOR FANF F O F F O F F O F F O 1 1. Refer to 2-4 Outdoor Fan Speed ControlMORE THAN 3 MINUTES MORE THAN 5 MINUTES N O N O N O N O N O N O SET SPEED T+2°F T–2°F . T °F BODY SENSOR 1133_THS_I THERMO. OFF Chart Summary and Explanations Once the compressor starts, it keeps running for 5 minutes. Once the compressor stops, it will not start running again for 3 minutes. If you change the operation mode (HEAT, COOL or FAN) during the heating cycle, the control circuit stops the compressor for 3 minutes. For 5 minutes after the compressor is first turned on, and for 3 minutes after it is turned off, the compressor is not controlled by the room sensor. Thermo ON:When room temperature rises 2 F (4F when set on body sensor) above the set temperature T, (T+2F or T+4F when set on body sensor): CompressorON Thermo OFF: When the room temperature is –2F below the set temperature T: CompressorOFF 2-1 Room Temperature Control The unit adjusts room temperature by turning the outdoor unit’s compressor ON and OFF. This process is controlled by the thermostat located in the remote control unit. The figures on this and the next pages show how each part of the system performs when the room temperature changes and the thermostat activates the compressor to start (thermo ON) or stop(thermo OFF). Fig. 1 shows about the cooling cycle, and Fig. 2 shows about the heating cycle. (A) Cooling 2 4.@1$J@64MFUUFSJOEC4.@1$J@64MFUUFSJOEC
2-3 2. Processes and functions Fig. 2 THERMO. ON THERMO. ON +2°F F F O F F O 2 1. Refer to 2-4 Outdoor Fan Speed Control OFF SET SPEED N O N O N O ON (REVERSING CYCLE) ON TEMP. OPERATION REMOTE CONTROL SENSOR (Only for wireless remote controller) BODY SENSOR OFFOFF SET SPEED SET SPEED 3 SECONDSON OFF ONMORE THAN 3 MINUTES OFF ON OFFON OFF ON OFF OFF ON3 MINUTESMORE THAN 5 MINUTES 5 MINUTESTHERMO. ON THERMO. ON THERMO. ON THERMO. ON 2. Refer to 2-2 Cold Draft Prevention (Heating) BUTTONCOIL (4-WAY) SOLENOID E2 TEMP. COIL EXCH. INDOOR HEAT STANDBY2 INDOOR FAN1 OUTDOOR FAN (H OR M)COMPRESSORSET. +2°F SET. –2°F –2°F SET TEMP.+7°F SHIFTTHERMO. OFF THERMO. OFF OFF (88°F) 81°F 77°F 1134_THS_I THERMO. OFF THERMO. OFF LL LL LL LL SETTING TEMP. SET TEMP. Chart Summary and Explanations Once the compressor starts, it keeps running for 5 minutes. Once the compressor stops, it will not start running again for 3 minutes. If you change the operation mode (HEAT,COOL or FA N) during the heating cycle, the control circuit stops the compressor for 3 minutes. For 5 minutes after the compressor is first turned on, and for 3 minutes after it is turned off, the compressor is not controlled by the room sensor. When set on remote control sensor Thermo ON: When room temperature is –2F below the set temperature T. Compressor ON Thermo OFF: When the room temperature is 2F above the set temperature T, (T+2 F) Compressor OFF When set on body sensor NOTE: In case of Body sensor, operating temperature is shifted to setting temperature +7F. (B) Heating 2 4.@1$J@64MFUUFSJOEC4.@1$J@64MFUUFSJOEC
2-4 2. Processes and functions Fig. 3 92 88 81 77 50 SET FA N SPEEDAUTO OR H M L LL LL/OFF LL L L LLL LL/OFF LL L M M LL LL/OFF LL L M HMAX. 6 MINUTES “STANDBY” INDICATOR INDOOR UNIT COIL TEMP. E2 (°F) LL= Very low speed L= Low speedM= Medium speed H= High speed “STANDBY” APPEARS 1135_THS_I Chart Summary and Explanations The main idea of this chart is to show that the indoor fan speed increases and gets closer to the set fan speed as the coil temperature E2 rises. The indoor unit fs coil temperature is taken from sensor E2 located in the middle of the indoor heat exchange coil. The dotted line shows that the indoor fan motor is OFF. When the temperature at sensor E2 falls below 50F, the indoor fan motor stops running. 2-2 Cold Draft Prevention (Heating Cycle) The cold draft prevention function controls indoor fan speed so a strong draft of cold air will not blow out before the indoor heat exchange coils have warmed up. STANDBY shows on the remote controller when the indoor fan speed is LL (very low) or OFF. This condition occurs in the following 3 cases: During Thermo OFF (refer to 2-1 B. Room Temperature Control, Heating) During the defrosting operation (refer to 2-10 Defrosting Control, Heating) Until either the coil temperature E2 reaches 81°F or when a maximum of 6 minutes has past. The indoor fan motor operates in L instead of LL for 3 seconds as it starts to give the fan an initial boost. 2 4.@1$J@64MFUUFSJOEC4.@1$J@64MFUUFSJOEC
2-5 2. Processes and functions Fig. 4 INDOOR FAN SPEED L H MMH 1923_M_S ROOM TEMP. (deg) SET TEMP.+3 +2 +1 H M: High : MiddleL: Low Chart Explanations and notes When the fan speed changes, it keeps the speed step for at least 3 minutes, even if the temperature changes to another speed step during the time. Fig. 5 INDOOR FAN SPEED H L MMH 1924_M_S ROOM TEMP. (deg) SET TEMP. –2 –4 H M: High : MiddleL : Low Chart Explanations and notes When the fan speed changes, it keeps the speed step for at least 1 minute, even if the temperature changes to another speed step during the time. 2-3 Automatic Fan Speed (Indoor Unit) By pressing the FAN SPEED button on the remote controller, the fan speed can be set at one of four steps: AUTO., HI., MED., or LO. When set at AUTO. the indoor unit fan speed will be automatically adjusted to the room temperature as the two charts shown below. (A) Cooling (B) Heating 2 4.@1$J@64MFUUFSJOEC4.@1$J@64MFUUFSJOEC
2-6 2. Processes and functions 124 142 2-4 Control Functions Electronic control valve control Opening of the electronic control valve is controlled so that the appropriate operating conditions are maintained, based on the signal from each sensor (discharge temperature [TD], intake temperature [TS], outdoor heat exchanger temperature [C1], and indoor heat exchanger temperature [E1, E2]). Discharge temperature release control (1) This control lowers the operating frequency of the compressor when electronic control valve control is unable to maintain the appropriate operating conditions because the discharge temperature fails to decline or because there is a sudden increase in the discharge temperature. (2) If the discharge temperature exceeds 232°F, the compressor is stopped and then restarted. (Error count = 1) (3) The error count is cleared when operation has continued for 10 minutes after the compressor was restarted. (4) If (2) repeats 4 times without the error count being cleared (error count = 4), alarm P03 occurs. Current release control The compressor operating frequency is controlled so that the current that is input to the inverter compressor does not exceed the designated value (control value). Outdoor unit fan control 1. Cooling fan control (1) The outdoor unit fan minimum speed and maximum speed are determined according to the outdoor air temperature and the operating frequency. The speed is controlled in stages between the minimum speed and maximum speed, based on the outdoor heat exchanger temperature (C2) at that time. (2) For 60 seconds after start, the outdoor unit fan operates at maximum speed, as determined by the outdoor air temperature and operating frequency at that time. Subsequently, the fan operates at low speed until the outdoor heat exchanger temperature (C2) rises. (3) If the discharge temperature (TD) sensor is abnormal or has become disconnected, the fan will not operate and a protective device is activated. 2. Heating fan control (1) The outdoor unit fan minimum speed and maximum speed are determined according to the outdoor air temperature and operating frequency. The speed is controlled in stages between the minimum speed and maximum speed, based on the outdoor heat exchanger temperature (C1) at that time.(2) If the outdoor heat exchanger temperature (C1) is 75°F or higher continuously for 5 minutes, fan operation may stop (same conditions as when the thermostat is OFF). In this case, the fan will restart after 3 minutes. (3) This control is not performed during the 3 minutes after start, for 1 minute after defrost ends, and while defrost is in progress. Coil heating control (1) This control applies current to the coil of the stopped compressor to heat the compressor in place of the crank case heater. (2) When the discharge temperature (TD) is less than 77°F, the current application judgment is made based on the outdoor air temperature (TO). Current application starts when the outdoor air temperature drops to 59°F or below. Current application stops when the outdoor air temperature rises above 64°F. Control for prevention of short intermittent operation In order to protect the compressor, this control does not allow the compressor to be stopped for 10 minutes after operation starts, even if the thermostat OFF signal is received from the indoor unit. Control for prevention of high cooling loads This control reduces abnormal high-pressure increases during cooling operation. (1) If MAX (C1, C2) (C1 & C2: outdoor heat exchanger temperature) is less than 124°F, the compressor performs normal operation. (2) If MAX (C1, C2) is 124°F or higher and less than 142°F, the revolution of the compressor is controlled to prevent the high pressure being increased. (3) If MAX (C1, C2) is 142°F or higher, the compressor stops once. The compressor restarts three times, and if the temperature dose not decrease to less than 142°F, the alert P20 is displayed. 2 4.@1$J@64MFUUFSJOEC4.@1$J@64MFUUFSJOEC
2-7 2. Processes and functions 36 (36, 48 types) Overcurrent protection control (1) If the overcurrent protection circuit detects abnormal current, the compressor is stopped. (Error count = 1.) The compressor then restarts after 3 minutes. (2) If compressor start/stop is repeated 4 times (error count = 4), alarm P26, P29 or H01 (count = 2 in this case only) occurs. Operation stops and does not restart. Current release value shift control (1) This control is intended to improve compressor reliability by preventing continuous high-frequency operation under overload conditions when the outdoor air temperature is high, and by preventing intermittent operation through control for prevention of high cooling loads. (2) The control value for current release control is corrected according to the outdoor air temperature (TO). Depending on the temperature, the control value is lowered to 50 – 90% for cooling operation, and to 60 – 98% for heating operation. Freeze prevention (low-temperature release) control The below control is performed during cooling operation (including dehumidifying operation), using whichever of the indoor heat exchanger temperatures (E1 or E2) is lower. (See the figure below.) (1) If a temperature in the J area (operating frequency reduction and thermostat OFF area) is detected for 6 minutes, the compressor operating frequency is reduced. The compressor operating frequency is reduced every 30 seconds as long as the temperature remains within this area. (2) If the temperature is in the K area (operating frequency increase-prohibit area), the compressor operating frequency is maintained. (3) If the temperature is in the H area (operating frequency control area), and the outdoor air temperature is less than 90°F, the compressor maximum operating frequency is limited according to the indoor unit fan speed. (4) If the temperature is in the I area (normal operating area), the compressors operate normally. (5) If the temperature is continuously in the J area and the compressor operating frequency reaches 0, then temperature A (temperature for changing from J area to H area) is raised from 41°F to 46°F, and operation continues with the thermostat OFF until the temperature reaches the H area. Heating high-load control The below control is performed during heating operation, based on the indoor heat exchanger temperature MAX (E1,E2). (1) If the temperature is in the M area (operating frequency reduction and thermostat OFF area), the compressor operating frequency is reduced. The compressor operating frequency is reduced every 30 seconds as long as the temperature remains within this area. (2) If the temperature is continuously in the M area, the thermostat turns OFF. (3) If the temperature is in the N area, operating frequency increases are prohibited. (4) If the temperature is in the L area, the operating frequency is raised to the original frequency (the frequency prior to frequency reduction) by 6 Hz every 60 seconds. * When the compressor turns ON and the E2 temperature rises, the temperature at which the M area is first entered is 124°F (36, 42 types) or higher than 129°F (26 type). If the E1, E2 temperature subsequently falls to the L area, the temperature for entering the M area is raised to 126°F (36, 42 types) or 133°F (26 type). However if the E1, E2 temperature falls to the L area and falls below 86°F, then the temperature for entering the M area is changed back to 124°F (36, 42 types) or 129°F (26 type). 2 4.@1$J@64MFUUFSJOEC4.@1$J@64MFUUFSJOEC
2-8 2. Processes and functions 1 2 3Defrost control Defrost sequence Heating operation (25-minute mask) Frost detection Defrost start (reverse cycle defrost) Defrost in progress Defrost cancel Start-up operationOperating frequency: 61.8 Hz Outdoor unit fan: OFF Electronic control valve: step 300 4-way valve: OFF Indoor unit fan: OFF Defrost control (1) Frost detection 1. Outdoor heat exchanger temperature (C1) method (15-minute mask after operation start) 2. Outdoor air temperature is 7°F or above and outdoor heat exchanger temperature (C1) of 0°F or below is detected continuously for 20 seconds. 3. Outdoor air temperature is below 7°F and outdoor heat exchanger temperature (C1) of below (outdoor air temperature -10)°F is detected continuously for 20 seconds. (2) Defrost cancel Defrost end conditions 1. Outdoor heat exchanger temperature (C1) rises to 54°F or higher. 2. Outdoor heat exchanger temperature is 45°F or higher continuously for 1 minute. 3. Defrost time of 10 minutes has elapsed. (3) Startup operation After defrost ends, the compressors and outdoor unit fan stop for approximately 40 seconds, then operation begins in heating mode. 2 4.@1$J@64MFUUFSJOEC4.@1$J@64MFUUFSJOEC
2-9 2. Processes and functions Fan motor plug (CN004)EEPROM IC MDC Heat exchanger temperature (C2) sensorHeat exchanger temperature (C1) sensorSuction temperature (TS) sensor Outdoor air temperature (TO) sensor Compressor discharge temperature (TD) sensor Refrigerant recovery switch (S005) Quiet mode plug (CN028) EXCT plug (CN026) Automatic address setting switch (S001) Snowfall sensor Cooling test Test pin (CN036) Operation circuit fuse (F002) LED 1, 2 Serial 1 plug Terminal plug (CN015) Serial 2 plug If the operation circuit fuse (F002) has blown, determine and correct the cause for the blown fuse, then change the socket from the serial 1 plug to the serial 2 plug. Position detection plug (CN003) Refrigerant System address switch (S002) Refrigerant System address switch (S003) Power LED (D115) 2-5 Outdoor Unit Control PCB (1) Layout Diagram (CR-CH4872R) 2 4.@1$J@64MFUUFSJOEC4.@1$J@64MFUUFSJOEC
2-10 2. Processes and functions Push-button switch (black): Automatic address setting switch If the system address switch (S002: set to 0 at time of shipment) setting is other than 0 (central control), press this switch once to automatically set the addresses at all indoor units which are in the same system, and are connected to that outdoor unit. During automatic address setting, the 2 LEDs (red) on the outdoor unit control PCB blink alternately. (Pressing this switch again stops automatic address setting.) If automatic address setting is currently in progress at another system that is subject to central control, only LED 1 on the outdoor unit control PCB blinks to indicate that automatic address setting is in progress at another unit. If automatic address setting is in progress at another unit, automatic address setting cannot be started at this unit, even if S001 is pressed. Rotary switch (10 positions, black): System address setting switch This switch is set to 0 (1 system control) at the time of shipment. However the address for each system must be set when multiple systems are controlled or when central control is used. (Figure 1) If the system address is set to 0, automatic address setting is started when the power is turned ON. Therefore it is not necessary to use switch SW01 and perform automatic address setting in the case of single or simultaneous-operation multi control of a single system. When using central control for multiple systems, a maximum of 30 systems (maximum 64 units) can be connected. In the case of group control or central control, set the sys- tem address to a setting other than 0 (1 or above). If the number of systems is greater than 9, this switch can be used in combination with DIP switch S003 to set up to 30 systems. The setting can be made as high as 39, however all settings above 30 are handled as 30 for control. (For details, refer to Table 1.) If system addresses are duplicated (the same address exists more than once), LED 1 on the outdoor unit control PCB lights up, and alarm L04 is displayed on the remote con- troller. DIP switch (2P, blue): System address 10s-digit and 20s-digit place setting switch When setting 10 systems or more, set this switch in combination with S002. For 10 – 19 systems, set 1P (10s-digit place) to ON. For 20 – 29 systems, set 2P (20s-digit place) to ON, and set 1P (10s-digit place) to OFF. For 30 systems, set both 1P (10s-digit place) and 2P (20s-digit place) to ON. (For details, refer to Table 1.) Refrigerant recovery switch (red button switch) Press this switch to perform refrigerant recovery control using cooling operation. The indoor unit fan will operate at HIGH and 55 Hz for a maximum of 10 minutes. When refrigerant recovery is completed, close the valves and press this switch to stop the operation. 2P plug (red): Pin used for PCB inspection at the factory 3P plug (red): Can be used for demand control The operating ranges are shown in the table. Test (CN036) EXCT (CN026)S001 S002 S003 S005 2P and 3P 1P and 3POperating range 0 0 1 10 1 0 1normal (at shipment from factory) rated capacity 70% 0%Short-circuited 2-6 Outdoor Unit Control PCB (CR-CH4272R) (1) Explanation of Functions 2 4.@1$J@64MFUUFSJOEC4.@1$J@64MFUUFSJOEC