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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
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    							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
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    							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
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    							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
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    							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
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    							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
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    							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
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    							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
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    							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
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    							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
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