CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 1 Service Information Notice of Address setting for NEW Cassette / NEW Outdoor Unit. The new Cassette / New Outdoor models are possible to have address setting for twin / triple control or group control by automatic when main power supply is switched on.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 1.4. Operation range 1.4.1. Power Supply The applicable voltage range for each unit is given in the following table. The working voltage among the three phases must be balanced within a 3% deviation from each voltage at the compressor terminals. The starting voltage must be higher than 85% of the rated voltage.
• • • • Dry mode can make a comfortable indoor environment during wet season. 2.1.5. Quiet operation • • • • The sound level is as low as 32 dB (A) for model CS-F24DB4E5, 33 dB (A) for model CS-F28DB4E5 and suitable for offices, shops, homes etc., where quiet operation is essential. 2.1.6.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 2.1.8. Piping and drainage • • • • Built-in upward draining mechanism. 2.1.9. Automatic changeover function (heat pump models) • • • • The unit automatically switches between cooling and heating in accordance with operating load in order to maintain a comfortable indoor temperature.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 2.2. Low-noise outdoor units [Product features] 2.2.1. Low-noise design improves in surrounding areas 1. The noise-suppressing winglet fan is a result of new research into vane design theory. The unique curved shape suppresses the generation of vortexes, thus reduces air flow noise.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 2.3. Improved workability 2.3.1. Pipes that are one size larger can also be connected for renewal • • • • If renewing the system, existing refrigerant pipes can be utilized so that only the indoor units need to be replaced.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 2.3.8. Centralized draining method • • • • Even when multiple outdoor units are installed to a wall, the drain outlets can be concentrated into a single drain pipe. This makes installation easier also improve appearance.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 2.5. Wired Remote Control 1. The new design includes an easily-visible red pilot lamp. The power can be turned on and off at a single touch, without opening the cover. 2. Has a build-in thermistor, allowing indoor temperature detection in accordance with indoor conditions by switching with main unit thermistor.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 2.7. Group Control Equipment Group control by one remote [Remote side] • • • • Optional wired remote control • • • • All air conditioner units are control CZ-RD513C controlled as a whole by remote control.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 3 Specification 3.1. Product Specification 3.1.1. CS-F24DB4E5 CU-L24DBE5 ITEM / MODEL Indoor Unit Outdoor Unit Main Body CS-F24DB4E5 CU-L24DBE5 Panel CZ-BT03P Remote CZ-RD513C (Wired) Control CZ-RL513B (Wireless) Cooling Capacity BTU/h 21,500 Heating Capacity BTU/h 24,200...
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 3.1.2. CS-F28DB4E5 CU-L28DBE5 ITEM / MODEL Indoor Unit Outdoor Unit Main Body CS-F28DB4E5 CU-L28DBE5 Panel CZ-BT03P Remote CZ-RD513C (Wired) Control CZ-RL513B (Wireless) Cooling Capacity BTU/h 24,200 Heating Capacity BTU/h 27,300 Refrigerant Charge-less Standard Air Volume for High,...
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 8 Operation Details 8.1. Wired Remote Control (Optional part) Name and function of each part OFF/ON button Used to start and stop the operation. FAN SPEED button Used to select the fan speed of high (HI), medium (MED), low (LO) or auto (AUTO).
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 8.2. Wireless Remote Control (Optional part) Name and function of each part OFF/ON button Used to start and stop the operation. ODOUR WASH button FILTER RESET button Press to cancel the “FILTER” indicator light on the control panel.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 9 Operation Control Description of basic control functions 9.1. Operation Mode 1. Thermostat control 2. Depend on differences between room temperature and setting temperature, Compressor running frequency will be decided and start operation. Temperature differences become same as below table, then thermostat is off.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 − − − − Unit using DC motor As follow the below figure, fan speed changing operation (program air). (rpm center B and is different if capacity rank is different) − − − − Unit using AC motor When 1st thermostat on condition from operation start, fan speed is hi (same as manual fan speed), after 2nd thermostat on condition, fan speed change to medium speed (same as manual medium fan speed).
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 9.3.4. Freezing prevention control • • • • During cool or dry mode operation, if indoor evaporator temperature is going down, freezing prevention control is operated. • • • • Detail of Freezing prevention control is as follows;...
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 9.3.6. Drain pump control • • • • During cooling, dry, or defrost operation, drain pump operate by following the below table. • • • • When compressor start, drain pump operation start after 10 second of indoor fan starting.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 Fan speed auto • • • • When operation start, or during operation, fan speed control by detecting indoor heat exchanger as follows: • • • • (K10 = Indoor heat exchanger temperature, depend on indoor type) 9.4.2.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 9.4.6. Heating high temperature protection • • • • During heating operation, when outdoor temperature is more than 35°C for 15 minute, compressor stop to protect compressor. • • • • After 3 minute (re-start delat control) waiting, if thermostat on condition, outdoor unit re-start.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 9.5. Louver Control 9.5.1. Louver control for cassette type • • • • When power is on, at the same time, louver start initializing toward to close Direction. • • • • During operation, stopping, thermostat off condition, louver angle set manual or auto depend on remote controller setting.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 9.5.2. Ceiling type louver control • • • • When power is on, at the same time, louver initialize 2 times. • • • • During operation, stopping, thermostat is off condition, louver angle change as below table by manual setting or auto setting of remote controller.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 9.6. Odour Removing Operation • • • • During stop condition, or cooling operation, when pushing the [ODOUR] button for 5 second, operation change to the odour removing operation. • • • • Operation detail is as follows;...
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 9.7. Energy Save Operation • • • • During cooling operation, or heating operation, when pushing the [ECONOMY] button in the wired remote controller, energy save operation start and [ECO] sign is displayed at LCD display panel of wired remote controller ([ECONOMY] sign is displayed at LCD display panel of wireless remote controller).
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 9.11. Pump Down Operation • • • • When pushing the [PUMP DOWN] button on the outdoor PCB for 1 second, pump down operation start. Detail of pump down operation is shown at below table.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 10 Installation Instruction 10.1. Pipe length • • • • CORRECTION OF COOLING CAPACITY AND HEATING CAPACITIES 1. Correction of cooling and heating capacities according to the connecting pipe length. The Data of cooling capacities (marked on the name plate) are based on 5 meters connecting pipe and horizontal installation.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 10.2. Refrigerant additional charge 1. Piping installation by standard piping • • • • At the time of shipment from the factory, this unit is charged with enough refrigerant for an equivalent pipe length of 30 m.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 10.4. Indoor unit installation FOUR WAY CASSETTE TYPE AIR CONDITIONERS INSTALLATION INSTRUCTIONS Precautions in terms of safety Carry out installation work with reliability after through reading of this “Precautions in terms of safety”. • • • • Precautions shown here are differentiated between Warnings Cautions .
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 Cautions Carry out Earthing work. Drain piping should be made to ensure secure drainage Do not connect the Earth return to the gas pipe, according to the manual for installation work and carry out the water line pipe, lightning rod and telephone lines.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 1. In such places as restaurants and kitchens, considerable amount of oil steam and flour adhere to the turbo fan, the fin of the heat exchanger and the drain pump, resulting in heat exchange reduction, spraying, dispersing of water drops, drain pump malfunction, etc.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 POSITIONS OF AIR CONDITIONER BODY AND CEILING SURFACE Warning Tighten the nuts and bolt to prevent unit from falling. HANGING POSITION OF THE AIR CONDITIONER BODY 10.4.4. Refrigerant piping Refrigerant is charged to the outdoor unit. For details, see the manual for installation work of outdoor unit.(Additional charging, etc.)
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 • • • • Confirm the red mark of the union (thin side) is always at lower direction after connecting piping. Vacuum drying After completing the piping connection, execute vacuum drying for the connecting piping and the indoor unit.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 • • • • When the test is completed, connect the flexible drain hose to the drain port. 10.4.6. Heat insulation Caution Be sure to perform heat insulation on the drain, liquid and gas piping. Imperfection in heat insulation work leads to water leakage.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 10.4.7. Electrical wiring As to the main power source and cable size of outdoor unit, read the installation manual attached to the outdoor unit. The units must be installed in accordance with applicable national and local regulations.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 Earth lead wire shall be longer than other lead wires as shown in the figure for the electrical safety in case of the slipping out of the cord from anchorage. 10.4.8. Settings Do not operate the remote controller within 1 minute after turning on the power of the indoor unit.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 10.4.9. Installation of decorative panel The decorative panel has its installation direction. Confirm the direction by displaying of the piping side. Before installing the decorative panel, always remove the paper template. 1. Remove the air inlet grill from the decorative panel.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 4. Adjust between decorative panel fixing hole and indoor unit screw hole. 5. Fix decorative panel with 4 screws with already fix at paper model for installation. Caution Install certainly the decorative panel. Cool air leakage causes sweating. → Water drops fall.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 7. Open the indoor control box cover. (2 pcs) 8. Insert firmly the connector of cosmetic louver to indoor pcb CN-STM1 and CN-STM2. Be caution not to clamp the cord in between control board and control board cover.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 • • • • First, press the OFF/ON ( ) button. • • • • Then press the TEST RUN button within 1 minute of pressing the OFF/ON ( ) button. • • • • Next, select the operation modes.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 10.5. Outdoor unit installation AIR CONDITIONERS OUTDOOR UNIT INSTALLATION INSTRUCTIONS Precautions in terms of safety Carry out installation work with reliability after thorough reading of this “Precautions in terms of safety”. • • • • Precautions shown here are differentiated between Warnings Cautions .
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 Warnings Wiring shall be connected securely using specified cables and fix them securely so that external force of the cables may not transfer to the terminal connection section. Imperfect connection and fixing leads to fire, etc.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 b. Prevention measure for refrigerant piping Prevention measure for refrigerant piping is very important work to prevent water-dust-rubbish from getting in. All piping terminals needs sealing such as shown below. Place Period of work Method of seal...
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 For the use of a gas cylinder without siphon inside, turn it upside down and use it. (We recommend manifold with sight glass.) Caution Do not use a “CHARGE CYLINDER”. Caution As a rule, please collect all existing refrigerants in the system outside the system when the refrigerant leakage occurs by the system.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 12. Be sure to leave enough space around the outdoor unit to maintain proper performance and to allow access for routine maintenance. • • • • Allow enough space from any obstacles as shown in Fig. 1.2 below in order to prevent short-circuits from occurring.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 • • • • If a drain pipe needs to be installed, insert the accessory drain elbow into the mounting hole at the bottom of the outdoor unit, and connect a hose with an inside diameter of 15mm to this drain elbow.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 3. Notes when connecting the refrigerant pipes. • • • • Use clean copper, pipes with no water or dust on the insides. • • • • Use phosphorus-free, unjointed copper pipes for the refrigerant pipes.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 • • • • Pump down operation − − − − Operate the pump down according to the following procedures. Procedure Notes 1. Confirm the valve on the liquid side and the gas side is surely open.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 Earth lead wire shall be longer than other lead wires as shown in the figure for the electrical safety in case of the slipping out of the cord from the anchorage. • • • • Power supply specifications...
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 10.5.10. Connecting power supply cables CAUTION • • • • For three phase model, never operate the unit by pressing the electromagnetic switch. • • • • Never correct the phase by switching over any of the wires inside the unit.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 NOTE If the self-diagnosis function reports a problem but more than one problem has developed at the indoor and/or outdoor units, the problem display on the remote control unit may not match the LED display on the outdoor unit printed circuit board. In such cases, check both locations and remove the causes of the problems.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 10.6. Wired remote control installation Wired Remote Control Installation Manual • • • • Before installing the wired remote controller, be sure to thoroughly read the “Notes with regard to safety” section of the installation manual provided with the indoor unit.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 If no displays appear on the remote controller, check while referring to “If no remote controller displays appear” in “5 Test operation”. • • • • The remote control cable is live during use, so please be careful with it.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 • • • • Strip the end of the remote control cable which is to be connected to the remote controller. (Refer to the illustration below) • • • • Route the remote control cable inside the lower case in accordance with the intended feeding- out direction. (Refer to the illustration below.)
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 If remote control cable is embedded If installing with the remote control cable exposed 1. Embed an outlet box (JIS C 8336) into the wall, and then secure 1. Secure the remote controller base plate to the wall with two the remote controller base plate to the outlet box with the two accessory 4 mm screws.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 Automatic address resetting for group control • • • • The address settings for group control (air conditioner Nos. 1 to 16) can be reset automatically. 1. When operation is stopped, press for 5 seconds, continue the TEST RUN switch to display “00” (will be LOCAL MODE).
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 10.6.5. Test operation • • • • Turn on the main power. • • • • After 3 minutes have passed since the power was turned on, press the OFF/ON switch on the remote controller. (No operation occurs within 3 minutes after the power was turned on.)
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 • • • • You can then switch between the display for the previous problem and the problem before that by pressing the UP (TIMER) DOWN (TIMER) switches. • • • • Press the CHECK switch once more to return to the normal display.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 10.7. Wireless remote control installation manual Wireless Remote Control Installation Manual • • • • Before installing the wireless remote controller, be sure to thoroughly read the “Notes with regard to safety” section of the installation manual provided with the indoor unit.
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Attach the receptor unit onto the decorative panel of the indoor unit as shown in the figure below. 1. Remove the “corner cover” at the decorative panel indicate “Panasonic” logo left side. 2. Attach the receptor unit which same position.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 1. Route the joint cord for wiring as shown in the figure (figure of the back of decorative panel) below. Pass the cord through the hook of the decorative panel, taking care that the cord does not run on the heat insulator, etc.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 Receptor unit (for ceiling type) assembly procedure Attach the receptor unit onto the indoor main unit as shown in the figure below. Remove the air-intake grille and the side cover. To remove the side cover, remove the fixing screw each on the left and the right and pull the side cover towards you.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 10.7.4. Address setting for wireless remote controller and receptor unit (only when using more than one indoor unit) • • • • Only the air conditioner units which receptor unit address numbers match the remote controller address number can be operated.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 NOTE • • • • If the batteries are replaced or the remote controller is reset, the address setting will return to ADDRESS1, so you will need to repeat the address setting again. All setting details which are stored in memory will be cleared, so you will need to repeat the setting.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 [Manual setting] 10.7.5. Emergency operation • • • • If you do not have the wireless remote controller (because the batteries are weak, or some other reason prevents the wireless remote controller from being used), emergency operation can be carried out at receptor unit.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 10.8. Twin and triple 10.8.1. Twin and Triple Operation • • • • Simultaneous air conditioning of wide spaces and corners is possible. Indoor units with horsepowers can even be used in combination. • • • • Master unit and slave-units can be set automatically in twin and triple systems. No address setting is necessary.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 11 Installation and Servicing Air Conditioner Using R410A 11.1. Outline 11.1.1. About R410A refrigerant 1. Converting air conditioners to R410A Since it was declared in1974 that chlorofluorocarbons (CFC), hydro chlorofluorocarbons (HCFC) and other substances pose a destructive danger to the ozone layer in the earth’s upper stratosphere (20 to 40 km above the earth), measures have been...
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 d. R410A refrigerating machine oil Conventionally, mineral oil or a synthetic oil such as alkylbenzene has been used for R22 refrigerating machine oil. Because of the poor compatibility between R410A and conventional oils like mineral oil, however, there is a tendency for the refrigerating machine oil to collect in the refrigerating cycle.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 11.2.2. R410A tools 1. Copper tube gauge for clearance adjustment (used when flaring with the conventional flaring tool (clutch type)) • • • • This gauge makes it easy to set the clearance for the copper tube to 1.0-1.5 mm from the clamp bar of the...
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 5. Charging hose • • • • The pressure resistance of the charging hose has been raised to match the higher pressure of R410A. The hose material has also been changed to suit HFC use, and the size of the fitting has been changed to match the manifold ports.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 8. Electronic scale for refrigerant charging • • • • Because of the high pressure and fast vaporizing speed of R410A, the refrigerant cannot be held in a liquid phase inside the charging cylinder when charging is...
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 11.3. Refrigerant piping work 11.3.1. Piping materials It is recommended that you use copper and copper alloy jointless pipes with a maximum oil adherence of 40 mg/10m. Do not use pipes that are crushed, deformed, or discolored (especially the inside surface). If these inferior pipes are used, impurities may clog the expansion valves or capillaries.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 b. Copper pipes Use only copper pipes with the thickness given in table 10, and with minimal impurities. Because the surface of the pipe is exposed, you should take special care, and also take measures such as marking the pipes to make sure they are easily distinguished from other piping materials, to prevent mistaken use.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 11.4.2. Transferring (Using new refrigerant piping) 1. Removing the unit a. Collecting the refrigerant into the outdoor unit by pumping down The refrigerant can be collected into the outdoor unit (pumping down) by pressing the TEST RUN button, even when the temperature of the room is low.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 3. Fully open the handle Lo of the manifold gauge, turn on the power of the vacuum pump and continue the vacuum process for at least one hour. 4. Confirm that the low pressure gauge shows a reading of -0.1 Mpa (-76 cmHg), then fully close the handle Lo, and turn off the vacuum pump.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 11.4.6. Brazing As brazing requires sophisticated techniques and experiences, it must be performed by a qualified person. In order to prevent the oxide film from occurring in the pipe interior during brazing, it is effective to proceed with brazing while letting dry nitrogen gas (N ) flow.
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 12 Troubleshooting Guide 12.1. Self-diagnosis error code table • • • • The display screen on the wired remote control unit and the self-diagnosis LEDs (green) on the outdoor unit printed circuit board in the outdoor unit can be used to indicate where the location of a problem is.
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5 Wired remote Outdoor unit printed circuit board LED Location or problem Check location control unit display Abnormal Detail 302 303 304 305 306 307 308 309 dispaly dispaly Outlet temperature sensor Outlet temperature sensor lead wire,...