Panasonic CS-ME10DTEG Service Manual

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Panasonic CS-ME10DTEG Service Manual Manual pdf 89 page image

The useful wiring error check function automatically correctswiring errors using a microcomputer.In cases where wires are embedded or the locations ofconnecting wires are not known for other reasons, for instance,pressing the wiring error check switch inside the right sidepanel of the outdoor unit enables operation as is even if thewires to room A are connected to room B by mistake. Wiringerror checks cannot be performed in the following situations:• For about 30 seconds (during the initial settings) after thepower was turned on.• During the 3-minute standby after the compressor hasstopped.• When the outside air temperature is below 5 °C.• When trouble has occurred in the indoor unit (includingtrouble in transmission to all rooms).This function need not be used if the correct piping andwiring are completely done.Operation method1. Remove the service panel (right side panel). (5 screws)2. Press the writing error check switch on the service monitorP.C. Board to start the writing error check operation.3. The writing error check is automatically completed in about10 to 15 minutes.4. When the faulty wiring check is completed, the servicemonitor LEDs blink.LED 1 2 3 4 JudgementDisplay All LEDs blink Blinking Automatic Correctioncannot be done.Blink in squence Off Automatic Correctionhave beenimplemented.Automatic correction have been implemented: LEDs 1, 2 and 3blink in sequence (LED4 is off).Automatic correction cannot be done: LEDs 1 to 4 blinksimultaneously to indicate:• A transmission problem in one of the indoor units.• A disconnected heat exchanger thermistor in an indoor unit• Trouble in an indoor unit (when the trouble has occurredduring the wiring error check)Trouble stopping: One of the LEDs 1 to 4 lights.Precautions1. About 10 to 15 minutes are required to conduct thecheck after the wiring error switch is pressed. (Onlywiring error between an unit A and unit B cannot becorrected.)2. If liquid pipes and gas pipe connected to different unit itcannot be corrected "automatically", be absolutely sureto run the liquid pipes and gas pipes in pairs.3. If the wiring error check switch is pressed again duringa wiring error check, the wiring error check can beforcibly terminated. In this case, what is stored in themicrocomputer will be the initial statuses (wiring room A→ piping A port, wiring room B → piping B port).4. The wiring error check function MUST be used whenthe outdoor unit P.C. Board is replaced.Basic knowledge• The principle operation of this function is as follows:The refrigerant flows in succession from the port A,and by detecting the temperature of the indoor unitheat exchanger sensor, the connected pipes andwires are collated.• The sound of ice forming (a crackling noise) may beheard from the indoor unit while this function isoperating: this is normal and not indicative of amalfunction. (This phenomenon occurs because theheat exchanger temperature is lowered to 0 °C orbelow in order to improve the detection accuracy.)• The indoor fan is also set to ON and OFF at thesame time.How to check the information currently stored in themicrocomputerThis information can be checked by observing the blinkingof the LEDs on the service monitor upon completion of thewiring error check, during forced operation or after stopped.LED1: Wiring room A, LED2: wiring room BThe first LED to blink denotes the piping port A and thesecond LED denotes the piping port B.The LED which has lighted first denotes the room whosewiring is connected to the piping port A, and the next LEDdenotes the port B. When the LEDs blink as shown belowThe LEDs in this figure denote that the piping port A hasbeen connected (automatically corrected) to the wiringroom B and that the piping port B has been connected(automatically corrected) to the wiring room A.8.7. Wiring Error Check Control89