User manual LG LC240CP

[. . . ] website http://www. lgservice. com e-mail http://www. lgeservice. com/techsup. html LG LG Ceiling Cassette Air Conditioner SERVICE MANUAL CAUTION · BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. · ONLY FOR AUTHORIZED SERVICE PERSONNEL. TABLE OF CONTENTS Table of contents Page 1. Models List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3. [. . . ] · Measuring items are room temperature, outside temperature, suction temperature, blow out temperature, wind velocity, wind volume, voltage, current, presence of abnormal vibration and noise, operating pressure, piping temperature, compressive pressure. · As to the structure and appearance, check following items. Is the remote controller switch operated? Is the heat insulation complete Are not terminal screws loosened?M4. . . . . . 118N. cm{12kgf. cm} M5. . . . . . 196N. cm{20kgf. cm} M6. . . . . . 245N. cm{25kgf. cm} M8. . . . . . 588N. cm{60kgf. cm} Service Manual 29 Installation 2) Connection of power supply 1. Connect the power supply cord to the independent power supply. Operate the unit for fifteen minutes or more. 3) Evaluation of the performance 1. Measure the temperature of the intake and discharge air. Ensure the difference between the intake temperature and the discharge one is more than 8°C. Thermometer CAUTION After the confirmation of the above conditions, prepare the wiring as follows: 1) Never fail to have an individual power specialized for the air conditioner. As for the method of wiring, be guided by the circuit diagram pasted on the inside of control box cover. 2) Provide a circuit breaker switch between power source and the unit. 3) The screw which fasten the wiring in the casing of electrical fittings are liable to come loose from vibrations to which the unit is subjected during the course of transportation. Check them and make sure that they are all tightly fastened. (If they are loose, it could give rise to burn-out of the wires. ) 4) Specification of power source 5) Confirm that electrical capacity is sufficient. 6) Be sure that the starting voltage is maintained at more than 90 percent of the rated voltage marked on the name plate. 7) Confirm that the cable thickness is as specified in the power sources specification. (Particularly note the relation between cable length and thickness. ) 8) Never fail to equip a leakage breaker where it is wet or moist. 9) The following troubles would be caused by voltage drop-down. · Vibration of a magnetic switch, damage on the contact point there of, fuse breaking, disturbance to the normal function of a overload protection device. · Proper starting power is not given to the compressor. HAND OVER Teach the customer the operation and maintenance procedures, using the operation manual (air filter cleaning, temperature control, etc. ). 30 Ceiling Cassette Air Conditioner Installation 9. Optional Operation 1) Two Thermistor System (1) Open the rear cover of the wired remote-controller to set the mode. (2) Select one of three selectable modes as follows. [. . . ] Disconnect the charge hose from the vacuum pump. If the vacuum pump oil becomes dirty or depleted, replenish as needed. Mount the valve caps and the service port caps. Service Manual 51 (3-way) Valve (3) Gas Charging (After Evacuation) Indoor unit Liquid side 2-Way valve Open Outdoor unit Gas side Open Check valve 3-Way valve Charging cylinder Lo (1) OPEN CLOSE · Procedure 1. Connect the gauge to the charging cylinder. [. . . ]