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Section III. GENERAL MAINTENANCE INSTRUCTIONS
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TM-5-4120-361-14 Air Conditioner Vertical Compact 18 000 BTU/HR 208 Volts 3 Phase 50/60 Hz (Model 18K 208 3 60) Manual
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Compressor - TM-5-4120-361-14_88
TM 5-4120-361-14 cloths to protect the gas charge in ex- pansion valve bulbs and capillary tub- ing. 1. Brazing operations should be carried out using approved eye protection equipment and rods not containing cadmium. 2. Certain  brazing  operations may require mechanical ventilation. 3. Local preventive medicine personnel should be queried if doubt exists as to rod composition  or  ventilation requirements. c. Brazing. Braze copper-to-copper joints  with  silver solder type 3, 4 or 6A specification QQ-S-561 and copper-to- brass or copper-to-steel with type 4 or 6A specification QQ-S-561 per MIL-B- 7883. Solder melting point is 1160°F (625°C). All brazed or soldered joints shall be made with an atmosphere of in- ert gas to prevent internal oxidation. 5-8. Insulation and Gaskets. Replace dmaged insulation and gas- kets. Cement loose insulation. 5-9. Hardware. Replace any damaged screws, washers, lockwashers or nuts. use screws of cor- rect length to hold parts securely. In some applications screws that are too long may hit bottom before the head is tight against part it is to hold or may cause damage to the threads or other parts. 5-10. Shims. Be sure to remove all shims where used. Keep shims together and identify them as to location. 5-11. Repairing Damaged Threads. Damaged threads should be repaired by use of a thread restorer or by chasing in a lathe. Internal threads should be repaired with a tap of the correct size. If threads cannot be satisfactorily re- paired, replace the part. Drill out and replace blind rivet nuts having defec- tive  threads. 5-12. Repair of Damaged Machined and Polished Surfaces. Smooth rough spots, scores, burrs, galling, and gouges from damaged ma- chined and polished surfaces so that part will efficiently perform its normal function. The finish of the repaired part is to approximate that of the orig- inal finish. In perfoming any of these operations,  critical  dimensions  must  not be  altered. 5-13. Removal of Rust or Corrosion. Remove corrosion from all parts of ma- terial. To remove rust or corrosion, use wire brush, abrasive cloth, sand blast, vapor blast equipment, or rust remover except on highly polished sur- faces. On these surfaces, buffing or the use of crocus cloth is recommended. 5-14. Tubes and Fittings. Check tubes and fittings for cracked or split condition. Check tubing for kinks. Replace defective fittings. Re- place damaged tubing with tubing of same size. Take care in making bends in tub- ing to prevent kinking of tubing. All tubing and fittings must be completely clean on inside prior to installation. 5-15. Valves. Valves and other parts should be handled carefully to prevent damage. Capillary tubes must be handled very carefully to prevent kinking of the tubes. Section  IV. REMOVAL AND INSTALLATION OF MAJOR COMPONENTS AND ASSEMBLIES. 5-16. General. (See WARNING inside ect support and general support mainte- front  cover.) nance. The refrigerant piping and valves cannot be removed as a unit, and This section covers removal of all only those parts that require replace- major assemblies of the air conditioner ment should be removed. Removal and in- which are the responsibility of the dir- stallation  instructions  for  individual 5-7

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