THIS HONEYWELL PAMPHLET DISCUSSES SOME ASPECTS OF PREVENTIVE MAINTENANCE OF AUTOMATIC CONTROLS, HEATING, VENTILATING, AND AIR CONDITIONING, AND COMPARES IN-PLANT WITH CONTRACT SERVICE, CONCLUDING THAT CONTRACT SERVICE IS PREFERABLE AND DESCRIBING A NUMBER OF MAINTENANCE PLANS WHICH THEY FURNISH. PREVENTIVE MAINTENANCE PROVIDES--(1) MORE EFFICIENT OPERATION, (2) FEWER BREAKDOWNS, (3) ANNUAL BUDGETING, (4) EXTENDED EQUIPMENT LIFE, (5) DIAGNOSIS OF WEAK POINTS, AND (6) ADVANCE DETERMINATION OF EQUIPMENT REPLACEMENT. COST AND CONVENIENCE ARE DESCRIBED FOR AUTOMATIC CONTROLS. TYPES OF MAINTENANCE AGREEMENTS ARE PROVIDED BOTH FOR CONTROLS AND FOR MECHANICAL SYSTEMS. ADVANTAGES OF A HONEYWELL MAINTENANCE PROGRAM ARE LISTED, INCLUDING--(1) THE BUDGETING OF ALL MAINTENANCE FOR THE YEAR, (2) REDUCTION OF BREAKDOWNS AND EMERGENCY SERVICE, (3) PARTS AND REPLACEMENTS KEPT IN STOCK, (4) AVAILABILITY OF TRAINED SPECIALISTS, (5) TOOLS, TEST EQUIPMENT, AND OTHER SUPPLIES OTHERWISE KEPT IN INVENTORY, AND (6) THE KEEPING OF COMPLETE RECORDS ON EQUIPMENT. (MM)