INSTALLATIONS FOR REFRIGERATION AND HEATING AND OTHER ENVIRONMENTAL CONTROL APPARATUS, NAMELY, REFRIGERATORS, AIR CONDITIONERS, MERCHANDISE DISPLAY COOLERS, UNIT COOLERS FOR USE IN FOOD AND BEVERAGE REFRIGERATION SYSTEMS, EVAPORATOR COILS, AIR-COOLED CONDENSERS, CONDENSING UNITS, FLUID COOLERS FOR USE IN FOOD AND BEVERAGE REFRIGERATION SYSTEMS, AIR HANDLERS, HEAT RECLAIM UNIT, DEFROST UNITS FOR USE IN FOOD AND BEVERAGE REFRIGERATION SYSTEMS, HEATING AND VENTILATING UNITS, AND COMPONENT PARTS THEREFOR, NAMELY COOLING COILS, HEATING COILS, VALVES, CONTROLS, THERMOSTATS, FANS, FAN GUARDS, TIMERS, MOTORS, FILTERS, DRAIN PANS, WIRING, AND REFRIGERANTS, AND GLASS FOR USE IN REFRIGERATED STORAGE UNITS