Adjust machine or freezer speed and air intake in order to obtain desired consistency and amount of product. Monitor pressure gauges, ammeters, flowmeters, thermometers, or products, and adjust controls to maintain specified conditions, such as feed rate, product consistency, temperature, air pressure, and machine speed. Record temperatures, amounts of materials processed, and/or test results on report forms. Read dials and gauges on panel control boards in order to ascertain temperatures, alkalinities, and densities of mixtures, and turn valves in order to obtain specified mixtures. Correct machinery malfunctions by performing actions such as removing jams, and inform supervisors of malfunctions as necessary. Start machinery such as pumps, feeders, or conveyors, and turn valves in order to heat, admit, or transfer products, refrigerants, or mixes. Assemble equipment, and attach pipes, fittings, or valves, using hand tools. Scrape, dislodge, or break excess frost, ice, or frozen product from equipment in order to prevent accumulation, using hands and hand tools.