Physical Effort and Working Conditions: In performing the required work, it is required to have the ability to climb ladders and scaffolding, do a lot of walking, use every kind of hand tool, work in hazardous positions, carry heavy tools, (maximum 100 pounds), and knock holes in concrete may be subject to electrical shock, burns and injuries to the eye and lungs from refrigerant gases, quick variations of temperature, exposure to acids and fumes, falls, cuts and bruises from hand tools and by working in cramped quarters. Must have a thorough and advanced knowledge of every cycle and its components; such as electronic circuitry, high and low voltage electricity, pneumatic and electronic control systems that sense minute changes in temperature and humidity, dew points, air water and refrigerant pressures; air and water flow and overload protection, adjust temperatures, damper position, space changes, etc.