G2 Gas Technician Module 23 Revised with Verified Answers

G2 Gas Technician Module 23 Revised with Verified Answers Why are air cleaners installed ahead of heating or cooling coils and air conditioners? To protect the equipment from dust and increase efficiency What are two ways in which a mechanical filter could restrict air flow? Dirty Air Filter and Incorrect Air Filter Name three types of air cleaners that can be used with a forced-air furnace? Media, electrostatic, and electronic Which type of air cleaner is usually the least expensive? Media/Mechanical Which type of air cleaner is usually the most expensive? Electronic (EAC) Name two advantages of an electronic air cleaner? Highly Efficiency and Collects Particles Do electronic air cleaners remove smoke odours from the conditioned air? No How can smoke odours be reduced? Activated Carbon Filter/ Coal Filter What must the gas technician do before installing any air cleaner? Comply with Manufacturers Instructions If there are arrows on a filter frame, which way must they face? Same way as the systems air flow Why must be done before opening the blower door on a forced-air furnace? Disconnect Power How frequently should furnace filter be inspected in the heating season? Every Month How frequently should filters be replaced? Whenever they need to be. Why can disposable filters not be re-used? Removal of mineral oils will cause the filter to not operate Name three problems that can result from operating a forced-air furnace without a filter? Dust and lint buildup, Inefficiency and Fire What is the most common cause of inadequate heating or cooling performance? Dirty Air Filter What damage can a dirty filter do in a system that includes add-on air conditioning? Inadequate Air Flow and floodback How can clean filters save the customer money? Preventing equipment damage What are the four components of an electronic air cleaner? Pre Filter, Charging Section, Collecting Section, and Power Pack What can happen if ionizer wires are broken on an electronic air filter? Arcing and Sparking What can happen if the electronic air filter is turned on when cells are wet? Electrical Shock If cells are washed in a dishwasher, why should the drying cycle not be run? It will bake on the contaminants and impair air cleaners efficiency Name three factors that may be present in a home that would suggest cleaning must be more frequent? Pets, smoking, and woodworking Describe the basic function of an electronic air cleaner. Particles are energized by ionizing wire and given a positive or negative charge that collects particles If the power pack is not working, what should be done? Replace it List three methods for cleaning the cells of an electronic air cleaner? Power wash, automatic dishwasher, and detergent Why should atomizing humidifiers operate only when the furnace blower is operating? Moisture can accumulate causing corrosion and mildew What three problems may be caused by relative humidity that is too low? Temperature feels colder than it's actual temperature, static increases, frequent virus, and sickness What is the approximate level of relative humidity for optimum comfort in a residence? 40% What is the major difference between atomizing humidifiers and other types of humidifiers? It introduces small droplets of water directly into the duct air stream or the conditioned space If excessive dust in a building is coming from the humidifier, how can it be identified? The dust will be white Name two common problems that can result from water overflow from a humidifier? Mildew and Corrosion What device controls the operation of a humidifier? Humidistat If a humidifier is used in a system with an electronic air cleaner, where should the humidifier be mounted? Downstream of the EAC Why would a cooling coil be added to a forced air furnace? Adapts it for the use as a central air conditioner List four problems that might develop in a central furnace if the cooling coil is not kept clean? Clogged or dirty fins, oil leak and clogged drip tray If there are no viewing ports allowing the technician to view the coil, what must be done? Cut an inspection port Why should static pressure across the coil be measured? If the pressure drop is to great the coils need to be cleaned Where should the test holes for measuring static pressure be drilled? The cooling coil cabinet What devices are used to measure pressure drop across the coil? Manometer What does an oil leak from the coil indicate? A leak that must be repaired How can the external surfaces of a coil be cleaned? Brushed, Vacuumed, and Low pressure water