G2 Gas Technician Module 14 Revised Already Passed

G2 Gas Technician Module 14 Revised Already Passed What is a typical electrical connection for a gas range? 120 V 60 HZ, two-wire with a ground. What must a flex connector be connected to? What else must be there? Must be connected to rigid pipe with a shut off valve immediately upstream of the connector. What types of appliances must use a flexible metal connector? Appliances that vibrate, expand and contract or other movements that could damage a rigid connection. What is the maximum length of a flexible metal connector? 6 ft Types of gas ranges Free-standing, built-in and dual fuel Types of heat transfer Convection, conduction and radiation How does convection work? Transfer of heat is by heat currents. What are two different types of convection an oven uses. Natural convection (warm air rises and cool air descends) and Forced convection (heat produced by the burner is circulated evenly with a fan) How does conduction work? Transfer of heat through direct contact. Particle to particle How does radiant heating work? Heat rays emitted from a heat source. Localized heating. Two different types of Top burner ignitors. Standing pilot and Electric ignitor How does the Standing pilot work on a top burner ignitor? What are the variations of the # of pilots? A continuously lit pilot that once the control valve calls for gas it will ignite it. Can have one pilot for each burner, one pilot for two burners and one pilot for all four burners What does the flash tube do? Used in stand pilot systems, once control valve is opened gas flows down tube drawing in combustion air with it. It flows towards the pilot and ignites. A flashback occurs back up to tube consuming all the gas. It ignites the burner and gas no longer is in the tube. If the flash tube does not light the burner but has a standing pilot at the base of the tube what would cause this? To little air or to much gas. If a flash tube fails to light the burner what can be a cause? To much air in the mixture. How should a domestic clothes dryer be installed? On a solid level floor and must be level why it is operating. What kind of duct is acceptable to exhaust the dryer? Must be non-combustible, or certified as a class 1 air duct as per the CAN/ULC-S110 What is are some prohibited practice in venting a moisture duct? Do not connect to a vent connector, vent or chimney and do not use sheet metal screws to secure it. Use duct tape. What types of ducts would you use on a moisture exhaust duct? Rigid or flexible metal duct. Rigid is preferred as it is less likely to be crushed. What must be done if a duct travels through an unheated space? It should be insulated and sloped downward towards the exhaust hood. Name three types of Clothes dryer burner ignition systems. Constant pilot, glow-coil and glo-sil Glow coil system how does it work as an ignition system? The glow coil is a resistance wire mounted on a cermaic block connected to a step down transformer that is mounted on the valve body. When power is applied the coil glows producing enough heat to ignite the gas. What does a warp switch do? Acts as a safety device to break the circuit to the glow coil and pilot valve during a malfunction. Malfunctions that the warp switch sense. main burner doesnt light, pilot fails to light, and a faulty pilot flame. What ignition system uses a warp switch? Glow coil system. How many valves does a Glo-Sil burner have? It has two valves that both need to be open for the gas to flow. What temperature does a radiant sensor open? 2200 F If a three pronged cord has black white and green leads. What are they? Black is hot, white is neutral and green is ground How can you tell a hot and neutral in a moulded flat cord? The exterior of the cord will have a smooth side and a ribbed side. Smooth is hot and ribbed is neutral. How hot does a ignitor get in a glo-sil burner? 2200 F In a BBQ what would placing to many lava rock or briquettes cause? Premature burner burn-out What is a sign that the spider guard is blocked on the BBQ? A yellow and lazy cooking flame. What color does a mantle-equipped gas lamp burn? White hot and gives off light. What are the two ways you light a gas lamp? By an electrode that is manually operated with a switch or automatic with a photo sensor and manually using an open flame. How far should a dryer duct terminate from a service regulator? 3 ft clause - 7.5.2 What is the voltage on a glow coil system? 110 - 120 V What type of gas valve is used in a glow sil burner system? Redundant What is the purpose of the radiant sensor in a glow sil burner? To prove pilot. What is the max hose length you can use on a BBQ? 30 ft What is the maximum allowable clearance to combustibles for a range certified for zero clearance? 0" clause - 4.13.2 What is the purpose of the appliance regulator? To reduce working pressure down to manifold pressure Why must there be gas flow to properly read working pressure? If there is none you are reading static pressure. A dryer motor switches from start mode to a run mode using what switch? Centrifugal switch What are the allowable clearances to combustibles for a residential gas dryer? 6" If the dryer fires but the drum doesn't turn, what could be the problem? Broken belt or seized drum What would cause the gas dryer to keep running after it's door is opened? Broken door switch Where can specific information about a gas dryer be located? In the manufactures guidelines and the rating plate What type of diagram is used to determine sequence of operation? Ladder or schematic diagram What is the minimum size and type of wire that can be used for a 120 V, 15 A indoor range? 14 gauge NMD Where would you find the clearances for a clothes dryer? Rating plate or B149.1 Is a drip/dirt pocket required on the fuel supply on a residential gas dryer? No clause 6.13.1.c) If you convert a gas lamp what must you do? Change orifice, change air ratio, and note changes on rating plate If you have flame flashback beneath the control panel on aBBQ, what is the cause? Blocked venturi tube What are two causes of a yellow flame for a gas lamp with a mantle? Broken mantle, not enough air Where is the shut off installed on the corrugated metal connector? Immediately up stream Where must you vent a moisture exhaust duct? Outdoors