G2 Gas Technician Module 21 Revised Questions with Verified Solutions

G2 Gas Technician Module 21 Revised Questions with Verified Solutions What type of vent is used on a wall furnace? BW Venting What temperature does a low-intensity infrared heater fire at? where are they used? 1200 F and are used in factories and commercial buildings How does a low intensity infrared heater work? Gas burner fires into mouth of tube and hot flue gases travel through tube. It emits infrared heat which is directed by reflector suspended above the tube. What are high intensity infrared heaters made of? Porous ceramic, drilled port cermaics, stainless steel or a metallic screen. What temp does a high intensity infrared heater operate at? 1800 F What is the max length of a metal connector supplying gas to a suspended infrared heater? 2 ft Mainenance of a high intensity infrared heater. Cleaning the tile? The burner head? Reflectors? Clean ceramic tile with compressed air, avoid directing at gasket material between tile and heater body and do not exceed 20 psi. Clean the burner head with compressed air not exceeding 60 psi. Blow through venturi towards atmosphere then blow back the other direction but avoid forcing dust back through venturi by directing air flow. Clean reflectors with a soft cloth and mild soap solution. Improper pressure entering the venturi tube causing flashback what should be done? Check burner gas pressure. A broken or cracked ceramic tile is causing flash back what must be done? Replace cracked or broken ceramic tile Flash back is occurring due to improper sealing of ceramic tile to burner body caused by breakdown of gasket material Contact the heater distributor Where can you never use a construction heater? Inhabited homes, inhabited parts of a building or in a recreational vehicle Construction heaters are allowed for permanent heating. No they are designed for temporary heating What are the three types of burners in a decorative appliance? Tube burner, Box burner and Ceramic Tile burner How does a decorative fire place work? Ceramic logs placed over a bar-type burner gives the illusion of an open fire. Where are fireplace inserts designed for? They are designed to fit into an existing masonry or factory-built fireplace Is a decorative appliance approved for installation in a bedroom? Yes, if it is direct vented. clause - 7.25.4 When installing a gas log set into an existing fireplace what must be done? Permanently secure the damper into the open position. clause 7.25.5 What type of heat transfer is typical with a wall furnace? (recessed heater) Convection How far shall a swimming pool heater be installed from the property line? 18" clause - 7.26.3 Where cant you install an unvented infrared heater? Residential, care or detention facilities. clause 7.23.1(c) A room heater installed in either in a room with sleeping accommodations are provided or in a public area shall Have a 100% safety shut off control Unvented type infrared heaters that have mechanical ventilation shall maintain a cabon dioxied level which is less than? 5000 ppm When a construction heater is in full operation what must it have? Adequate air supply BW vent shall only be used with a? Recessed wall furnace Decorative appliances installed in a room shall be? Direct Vent Three causes of flashback on a high intensity infrared heater? Low gas pressure, plugged burner tiles and faulty tile gasket What type of flame are decorative appliance designed to make? Luminous flames