G2 Gas Technician Module 17 Revised || with Complete Solutions.

What are the factors governing a conversion? correct answers Availability of gas, efficiency if converted, access to combustible air, satisfactory ductwork, can a chimney liner be installed, clearances from combustibles, manufactures recommendations, if a water heater is also being installed (common vent or power vent), and age of the appliance Oil fired furnaces are recommended not to be converted at a certain age what is age is this? correct answers 10 years clause 4.3.5 What are the responsibilities of the installer when converting? correct answers Determine that it can accept gas and will operate satisfactory for a reasonable length of time. What must be done when converting a boiler? correct answers 1. Check for revirtible flue; center line must be at leas 12" above burner port 2. Visually inspect for leaks 3. Open drain at bottom and flush until water is clear 4. Sediment can hide a leak at the bottom Where must a pressure relief drop tube be located on a boiler? correct answers The pressure relief tube must be withing 12" of the floor What must be done if a warm air furnace does not have a revertible flue? correct answers Center line of the flue collar is 12" above burner port and barometric draft regulator can be installed so relief opening is 12" above the highest flue passage. Can you convert a forced air furnace with a secondary heating surface on the suction side of the air blower? correct answers No. Unless the heating surface consists of a single cylinder flue pope passing directly from the primary heat exchange to the flue collar and has a continuously gas tight welded joint. How do you check a heat exchanger? correct answers 1. Smoke in fire chamber (plug the flue outlet) 2. Light and mirror, check for cracks 3. warping and distortion of heat exchanger 4. Rust Spots 5. Gaskets on joints. How do you determine the firing rate of a replacement burner? correct answers 1. Heat loss calculations of the building 2. Input or output on rating plate 3. Nozzle size in the burner