NATE Gas Heat Practice Guide- Questions with Answers

What precautions are required when mounting any gas furnace on a wood platform in an attic? None The gas control valve may be damaged if exposed to an inlet pressure above what? 14 inch W.C. How many elbows and joints should a vent connector have? As few as possible to reduce resistance of flue gases. Under what conditions, if any may the technician route the exhaust of the furnace into the exhaust vent of the water heater: Under no conditions may you use the water heater exhaust vent. How may a technician terminate the intake and exhaust for proper operation of a high efficiency gas furnace when using scheduled 40 PVC pipe: By using the specific manufacturers termination kit or make one to meet their requirements. When suspended with metal strap and no saddle, flexible duct should be: supported with a minimum strap width of 1/2". A technician is installing a gas furnace and the customer has decided not to install an air conditioner. Making this decision, the affect it will have on the installation of the supply ductwork is: Leave adequate space should be allowed for addition of a coil in the future when feasible. Leveling of a Mercury bulb is __________ Critical Spray-type atomizing humidifiers are installed to do what? Discharge moisture into the supply duct. Electronic air cleaners (EAC) installed in a gas furnace system should be wired so they: Only operate any time the EAC On-Off switch is turned to ON. The LP gas manifold pressure is commonly what? 10 to 11 in. W.C. The polarity of a 120V gas furnace equipped with electronic flame rectification is important because: The ignition control may not prove flame.