Nate Gas Furnace Service

What precautions, if any, must be taken when installing a gas furnace on a wooden platform in an attic? - Answer- Use a zero-clearance furnace or add a non-combustible base A vent connector should have a as few elbows and joints as possible to: - Answer- Reduce resistance of flue gases The gas control valve may be damaged if exposed to an inlet pressure above - Answer- 14in wc To which thermostat is leveling the most critical: - Answer- Mercury Bulb Which of the following is a reason for the thermostat to short cycle a gas furnace - Answer- A system that is oversized for the load When a thermocouple pilot flame is lost on a standing pilot gas furnace, the primary component which shuts off gas flow to the main burner is: - Answer- Pilot solenoid The most important consideration when working on a gas furnace with ribbon type insertion burners is - Answer- The individual burners must be mounted in correct alignment Primary air is mixed with the gas within the - Answer- Venturi or throat of the burner An intermittent pilot gas furnace is one in which a - Answer- Pilot is lit on every call for heat The pressure reading on a monometer is expressed in inches of - Answer- Water How mush of the end of the thermocouple should be enveloped by the pilot flame - Answer- 3/8 to ½ inch The LP gas manifold pressure is commonly - Answer- 10 to 11in wc A thermocouple system usually generates its own control circuit voltage of - Answer- 750mv On a single stage combination gas valve with a thermocouple flame proving circuit, the main bu