Gas Heat #1
The most common furnace configurations are
downflow, upflow, horizontal, and multipoise
. In an intermittent pilot (IP) ignition system
the pilot is lit electronically each time there is a call for heat
Which of the following would cause a problem with the flame rectification circuit
A poor ground wire connection
The voltage provided by a solid-state igniter typically ranges from
14,000 V to 20,000 V
Which of the following is true regarding preventive maintenance on oil-fired heating equipment?
Oil-fired heating systems typically require more preventive maintenance than other types of heating appliances
A tool, which measures in inches of water column, that can be used to test gas pressure is a
digital manometer
The component on which the spuds and burners are mounted to is the
manifold
Incomplete combustion produces which of the following toxic substances?
Soot
Which of the following statements is true regarding the cad cell?
The resistance of a cad cell decreases when it senses light
A control’s response to a specific number of unsuccessful trials for ignition is a(n)
lockout
The pressure at the manifold for natural gas is typically
3.5 in. WC
The component that contains and separates the flue gas from the medium being heated is the
heat exchanger
The principal of flame rectification is based on the fact that
a flame can conduct electricity
Condensing furnaces are vented with piping made from
PVC (i.e. Plastic )
In a two-stage furnace, the typical manifold pressure in low-fire is
1.75 in. WC
The three things needed for combustion are
fuel, air, and heat
The component that consists of several thermocouples wired in series to increase voltage output is the
thermopile
Before fuel oil can burn it must be
atomized
Which of the following is true regarding condensing furnaces?
Condensing furnaces have multiple heat exchangers.
The horizontal run of the flue pipe on a gas-burning furnace should be sloped
¼ in. rise per foot
The pressure at the manifold for LP is typically
10.5 to 11 in. WC.
To test the flame rectification circuit, a digital multimeter should be placed
in series with the flame sensor to test microamps
The motor on an oil burner is responsible for turning the
burner fan and the fuel pump
Which of the following is the correct formula for calculating net stack temperature?
Net Stack Temperature = Flue Temperature - Indoor Ambient Air Temperature
A thermopile typically generates
500 to 750 DC millivolts