Ch. 38
Forced-air means the equipment has this component in it.
what is a blower?
The type of ignition system that lights a pilot when the system is calling for heat?
what is intermittent pilot?
This opens a solenoid valve in the fuel line of an oil-burning furnace.
what is the primary control unit?
The conversion for 1 Kw to BTU's/hr
what is 3,413?
The thing you should check first when a system is running and then suddenly stops.
what is main power?
The type of furnace that is high efficiency, above 90% AFUE rating.
what is condensing?
the ultimate carbon dioxide content for natural gas is
what is 11.9%?
possible flame colors for a fuel oil furnace that is experiencing incomplete combustion.
what is dull orange or red?
heating elements that are most often formed into coils.
what is open wire?
A gas furnace lights the burners but they quickly shut-off. The tech should inspect the.
what is the flame sensor?
Types of measurements primarily used to control blower operation in furnaces.
what is time and temperature?
A category 1 furnace is.
What is negative-pressure, non-condensing?
Stack temperature is determined by doing this.
what is subtracting the temperature of the combustion air from the temperature of the flue gas?
An uninsulated heating element composed of flat strips
what is open ribbon?
Anytime a tech is working on an electric furnace, air handler or heat pump, prior to leaving they should confirm these two things.
what is the size of the circuit breaker and the wire supply power to the system?
The three heat transfer distribution methods for gas, oil, and electric heating systems.
What is forced-air, hydronic, and radiant?
Class B chimneys are.
what is double wall metal type?
Most oil furnaces require a chimney or flue draft of approximately.
what is -0.02 " WC?
An electric heating element enclosed in a heat- and corrosion-resistant steel tube
what is tubular cased wire?
A tech finds a breaker tripped on an electric heater. they determine one of the 3 possible heat strips has shorted itself out. The temporary repair they can make is.
what is remove the faulty heat strip from the circuit until a permanent repair can be made?
Name at least three different heat sources for forced-air systems.
what is electric heaters, gas exchanger, oil exchanger, or indoor coil of a heat pump?
an opening in the flue that helps keep constant pressure in the combustion chamber and prevents ambient air from reaching the furnace flame.
what is an air break?
Four individual test that are found within combustion test kit.
what is:
- a CO2 test
- a smoke test
- a stack temp test
- a draft test
The 3 major angles of a radiant heaters projection
what is 45, 60, or 90 degrees?
The first four steps in a furnaces start up sequence of operations.
what is:
- calls for heat
- safety check
- inducer motor turns on (closing the psi switch)
- ignitor becomes energized