Heating Controls
________ are often controlled by individual thermostats.
Electric radiant heating elements
Baseboard heaters transfer heat by
convection
Ceiling-mounted radiant heating panels are typically constructed of
gypsum board
A disadvantage of a central forced-air electric furnace is that
there is no zone control for individual rooms.
The material often used to manufacture electric strip heater element wire is
nickel chromium (nichrome).
An isolating thermostat subbase is easily identified because it has which of the following terminals?
RH and RC
The fusible link is best described as a(n)
one-time safety device.
If the thermostat is calling for heat, but the appliance is providing insufficient heat, which of the following is the most likely cause for system malfunction?
The supply voltage to the appliance is too low.
On furnaces that are equipped with belt-driven blower assemblies, which of the following can result if the belt is too loose?
Reduced airflow and increased internal appliance temperature
Three common controls used in central electric heat applications are
thermostats, contactors, and sequencers.
If a fusible link is found to be defective, which other system component must be replaced as well?
The limit control
The sequencer is responsible for
staggering the starting and stopping of multiple stages of electric heat.
What is the approximate efficiency of an electric furnace with respect to its ability to convert electrical energy to heat energy?
100%
Electric baseboard heaters are typically controlled by
heater-mounted line-voltage thermostats.
If the proper voltage is supplied to an electric heating element and it does not get hot,
the heating element is defective.
What is the purpose of an interlock circuit on an electric forced-air furnace?
It prevents the heaters from coming on if the blower is not energized.
The wiring diagram that shows the location of each system component is the
pictorial diagram.
From an installation standpoint, electric boilers have the benefit of not requiring
flue or vent piping.
The electric resistance strip heaters in an electric furnace are insulated from the rest of the appliance using which materials?
Mica or ceramic
What is the difference between resistance heating and heat pump heating?
The low-voltage thermostat is often used to control an electric heating system because it is compact, quick to respond to load changes, and it
is safe.
The heat anticipator is a(n)
adjustable device that is wired in series with the thermostat’s heating contacts.
Portable or small space heaters with glowing coils transfer heat by
radiation
Dirty air filters on an electric forced-air furnace can cause
reduced airflow and increased internal appliance temperature.
TWO PART QUESTION WORTH DOUBLE!
A) What is the formula for calculating electrical power?
B) How many watts does a 240-volt heater draw if it uses 20 amps?
A) P = V × I (Power = Voltage × Current)
B) P = 240 × 20 = 4,800 watts