What would happen if the fan on an electric unit heater burned out? The fusible link would burn out. If an electric heater has three heating elements connected in parallel, why does each element have its own fusible link and limit switch?
Are electric heating elements position sensitive?
Electric heating elements are position-sensitive and should not be used if installed upside down. For direct radiant heat, the electric heating elements warm a large surface, such as a wall. Indirect radiant heat produces more room temperature variation than baseboard heating units.
Why are baseboard electric heaters placed on the outer walls of a room?
Why are baseboard electric heaters placed on the outer wall of a room? to offset heat loss. The outer walls of a room is where the most heat loss happens.
What is the resistance wire used in electric heating elements usually made of?
Such heating elements are used in electric ovens and water heaters, and in specialized forms for cooktops. Nichrome, a non-magnetic 80/20 alloy of nickel and chromium, is the most common resistance wire for heating purposes because it has a high resistivity and resistance to oxidation at high temperatures.
Why do most electric furnaces have several heating elements that are activated in stages?
Some units may be designed to move enough air across the heating elements so that they do not glow. … Why do most electric furnaces have several heating elements that are activated in stages? To prevent a high load coming on all at once.
What is the heating element must be high to ensure reliability?
Nichrome: Most resistance wire heating elements usually use nichrome 80/20 (80% Nickel, 20% Chromium) wire, ribbon, or strip. Nichrome 80/20 is an ideal material, because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time.
What is one important thing you must do when replacing a heating element rack?
What is one important thing you must do when replacing a heating element rack? Ensure that you specify the model and serial number of the furnace where the rack will go.
Do baseboard heaters have to be on exterior walls?
There is no rule that requires baseboard to be mounted anywhere.
Why are contactors used in residential?
Contactors are used in HVAC systems as a means to control the voltage applied to loads. They are an electrically controlled, remote switch, used to power up motors, compressors, and sometimes the electric strip heat in residential and light commercial systems.
What controls the heating elements in most electric furnaces?
All types of electric resistance heating are controlled with a thermostat. Baseboard heaters often use a line-voltage thermostat (the thermostat directly controls the power supplied to the heating device), while other devices use low-voltage thermostats (the thermostat uses a relay to turn the device on and off).