Podcast
Questions and Answers
The resistance wire used in electric heating elements is usually _____________?
The resistance wire used in electric heating elements is usually _____________?
Nickel Chromium
Radiant heat is transferred by _________?
Radiant heat is transferred by _________?
Infrared Rays
Quartz and glass panel electric units are classified as _______?
Quartz and glass panel electric units are classified as _______?
Radiant Heaters
The benefits of electric baseboard heating include which of the following?
The benefits of electric baseboard heating include which of the following?
Electric baseboard heaters are classified as ________?
Electric baseboard heaters are classified as ________?
Any unit heater designed to have air forced across the element should not be operated without the __________ operating?
Any unit heater designed to have air forced across the element should not be operated without the __________ operating?
An electric heating unit that utilizes ductwork to distribute the heated air is classified as a _________?
An electric heating unit that utilizes ductwork to distribute the heated air is classified as a _________?
The limit switch is used on the electric element assembly to _______?
The limit switch is used on the electric element assembly to _______?
Define Limit Switch
Define Limit Switch
Which of the following elements is not a power-consuming device?
Which of the following elements is not a power-consuming device?
A 10 Kw heating element, operating on rated 240 V, will generate ________ Btu/h?
A 10 Kw heating element, operating on rated 240 V, will generate ________ Btu/h?
Generally speaking, electric heat is very efficient but can be more expensive to operate compared to oil and gas.
Generally speaking, electric heat is very efficient but can be more expensive to operate compared to oil and gas.
Some units may be designed to move enough air across the heating elements so that they do not glow.
Some units may be designed to move enough air across the heating elements so that they do not glow.
Electric heating units provide almost instant heat; therefore, anticipators are not needed in electric heat thermostats.
Electric heating units provide almost instant heat; therefore, anticipators are not needed in electric heat thermostats.
If the number two contact on a package sequencer fails to close, the number three contact can still close.
If the number two contact on a package sequencer fails to close, the number three contact can still close.
All electric furnaces use package sequencers.
All electric furnaces use package sequencers.
If the fan was to fail and the limit switch stuck closed, the element would be cut off by the ________?
If the fan was to fail and the limit switch stuck closed, the element would be cut off by the ________?
In order to prevent a duct-mounted electric heater from being energized when the fan is not on, a ________ should be used.
In order to prevent a duct-mounted electric heater from being energized when the fan is not on, a ________ should be used.
A set of contacts actuated by a bimetal strip with a low-voltage wire wrapped around it is called a(n) ___________
A set of contacts actuated by a bimetal strip with a low-voltage wire wrapped around it is called a(n) ___________
In order to provide time delay between stages of electric heat, the controls that are used are called _________?
In order to provide time delay between stages of electric heat, the controls that are used are called _________?
Radiant electric heating panels used for ceiling installation are made of a __________________ with wire heating circuits running throughout?
Radiant electric heating panels used for ceiling installation are made of a __________________ with wire heating circuits running throughout?
For each watt of electrical power, __________ Btu/h are generated.
For each watt of electrical power, __________ Btu/h are generated.
Where in a room are electric baseboard heaters normally placed?
Where in a room are electric baseboard heaters normally placed?
How should you determine the heat anticipator setting on a room thermostat?
How should you determine the heat anticipator setting on a room thermostat?
Why do most electric furnaces have several heating elements that are activated in stages?
Why do most electric furnaces have several heating elements that are activated in stages?
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Study Notes
Electric Heating Components
- Resistance wire in electric heating elements is typically made of Nickel Chromium.
- Radiant heat is transferred through infrared rays.
- Quartz and glass panel units are classified as radiant heaters.
Electric Baseboard Heaters
- Electric baseboard heaters are inexpensive to install and operate on a 24-V power supply.
- Classified as natural-convection heaters, they utilize convective heat transfer.
- Usually positioned on walls above the floor or carpet for optimal heat distribution.
Heating Units and Systems
- Any unit heater with air forced across the heating element should include an operational fan.
- Electric heating units using ductwork are categorized as forced-convection heaters.
- Limit switches in electric element assemblies shut off units when high temperatures are detected.
Safety and Functionality
- A limit switch prevents equipment damage by stopping operation during excessive heat or high amperage situations.
- If a fan fails and the limit switch is stuck closed, a fusible link provides an additional safety cut-off.
Performance and Efficiency
- A 10 kW heating element at 240 V generates approximately 34,130 Btu/h.
- Electric heating is efficient but can be costlier compared to oil and gas due to high electrical energy requirements.
- Some electric heating units can move enough air to prevent glowing of heating elements.
Thermostat and Controls
- Electric heating units provide instant heat, eliminating the need for anticipators in thermostats.
- Sequencers control the timing between stages of electric heat activation to manage load.
- Heat anticipator settings on thermostats are determined by the total current draw in the 24-V heating circuit.
Additional Features
- Radiant electric heating panels suitable for ceiling installation consist of gypsum board with wire heating circuits embedded.
- Each watt of electrical power generates approximately 3.413 Btu/h of heat.
- Failure of contacts in package sequencers may not prevent other contacts from closing, assisting in maintaining functionality.
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