Questions and Answers
The resistance wire used in electric heating elements is usually _____________?
Nickel Chromium
Radiant heat is transferred by _________?
Infrared Rays
Quartz and glass panel electric units are classified as _______?
Radiant Heaters
The benefits of electric baseboard heating include which of the following?
Signup and view all the answers
Electric baseboard heaters are classified as ________?
Signup and view all the answers
Any unit heater designed to have air forced across the element should not be operated without the __________ operating?
Signup and view all the answers
An electric heating unit that utilizes ductwork to distribute the heated air is classified as a _________?
Signup and view all the answers
The limit switch is used on the electric element assembly to _______?
Signup and view all the answers
Define Limit Switch
Signup and view all the answers
Which of the following elements is not a power-consuming device?
Signup and view all the answers
A 10 Kw heating element, operating on rated 240 V, will generate ________ Btu/h?
Signup and view all the answers
Generally speaking, electric heat is very efficient but can be more expensive to operate compared to oil and gas.
Signup and view all the answers
Some units may be designed to move enough air across the heating elements so that they do not glow.
Signup and view all the answers
Electric heating units provide almost instant heat; therefore, anticipators are not needed in electric heat thermostats.
Signup and view all the answers
If the number two contact on a package sequencer fails to close, the number three contact can still close.
Signup and view all the answers
All electric furnaces use package sequencers.
Signup and view all the answers
If the fan was to fail and the limit switch stuck closed, the element would be cut off by the ________?
Signup and view all the answers
In order to prevent a duct-mounted electric heater from being energized when the fan is not on, a ________ should be used.
Signup and view all the answers
A set of contacts actuated by a bimetal strip with a low-voltage wire wrapped around it is called a(n) ___________
Signup and view all the answers
In order to provide time delay between stages of electric heat, the controls that are used are called _________?
Signup and view all the answers
Radiant electric heating panels used for ceiling installation are made of a __________________ with wire heating circuits running throughout?
Signup and view all the answers
For each watt of electrical power, __________ Btu/h are generated.
Signup and view all the answers
Where in a room are electric baseboard heaters normally placed?
Signup and view all the answers
How should you determine the heat anticipator setting on a room thermostat?
Signup and view all the answers
Why do most electric furnaces have several heating elements that are activated in stages?
Signup and view all the answers
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.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
This quiz covers the essential components and classifications of electric heating systems, including resistance wire, radiant heaters, and baseboard units. It also addresses safety features like limit switches and the functionality of various heating units. Test your knowledge on effective heating techniques and technologies!
