HVAC On Off Control Basics

The video tutorial explains how to control the heat output from an electrical heater manually and automatically using a bimetallic strip thermostat. It describes how the strip bends with temperature changes to control the circuit. The tutorial also covers on-off control systems for heating or cooling, highlighting their limitations in maintaining a stable temperature and suggesting improvements by using smaller time intervals.

What is one way to manually control the heat output from an electrical heater?

• Adjusting the room's insulation

• Switching it on or off manually

• Changing the heater's location

• Using a remote control

How does a bimetallic strip function as a thermostat?

• It changes color with temperature

• It bends to disconnect and reconnect the circuit

• It emits a sound when the temperature changes

• It vibrates to indicate temperature changes

What is the role of a manual switch in a thermostat system?

• To allow user override of the heating

• To increase the heater's power

• To change the heater's location

• To adjust the room's insulation

Why might a simple on-off control system not maintain a consistent room temperature?

• It causes the room to be alternately too hot and too cold

• It is too expensive to operate

• It requires frequent maintenance

• It uses too much energy

What is a suggested improvement for achieving a more even temperature in a room?

• Dividing the time intervals into smaller segments

• Using a more powerful thermostat

• Increasing the size of the heater

• Installing additional heaters