Table of Contents
- 1 Why is a visual check of the heating strips on an electric furnace difficult to accomplish?
- 2 What should a technician always check whenever a thermal limit or fusible?
- 3 What should a technician do if called to work on an oil burner with a tripped safety reset quizlet?
- 4 How do you set the anticipator on a thermostat?
- 5 How does an HVAC contactor work?
Why is a visual check of the heating strips on an electric furnace difficult to accomplish?
63-17) Why is a visual check of the heating strips on an electric furnace difficult to accomplish? The heaters must be removed from the furnace for inspection. The large current draw from the strip heaters turns even small resistances into heat that accelerates oxidation.
How should you determine the heat anticipator setting on a room thermostat using a package sequencer?
The heat anticipator setting is determined by A- Adding all the current draw in the 24-Volt circuit that passes through the thermostat control bulb and heat anticipator.
What should a technician always check whenever a thermal limit or fusible?
Whenever a thermal limit or fusible link needs replacing, the technician should always check? The air filter and airflow. What would happen if metal debris fell into the heating elements? The debris could cause the heating element to turn on.
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 should a technician do if called to work on an oil burner with a tripped safety reset quizlet?
What should a technician do if called to work on an oil burner with a tripped safety reset? Check the combustion chamber for unburned oil. What should be done if a furnace with a tripped primary control has oil is in the combustion chamber?
How does the anticipator work on a thermostat?
The purpose of a thermostat heat anticipator is to “de-sensitize” the thermostat so that when actual room temperature is hovering close to the set temperature on the thermostat, the thermostat switch won’t keep switching the air conditioner or heating system on and off too often – which can damage the equipment.
How do you set the anticipator on a thermostat?
Instructions
- Examine the Thermostat. Remove the thermostat cover.
- Locate the Heat Anticipator. Look for the small disc with calibration marks located at the center of the thermostat.
- Adjust the Heat Anticipator.
- Test the Thermostat.
When performing an operation check the technician should consult the?
One performing an operation check come on be sure to consult the. Routine maintenance, pre start inspection, operational checks., and troubleshooting.
How does an HVAC contactor work?
The contactor is essentially a type of switch that receives a low voltage signal (24V) from your furnace to power on. By creating a magnetic field, it pulls down a piece of metal that will connect both of the higher voltage sides. A single pole contains one magnetic coil that will connect one circuit.
How can a technician tell the difference between an upflow furnace and a downflow furnace?
First of all, your HVAC unit’s placement can give you a good idea of the airflow direction. Furnaces located in an attic or upper story are most likely downflow furnaces. When it’s located in the basement or crawlspace of the home, you likely have an upflow furnace.